Surface Defects Management by In Situ Etching with Methanol for Efficient Inverted Inorganic Perovskite Solar Cells

Hongrui Sun; Sanlong Wang; Shanshan QiPengyang WangRenjie LiBiao ShiQixing ZhangQian HuangShengzhi XuYing ZhaoXiaodan Zhang

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Surface Defects Management by In Situ Etching with Methanol for Efficient Inverted Inorganic Perovskite Solar Cells

机译：Surface Defects Management by In Situ Etching with Methanol for Efficient Inverted Inorganic Perovskite Solar Cells

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Inorganic perovskite solar cells (IPSCs) have developed rapidly due to theirgood thermal stability and the bandgap suitable for perovskite/silicon tandemsolar cells. However, the large open-circuit voltage (V_(OC)) deficit derived fromthe surface defects and the energy level structure mismatch impede the developmentof device performance, especially in the P-I-N structure IPSCs. Herein,an innovative in situ etching (ISE) treatment method is proposed to reducesurface defects through methanol without additional passivator. It is found thatthe perovskite films treated with methanol result in a slight excess of PbI_2 onthe surface and inserted into the grain boundaries. Therefore, the successfuldecrease of surface defects by methanol and the passivation of grain boundarydefects by PbI_2 greatly reduce the trap density of perovskite films. And thelarger work function of PbI_2 contributes to the energy band of perovskitesurface bending downward and forms gradient energy level alignment at theI/N interface, which accelerates extraction of charge carriers. As a result, theefficiency of CsPbI_(2.85)Br_(0.15) inverted IPSC is enhanced from 16.00% to 19.34%,which is one of the mostly efficient IPSCs. This work provides an original ideawithout additional passivator to manage the defects of inorganic perovskite.

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来源
《Advanced functional materials》 |2023年第23期|2213913.1-2213913.8|共8页
作者
Hongrui Sun; Sanlong Wang; Shanshan QiPengyang WangRenjie LiBiao ShiQixing ZhangQian HuangShengzhi XuYing ZhaoXiaodan Zhang;
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作者单位

Institute of Photoelectronic Thin Film Devices and TechnologyRenewable Energy Conversion and Storage CenterSolar Energy Research CenterNankai UniversityTianjin 300350, P. R. China Key Laboratory of Photoelectronic Thin Film Devicesand Technology of Tianji;

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正文语种英语
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energy level alignments; inorganic perovskite solar cells; inverted structures; methanol; surface defects;

Surface Defects Management by In Situ Etching with Methanol for Efficient Inverted Inorganic Perovskite Solar Cells

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