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Controlled Nucleation and Crystallization for Efficient Solution-Processed CIGS Solar Cells.

Shaocong Yan1, Shuwen Lou1, Shengjie Yuan1

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ACS Applied Materials & Interfaces
|October 27, 2025
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Summary

A new preannealing method improves copper indium gallium selenide (CIGS) solar cells made with solution processing. This strategy optimizes film quality, leading to higher power conversion efficiency (PCE) for cost-effective photovoltaics.

Keywords:
CIGS solar cellscrystallinitydefect passivationnucleation sitessolution-processed method

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Solution-processed CIGS solar cells offer a cost-effective alternative to traditional photovoltaic methods.
  • These cells suffer from lower power conversion efficiency (PCE) compared to vacuum-deposited cells due to inferior film quality and different growth mechanisms.

Purpose of the Study:

  • To develop a novel preannealing strategy for CIGS precursor films.
  • To regulate the nucleation and crystallization pathways for improved film quality.
  • To enhance the performance of solution-processed CIGS solar cells.

Main Methods:

  • Implementation of a preannealing step for the CIGS precursor film.
  • Characterization of film morphology, crystallinity, and defect density.
  • Optimization of the preannealing process to control nucleation and grain growth.

Main Results:

  • Preannealing enlarged nucleation sizes and reduced nucleation sites, promoting grain growth.
  • Achieved high-quality CIGS absorbers with compact morphology, enhanced crystallinity, and fewer defects.
  • Optimized CIGS solar cells demonstrated a PCE of 17.51%, a leading value for solution-processed devices.

Conclusions:

  • The proposed preannealing strategy effectively regulates nucleation and crystallization in solution-processed CIGS films.
  • This approach significantly improves film quality and solar cell performance.
  • Provides a framework for optimizing growth to achieve high-performance, solution-processed chalcopyrite photovoltaics.