Co-reporter:Bo-Tao Zhang, Jun Liu, Shizhong Yue, Yanguo Teng, Zhijie Wang, Xiaobao Li, Shengchun Qu, Zhanguo Wang
Applied Catalysis B: Environmental 2017 Volume 219(Volume 219) pp:
Publication Date(Web):15 December 2017
DOI:10.1016/j.apcatb.2017.07.033
•LaCoO3 is demonstrated to be a typical p-type semiconductor for hydrogen generation from solar water splitting.•For the LaCoO3/Au nano-composite, hot electrons generated in plasmonic metals are preferential to inject into the photo-catalyst to initiate the photo-electrochemical reactions, rather than staying on the metal surface for the reactions.•The well-known thermal-stimulus for driving chemical transformations is not observed to be influential.In order to acquire an efficient photo-catalyst for generating hydrogen directly on the material, herein, we introduce the well-known catalyst, LaCoO3, to the community of water splitting using solar energy. By combining with Au nanoparticles, we find that hot electrons injected from Au nanoparticles to LaCoO3 are responsible for amplifying the photo-catalytic efficiency and the well-known thermal-stimulus for driving chemical transformations is not observed to be influential. Such charging process to the catalysts is crucial for promoting the subsequent catalytic reactions. Thus, this paper provides insights into the working mechanism of plasmonic based photo-catalyst.Download high-res image (114KB)Download full-size image
Co-reporter:Shudi Lu, Jie Lin, Kong Liu, Shizhong Yue, ... Zhanguo Wang
Acta Materialia 2017 Volume 130(Volume 130) pp:
Publication Date(Web):15 May 2017
DOI:10.1016/j.actamat.2017.03.050
To take a full advantage of polymer semiconductors on realization of large-area flexible photovoltaic devices, herein, we fabricate polymer solar cells on the basis of polyethylene terephthalate (PET) with imprinted Ag grid as transparent electrode. The key fabrication procedure is the adoption of a modified PEDOT:PSS (PH1000) solution for spin-coating the buffer layer to form a compact contact with the substrate. In comparison with the devices with intrinsic PEDOT:PSS buffer layer, the advanced devices present a much higher efficiency of 6.51%, even in a large device area of 2.25 cm2. Subsequent characterizations reveal that such devices show an impressive performance stability as the bending angle is enlarged to 180° and bending time is up to 1000 cycles. Not only providing a general methodology to construct high efficient and flexible polymer solar cells, this paper also involves deep insights on device working mechanism in bending conditions.Download high-res image (199KB)Download full-size image
Co-reporter:Shizhong Yue;Kong Liu;Rui Xu;Meicheng Li;Muhammad Azam;Kuankuan Ren;Jun Liu;Yang Sun;Zhijie Wang;Dawei Cao;Xiaohong Yan;Yong Lei;Zhanguo Wang
Energy & Environmental Science (2008-Present) 2017 vol. 10(Issue 12) pp:2570-2578
Publication Date(Web):2017/12/06
DOI:10.1039/C7EE02685D
Efficient extraction of photogenerated charge carriers is of significance for acquiring a high efficiency for perovskite solar cells. In this paper, a systematic strategy for effectively engineering the charge extraction in inverted structured perovskite solar cells based on methylammonium lead halide perovskite (CH3NH3PbI3−xClx) is presented. Intentionally doping the chlorine element into the perovskite structure is helpful for obtaining a high open circuit voltage. The engineering is carried out by modifying the aluminium cathode with zirconium acetylacetonate, doping the hole transport layer of nickel oxide (NiOx) with copper and using an advanced fluorine doped tin oxide (FTO) substrate. This improves the bandgap alignment of the whole device, and thus, is of great benefit for extracting the charge carriers by promoting the transport rate and reducing the trap states. Consequently, an optimized power conversion efficiency of 20.5% is realized. Insights into how to extract charge carriers efficiently with a minimum energy loss are discussed.
