Enhanced Charge Selectivity via Anodic-C60 Layer Reduces Non-Radiative Losses in Organic Solar Cells
Manasi Venkataramani c, Johannes Benduhn c, Mathias Nyman a, Seyed Mehrdad Hosseini b, Jonas Kublitski c, Safa Shoaee b, Dieter Neher b, Karl Leo c, Donato Spoltore c
a Physics, Faculty of Science and Engineering, Åbo Akademi University, Turku Finland, Finland
b Institute of Physics and Astronomy, University of Potsdam, DE, Karl-Liebknecht-Straße, 24-25, Potsdam, Germany
c IAPP (Institut fuer Angewandte Photophysik),, TU Dresden, 01062, Dresden,
Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Online, Spain, 2020 May 26th - 29th
Organizers: Tracey Clarke, James Durrant, Annamaria Petrozza and Trystan Watson
Poster, Donato Spoltore, 129
Publication date: 22nd May 2020

Interfacial layers in conjunction with suitable charge transport layers can significantly improve the open-circuit voltage and fill factor of solar cells, by facilitating efficient charge carrier transport and extraction. This work experimentally shows that the extent of contact between donor molecules in the photoactive layer of organic solar cells and an already-proven efficient Molybdenum Oxide (MoO3) hole extraction layer causes a proportional increase in non-radiative recombination losses. Using several planar and bulk heterojunction device architectures, the effect of surface recombination is quantified, and it is shown that such losses can be suppressed by inserting a thin anodic-C60 acceptor interlayer. This enhances the built-in potential and reduces the presence of minority charge carriers at the electrodes: a new perspective on the principle of selective charge extraction layers. The benefit to device efficiency is limited by a critical interlayer thickness, which is dependent on the donor material in bilayer devices. Given the high popularity of MoO3 as an efficient hole extraction and injection layer, these findings are relevant to and address different branches of organic electronics, providing insights for future device design.

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