Simultaneous dual-interface and bulk defect passivation for high-efficiency and stable CsPbI2Br perovskite solar cells

Huan Zhao, Zhuo Xu, Yuhang Che, Yu Han, Shaomin Yang, Chenyang Duan, Jian Cui, Songyuan Dai, Zhike Liu, Shengzhong (Frank) Liu

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

All-inorganic CsPbI2Br is a promising candidate to produce the optimized balance between efficiency and stability. Unfortunately, the CsPbI2Br perovskite films prepared by solution methods often show numerous defects on the grain surfaces and a tendency for phase transition. In this work, we discovered that the proper amount of NiI2 additive enables Ni2+ doping in the perovskite interstitial lattice, while additional Ni2+ ions serve as passivation agents on the grain surfaces; in particular, a profiled distribution appears from the film bulk to both the upper and lower surfaces. The special Ni2+ distribution results in an optimized TiO2 surface for perovskite growth, better perovskite film quality, superior charge extraction capability, and effective suppression of interfacial recombination. As a result, the CsPbI2Br perovskite solar cell (PSC) efficiency is increased to 15.88%, among the highest for its type. Also, the special Ni2+ distribution endows the PSC with improved moisture tolerance. This work provides a promising strategy to overcome the surface/bulk instability issues common in PSCs.
Original languageEnglish (US)
JournalJournal of Power Sources
Volume492
DOIs
StatePublished - Apr 30 2021
Externally publishedYes

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering
  • Renewable Energy, Sustainability and the Environment

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