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Cesium Lead Iodide Perovskites: Optically Active Crystal Phase Stability to Surface Engineering.

Yixi Wang1, Hairong Zhao1, Marek Piotrowski1

  • 1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China.

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Summary

Cesium lead iodide (CsPbI3) solar cells show promise but suffer from poor stability due to lattice issues. Engineering the CsPbI3 surface and lattice, particularly through nanocrystal passivation, enhances stability and performance for light applications.

Keywords:
CsPbI3 NCscesium lead iodidesdefect-tolerancehot-injection methodion exchangesperovskite crystal structuresperovskite stabilityphotoluminescencesolar cellsurface engineering

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Photovoltaics

Background:

  • Cesium lead iodide (CsPbI3) perovskites are researched for solar cells due to their all-inorganic nature and performance.
  • Poor stability in CsPbI3 devices is linked to lattice deviations and environmental factors like temperature.
  • Unlike hybrid perovskites, CsPbI3 stability can be improved through surface and lattice engineering.

Purpose of the Study:

  • To review fundamental aspects of CsPbI3 polymorphs, focusing on stability and phase transformations.
  • To explore surface and lattice engineering strategies for enhancing CsPbI3 stability and performance.
  • To summarize recent advances in CsPbI3 synthesis, passivation, and solar cell applications.

Main Methods:

  • Survey of CsPbI3 polymorph structures, stability factors (temperature, polarity, size), and electronic band structure.
  • Investigation of surface passivation techniques using molecular links and inorganic halides.
  • Review of synthetic protocols and purification methods for CsPbI3 nanocrystals.
  • Analysis of CsPbI3 solar cell device performance based on fabrication methods.

Main Results:

  • CsPbI3's stability is primarily governed by surface and lattice properties, unlike organic-inorganic hybrids.
  • Size reduction and surface passivation are key to stabilizing desired CsPbI3 phases and improving photoluminescence quantum yield.
  • Efficient synthetic and passivation methods yield optically active CsPbI3 nanocrystals suitable for solar cells.

Conclusions:

  • Surface and lattice engineering are crucial for overcoming CsPbI3 instability.
  • Advanced passivation techniques and optimized synthesis protocols enhance the performance of CsPbI3-based solar cells.
  • Further development in CsPbI3 nanocrystal engineering is vital for superior optical and light applications.