DataVXACS Energy LettersPaper
journal article·2021-06-11

Cobalt Chloride Hexahydrate Assisted in Reducing Energy Loss in Perovskite Solar Cells with Record Open-Circuit Voltage of 1.20 V

Pengyang Wang, Bingbing Chen, Renjie Li, Sanlong Wang, Ningyu Ren, Yucheng Li, Sayantan Mazumdar, Biao Shi, Ying Zhao, Xiaodan Zhang

ACS Energy Letters· Volume 6· Issue 6
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Source abstract

Abstract

SnO2 is widely used and one of the most efficient electron transport layers in perovskite solar cells (PSCs). However, SnO2 films often contain detrimental defects and may also have mismatches in energy level alignment with perovskite films, thus limiting the open-circuit voltage (VOC). Managing the defects and band structure are critical to reduce energy loss in PSCs. Herein, cobalt chloride hexahydrate (CoCl2·6H2O) is introduced into a SnO2 film, which shows favorable energy level alignment and better charge extraction. Correspondingly, an enhanced VOC up to 1.20 V was achieved along with an efficiency of 23.82%, which is the record open-circuit voltage at the optical band gap of 1.54 eV in planar structure PSCs. Moreover, the target devices show enhanced stability, which retains 83.5% of their initial efficiencies after 200 h under continuous irradiation. The doping method provides an effective strategy for reducing energy loss to further enhance the efficiency of PSCs.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Quantum Dots Synthesis And Properties

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, PR China

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

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

Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR 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 · Higher Education Discipline Innovation Project · Tianjin Science and Technology Project · Hebei Province

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