Pure-Phase, Large-Grained Wide-Band-Gap Perovskite Films for High-Efficiency, Four-Terminal Perovskite/Silicon Tandem Solar Cells

Shaohua Ma; Weidong Zhu; Tianjiao Han; Chunfu Zhang; Peng Gao; Yonggang Guo; Zhicheng Song; Yufeng Ni; Dayong Qiao

doi:10.1021/acsami.3c05333

Pure-Phase, Large-Grained Wide-Band-Gap Perovskite Films for High-Efficiency, Four-Terminal Perovskite/Silicon Tandem Solar Cells

ACS Appl Mater Interfaces. 2023 Aug 30;15(34):40719-40726. doi: 10.1021/acsami.3c05333. Epub 2023 Aug 17.

Authors

Shaohua Ma¹, Weidong Zhu^{2

3}, Tianjiao Han², Chunfu Zhang², Peng Gao³, Yonggang Guo³, Zhicheng Song³, Yufeng Ni³, Dayong Qiao¹

Affiliations

¹ Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, China.
² State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi'an 710071, China.
³ Qinghai Huanghe Hydropower Development Co., Ltd., Xining Solar Power Branch, Xining 810007, China.

PMID: 37590369
DOI: 10.1021/acsami.3c05333

Abstract

High-quality, stable perovskite films with a wide band gap between 1.65 and 1.80 eV are highly suitable for efficient and cost-competitive silicon-based tandem solar cells. Herein, we demonstrate that the combined strategies of the Pb(SCN)₂ additive and air annealing can enable the Cs_0.22FA_0.78Pb(I_0.85Br_0.15)₃ films with a wide band gap of 1.65 eV and favored properties including pure composition, high crystallinity, micro-sized grains, and reduced defects. With these desired films, the average efficiencies of semitransparent perovskite solar cells (PSCs) are boosted from (18.13 ± 0.31) to (20.35 ± 0.28)%. Further, the semitransparent PSC is used to assemble the four-terminal perovskite/TOPCon tandem solar cell. Benefiting from its excellent performance and preferred optical properties, the obtained tandem solar cell yields a milestone efficiency of 30.32%.

Keywords: Pb(SCN)2 additive; air annealing; impurity phase; tandem solar cells; wide-band-gap perovskite.