Universal Approach for Managing Iodine Migration in Inverted Single-Junction and Tandem Perovskite Solar Cells

被引:8
作者
Song, Zhenhua [1 ,2 ]
Sun, Kexuan [1 ]
Meng, Yuanyuan [1 ]
Zhu, Zewei [1 ]
Wang, Yaohua [1 ]
Zhang, Weifu [1 ]
Bai, Yang [1 ]
Lu, Xiaoyi [1 ]
Tian, Ruijia [1 ]
Liu, Chang [1 ]
Ge, Ziyi [1 ,3 ]
机构
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Prov Engn Res Ctr Energy Optoelect Mat &, Ningbo 315201, Peoples R China
[2] Ningbo Univ, Sch Mat Sci & Chem Engn, Ningbo 315211, Peoples R China
[3] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
halide migration; iodide ion migration; light stability; operational stability; perovskite solar cells; EFFICIENT; STABILITY; PHOTOVOLTAICS; DEGRADATION;
D O I
10.1002/adma.202410779
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Despite significant progress in the power-conversion efficiency (PCE) of perovskite solar cells (PSCs), the instability of devices remains a considerable obstacle for commercial applications. This instability primarily originates from the migration of halide ions-particularly iodide ions (I-). Under light exposure and thermal stress, I- migrates and transforms into I2, leading to irreversible degradation and performance loss. To address this issue, we introduced the additive 2,1,3-benzothiadiazole,5,6-difluoro-4,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl) (BT2F-2B) into the perovskite. The strong coordination between the unhybridized p orbital and lone-pair electrons from I- inhibits the deprotonation of MAI/FAI and the subsequent conversion of I- to I-2. The highly electronegative fluorine enhances its electrostatic interaction with I-. Consequently, the synergistic effect of BT2F-2B effectively suppresses the decomposition of perovskite and the defect density of the iodide vacancies. This approach delivers a PCE over 26% for inverted single-junction PSCs, with exceptional operational stability. According to the ISOS-L-3 testing protocol (maximum power point tracking at 85 degrees C and 50% relative humidity), treated PSCs retain 85% of their original PCE after 1000 h of aging. When the BT2F-2B is applied to a wide-bandgap (1.77 eV) perovskite system, the PCE of all-perovskite tandem solar cells reaches 27.8%, confirming the universality of the proposed strategy.
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页数:12
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