콘텐츠 본문
논문 해외 국제전문학술지(SCI급) Bromide Incorporation Enhances Vertical Orientation of Triple Organic Cation Tin-Halide Perovskites for High-Performance Lead-Free Solar Cells
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2022-11
- 저자명 홍기하공동(교신),Song Chang Eun,Im Sang Hyuk,Lee Jong-Cheol,Shin Won Suk,Lee Sang Kyu,Lee Hang Ken,박종구,Ryu Du Hyeon,Khan Nasir
- 학술지명 SOLAR RRL
- 발행처명 WILEY-V C H VERLAG GMBH
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 10
논문 초록 (Abstract)
Tin-halide perovskite solar cells (THPSCs) are attractive in the photovoltaic field as promising candidates to address the issue of potential lead toxicity and approach the theoretical efficiency limit in lead-halide perovskite photovoltaics. Nevertheless, THPSCs suffer from fast crystallization, low defect tolerance, mismatched energy levels, as well as severe oxidation from Sn2+ to Sn4+, leading to the low performance of devices. Herein, bromide is incorporated in the PEA0.15EA0.15FA0.70SnI1−XBrX perovskite precursor, which produces 2D/3D hybrid cations tin-halide perovskite films with highly vertical oriented crystallization, favorable band-level alignment, and suppressed tin oxidation. This leads to the decrease of trap density and charge recombination losses and the enhancement of charge carrier extraction in THPSCs. Consequently, the power conversion efficiency of the optimal THPSC (X = 0.30) surges to 10.12% in contrast to 7.13% of the control device (X = 0.00), along with a nearly eliminated current–voltage hysteresis. Furthermore, bromine-incorporated THPSCs exhibit outstanding light soaking and humidity stability. These results are also in good agreement with the density functional theory calculations. This compositional engineering with Br could become a promising approach for improving the efficiency and stability of THPSCs.
