Surface modulation for highly efficient and stable perovskite solar cells

被引：7

作者：

Bai, Dongliang ^{[1
]}

Zheng, Dexu ^{[3
]}

Yang, Shaoan ^{[2
]}

Yu, Fengyang ^{[2
]}

Zhu, Xuejie ^{[1
]}

Peng, Lei ^{[3
]}

Wang, Likun ^{[2
]}

Liu, Jishuang ^{[3
]}

Yang, Dong ^{[2
]}

Liu, Shengzhong ^{[1
,2
]}

机构：

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

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

[3] China Natl Nucl Power Co Ltd, Beijing 100097, Peoples R China

来源：

RSC ADVANCES | 2023年 / 13卷 / 40期

基金：

中国国家自然科学基金;

关键词：

ELECTRON-TRANSPORT LAYER; PASSIVATION; METAL;

D O I：

10.1039/d3ra00809f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Defects formed by halide ion escape and wettability of the perovskite absorber are essential limiting factors in achieving high performance of perovskite solar cells (PSCs). Herein, a series of ionic organic modulators are designed to contain halide anions to prevent defect formation and improve the surface tension of the perovskite absorber. It was found that the surface modulator containing Br anions is the most effective one due to its capability in bonding with the undercoordinated Pb2+ ions to reduce charge recombination. Moreover, this surface modulator effectively creates a suitable energy level between the perovskite and hole transport layer to promote carrier transfer. In addition, the surface modulator forms a chemisorbed capping layer on the perovskite surface to improve its hydrophobicity. As a result, the efficiency of PSCs based on surface modulators containing Br anion enhances to 23.32% from 21.08% of the control device. The efficiency of unencapsulated PSCs with a surface modulator retains 75.42% of its initial value under about 35% humidity stored in the air for 28 days, while the control device only maintained 44.49% of its initial efficiency. The excellent stability originates from the hydrophobic perovskite surface after capping the surface modulator. As halogen is found to affect both passivation and hydrophobicity ability, a series of ionic organic modulators are designed to contain the halide anions not only to prevent defect formation but also to improve surface tension of the perovskite absorber.

引用

页码：28097 / 28103

页数：7

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