Extrinsic Ion Distribution Induced Field Effect in CsPbIBr2 Perovskite Solar Cells

被引：57

作者：

Wang, Yulong ^{[1
]}

Wang, Kai ^{[2
]}

Subhani, Waqas Siddique ^{[2
,3
]}

Zhang, Congqiang ^{[1
]}

Jiang, Xiao ^{[2
]}

Wang, Shimin ^{[1
]}

Bao, Huaxi ^{[1
]}

Liu, Lu ^{[2
]}

Wan, Li ^{[1
]}

Liu, Shengzhong ^{[2
,4
]}

机构：

[1] Hubei Univ, Key Lab Green Preparat & Applicat Funct Mat, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Minist Educ,Fac Mat Sci & Engn,Hubei Key Lab Poly, Wuhan 430062, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, iChEM, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

[4] Shaanxi Normal Univ, Sch Mat Sci & Engn, Shaanxi Engn Lab Adv Energy Technol, Key Lab Appl Surface & Colloid Chem,Minist Educ, Xian 710119, Shaanxi, Peoples R China

来源：

SMALL | 2020年 / 16卷 / 17期

基金：

中国国家自然科学基金;

关键词：

additive engineering; inorganic perovskites; moisture stability; perovskite solar cells; sulfamic acid sodium; ALL-INORGANIC PEROVSKITE; HYBRID PEROVSKITE; HIGH-EFFICIENCY; ENHANCEMENT; PASSIVATION; PERFORMANCE; FABRICATION; HYSTERESIS; CRYSTAL; GROWTH;

D O I：

10.1002/smll.201907283

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Excellent power conversion efficiency (PCE) and stability are the primary forces that propel the all-inorganic cesium-based halide perovskite solar cells (PSCs) toward commercialization. However, the intrinsic high density of trap state and internal nonradiative recombination of CsPbIBr2 perovskite film are the barriers that limit its development. In the present study, a facile additive strategy is introduced to fabricate highly efficient CsPbIBr2 PSCs by incorporating sulfamic acid sodium salt (SAS) into the perovskite layer. The additive can control the crystallization behaviors and optimize morphology, as well as effectively passivate defects in the bulk perovskite film, thereby resulting in a high-quality perovskite. In addition, SAS in perovskite has possibly introduced an additional internal electric field effect that favors electron transport and injection due to inhomogeneous ion distribution. A champion PCE of 10.57% (steady-output efficiency is 9.99%) is achieved under 1 Sun illumination, which surpasses that of the contrast sample by 16.84%. The modified perovskite film also exhibits improved moisture stability. The unencapsulated device maintains over 80% initial PCE after aging for 198 h in air. The results provide a suitable additive for inorganic perovskite and introduce a new conjecture to explain the function of additives in PSCs more rationally.

引用

页数：10

共 54 条

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