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An Intermediate-Aided Perovskite Phase Purification for High-Performance Solar Cells.

Jinghao Ge1, Yiru Huang2, Xuexiao Chen2

  • 1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education; Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Lab for Advanced Energy Technology; International Joint Research Center of Shaanxi Province for Photoelectric Materials Science; Institute for Advanced Energy Materials; School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710119, China.

Journal of the American Chemical Society
|December 31, 2024
PubMed
Summary

Aminoguanidine hydrochloride (AG) stabilizes the efficient alpha phase in perovskite solar cells (PSCs) by forming a novel intermediate phase. This significantly boosts PSC efficiency and long-term operational stability.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Crystallography

Background:

  • Perovskite solar cells (PSCs) are promising for next-generation photovoltaics.
  • Structural stability, particularly achieving the pure α-phase of formamidine lead iodide (α-FAPbI3), is critical for PSC operational reliability.
  • The thermodynamically favored δ-FAPbI3 phase hinders pure α-phase crystallization.

Purpose of the Study:

  • To develop a machine learning approach for identifying additives that promote α-phase purification in PSCs.
  • To investigate the potential of aminoguanidine (AG) hydrochloride as an additive for enhancing perovskite phase stability and device performance.

Main Methods:

  • Utilized a language machine learning approach to analyze approximately 106 scientific abstracts.
  • Identified aminoguanidine (AG) hydrochloride as a promising additive for intermediate phase formation.
  • Conducted experimental validation to confirm the formation of a novel one-dimensional intermediate phase (AGPbI3).

Main Results:

  • AG forms a novel 1D intermediate phase (AGPbI3), suppressing undesired δ-phase and solvent intermediate formation.
  • Pure α-phase crystallization was promoted, leading to increased solar cell efficiency from 23.99% to 25.46%.
  • Enhanced long-term thermal and photostability, retaining 82% efficiency after 1056 h at 85 °C and 94.6% after 835 h illumination.
  • Improved flexible PSC efficiency from 21.24% to 22.86%.

Conclusions:

  • Aminoguanidine hydrochloride is an effective additive for stabilizing the α-phase in perovskite solar cells.
  • The developed machine learning strategy offers a rapid method for exploring new intermediate phases to improve thin-film solar cell performance and stability.