Phase-heterojunction all-inorganic perovskite solar cells surpassing 21.5% efficiency

Sawanta S. Mali, Jyoti V. Patil, Jiang Yang Shao, Yu Wu Zhong, Sachin R. Rondiya, Nelson Y. Dzade, Chang Kook Hong

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Making organic–inorganic metal halide-based multijunction perovskite solar cells either by solution processes or physical techniques is not straightforward. Here we propose and developed dimethylammonium iodide-assisted β−CsPbI3 and guanidinium iodide-assisted γ−CsPbI3 all-inorganic phase-heterojunction solar cells (PHSs) by integrating hot-air and triple-source thermal evaporation deposition techniques, respectively. Incorporating a (Zn(C6F5)2) molecular additive and dopant-free hole transport layer produces a 21.59% power conversion efficiency (PCE). The laboratory-to-module scale shows 18.43% PCE with an 18.08 cm2 active area. We demonstrate that this additive-assisted β−γ-based PHS structure exhibited >200 hours of stable performance under maximum power tracking under one sun illumination. This work paves the way towards dual deposition techniques for PHS with important consequences not only for all inorganic but also for other halide perovskite compositions.

Original languageEnglish (US)
Pages (from-to)989-1001
Number of pages13
JournalNature Energy
Issue number9
StatePublished - Sep 2023

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology

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