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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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Defect Engineering and Emission Tuning of Wide-Bandgap MAPbCl3 Perovskite
Zihao Li1, Yuqing Luo1, Zelong Chen1
1School of Materials, Shenzhen Campus of Sun Yat-Sen University, Shenzhen, Guangdong 518107, P.R. China.
The Journal of Physical Chemistry Letters
|May 20, 2024
Summary
Lead-chloride perovskites show deep defects affecting optoelectronics. Photoluminescence studies reveal these defects and offer strategies for tuning properties in methylammonium lead chloride (MAPbCl3) for better devices.
Area of Science:
- Materials Science
- Solid-State Physics
- Optoelectronics
Background:
- Lead-chloride perovskites are promising for optoelectronic applications like UV photodetection.
- Understanding deep defect impacts on carrier recombination dynamics in wide-bandgap materials is crucial.
Purpose of the Study:
- Investigate defect properties in methylammonium lead chloride (MAPbCl3).
- Elucidate the role of intrinsic defects in carrier recombination.
- Develop strategies for defect passivation and engineering in lead-chloride perovskites.
Main Methods:
- Photoluminescence (PL) spectroscopy was employed to study defect properties.
- Systematic variation of precursor type and ratio during synthesis.
Main Results:
- Four sub-bandgap emissions were observed in addition to intrinsic emission.
- These emissions are attributed to excitons bound to intrinsic vacancy and interstitial defects.
- Emission feature intensities were tunable by adjusting precursor composition.
Conclusions:
- The study provides critical insights into defect properties and carrier recombination mechanisms in MAPbCl3.
- Demonstrated efficient strategies for defect passivation and engineering.
- Paves the way for advancing lead-chloride perovskite-based optoelectronic devices.
