Affiliation:
1. School of Chemical Engineering and Technology Tianjin University Tianjin 300350 China
2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 China
3. Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192 China
Abstract
AbstractThe 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).
Funder
Fundamental Research Funds for the Central Universities
National Key Research and Development Program of China
Subject
General Materials Science,General Chemistry
Cited by
4 articles.
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