25.24%-Efficiency FACsPbI3 Perovskite Solar Cells Enabled by Intermolecular Esterification Reaction of DL-Carnitine Hydrochloride

被引：178

作者：

Yang, Lu ^{[1
]}

Zhou, Hui ^{[1
]}

Duan, Yuwei ^{[1
]}

Wu, Meizi ^{[1
]}

He, Kun ^{[1
]}

Li, Yong ^{[1
]}

Xu, Dongfang ^{[1
]}

Zou, Hong ^{[1
]}

Yang, Shaoming ^{[1
]}

Fang, Zhimin ^{[1
]}

Liu, Shengzhong ^{[1
,2
]}

Liu, Zhike ^{[1
]}

机构：

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

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

来源：

ADVANCED MATERIALS | 2023年 / 35卷 / 16期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

DL-carnitine hydrochloride; DL-dimers; intermolecular esterification reaction; passivation; perovskite solar cells; STATE;

D O I：

10.1002/adma.202211545

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Judicious tailoring of the interface between the SnO2 electron-transport layer and the perovskite buried surface plays a pivotal role in obtaining highly efficient and stable perovskite solar cells (PSCs). Herein, a DL-carnitine hydrochloride (DL) is incorporated into the perovskite/SnO2 interface to suppress the defect-states density. A DL-dimer is obtained at the interface by an intermolecular esterification reaction. For the SnO2 film, the Cl- in the DL-dimer can passivate oxygen vacancies (V-O) through electrostatic coupling, while the N in the DL-dimer can coordinate with the Sn4+ to passivate Sn-related defects. For the perovskite film, the DL-dimer can passivate FA(+) defects via hydrogen bonding and Pb-related defects more efficiently than the DL monomer. Upon DL-dimer modification, the interfacial defects are effectively passivated and the quality of the resultant perovskite film is improved. As a result, the DL-treated device achieves a gratifying open-circuit voltage (V-OC) of 1.20 V and a champion power conversion efficiency (PCE) of 25.24%, which is a record value among all the reported FACsPbI(3) PSCs to date. In addition, the unencapsulated devices exhibit a charming stability, sustaining 99.20% and 90.00% of their initial PCEs after aging in air for 1200 h and continuously operating at the maximum power point tracking for 500 h, respectively.

引用

页数：10

共 56 条

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