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Transformation from crystalline precursor to perovskite in PbCl2-derived MAPbI3
Kevin H Stone1, Aryeh Gold-Parker1,2, Vanessa L Pool1
1SSRL Materials Science Division, SLAC National Accelerator Laboratory, 2575 Sand Hill Rd MS 69, Menlo Park, California, 94025, USA.
Nature Communications
|August 29, 2018
Summary
Researchers uncovered the crystalline precursor, methylammonium chloro-triiodoplumbate (MA2PbI3Cl), in methylammonium lead iodide (MAPbI3) perovskite formation. Its slow conversion, regulated by methylammonium chloride evaporation, enhances film quality for optoelectronic devices.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Metal halide perovskites are crucial for advanced optoelectronic devices.
- Optimizing perovskite formation chemistry is essential for device performance.
- Methylammonium lead iodide (MAPbI3) is a leading perovskite material.
Purpose of the Study:
- To elucidate the crystalline precursor structure in MAPbI3 formation.
- To understand the chemical mechanisms governing perovskite conversion.
- To correlate precursor chemistry with film properties and device potential.
Main Methods:
- Single-step deposition of lead chloride (PbCl2) and methylammonium iodide (MAI).
- X-ray diffraction and microscopy to analyze film composition and structure.
- In-situ monitoring of precursor-to-perovskite transformation.
Main Results:
- Identified crystalline MA2PbI3Cl as the precursor phase.
- Observed coexistence of MA2PbI3Cl with disordered methylammonium chloride (MACl).
- Demonstrated that MACl evaporation self-regulates and slows perovskite conversion.
Conclusions:
- The stable MA2PbI3Cl precursor facilitates dense film formation.
- Slow conversion due to MACl evaporation promotes improved crystal quality.
- This chemical insight enables rational control over film deposition for superior optoelectronic devices.
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