Co-reporter:Dan Chi;Shihua Huang;Shizhong Yue;Kong Liu;Shudi Lu;Zhijie Wang;Zhanguo Wang
RSC Advances (2011-Present) 2017 vol. 7(Issue 24) pp:14694-14700
Publication Date(Web):2017/03/03
DOI:10.1039/C6RA27543E
To overcome the limits of low charge transport efficiency and high absorption in the UV region of conventional thick ZnO layers in organic solar cells, herein we introduce an ultra-thin ZnO film (4 nm) into PBDTTT-CF:PC70BM bulk heterojunction organic solar cells, as the electron transport layer, and realize a power conversion efficiency of 7.51%, which is dramatically higher than that of a device using general ZnO film (28.1 nm). Various techniques from both steady-state and ultra-fast views reveal that the devices with an ultra-thin ZnO film (less than 10 nm) show a higher built-in potential compared to the device with a 28.1 nm ZnO film. Such an enhancement of the built-in potential could facilitate the photo-generated excitons dissociating into free charge carriers and benefit the transport of charge carriers to the electrode. Thus, we have supplied an efficient electron conducting layer not only for the photovoltaic community but also for other photoelectronic devices.
Co-reporter:Kuankuan Ren;Le Huang;Shizhong Yue;Shudi Lu;Kong Liu;Muhammad Azam;Zhijie Wang;Zhongming Wei;Zhanguo Wang
Journal of Materials Chemistry C 2017 vol. 5(Issue 10) pp:2504-2508
Publication Date(Web):2017/03/09
DOI:10.1039/C6TC05165K
Though power conversion efficiencies of perovskite solar cells of over 21% have been reported, the degradation of the performance of these cells in the presence of moisture still inhibits the commercialization of these otherwise promising devices. Herein, we decided to utilize the moisture sensitivity of perovskite materials and fabricate a moisture detector based on high-quality CH3NH3PbI3−xClx nanosheet arrays. The resulting devices present a high sensitivity towards humidity with device resistance significantly dropping from 1.28 × 108 Ω at 30% relative humidity (RH) to 7.39 × 104 Ω at 90% RH and a response even faster than that of the commercial psychrometer. This response was even steeper than those of commercial psychrometers. Moreover, our device showed good reversibility and impressive specificity. Thus, the humidity sensitivity of perovskites, while disadvantageous for solar cell applications, was found to be quite applicable in a new field.
Co-reporter:Shengfei Shen, Hongli Gao, Yuan Deng, Yao Wang, Shengchun Qu
Applied Surface Science 2016 Volume 361() pp:95-101
Publication Date(Web):15 January 2016
DOI:10.1016/j.apsusc.2015.11.164
Highlights
- •
The Bi0.5Sb1.5Te3/ZnO core–shells prepared by combining a facile hydrothermal growth and magnetron sputtering approach.
- •
The light absorption and photoluminescence emission of the ZnO and the Bi0.5Sb1.5Te3/ZnO core–shells are investigated.
- •
The core–shell structure reveals a simultaneous novelty enhancement of the photoluminescence emission in the UV and visible range.
- •
The mechanism for the PL simultaneous enhancement is described.
Co-reporter:Yanpei Li, Kong Liu, Shudi Lu, Shizhong Yue, Dan Chi, Zhijie Wang, Shengchun Qu and Zhanguo Wang
Nanoscale 2015 vol. 7(Issue 41) pp:17283-17288
Publication Date(Web):24 Sep 2015
DOI:10.1039/C5NR04340A
Herein, using the light emitting component as the inner shell, we construct an advanced quantum-dot-quantum-well structure, ZnCdS/CdSe/CdZnSeS/ZnS, and use it for the fabrication of a light-emitting-diode. In comparison with the device containing conventional structured quantum dots, CdSe/CdZnSeS/ZnS, the advanced device possesses a superior performance in aspects of luminance, current efficiency, turn-on voltage and emitting wavelength tunability. Therefore, this paper indicates a promising strategy for the fabrication of light emitting devices based on quantum materials.
