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 (MAPbBr3) film on top of bulk mm-sized single crystals. Such MAPbBr3 crystals with a MAPbBr3 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 MAPbBr3 crystals that show no emission under UV light. Time-resolved photoluminescence and electrical measurements indicate that the MAPbBr3 film/MAPbBr3 crystals possess less surface defects compared to the bare MAPbBr3 crystals. Therefore, X-ray detectors fabricated using the surface-engineered MAPbBr3 crystals provide an almost 5 times improved sensitivity to X-rays and a more stable baseline drift with respect to the typical MAPbBr3 crystals. © 2023 The Authors. Published by American Chemical Society.
Original language | British English |
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Pages (from-to) | 9136-9144 |
Number of pages | 9 |
Journal | J. Phys. Chem. Lett. |
Volume | 14 |
Issue number | 40 |
DOIs | |
State | Published - 2023 |
Keywords
- Chemical detection
- Lead compounds
- Passivation
- Perovskite
- Single crystals
- Surface defects
- X ray detectors
- American Chemical Society
- Device performance
- Halide perovskites
- Optoelectronics devices
- Optoelectronics property
- Perovskite crystal
- Polycrystalline
- Surface engineering
- UV-light
- X-ray detections
- X ray photoelectron spectroscopy