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Chin. Phys. B, 2021, Vol. 30(6): 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
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 PEA2MAn-1PbnBr3n+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.
Keywords:  quasi-2D perovskite films      vacuum evaporation      optical properties      stability  
Received:  14 January 2021      Revised:  19 February 2021      Accepted manuscript online:  24 February 2021
PACS:  78.40.Fy (Semiconductors)  
  78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)  
Fund: 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).
Corresponding Authors:  Xu Chen, Zhi-Feng Shi     E-mail:;

Cite this article: 

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 2021 Chin. Phys. B 30 067802

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