Co-reporter:Dan Chi, Shudi Lu, Rui Xu, Kong Liu, Dawei Cao, Liaoyong Wen, Yan Mi, Zhijie Wang, Yong Lei, Shengchun Qu and Zhanguo Wang
Nanoscale 2015 vol. 7(Issue 37) pp:15251-15257
Publication Date(Web):19 Aug 2015
DOI:10.1039/C5NR04069H
Herein, we constructed inverted PBDTTT-CF:PC70BM bulk-heterojunction organic solar cells by introducing Au nanoparticles to a ZnO buffer layer and a great improvement in energy conversion efficiency has been realized. To discover the positive roles of such plasmonic nanoparticles in the process of solar energy conversion, photovoltaic devices with the same architecture but different sized Au nanoparticles were purposely fabricated and it has been observed that the overall efficiency can be remarkably improved from 6.67% to 7.86% by embedding 41 nm Au nanoparticles in the buffer layer. The devices with other sizes of Au nanoparticles show a relatively low performance. Subsequent investigations including finite difference time domain simulation and transient photoluminescence studies reveal that the existence of the plasmonic particles could not only improve the optical absorption and facilitate the exciton separation, but can also benefit the collection of charge carriers. Thus, this paper provides a comprehensive perspective on the roles of plasmonic particles in organic solar cells and insights into the photo energy conversion process in the plasmonic surroundings.
Co-reporter:Ke-Fan Wang;Pingan Liu;Yuanxu Wang
Journal of Materials Science 2015 Volume 50( Issue 9) pp:3391-3398
Publication Date(Web):2015 May
DOI:10.1007/s10853-015-8895-2
When elemental sulfur was used to hyperdope crystalline silicon to a supersaturated density of ~1020 cm−3, it was found to enhance the sub-bandgap light absorptance of the silicon substrate from 0 up to 70 % when combined with the antireflection properties of the surface dome structures that were formed by surface texturing. These textured sulfur-hyperdoped silicon samples were then thermally annealed at various temperatures, and the effects of the annealing on each sample’s optical and electrical properties were investigated. In the silicon sub-bandgap wavelength range, the absorptance of the textured hyperdoped silicon was attenuated more slowly than that of a non-textured sample, and the modulation of its reflectance and transmittance properties was attributed to the density damping of the optically absorbing state. In addition, the optically absorbing state can release more electrons than the optically non-absorbing state, and the former state also has a stronger ability to scatter electrons than the latter.
Co-reporter:Kong Liu, Yu Bi, Shengchun Qu, Furui Tan, Dan Chi, Shudi Lu, Yanpei Li, Yanlei Kou and Zhanguo Wang
Nanoscale 2014 vol. 6(Issue 11) pp:6180-6186
Publication Date(Web):11 Apr 2014
DOI:10.1039/C4NR00030G
A hybrid plasmonic polymer solar cell, in which plasmonic metallic nanostructures (such as Ag, Au, and Pt nanoparticles) are embedded in the active layer, has been under intense scrutiny recently because it provides a promising new approach to enhance the efficiency of the device. We propose a brand new hybrid plasmonic nanostructure, which combines a plasmonic metallic nanostructure and one-dimensional semiconductor nanocrystals, to enhance the photocurrent of the device through a strong localized electric field and an enhanced charge transport channel. We demonstrate that when Ag nanoparticle decorated TiO2 nanorods were introduced into the active layer of polymer-fullerene based bulk heterojunction solar cells, the photocurrent significantly increased to 14.15 mA cm−2 from 6.51 mA cm−2 without a decrease in the open voltage; thus, the energy conversion efficiency was dramatically enhanced to 4.87% from 2.57%.
