Grain Boundary Healing of Organic-Inorganic Halide Perovskites for Moisture Stability

被引：29

作者：

Chun, Do Hyung ^{[1
]}

Kim, Sungsoon ^{[1
]}

Chai, Sung Uk ^{[2
]}

Kim, Wook ^{[3
]}

Kim, Wanjung ^{[1
]}

Lee, Jung Hwan ^{[1
]}

Rhee, Ryan ^{[1
]}

Choi, Dukhyun ^{[3
]}

Kim, Jung Kyu ^{[4
]}

Shin, Hyunjung ^{[5
]}

Park, Jong Hyeok ^{[1
]}

机构：

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

[2] KIST, Photoelect Hybrids Res Ctr, Seoul 02792, South Korea

[3] Kyung Hee Univ, Dept Mech Engn, 1732 Deogyeongdaero, Yongin 17104, Gyeonggi Do, South Korea

[4] Sungkyunkwan Univ, Dept Chem Engn, Suwon 440746, South Korea

[5] Sungkyunkwan Univ, Dept Energy Sci, Suwon 440746, South Korea

来源：

NANO LETTERS | 2019年 / 19卷 / 09期

基金：

新加坡国家研究基金会;

关键词：

halide perovskites; pressure-induced crystallization; grain boundary healing; moisture stability; SOLAR-CELLS; EFFICIENCY; GROWTH; SIZE;

D O I：

10.1021/acs.nanolett.9b02721

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Although organic-inorganic halide perovskite (OIHP)-based photovoltaics have high photoconversion efficiency (PCE), their poor humidity stability prevents commercialization. To overcome this critical hurdle, focusing on the grain boundary (GB) of OIHPs, which is the main humidity penetration channel, is crucial. Herein, pressure-induced crystallization of OIHP films prepared with controlled mold geometries is demonstrated as a GB-healing technique to obtain high moisture stability. When exposed to 85% RH at 30 degrees C, OIHP films fabricated by pressure-induced crystallization have enhanced moisture stability due to the enlarged OIHP grain size and low-angle GBs. The crystallographic and optical properties indicate the effect of applying pressure onto OIHP films in terms of moisture stability. The photovoltaic devices with pressure-induced crystallization exhibited dramatically stabilized performance and sustained over 0.95 normalized PCE after 200 h at 40% RH and 30 degrees C.

引用

页码：6498 / 6505

页数：8

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