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

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

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


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: [Figure not available: see fulltext.].

Original languageEnglish (US)
Article number6
JournalNanoscale Research Letters
Issue number1
StatePublished - 2022


  • Dopant-free hole transport materials
  • High hole mobility
  • Metal–organic frameworks
  • Ni(2,3,6,7,10,11-hexaiminotriphenylene)
  • Perovskite solar cells

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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