Co-reporter:Furui Tan, Shengchun Qu, Ping Yu, Fumin Li, Chong Chen, Weifeng Zhang, Zhanguo Wang
Solar Energy Materials and Solar Cells 2014 Volume 120(Part A) pp:231-237
Publication Date(Web):January 2014
DOI:10.1016/j.solmat.2013.09.008
•Hybrid bulk-heterojunction (HBH) concept is adopted to fabricate all inorganic solar cells.•Nanotetrapod shaped CdTe and CdSe quantum dot are used to form interpenetrated networks.•Performance of HBH solar cells depends largely on the mass ratio of the two phases.•HBH-structured solar cell performs better than the device with a planar-structured heterojunction.Hybrid bulk-heterojunction (HBH) nanostructure enables high excitons splitting efficiency by virtue of increasing contact area in the active layer. In this work, we have demonstrated a HBH solar cell based on all inorganic p-type and n-type nanoparticles. In order to facilitate charge transportation and collection after efficient excitons splitting, nanotetrapod shaped CdTe is used as p-type semiconductor and CdSe quantum dot as n-type material. The operation mechanism of HBH solar cells is demonstrated to be a donor–acceptor (D–A) model based on splitting of excitons. Besides the morphology and absorption characterization, photoluminescence quenching behavior is researched to show the excitons splitting process. Solar cells with HBH structure show promising photovoltaic performance, which benefits from the percolated donor–acceptor networks in the hybrid film. Our preliminary research shed light on the new development of solution based nanoparticles thin film solar cells.
Co-reporter:Dan Chi, Chao Liu, Shengchun Qu, Zhi-Guo Zhang, Yongjun Li, Yuliang Li, Jizheng Wang, Zhanguo Wang
Synthetic Metals 2013 Volume 181() pp:117-122
Publication Date(Web):1 October 2013
DOI:10.1016/j.synthmet.2013.08.019
•Methyl 4-[6,6]-C61-benzoate (MCB) is a good n-type material as the alternative of PCBM.•We study the effect of annealing temperature on P3HT and MCB devices.•The ideality factor and the reverse saturation current density are used to explain the device performance variation.A new type of fullerene acceptor, methyl 4-[6,6]-C61-benzoate (MCB), was used to fabricate bulk heterojunction solar cells in combination with poly(3-hexylthiopene) (P3HT) as donor. To optimization of device performance, the effect of annealing temperature was investigated in the range of 80–180 °C. And the highest power conversion efficiency (PCE) of 3.49% was achieved after baking the device at 110 °C for 10 min. This optimization condition was associated with the surface morphology of blend films as investigated by atomic force microscope and optical microscope. The device parameters were also analyzed by the relationship among the open circuit voltage, the short circuit current density, the reverse saturation current density and the ideality factor. Moreover, the devices were stable and the PCE showed about 90% durability even after 72 days.
Co-reporter:Kong Liu, Shengchun Qu, Furui Tan, Yu Bi, Shudi Lu, Zhanguo wang
Materials Letters 2013 Volume 101() pp:96-98
Publication Date(Web):15 June 2013
DOI:10.1016/j.matlet.2013.03.086
•We fabricate well-aligned silicon nanowires by metal-assisted chemical etching.•Ordered hexagonal structure of gold mesh is copied from anodized aluminum oxide.•The diameter of silicon nanowires corresponds to hole size of Au mesh.•The length of silicon nanowires is controlled by adjusting etching duration.•Single crystalline silicon nanowires grow along the [100] crystal direction.We reported a metal-assisted chemical etching approach to manufacture well-aligned silicon nanowires (SiNWs). Highly ordered gold (Au) mesh was achieved via vacuum evaporation on anodized aluminum oxide (AAO). It was revealed that the diameter and length of SiNWs could be controlled by adjusting the size of holes in Au mesh and etching duration, respectively. We found that the SiNWs fabricated by etching for 5 min were vertically oriented to form an array, while longer etching duration led to bunched SiNWs. The resulting SiNWs, which exhibited smooth side walls, uniform diameter, and high aspect ratio, were proved to grow along the [100] crystal direction of silicon.
