DataVXACS Energy LettersPaper
journal article·2021-08-13

Modulated Crystallization and Reduced VOC Deficit of Mixed Lead–Tin Perovskite Solar Cells with Antioxidant Caffeic Acid

Hui Liu, Lixuan Wang, Renjie Li, Biao Shi, Pengyang Wang, Ying Zhao, Xiaodan Zhang

ACS Energy Letters· Volume 6· Issue 8
Publisher page
Source abstract

Abstract

Mixed lead–tin (Pb–Sn) perovskite photovoltaics have attracted great attention for reducing toxic lead and tuning optical bandgaps. However, the main challenges are the uncontrolled crystallization rate of perovskite films and easy oxidation of Sn2+, which can give rise to rough morphology and unwanted p-type doping. Herein, we precisely modulated the crystallization process of the mixed Pb–Sn perovskite by adjusting the energy barrier of nucleation with the help of caffeic acid (CA), a natural antioxidant, which is introduced into the perovskite precursor solution. We demonstrated CA also could depress the oxidation of Sn2+ to Sn4+ effectively by reducing hydroxyl functional groups, leading to the reduction of background carriers and hole trap densities. Therefore, an efficiency of 19.85% was obtained with an impressive open-circuit voltage of 0.855 V for mixed Pb–Sn perovskite solar cells with high reproducibility.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Photoelectronic Thin Film Devices and Technology, Renewable Energy Conversion and Storage Center, Solar Energy Conversion Center, Nankai University, Tianjin 300350, China

Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin, Tianjin 300350, China

Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education, Tianjin 300350, China

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

Funding

Natural Science Foundation of Tianjin City · Nankai University · Ministry of Science and Technology of the People's Republic of China · China Postdoctoral Science Foundation · National Natural Science Foundation of China · Higher Education Discipline Innovation Project · Tianjin Science and Technology Project · Hebei Province

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