Low-dimensional phases engineering for improving the emission efficiency and stability of quasi-2D perovskite films

doi:10.1088/1674-1056/abe92b

中国物理B ›› 2021, Vol. 30 ›› Issue (6): 67802-067802.doi: 10.1088/1674-1056/abe92b

Low-dimensional phases engineering for improving the emission efficiency and stability of quasi-2D perovskite films

Yue Wang(王月), Zhuang-Zhuang Ma(马壮壮), Ying Li(李营), Fei Zhang(张飞), Xu Chen(陈旭)^‡, and Zhi-Feng Shi (史志锋)^†

Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China

收稿日期:2021-01-14 修回日期:2021-02-19 接受日期:2021-02-24 出版日期:2021-05-18 发布日期:2021-05-27
通讯作者: Xu Chen, Zhi-Feng Shi E-mail:shizf@zzu.edu.cn;xchen@zzu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774318, 12074347, 12004346, and 61935009) and the Open Fund of State Key Laboratory of Integrated Optoelectronics (Grant No. IOSKL2020KF04).

Low-dimensional phases engineering for improving the emission efficiency and stability of quasi-2D perovskite films

Yue Wang(王月), Zhuang-Zhuang Ma(马壮壮), Ying Li(李营), Fei Zhang(张飞), Xu Chen(陈旭)^‡, and Zhi-Feng Shi (史志锋)^†

Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China

Received:2021-01-14 Revised:2021-02-19 Accepted:2021-02-24 Online:2021-05-18 Published:2021-05-27
Contact: Xu Chen, Zhi-Feng Shi E-mail:shizf@zzu.edu.cn;xchen@zzu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774318, 12074347, 12004346, and 61935009) and the Open Fund of State Key Laboratory of Integrated Optoelectronics (Grant No. IOSKL2020KF04).

摘要/Abstract

摘要： The two-dimensional (2D) Ruddlesden-Popper-type perovskites, possessing tunable bandgap, narrow light emission, strong quantum confinement effect, as well as a simple preparation method, are identified as a new generation of candidate materials for efficient light-emitting diodes. However, the preparation of high-quality quasi-2D perovskite films is still a challenge currently, such as the severe mixing of phases and a high density of defects within the films, impeding the further promotion of device performance. Here, we prepared the quasi-2D PEA₂MA_n-1Pb_nBr_3n+1 perovskite films by a modified spin-coating method, and the phases with large bandgap were effectively suppressed by the vacuum evaporation treatment. We systematically investigated the optical properties and stability of the optimized films, and the photoluminescence (PL) quantum yield of the treated films was enhanced from 23% to 45%. We also studied the emission mechanisms by temperature-dependent PL spectra. Moreover, the stability of films against moisture, ultraviolet light, and heat was also greatly improved.

关键词: quasi-2D perovskite films, vacuum evaporation, optical properties, stability

Abstract: The two-dimensional (2D) Ruddlesden-Popper-type perovskites, possessing tunable bandgap, narrow light emission, strong quantum confinement effect, as well as a simple preparation method, are identified as a new generation of candidate materials for efficient light-emitting diodes. However, the preparation of high-quality quasi-2D perovskite films is still a challenge currently, such as the severe mixing of phases and a high density of defects within the films, impeding the further promotion of device performance. Here, we prepared the quasi-2D PEA₂MA_n-1Pb_nBr_3n+1 perovskite films by a modified spin-coating method, and the phases with large bandgap were effectively suppressed by the vacuum evaporation treatment. We systematically investigated the optical properties and stability of the optimized films, and the photoluminescence (PL) quantum yield of the treated films was enhanced from 23% to 45%. We also studied the emission mechanisms by temperature-dependent PL spectra. Moreover, the stability of films against moisture, ultraviolet light, and heat was also greatly improved.

Key words: quasi-2D perovskite films, vacuum evaporation, optical properties, stability

中图分类号: (Semiconductors)

78.40.Fy

78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

Yue Wang(王月), Zhuang-Zhuang Ma(马壮壮), Ying Li(李营), Fei Zhang(张飞), Xu Chen(陈旭), and Zhi-Feng Shi (史志锋). Low-dimensional phases engineering for improving the emission efficiency and stability of quasi-2D perovskite films[J]. 中国物理B, 2021, 30(6): 67802-067802.

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Low-dimensional phases engineering for improving the emission efficiency and stability of quasi-2D perovskite films

Low-dimensional phases engineering for improving the emission efficiency and stability of quasi-2D perovskite films

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