[18p-A408-1~8] CS.7 Code-sharing Session of 12.5 & 13.9 & 16.3

▲ [18p-A408-7] Optimization of wide-bandgap perovskite to improve the performance of all perovskite tandem solar cells

〇(PC)Gaurav Kapil^1,2, Takeru Bessho², Qing Shen¹, Hiroshi Segawa², Shuzi Hayase¹ (1.Uni. of Electr.Comm., 2.Uni. of Tokyo)

Keywords:Tandem solar cells, Wide bandgap solar cells, Surface passivation

All perovskite tandem solar cells (APTSC) are now getting great attention from solar cell community because of the rapid growth in power conversion efficiency (PCE) to >27% [1] since its first demonstration of <5% [2]. Tandem structure consists of two main parts, the narrow bandgap cell and the wide bandgap cell, ideal bandgaps of 1.2-1.3 eV and 1.7-1.8 eV respectively are necessary for achieving highest possible PCEs. The rapid advancement in PCE of APTSCs is credited to the efforts of scientists working on improving the PCE of narrow bandgap tin-lead perovskite solar cells (TLPSCs) despite presence of unstable tin component. The open circuit voltage (Voc) loss has been reduced significantly and now approaching to the Schockley-Queisser (SQ) limit [3]. Therefore, at present, the research demands improvement in performance of wide bandgap solar cells, specially from the viewpoint of decrease in Voc loss. In this work, we concluded that high voltage-loss in wide-bandgap solar cell is the bottleneck in further improvement of tandem solar cells that need to overcome. Apart from this, halide segregation is one of the key issues that need to be solved. Therefore, in our work we highlighted these drawbacks and the strategies to overcome the issues.
References
H. Chen and H. Sargent et al, Nature, 2022, 10.1038/s41586-022-05541-z.
J. Marko and S. Albrecht et al, Adv. Energy Mater., 2020, 10, 1904102
G. Kapil and S. Hayase et al., ACS Energy Letters, 2022, 7, 966-974.