The Effect of Ga+ ion beam irradiation on the optical properties of MAPbBr3 single crystals

TL;DR

This study investigates how 30 keV Ga+ ion beam irradiation affects the optical properties of MAPbBr3 single crystals, revealing dose-dependent suppression of excitonic luminescence and potential for spatial property modulation.

Contribution

First experimental analysis of Ga+ ion beam effects on MAPbBr3's optical properties, demonstrating controlled luminescence suppression and high spatial resolution for device fabrication.

Findings

Irradiation suppresses excitonic luminescence starting at 10^14/cm2

Integral luminescence remains stable up to higher doses

Spatial modification resolution is approximately 50 μm

Abstract

The effect of 30 keV Ga^+ ion beam irradiation on the low-temperature photoluminescence from a single crystal of the hybrid organic-inorganic perovskite MAPbBr3 is presented for the first time. The irradiation leads to the suppression of the crystal's excitonic luminescence starting from the dose of 10^14/cm2. However, its integral luminescence does not drop up to the doses of two orders of magnitude higher. Further increase of the irradiation dose starts to affect the integral luminescence and causes the crystal to sputter. The spatial resolution of modification by the ion beam found in the experiment is no worse than 50 {\mu}m. The theoretical resolution limit estimated by Monte-Carlo modeling using SRIM is three orders of magnitude lower. This work paves the way for the design of devices based on the spatial modulation of perovskite's excitonic properties or direct focused ion beam writing.