J. Mater. Sci. Technol. ›› 2025, Vol. 207: 24-33.DOI: 10.1016/j.jmst.2024.04.031

• Research article • Previous Articles     Next Articles

Uniaxial alignment of perovskite nanowires via brush painting technique for efficient flexible polarized photodetectors

Mi Kyong Kima,1, Su Min Parkb,1, Haedam Jina,1, Jeongbeom Chaa, Dohun Baekb, Tae Oh Yoonb, Gibaek Leeb, Se Gyo Hanc, Sae Byeok Jod, Seok Joo Yange, Min Kima,b,f,*   

  1. aGraduate School of Integrated Energy-AI, Jeonbuk National University, Jeonju 54896, Republic of Korea;
    bSchool of Chemical Engineering, Clean Energy Research Center, Jeonbuk National University, Jeonju 54896, Republic of Korea;
    cDepartment of Chemical Engineering, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea;
    dSchool of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea;
    eDavidson School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, United States;
    fDepartment of JBNU-KIST, Industry-Academia Convergence Research, Jeonju 54896, Republic of Korea
  • Received:2024-03-07 Revised:2024-04-14 Accepted:2024-04-14 Published:2025-02-01 Online:2024-05-08
  • Contact: *E-mail address: minkim@jbnu.ac.kr (M. Kim)
  • About author:1 These authors contributed equally to this work.

Abstract: A polarization-sensitive and flexible photodetector was fabricated through the precise alignment of perovskite nanowires (NWs) using a brush coating technique. The alignment of the NWs was meticulously examined, considering various chemical properties of the solvent, such as boiling point, viscosity, and surface tension. Notably, when the NWs were brush-coated with toluene dispersion, the NWs were aligned in higher order than those processed from octane dispersion. The degree of alignment was correlated with the photodetector property. Especially, the well-aligned NW photodetector exhibited a two-fold disparity in current response contingent on the polarization direction. Furthermore, even after enduring 500 bending cycles, the device retained 80 % of its photodetector performance. This approach underscores the potential of solution-processed flexible photodetectors for advanced optical applications under dynamic operating conditions.

Key words: Perovskite photodetectors, Perovskite nanowires, Brush coating technique, Aligned nanowires