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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
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Melt-Processed Halide Perovskite Thin Films from a Two-Dimensional Ruddlesden-Popper Phase Precursor
Atefe Hadi1, Rainie L Schlichtmann1, Matthew I Milot1
1Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States.
The Journal of Physical Chemistry Letters
|May 31, 2023
Summary
This study developed a method to create halide perovskite thin films without hazardous solvents. Melt-processable precursors are used, enabling greener, cost-effective manufacturing for optoelectronics.
Area of Science:
- Materials Science
- Chemical Engineering
- Optoelectronics
Background:
- Halide perovskite thin films offer significant potential for photovoltaics and optoelectronics.
- The commercialization of perovskite technology is hindered by the use of hazardous solvents in deposition and processing.
Purpose of the Study:
- To demonstrate a method for depositing halide perovskite thin films without environmentally hazardous solvents.
- To enable inexpensive, industrial-scale liquid-phase deposition processes for perovskites.
Main Methods:
- Deposition of melt-processable wide-bandgap layered perovskites [(C6H5CH(CH3)CH2NH3)2PbI4:β-Me-PEA2PbI4] via blade coating at ~210 °C.
- Transformation of β-Me-PEA2PbI4 films into methylammonium or formamidinium lead iodide films through cation exchange in an alcohol-based solvent.
- Exploration of a completely solvent-free approach using solid-state transformation.
Main Results:
- Successful deposition of perovskite precursors using a melt-processing technique.
- Achieved transformation into desired perovskite phases (methylammonium or formamidinium lead iodide) via cation exchange.
- Demonstrated the feasibility and limitations of a solvent-free solid-state transformation method.
Conclusions:
- This work presents a significant advancement in eliminating hazardous solvents from perovskite thin film production.
- The developed method paves the way for cost-effective and environmentally friendly industrial-scale manufacturing of perovskite optoelectronics.