Co-reporter:Lan Jin, Huiying Zhou, Shengchun Qu, Zhanguo Wang
Materials Science in Semiconductor Processing 2011 Volume 14(Issue 2) pp:108-113
Publication Date(Web):June 2011
DOI:10.1016/j.mssp.2011.01.009
Ordered indium arsenide (InAs) nanodots are formed by molecular beam epitaxy (MBE) on patterned gallium arsenide (GaAs) substrates, which are prepared by implanting manganese (Mn) ions through anodic aluminum oxide (AAO) membranes into the GaAs wafers. Morphology and structure of the patterned GaAs substrate is determined both by the oxygen desorption and the Mn ion diffusion. Suitable patterned GaAs substrates with the same dosage of Mn ions for the following epitaxy can be obtained by controlling the deoxidization As4 pressures during the oxygen desorption. Images of samples with different Mn ion implantation dosages and different molecular beam epitaxial conditions for the following deposition of InAs nanodots on the patterned GaAs substrates are characterized by atomic force microscopy (AFM). The order of the InAs nanodots is determined both by the AAO membrane and dosage of Mn ions. The density of InAs nanodots has great relation to the pore density of the AAO.
Co-reporter:Junmeng Zhang, Shengchun Qu, Lisheng Zhang, Aiwei Tang, Zhanguo Wang
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2011 Volume 79(Issue 3) pp:625-630
Publication Date(Web):August 2011
DOI:10.1016/j.saa.2011.03.045
A sandwich structured substrate was designed for quantitative molecular detection using surface enhanced Raman scattering (SERS), in which the probe molecule was sandwiched between silver nanoparticles (SNPs) and silver nanoarrays. The SNPs was prepared using Lee–Meisel method, and the silver nanoarrays was fabricated on porous anodic aluminum oxide (AAO) using electrodepositing method. The SERS studies show that the sandwich structured substrate exhibits good stability and reproducibility, and the detection sensitivity of Rhodamine 6G (R6G) and Melamine can respectively reach up to 10−19 M and 10−9 M, which is improved greatly as compared to other SERS substrates. The improved SERS sensitivity is closely associated with the stronger electromagnetic field enhancement, which stems from localized surface plasmon (LSP) coupling between the two silver nanostructures. Furthermore, the SERS intensity increased almost linearly as the mother concentration increased, which indicates that such a sandwich structure may be used as a good SERS substrate for quantitative analysis.Graphical abstractSchematic diagram of the SNPs/nanoarrays sandwich substrate for SERS.Highlights► A sandwich structured substrate with good SERS performance was designed. ► Detection sensitivity of the sandwich substrate can reach to 10−19 M of R6G. ► The sandwich substrate can be used as a quantitative analytical tool. ► The sandwich substrate also exhibits good stability and reproducibility.
Co-reporter:Zhijie Wang, Shengchun Qu, Xiangbo Zeng, Junpeng Liu, Furui Tan, Yu Bi, Zhanguo Wang
Acta Materialia 2010 Volume 58(Issue 15) pp:4950-4955
Publication Date(Web):September 2010
DOI:10.1016/j.actamat.2010.05.022
Abstract
SnS/SnO heterojunction structured nanocrystals with zigzag rod-like connected morphology were prepared by using a simple two-step method. Bulk heterojunction solar cells were fabricated using the SnS/SnO nanocrystals blended with poly(2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene) (MDMO-PPV) as the active layer. Compared with solar cells using SnS nanoparticles hybridized with MDMO-PPV as the active layer, the SnS/SnO devices showed better performance, with a power conversion efficiency higher by about one order in magnitude.
Co-reporter:Zhijie Wang, Shengchun Qu, Xiangbo Zeng, Junpeng Liu, Furui Tan, Lan Jin, Zhanguo Wang
Applied Surface Science 2010 Volume 257(Issue 2) pp:423-428
Publication Date(Web):1 November 2010
DOI:10.1016/j.apsusc.2010.07.004
Abstract
In this paper, bulk heterojunction photovoltaic devices based on the poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV):Bi2S3 nanorods hybrid material were present. To optimize the performance of the devices, the interface modification of the hybrid material that has a significant impact on the exciton dissociation efficiency was studied. An improvement in the device performance was achieved by modifying the Bi2S3 surface with a thin dye layer. Moreover, modifying the Bi2S3 surface with anthracene-9-carboxylic acid can enhance the performance further. Compared with the solar cells with Bi2S3 nanorods hybrid with the MDMO-PPV as the active layer, the anthracene-9-carboxylic acid modified devices are better in performance, with the power conversion efficiency higher by about one order in magnitude.
