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. 2023 Oct 12;14(40):9136-9144.
doi: 10.1021/acs.jpclett.3c02061. Epub 2023 Oct 5.

Surface Engineering of Methylammonium Lead Bromide Perovskite Crystals for Enhanced X-ray Detection

Abraha Tadese Gidey  1 , Yuki Haruta  2 , Artur P Herman  3 , Miłosz Grodzicki  1   3 , Anna M Melnychenko  1   3 , Dominika Majchrzak  1 , Somnath Mahato  1 , Ernest Rogowicz  4 , Marcin Syperek  4 , Robert Kudrawiec  1   3 , Makhsud I Saidaminov  2   5   6 , Ahmed L Abdelhady  1   7   8
Affiliations

Surface Engineering of Methylammonium Lead Bromide Perovskite Crystals for Enhanced X-ray Detection

Abraha Tadese Gidey et al. J Phys Chem Lett. .

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.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
(a–b) Photographs of the Control-1M MAPbBr3 crystals under normal light and under UV light, respectively. (c–d) Corresponding photographs of DCM-0.2M, respectively. (e–f) Optical microscopy images of top and bottom faces of the Control-1M MAPbBr3 crystals, respectively. (g–h) Corresponding optical microscopy images of DCM-0.2M crystals top and bottom faces, respectively. (i–j) SEM images of top and bottom faces of the Control-1M MAPbBr3 crystals, respectively. (k–l) Corresponding SEM images of DCM-0.2M crystals top and bottom faces, respectively.
Figure 2
Figure 2
Streak camera images of the time-resolved photoluminescence (TRPL) of Control-1M (a) and DCM-0.2M (b) recorded at room temperature together with reflectance (R) (cyan color curves) and PL spectra integrated over time (green lines) and their decomposition for two Gaussian peaks (white lines). (c) PL spectra for different time delays (Δt) after excitation. (d) Decay of PL at selected wavelengths. (e) Time-integrated PL spectra and decay times (τ1 and τ2) extracted from the PL decay curves.
Figure 3
Figure 3
(a) Schematic of the device structure and its band diagram. (b) Dark current densities of the devices. (c) Response current densities of the devices to the various dose rates of X-rays at a bias of −5 V. (d) Net response current densities of the devices to 25.2 μGyair s–1. (e) Relationship between the dose rates and the response current densities. (f) Sensitivities and (g) signal-to-noise ratios of the devices.
See this image and copyright information in PMC

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