Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Mixed Sn-Pb perovskite solar cells (PSCs) with a narrow band gap have the potential to be used in all perovskite tandem solar cells. However, the Voc deficit is a crucial issue limiting the performance of mixed Sn-Pb PSCs. Recent studies have shown that unfavorable energy alignment is one of the reasons contributing to Voc deficit in mixed Sn-Pb PSCs. To address this issue, our group systematically investigated the correlation between the hole transport layer (HTL) and the perovskite active layer by tuning the work function of the common HTL used in mixed Sn-Pb PSCs, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS). By carefully reducing the work function of PEDOT:PSS up to 300meV, a favorable band bending is created at the interface between the HTL and the perovskite active layer, leading to better electron blocking capability and suppression of non-radiative recombination. As a result, improvements in Voc, Fill Factor, and PCE were observed. Our research provides valuable insights into the importance of interfacial band bending in achieving higher PCE in mixed Sn-Pb PSCs.
This study was financially supported by National Science Council of Taiwan under contracts MOST 110-2222-E-005-005-MY3
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