Volume 7, Issue 3 2201276
Research Article

Reduced VOC Deficit of Mixed Lead–Tin Perovskite Solar Cells via Strain-Releasing and Synergistic Passivation Additives

Wentao Chen

Wentao Chen

School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350 China

Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072 China

Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192 China

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Yuqiong Huang

Yuqiong Huang

School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350 China

Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072 China

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Hong Cui

Hong Cui

School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350 China

Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072 China

Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192 China

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Sihan Li

Sihan Li

School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350 China

Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072 China

Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192 China

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Yaqing Feng

Yaqing Feng

School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350 China

Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072 China

Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192 China

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Bao Zhang

Corresponding Author

Bao Zhang

School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350 China

Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072 China

Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300192 China

E-mail: [email protected]

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First published: 30 January 2023
Citations: 7

Abstract

The power conversion efficiency (PCE) of tin–lead perovskite solar cells (PSCs) is normally lower than that of Pb cells, mainly due to greater open circuit voltage (VOC) losses. Herein, the additive 2,6-diaminopyridine (TNPD) is designed to anchor on the surface of the perovskite precursor colloid as nucleating agent to modulate the growth of Pb–Sn perovskites. It is observed that the TNPD not only effectively induces crystal growth during the nucleation stage, remaining on the crystal surface and ultimately passivating the resulting perovskite films, but also releases the micro-strain generated during the film growth. Furthermore, TNPD could lower the defect density (Sn4+ amount) by screening the perovskite against oxygen and by synergistically bonding with undercoordinated Sn/Pb on the surface. Finally, a high VOC of 0.85 V is obtained, corresponding to a voltage deficit of 0.41 V using a perovskite absorber with a bandgap of 1.26 eV, and a high PCE (20.35%) reported so far for Pb–Sn PSCs. Moreover, the stability of the TNPD-incorporated device is significantly improved, and the PCE maintains 50% of the initial value after about 1000 h storage in glovebox without encapsulated, in comparison to that of the control device (about 700 h, maintaining 30% of the initial value).

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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