journal article·2021-03-03

CdS Induced Passivation toward High Efficiency and Stable Planar Perovskite Solar Cells

Wenyan Zhao, Jiangjian Shi, Chuanjin Tian, Jionghua Wu, Hongshi Li, Yusheng Li, Bingcheng Yu, Yanhong Luo, Huijue Wu, Zhipeng Xie, Changan Wang, Defang Duan, Dongmei Li, Qingbo Meng

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Abstract

In perovskite solar cells, the halide vacancy defects on the perovskite film surface/interface will instigate charge recombination, leading to a decrease in cell performance. In this study, cadmium sulfide (CdS) has been introduced into the precursor solution to reduce the halide vacancy defects and improve the cell performance. The highest efficiency of the device reaches 21.62%. Density functional theory calculation reveals that the incorporated Cd2+ ions can partially replace Pb2+ ions, thus forming a strong Cd–I bond and effectively reducing iodide vacancy defects (VI); at the same time, the loss of the charge recombination is significantly reduced because VI is filled by S2– ions. Besides, the substitution of Cd2+ for Pb2+ could increase the generation of PbI2, which can further passivate the grain boundary. Therefore, the stability of the cells, together with the efficiency of the power conversion efficiencies (PCEs), is also improved, maintaining 87.5% of its initial PCEs after being irradiated over 410 h. This work provides a very effective strategy to passivate the surface/interface defects of perovskite films for more efficient and stable optoelectronic devices.
Source: openalex_inverted_index · Quality: baseline

Research context

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

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

Affiliations

Key Laboratory for Renewable Energy (CAS), Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing 100190, China

School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China

School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, PR China

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

Funding

Ministry of Science and Technology of the People's Republic of China · Education Department of Jiangxi Province · National Natural Science Foundation of China · Natural Science Foundation of Jiangxi Province · Chinese Academy of Sciences

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