AI Article Synopsis
- The quality of the surface on lead halide perovskite crystals significantly affects their optoelectronic properties and overall device functionality.
- Researchers introduced a new technique that involves growing a polycrystalline film on existing bulk single crystals, resulting in crystals that emit bright green light under UV exposure.
- The engineered crystals show fewer surface defects, leading to X-ray detectors that are nearly five times more sensitive and demonstrate greater stability compared to standard MAPbBr crystals.
Article Abstract
The surface quality of lead halide perovskite crystals can extremely influence their optoelectronic properties and device performance. Here, we report a surface engineering crystallization technique in which we in situ grow a polycrystalline methylammonium lead tribromide (MAPbBr) film on top of bulk mm-sized single crystals. Such MAPbBr crystals with a MAPbBr passivating film display intense green emission under UV light. X-ray photoelectron spectroscopy demonstrates that these crystals with emissive surfaces are compositionally different from typical MAPbBr crystals that show no emission under UV light. Time-resolved photoluminescence and electrical measurements indicate that the MAPbBr film/MAPbBr crystals possess less surface defects compared to the bare MAPbBr crystals. Therefore, X-ray detectors fabricated using the surface-engineered MAPbBr crystals provide an almost 5 times improved sensitivity to X-rays and a more stable baseline drift with respect to the typical MAPbBr crystals.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10577767 | PMC |
| http://dx.doi.org/10.1021/acs.jpclett.3c02061 | DOI Listing |
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