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Solvent Engineering Using a Volatile Solid for Highly Efficient and Stable Perovskite Solar Cells.

Guohua Wu1, Hua Li1, Jian Cui1

  • 1Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Laboratory for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China.

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Summary
This summary is machine-generated.

A novel method using volatile glycolic acid (GA) effectively regulates perovskite film crystallinity for high-efficiency perovskite solar cells (PSCs). GA modification enhances power conversion efficiency (PCE) and device stability.

Keywords:
crystal growthperovskite solar cellspinholessolvent engineeringvolatile

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Chemical Engineering

Background:

  • Perovskite solar cells (PSCs) offer promising photovoltaic performance.
  • Controlling perovskite film crystallinity is crucial for device efficiency and stability.
  • Current additive strategies often leave residues or lack optimal volatility.

Purpose of the Study:

  • To develop a novel strategy for regulating perovskite film crystallinity using a volatile additive.
  • To investigate the impact of volatile glycolic acid (GA) on the formation and properties of FA$_{0.85}$MA$_{0.15}$PbI$_{3}$ perovskite films.
  • To compare the performance and stability of GA-modified PSCs with control and non-volatile additive (TGA) modified devices.

Main Methods:

  • Incorporation of volatile solid glycolic acid (GA) into the perovskite precursor solution.
  • Controlled sublimation of GA during the dimethyl sulfoxide (DMSO) sublimation process.
  • Characterization of perovskite film morphology, crystallinity, and defect density.
  • Fabrication and performance testing of PSC devices, including power conversion efficiency (PCE) measurements.
  • Stability testing under light, thermal, and humidity stress.

Main Results:

  • GA effectively regulated perovskite crystallinity without residual impurities.
  • GA modification led to improved film formation with strong interaction between GA and Pb$^{2+}$ ions.
  • A champion PCE of 21.32% was achieved for GA-modified PSCs, significantly outperforming control and TGA-based devices.
  • GA-modified PSCs demonstrated superior stability under various environmental stress conditions.

Conclusions:

  • Volatile GA is an effective additive for controlling perovskite film quality and enhancing PSC performance.
  • The proposed GA strategy offers a pathway to high-efficiency and stable perovskite solar cells.
  • The volatility of the additive plays a critical role in achieving optimal perovskite film formation and device characteristics.