Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (5): 50103-050103.doi: 10.11889/j.0253-3219.2018.hjs.41.050103


Solvent engineering during the preparation of perovskite thin films in air

ZHANG Xiaonan1,2, ZHENG Guanhaojie1,2, SU Zhenhuang1,2, HAN Yujie1,3, YANG Yingguo1,4, GAO Xingyu1,4   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Zhangjiang Campus, Shanghai 201204, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Institute of Functional Nano and Soft Materials, Soochow University, Suzhou 215123, China;
    4. Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2018-02-28 Revised:2018-03-08 Online:2018-05-10 Published:2018-05-08
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11175239, No.U1632265, No.11605278, No.11675252)

Abstract: [Background] The quality of the organolead halide layers in perovskite solar cells (PSCs) largely determines the performances of their device such as power conversion efficiency (PCE). Among a variety of preparation methods developed, one step solution spin coating is currently the most popular but a simple and effective preparation technique to fabricate high quality perovskite thin films. [Purpose] The quality of the perovskite films depends strongly on the detailed preparation procedures. This paper aims to study the influence of solvent engineering during the preparation of the perovskite thin films especially on their crystallinity and thermal degradation. [Methods] There were four different perovskite films prepared in this study:one without any solvent engineering, one with dimethyl sulphoxide (DMSO) added in the precursor solution, one with antisolvent treatment by using ether, and one with both DMSO added and antisolvent treatment. The morphology and crystallinity of the thin films were studied by scanning electron microscopy (SEM) and synchrotron-based grazing incidence X-ray diffraction (GIXRD), respectively. The PSC performances were characterized by current density-voltage test. Moreover, the evolutions of crystallinity of the fabricated perovskite films during an in-situ heating experiment were monitored by GIXRD in air to study their crystallization and degradation. [Results] DMSO has little effects on the surface morphology and device performance, but postpones the perovskite crystallization process. The antisolvent promotes forming uniform dense films leading to high performance PSC and improves thermal structural stability. [Conclusion] In one step spin coating, high quality thin films can be obtained quickly and effectively by an antisolvent treatment.

Key words: Perovskite solar cells, Solvent engineering, Synchrotron-based GIXRD, In-situ

CLC Number: 

  • TL99