English

UV Photodetectors Based on High Quality CsPbCl₃ Film Prepared by a Two-Step Diffusion Method

• Wu Jionghua ^1,3, ,
• Li Yiming ^1,3, ,
• Shi Jiangjian ^1, ,
• Wu Huijue ^1, ,
• Luo Yanhong ^1,3,4, ,
• Li Dongmei ^1,3,4, ,
• Meng Qingbo ^{1,2,4, ,}

• 1.

  Key Laboratory for Renewable Energy (CAS), Beijing Key Laboratory for New Energy Materials and Devices, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing 100190, China

• 2.

  Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

• 3.

  School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

• 4.

  Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong Province, China

Corresponding author: Qingbo Meng, Email: qbmeng@iphy.ac.cn

• Received Date: 13 April 2020
  Accepted Date: 07 May 2020
  Revised Date: 02 May 2020
  Available Online: 15 April 2021
• Fund Project:

  The project was supported by the National Key R & D Program of China (2018YFB1500101), the National Natural Science Foundation of China (11874402, 51421002, 51627803, 91733301, 51761145042, 51872321) and the International Partnership Program of Chinese Academy of Sciences (112111KYSB20170089)

Abstract: Visible-blind ultra-violet (UV) photodetectors have great application prospects in military and civilian fields. Hence, it is important to develop high-efficiency UV photodetectors. Perovskite materials have been widely applied in many fields, such as solar cells, light-emitting diodes, and photodetectors, owing to their excellent optical properties. The CsPbCl₃ perovskite has a great potential in visible-blind UV photodetectors owing to its stable chemical properties and a suitable band gap. However, due to the extremely poor precursor solubility of CsPbCl₃, it is difficult to find a suitable solvent to prepare CsPbCl₃ films. In this study, we developed a two-step diffusion method to prepare CsPbCl₃ films. PbCl₂ and CsCl were dissolved in different solvents to overcome the solubility problem of CsPbCl₃. First, the PbCl₂ film was spin coated on a soda-lime glass. The CsCl solution was then continually dropwise spin-coated on the PbCl₂ film to form the CsPbCl₃ film. By controlling the morphology of PbCl₂ through different annealing temperatures, the influence of different PbCl₂ precursor films on microstructure of the CsPbCl₃ film was investigated. The X-ray diffraction and scanning electron microscopy profiles of the PbCl₂ precursor film and the CsPbCl₃ film suggested that when the annealing temperature was too low, excess dimethyl sulfoxide (DMSO) remained in the PbCl₂ precursor film, which hindered the transformation of CsPbCl₃. However, when the annealing temperature was too high, voids appeared in the CsPbCl₃ film due to excess DMSO volatilization, which caused pinholes in the CsPbCl₃ film. Finally, a pinhole-free, smooth CsPbCl₃ film with full grains was obtained when PbCl₂ was annealed at 80 ℃. To the best of our knowledge, this is the first time a high-quality CsPbCl₃ film with 1 μm grains was prepared using a two-step diffusion method. Photoelectrical characterizations, such as ultraviolet-visible absorption, steady-state photoluminescence (PL), and time-resolved PL characterizations, were studied to evaluate the quality of the film. The as-prepared CsPbCl₃ film had strong UV absorption and PL intensity, and its longer PL lifetime indicated that the film had fewer defect states. Furthermore, a UV photodetector with a lateral structure based on the CsPbCl₃ film was fabricated. The related electrical characterizations, such as current voltage curves, showed a good responsivity of 0.75 A·W^-1 and an outstanding detectivity of 7.8 × 10¹² Jones, which are better than those of contemporary commercial photodetectors. The findings of this study show that a two-step diffusion method can be used to prepare CsPbCl₃ films with better features and that it has a great potential in the development of UV photodetectors in the future.

Key words:
• CsPbCl₃
•  /  Ultraviolet photodetector
•  /  Two-step method
•  /  Perovskite film
•  /  High quality

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