DataVXACS Energy LettersPaper
journal article·2021-05-14

Suppressing the Trapping Process by Interfacial Charge Extraction in Antimony Selenide Heterojunctions

Zeyu Zhang, Manchen Hu, Tingyuan Jia, Juan Du, Chao Chen, Chunwei Wang, Zhengzheng Liu, Tongchao Shi, Jiang Tang, Yuxin Leng

ACS Energy Letters· Volume 6· Issue 5
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Source abstract

Abstract

The efficiency of antimony selenide (Sb2Se3) solar cells has been improved from <2% to >10% within only 7 years, but fundamental properties at the heterojunction interface such as the charge carrier transfer and the trap state localizing process has not been studied yet. Here, the carrier competing dynamics in Sb2Se3-based heterojunction has been systematically investigated. We find the competition between the band-edge electron transfer and the trapping process in CdS/Sb2Se3 will result in less-efficient charge separation and hence low open circuit voltage in photovoltaic devices. In contrast, the hot electron extraction at the SnO2/Sb2Se3 interface is nearly an order of magnitude faster than the trapping process, which can effectively escape the trapping carrier loss and potentially lead to higher open-circuit voltages. Our results reveal the hidden role of the buffer interface in the ultrafast charge extraction and provide a potential strategy to improve the performance of Sb2Se3-based solar cells.
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Research context

Electronic materials

OpenAlex topics: Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties · Perovskite Materials and Applications

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

Affiliations

State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS), Shanghai 201800, China

Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), Wuhan 430074, China

School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Shanghai 201210, China

Funding

China Postdoctoral Science Foundation · National Natural Science Foundation of China · Department of S and T for Social Development · Chinese Academy of Sciences · Program of Shanghai Academic/Technology Research Leader

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