Co-reporter:Furui Tan, Shengchun Qu, Xiangbo Zeng, Changsha Zhang, Mingji Shi, Zhijie Wang, Lan Jin, Yu Bi, Jie Cao, Zhanguo Wang, Yanbing Hou, Feng Teng, Zhihui Feng
Solid State Communications 2010 Volume 150(1–2) pp:58-61
Publication Date(Web):January 2010
DOI:10.1016/j.ssc.2009.10.006
Co-reporter:Zhijie Wang, Shengchun Qu, Xiangbo Zeng, Junpeng Liu, Changsha Zhang, Furui Tan, Lan Jin, Zhanguo Wang
Journal of Alloys and Compounds 2009 Volume 482(1–2) pp:203-207
Publication Date(Web):12 August 2009
DOI:10.1016/j.jallcom.2009.03.158
Tin mono-sulphide (SnS) nanoparticles were synthesized by a facile method. Reactions producing narrow size distribution SnS nanoparticles with the diameter of 5.0–10 nm were carried out in an ethylene glycol solution at 150 °C for 24 h. Bulk heterojunction solar cells with the structure of indium tin oxide (ITO)/polyethylenedioxythiophene:polystyrenesulphonate (PEDOT:PSS)/SnS:polymer/Al were fabricated by blending the nanoparticles with a conjugated polymer to form the active layer for the first time. Current density–voltage characterization of the devices showed that due to the addition of SnS nanoparticles to the polymer film, the device performance can be dramatically improved, compared with that of the pristine polymer solar cells.
Co-reporter:Z.J. Wang, S.C. Qu, X.B. Zeng, J.P. Liu, C.S. Zhang, F.R. Tan, L. Jin, Z.G. Wang
Applied Surface Science 2008 Volume 255(Issue 5) pp:1916-1920
Publication Date(Web):30 December 2008
DOI:10.1016/j.apsusc.2008.06.138
Abstract
Hybrid bulk heterojunction solar cells based on blend of poly(3-hexylthiophene) (P3HT) and TiO2 nanotubes or dye(N719) modified TiO2 nanotubes were processed from solution and characterized to research the nature of organic/inorganic hybrid materials. Compared with the pristine polymer P3HT and TiO2 nanoparticles/P3HT solar cells, the TiO2 nanotubes/P3HT hybrid solar cells show obvious performance improvement, due to the formation of the bulk heterojunction and charge transport improvement. A further improvement in the device performance can be achieved by modifying TiO2 nanotube surface with a standard dye N719 which can play a role in the improvement of both the light absorption and charge dissociation. Compared with the non-modified TiO2 nanotubes solar cells, the modified ones have better power conversion efficiency under 100 mW/cm2 illumination with 500 W Xenon lamp.
Co-reporter:Kuankuan Ren, Le Huang, Shizhong Yue, Shudi Lu, Kong Liu, Muhammad Azam, Zhijie Wang, Zhongming Wei, Shengchun Qu and Zhanguo Wang
Journal of Materials Chemistry A 2017 - vol. 5(Issue 10) pp:NaN2508-2508
Publication Date(Web):2017/01/17
DOI:10.1039/C6TC05165K
Though power conversion efficiencies of perovskite solar cells of over 21% have been reported, the degradation of the performance of these cells in the presence of moisture still inhibits the commercialization of these otherwise promising devices. Herein, we decided to utilize the moisture sensitivity of perovskite materials and fabricate a moisture detector based on high-quality CH3NH3PbI3−xClx nanosheet arrays. The resulting devices present a high sensitivity towards humidity with device resistance significantly dropping from 1.28 × 108 Ω at 30% relative humidity (RH) to 7.39 × 104 Ω at 90% RH and a response even faster than that of the commercial psychrometer. This response was even steeper than those of commercial psychrometers. Moreover, our device showed good reversibility and impressive specificity. Thus, the humidity sensitivity of perovskites, while disadvantageous for solar cell applications, was found to be quite applicable in a new field.
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