Decylammonium sulfate post-treatment for efficient hole-conductor-free printable perovskite solar cells with reduced voltage loss

被引:4
作者
Qiu, Zexiong [1 ]
Liu, Jiale [1 ]
Han, Chuanzhou [1 ]
Wang, Chaoyang [1 ]
Xiang, Junwei [1 ]
Zheng, Ziwei [1 ]
Xia, Minhao [1 ]
Zhou, Yang [1 ]
Mei, Anyi [1 ]
Han, Hongwei [1 ]
机构
[1] Huazhong Univ Sci & Technol, Michael Gratzel Ctr Mesoscop Solar Cells, Key Lab Mat Chem Energy Convers & Storage, Wuhan Natl Lab Optoelect,Minist Educ, Wuhan 430074, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
Carbon electrodes - Defect density - Ionomers - Negative ions - Perovskite - Photodissociation - Positive ions;
D O I
10.1038/s43246-024-00643-9
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Hole-conductor-free printable mesoscopic perovskite solar cells (p-MPSCs) have attracted widespread attention for their low cost, up-scalability, and exceptional stability. However, the high defect density of perovskite and the absence of interfacial barrier layer between perovskite and carbon electrode cause profound open-circuit voltage (VOC) loss, which results in uncompetitive power conversion efficiency (PCE). Herein, an anion-cation synergy of decylammonium sulfate (DA2SO4) is utilized for suppressing VOC loss of p-MPSCs via a facile post-treatment method. DA+ cations transform the perovskite adjacent to carbon electrode into wide-bandgap 2D perovskite for blocking electrons, while the SO42- anions interact with undercoordinated lead centers for reducing defect density. As a result, the modified device delivers an enhanced PCE from 17.78% to 19.59%, with an improved VOC from 0.98 V to 1.06 V. Meanwhile, the modified device without any encapsulation exhibits excellent moisture stability with the PCE remained almost 99% of the initial value after 528 h aging in 75% RH air at room temperature. Open-circuit voltage loss is an issue faced by hole-conductor-free printable mesoscopic perovskite solar cells. Here, a facile decylammonium sulfate post-treatment reduces the voltage loss via an anion-cation synergy, and increases the power conversion efficiency from 17.8% to 19.6%.
引用
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页数:8
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