Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
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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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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