High-Hole-Mobility Metal–Organic Framework as Dopant-Free Hole Transport Layer for Perovskite Solar Cells

  • Ruonan Wang (Creator)
  • Weikang Yu (Creator)
  • Cheng Sun (Creator)
  • Kashi Chiranjeevulu (Creator)
  • Shuguang Deng (Creator)
  • Jiang Wu (Creator)
  • Feng Yan (Creator)
  • Changsi Peng (Creator)
  • Yanhui Lou (Creator)
  • Gang Xu (Creator)
  • Guifu Zou (Creator)
  • Jiang Wu (Creator)



Abstract A dopant-free hole transport layer with high mobility and a low-temperature process is desired for optoelectronic devices. Here, we study a metal–organic framework material with high hole mobility and strong hole extraction capability as an ideal hole transport layer for perovskite solar cells. By utilizing lifting-up method, the thickness controllable floating film of Ni3(2,3,6,7,10,11-hexaiminotriphenylene)2 at the gas–liquid interface is transferred onto ITO-coated glass substrate. The Ni3(2,3,6,7,10,11-hexaiminotriphenylene)2 film demonstrates high compactness and uniformity. The root-mean-square roughness of the film is 5.5 nm. The ultraviolet photoelectron spectroscopy and the steady-state photoluminescence spectra exhibit the Ni3(HITP)2 film can effectively transfer holes from perovskite film to anode. The perovskite solar cells based on Ni3(HITP)2 as a dopant-free hole transport layer achieve a champion power conversion efficiency of 10.3%. This work broadens the application of metal–organic frameworks in the field of perovskite solar cells. Graphical Abstract
Date made available2022

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