| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Ferroelectric Ba0.75Sr0.25TiO3 tunable charge transfer in perovskite devices |
| Zi-Xuan Chen(陈子轩), Jia-Lin Sun(孙家林), Qiang Zhang(张强), Chong-Xin Qian(钱崇鑫), Ming-Zi Wang(王明梓)†, and Hong-Jian Feng(冯宏剑)‡ |
| School of Physics, Northwest University, Xi'an 710127, China |
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Abstract Interfacial charge recombination is a main issue causing the efficiency loss of the perovskite solar cells (PSCs). Here, ferroelectric Ba0.75Sr0.25TiO3 (BST) is introduced as a polarization tunable layer to promote the interfacial charge transfer of the PSCs. The coexistence of ferroelectric polarization and charge carriers in BST is confirmed by density functional theory (DFT) calculations. Experimental characterization demonstrates the polarization reversal and the existence of domain in BST film. The BST film conductivity is tested as 2.98×10-4 S/cm, which is comparable to the TiO2 being used as the electron transporting layer (ETL) in PSCs. The calculations results prove that BST can be introduced into the PSCs and the interfacial charge transfer can be tuned by ferroelectric polarization. Thus, we fabricated the BST-based PSCs with a champion power conversion efficiency (PCE) of 19.05% after poling.
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Received: 14 November 2021
Revised: 18 December 2021
Accepted manuscript online:
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PACS:
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77.84.-s
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(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
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34.70.+e
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(Charge transfer)
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31.15.E-
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88.40.hj
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(Efficiency and performance of solar cells)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.51972266,51672214,and 11904286) and the Natural Science Basic Research Program of Shaanxi Province,China (Grant No.2022JZ-01). |
Corresponding Authors:
Ming-Zi Wang,E-mail:mzwang@nwu.edu.cn;Hong-Jian Feng,E-mail:hjfeng@nwu.edu.cn
E-mail: mzwang@nwu.edu.cn;hjfeng@nwu.edu.cn
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| About author: 2021-12-29 |
Cite this article:
Zi-Xuan Chen(陈子轩), Jia-Lin Sun(孙家林), Qiang Zhang(张强), Chong-Xin Qian(钱崇鑫), Ming-Zi Wang(王明梓), and Hong-Jian Feng(冯宏剑) Ferroelectric Ba0.75Sr0.25TiO3 tunable charge transfer in perovskite devices 2022 Chin. Phys. B 31 057202
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