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journal article·2020-08Open access

Quasi‐Heteroface Perovskite Solar Cells

Ningyu Ren, Bingbing Chen, Biao Shi, Pengyang Wang, Qiaojing Xu, Yucheng Li, Renjie Li, Xinghua Cui, Fuhua Hou, Tiantian Li, Qian Huang, Yuelong Li, Yi Ding, Guofu Hou, Xinliang Chen, Chengjun Zhu, Ying Zhao, Anders Hagfeldt, Xiaodan Zhang

Small· Volume 16· Issue 34
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Source abstract

Abstract

Abstract Perovskite solar cells (PSCs) have attracted unprecedented attention due to their rapidly rising photoelectric conversion efficiency (PCE). In order to further improve the PCE of PSCs, new possible optimization path needs to be found. Here, quasi‐heteroface PSCs (QHF‐PSCs) is designed by a double‐layer perovskite film. Such brand new PSCs have good carrier separation capabilities, effectively suppress the nonradiative recombination of the PSCs, and thus greatly improve the open‐circuit voltage and PCE. The root cause of the performance improvement is the benefit from the additional built‐in electric field, which is confirmed by measuring the external quantum efficiency under applied electric field and Kelvin probe force microscope. Meanwhile, an intermediate band gap perovskite layer can be obtained simply by combining a wide band gap perovskite layer with a narrow band gap perovskite layer. Tunability of the band gap is obtained by varying the film thicknesses of the narrow and wide band gap layers. This phenomenon is quite different from traditional inorganic solar cells, whose band gap is determined only by the narrowest band gap layer. It is believed that these QHF‐PSCs will be an effective strategy to further enhance PCE in PSCs and provide basis to further understand and develop the perovskite materials platform.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · 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 of Nankai University Tianjin 300350 P. R. China

Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Nankai University Tianjin 300350 P. R. China

Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 P. R. China

Renewable Energy Conversion and Storage Center of Nankai University Tianjin 300072 P. R. China

School of Physical Science and Technology Inner Mongolia University, Key Laboratory of Semiconductor Inner Mongolia University Hohhot 010021 P. R. China

Engineering Research Center of Thin Film Photoelectronic Technology Ministry of Education Nankai University Tianjin 300350 P. R. China

Photovoltaic Technology at Universities of Inner Mongolia Autonomous Region Inner Mongolia University Hohhot 010021 P. R. China

Laboratory of Photomolecular Science Institute of Chemical Sciences Engineering Ecole Polytechnique Fedérale de Lausanne (EPFL) Lausanne 1015 Switzerland

Funding

National Basic Research Program of China · National Natural Science Foundation of China · Overseas Expertise Introduction Project for Discipline Innovation

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