High-performance hole-extraction layer of sol-gel-processed nio nanocrystals for inverted planar perovskite solar cells

Zonglong Zhu, Yang Bai, Teng Zhang, Zhike Liu, Xia Long, Zhanhua Wei, Zilong Wang, Lixia Zhang, Jiannong Wang, Feng Yan, Shihe Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

322 Citations (Scopus)


Hybrid organic/inorganic perovskite solar cells have been rapidly evolving with spectacular successes in both nanostructured and thin-film versions. Herein, we report the use of a simple sol-gel-processed NiO nanocrystal (NC) layer as the hole-transport layer in an inverted perovskite solar cell. The thin NiO NC film with a faceted and corrugated surface enabled the formation of a continuous and compact layer of well-crystallized CH33NH3PbI3in a two-step solution process. The hole-extraction and -transport capabilities of this film interfaced with the CH3NH33PbI3film were higher than those of organic PEDOT:PSS layers. The cell with a NiO NC film with a thickness of 30-40 nm exhibited the best performance, as a thinner layer led to a higher leakage current, whereas a thicker layer resulted in a higher series resistance. With the NiO film, we observed a cell efficiency of 9.11%, which is by far the highest reported for planar perovskite solar cells based on an inorganic hole-extracting layer.
Original languageEnglish
Pages (from-to)12571-12575
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number46
Publication statusPublished - 10 Nov 2014


  • Energy conversion
  • Inorganic hole-extraction layers
  • NiO nanocrystals
  • Organic-inorganic hybrid composites
  • Perovskite solar cells

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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