Co-reporter:Ning Li, Peter Kubis, Karen Forberich, Tayebeh Ameri, Frederik C. Krebs, Christoph J. Brabec
Solar Energy Materials and Solar Cells 2014 120, Part B() pp: 701-708
Publication Date(Web):
DOI:10.1016/j.solmat.2013.09.003
Co-reporter:Ning Li, Derya Baran, Karen Forberich, Florian Machui, Tayebeh Ameri, Mathieu Turbiez, Miguel Carrasco-Orozco, Martin Drees, Antonio Facchetti, Frederik C. Krebs and Christoph J. Brabec
Energy & Environmental Science 2013 vol. 6(Issue 12) pp:3407-3413
Publication Date(Web):27 Sep 2013
DOI:10.1039/C3EE42307G
Owing to the lack of scalable high performance donor materials, studies on mass-produced organic photovoltaic (OPV) devices lag far behind that on lab-scale devices. In this work, we choose 6 already commercially available conjugated polymers and systematically investigate their potential in organic tandem solar cells. All the devices are processed under environmental conditions using doctor-blading, which is highly compatible with mass-production coating technologies. Power conversion efficiencies (PCE) of 6–7% are obtained for OPV devices based on different active layers. Optical simulations based on experimental data are performed for all realized tandem solar cells. An efficiency potential of ∼10% is estimated for these compounds in combination with phenyl-C61-butyric acid methyl ester (PCBM) as an acceptor. In addition, we assume a hypothetical, optimized acceptor to understand the limitation of donors. It is suggested that a PCE of >14% is realistic for tandem solar cells based on these commercially available donor materials. Along with the demonstration of novel intermediate layers we believe that this systematic study provides valuable insight for those attempting to realize the high efficiency potential of tandem architectures.
Co-reporter:Ning Li;Tobias Stubhan;Derya Baran;Jie Min;Haiqiao Wang;Tayebeh Ameri;Christoph J. Brabec
Advanced Energy Materials 2013 Volume 3( Issue 3) pp:301-307
Publication Date(Web):
DOI:10.1002/aenm.201200659
Co-reporter:Ning Li;Derya Baran;Karen Forberich;Mathieu Turbiez;Tayebeh Ameri;Frederik C. Krebs;Christoph J. Brabec
Advanced Energy Materials 2013 Volume 3( Issue 12) pp:1597-1605
Publication Date(Web):
DOI:10.1002/aenm.201300372
Photovoltaic tandem technology has the potential to boost the power conversion efficiency of organic photovoltaic devices. Here, a reliable and efficient fully solution-processed intermediate layer (IML) consisting of ZnO and neutralized poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is demonstrated for series-connected multi-junction organic solar cells (OSCs). Drying at 80 °C in air is sufficient for this solution-processed IML to obtain excellent functionality and reliability, which allow the use of most of high performance donor materials in the tandem structure. An open circuit voltage (Voc) of 0.56 V is obtained for single-junction OSCs based on a low band-gap polymer, while multi-junction OSCs based on the same absorber material deliver promising fill factor values along with fully additive Voc as the number of junctions increase. Optical and electrical simulations, which are reliable and promising guidelines for the design and investigation of multi-junction OSCs, are discussed. The outcome of optical and electrical simulations is in excellent agreement with the experimental data, indicating the outstanding efficiency and functionality of this solution-processed IML. The demonstration of this efficient, solution-processed IML represents a convenient way for facilitating fabrication of multi-junction OSCs to achieve high power conversion efficiency.
Co-reporter:Ning Li, Tobias Stubhan, Norman A. Luechinger, Samuel C. Halim, Gebhard J. Matt, Tayebeh Ameri, Christoph J. Brabec
Organic Electronics 2012 Volume 13(Issue 11) pp:2479-2484
Publication Date(Web):November 2012
DOI:10.1016/j.orgel.2012.06.045
Solution processing is a convenient method and also the guarantee for low cost and large-scale organic photovoltaic (OPV) production. It was recently suggested that the absorption of OPV devices can be spectrally extended by introducing ternary semiconductor blends, where a second donor with a complementary absorption spectrum is added into the active layer. In this manuscript we demonstrate the successful replacement of poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) by low temperature solution processed tungsten trioxide (WO3) nanoparticles for inverted OPV devices based on either poly(3-hexylthiophene) (P3HT): phenyl-C61-butyric acid methyl ester (PCBM) or P3HT: poly[2,1,3-benzothiadiazole-4,7-diyl[4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b′]dithiophene-2,6-diyl]] (Si-PCPDTBT):PCBM active layers. These WO3 nanoparticles can serve as fully functional anode buffer layers in inverted OPV devices without further treatment, while showing comparable functionality as PEDOT:PSS layers.Graphical abstractHighlights► Inverted organic solar cells employing solution processed WO3 anode buffer layer. ► The WO3 nanoparticles serve efficiently without any post-treatment. ► In solar cells the WO3 layer shows the similar functionality as PEDOT:PSS. ► Fill factor of >60% is obtained in the P3HT:PCBM-based inverted solar cells.
Co-reporter:Ning Li, Florian Machui, David Waller, Markus Koppe, Christoph J. Brabec
Solar Energy Materials and Solar Cells 2011 95(12) pp: 3465-3471
Publication Date(Web):
DOI:10.1016/j.solmat.2011.08.005
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