Interfacial ?-FAPbI3 phase stabilization by reducing oxygen vacancies in SnO2_x

被引：62

作者：

Lee, Jung Hwan ^{[1
]}

Lee, SunJe ^{[1
]}

Kim, Taehee ^{[2
,3
]}

Ahn, Hyungju ^{[4
]}

Jang, Gyu Yong ^{[1
]}

Kim, Kwang Hee ^{[1
]}

Cho, Yoon Jun ^{[1
]}

Zhang, Kan ^{[5
]}

Park, Ji-Sang ^{[6
,7
,8
]}

Park, Jong Hyeok ^{[1
]}

机构：

[1] Yonsei Univ, Dept Chem & Biomol Engn, 50 Yonsei Ro, Seoul 03722, South Korea

[2] Yonsei Univ, Spect Lab Funct Elect Syst, 50 Yonsei Ro, Seoul 03722, South Korea

[3] Yonsei Univ, Dept Chem, 50 Yonsei Ro, Seoul 03722, South Korea

[4] Pohang Accelerator Lab PAL, Pohang 790784, South Korea

[5] Nanjing Univ Sci & Technol, Coll Mat & Devices, Nanjing 210094, Peoples R China

[6] Kyungpook Natl Univ, Dept Phys, Daegu 41566, South Korea

[7] Sungkyunkwan Univ, SKKU Adv Inst Nano Technol SAINT, Suwon 16419, South Korea

[8] Sungkyunkwan Univ, Dept Nano Engn, Suwon 16419, South Korea

来源：

JOULE | 2023年 / 7卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

FORMAMIDINIUM LEAD IODIDE; PEROVSKITE; PERFORMANCE; EFFICIENT;

D O I：

10.1016/j.joule.2022.12.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Reducing nonradiative recombination in SnO2_x has been a critical point for fabricating efficient and stable perovskite solar cells (PSCs). Controlling oxygen vacancies in SnO2_x is an efficient strat-egy, but most research only presents the consequential results without scrutinizing the phenomenological part of the strategy. Here, we deeply examined and revealed a new beneficial effect of controlling oxygen vacancies in SnO2_x. Oxygen atoms of SnO2_x were responsible for retaining a-FAPbI3 at the FAPbI3/SnO2_x inter-face by controlling the formation of iodine interstitials, which are strong initiators of unfavorable perovskite phase transitions. Using crystallographic analysis, we observed suppression of these phase transitions when oxygen vacancies were mitigated in SnO2_x by oxidized black phosphorus quantum dots. Furthermore, formamidi-nium (FA) cation retention was also observed as a beneficial effect of the strategy by introducing hydrogen bonding sources for FA cat-ions at the interface. Our findings suggest the genuine necessity of oxygen vacancy reduction in SnO2_x.

引用

页码：380 / 397

页数：19

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