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Constructing Chromium Multioxide Hole-Selective Heterojunction for High-Performance Perovskite Solar Cells.

Sheng JiangShaobing XiongWei DongDanqin LiYuting YanMenghui JiaYannan DaiQingbiao ZhaoKai JiangXianjie LiuLiming DingMats FahlmanZhenrong SunQinye Bao
Published in: Advanced science (Weinheim, Baden-Wurttemberg, Germany) (2022)
Perovskite solar cells (PSCs) suffer from significant nonradiative recombination at perovskite/charge transport layer heterojunction, seriously limiting their power conversion efficiencies. Herein, solution-processed chromium multioxide (CrO x ) is judiciously selected to construct a MAPbI 3 /CrO x /Spiro-OMeTAD hole-selective heterojunction. It is demonstrated that the inserted CrO x not only effectively reduces defect sites via redox shuttle at perovskite contact, but also decreases valence band maximum (VBM)-HOMO offset between perovskite and Spiro-OMeTAD. This will diminish thermionic losses for collecting holes and thus promote charge transport across the heterojunction, suppressing both defect-assisted recombination and interface carrier recombination. As a result, a remarkable improvement of 21.21% efficiency with excellent device stability is achieved compared to 18.46% of the control device, which is among the highest efficiencies for polycrystalline MAPbI 3 based n-i-p planar PSCs reported to date. These findings of this work provide new insights into novel charge-selective heterojunctions for further enhancing efficiency and stability of PSCs.
Keyphrases
  • perovskite solar cells
  • solar cells
  • dna repair
  • dna damage
  • room temperature
  • high efficiency
  • signaling pathway
  • soft tissue