A Comparison of Charge Carrier Dynamics in Organic and Perovskite Solar Cells
Hyojung Cha a, Jiaying Wu b, James Durrant c
a Kyungpook National University, Department of Hydrogen & Renewable Energy, ITA Convergence Graduate School, Daegu 41566, South Korea
b HKUST, Clear Water Bay Road, Hong Kong
c Department of Chemistry, Imperial College London Molecular Sciences Research Hub, White City Campus 80 Wood Lane, London W12 0BZ, UK
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
London, United Kingdom, 2023 June 12th - 14th
Organizers: Tracey Clarke, James Durrant and Trystan Watson
Poster, Hyojung Cha, 070
Publication date: 30th March 2023

Here we focus on comparing these processes between organic solar cells (OSCs) and perovskite solar cells (PSCs), with the hope this comparison will provide new insights and help the OSC and PSC communities learn and adapt successful strategies from each other. Whilst OSCs and PSCs share similar device architectures and often similar charge extraction layers and metal contact, the intrinsic properties of the light absorbing layers show obvious differences in both systems. These include differences in photoinduced charge generation (exciton separation in OSCs versus direct photoexcitation in PSCs), charge transport (hopping-like transport in organic semiconductors versus band-like transport in perovskite semiconductors), the presence of a donor:acceptor bulk heterojunction in most OSCs, and the presence of relatively mobile ions in PSCs. Here, we address how these different intrinsic materials properties result in differences in device function and performance, and how knowledge and device models developed for one technology can be successfully applied to the other. We start by focusing on the similarities and differences in device architecture, materials and operating principles between these two technologies. We move on to discuss charge generation and separation, and in particular lessons from ultrafast transient absorption and photoluminescence studies. We address charge transport, trapping and recombination, and the competition between charge extraction and bimolecular recombination, focusing in particular on lessons from transient optoelectronic analyses. Finally, we summarise materials and device design guidelines developed from these studies to guide further enhancement in device performance for both OSCs and PSCs.

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