Ferroelectric Ba0.75Sr0.25TiO3 tunable charge transfer in perovskite devices

doi:10.1088/1674-1056/ac46c3

中国物理B ›› 2022, Vol. 31 ›› Issue (5): 57202-057202.doi: 10.1088/1674-1056/ac46c3

Ferroelectric Ba_0.75Sr_0.25TiO₃ 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

收稿日期:2021-11-14 修回日期:2021-12-18 出版日期:2022-05-14 发布日期:2022-04-18
通讯作者: 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
基金资助:
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).

Ferroelectric Ba_0.75Sr_0.25TiO₃ 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

Received:2021-11-14 Revised:2021-12-18 Online:2022-05-14 Published:2022-04-18
Contact: 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
About author:2021-12-29
Supported by:
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).

1. 附件.pdf(767KB)

摘要/Abstract

摘要： Interfacial charge recombination is a main issue causing the efficiency loss of the perovskite solar cells (PSCs). Here, ferroelectric Ba_0.75Sr_0.25TiO₃ (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.

关键词: ferroelectric polarization, charge transfer, density-functional theory, perovskite solar cell

Abstract: Interfacial charge recombination is a main issue causing the efficiency loss of the perovskite solar cells (PSCs). Here, ferroelectric Ba_0.75Sr_0.25TiO₃ (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.

Key words: ferroelectric polarization, charge transfer, density-functional theory, perovskite solar cell

中图分类号: (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)

77.84.-s

34.70.+e (Charge transfer) 88.40.hj (Efficiency and performance of solar cells)

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 Ba_0.75Sr_0.25TiO₃ tunable charge transfer in perovskite devices[J]. 中国物理B, 2022, 31(5): 57202-057202.

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Ferroelectric Ba_0.75Sr_0.25TiO₃ tunable charge transfer in perovskite devices

Ferroelectric Ba_0.75Sr_0.25TiO₃ tunable charge transfer in perovskite devices

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