콘텐츠 본문
논문 해외 국제전문학술지(SCI급) Roles of SnX2 (X = F, Cl, Br) Additives in Tin-Based Halide Perovskites toward Highly Efficient and Stable Lead-Free Perovskite Solar Cells
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2018-10
- 저자명 Sang Hwa Moon,Hyungjun Kim,Sang Hyuk Im,홍기하공동(교신),Jongseob Kim,Jin Hyuck Heo
- 학술지명 JOURNAL OF PHYSICAL CHEMISTRY LETTERS
- 발행처명 AMER CHEMICAL SOC
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 6
논문 초록 (Abstract)
Preserving the stability of Sn-based halide perovskites is a primary concern in developing photovoltaic light-absorbing materials for lead-free perovskite solar cells. Whereas the addition of SnX2 (X = F, Cl, Br) has been demonstrated to improve the photovoltaic performance of Sn halide perovskite solar cells, the mechanistic roles of SnX2 in the performance enhancement have not yet been studied appropriately. Here we perform a comparative study of CsSnI3 films and devices and examine how SnX2 additives affect their stability, and the results are corroborated by first-principles-based theoretical calculations. Unlike the conventional belief that the additives annihilate defects, we find that the additives effectively passivate the surface and stabilize the perovskite phase, promoting the stability of CsSnI3. Our mechanism suggests that SnBr2, which shows ca. 100 h of prolonged stability along with a high power conversion efficiency of 4.3%, is the best additive for enhancing the stability of CsSnI3.
