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- Title
Energy Level Tuning of PEDOT:PSS for High Performance Tin‐Lead Mixed Perovskite Solar Cells.
- Authors
Tang, Haoying; Shang, Yuequn; Zhou, Wenjia; Peng, Zijian; Ning, Zhijun
- Abstract
Small bandgap Sn‐Pb mixed perovskite is generally regarded as the most promising structure to further enhance the power conversion efficiency of perovskite solar cells. However, the open circuit voltages (VOCs) are usually lower than expected. In this work, by doping the generally used hole transporting layer (HTL) poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT:PSS) with a perfluorinated ionomer (PFI), we can tune the work function of it from −5.02 to −5.19 eV. This reduces the energy level mismatch between the FA0.6MA0.4 Sn0.6Pb0.4I3 (FAMA) absorber and HTL, giving rise to enhanced built‐in voltage and better carrier extraction. The VOC improves to over 50 mV, up to 0.783 V, resulting in an improved champion power conversion efficiency (PCE) of 15.85%. Moreover, the devices based on modified HTLs show improved stability at maximum power point. These results demonstrate that energy level tuning of the HTL is a promising strategy for the improvement of the PCEs of Sn‐Pb mixed inverted PSCs, and the addition of PFI is an effective method to tune the work function of PEDOT:PSS. The energy level mismatch between a FA0.6MA0.4 Sn0.6Pb0.4I3 absorber and PEDOT:PSS based hole transporting layer are reduced and an improved VOC over 50 mV and hence power conversion efficiencies of up to 15.85% are achieved.
- Subjects
BAND gaps; ENERGY conversion; IONOMERS
- Publication
Solar RRL, 2019, Vol 3, Issue 2, pN.PAG
- ISSN
2367-198X
- Publication type
Article
- DOI
10.1002/solr.201800256