# Evaluating the Resistance of Bifacial Perovskite Photodetectors to Xenon Ion Irradiation

## TL;DR

Bifacial perovskite photodetectors show strong resistance to high-energy xenon ion radiation, making them suitable for use in extreme radiation environments.

## Contribution

Demonstrates the radiation tolerance of bifacial perovskite photodetectors under high fluence xenon ion irradiation.

## Key findings

- At low fluence, photodetector performance slightly decreased but detectivity increased due to higher shunt resistance.
- At high fluence, devices retained over 60% of their initial performance and maintained low spectral noise density.
- Bifacial perovskite photodetectors show potential for reliable operation in harsh radiation environments.

## Abstract

In this work, high‐performance bifacial perovskite photodetectors (BPPDs) are systematically investigated before and after xenon ion irradiation with energy 1.75 MeV nucleon−1 (231 MeV) and fluences up to 1011 nucleons cm−2, simulating extreme radiation environments. A comprehensive characterization of the materials used in the device's functional layers is conducted, accompanied by an in‐depth analysis of device performance before and after irradiation. Before irradiation, the devices exhibited good performance, with responsivity (R) of 0.39 A W−1 (front side) and 0.33 A W−1 (back side), detectivity (D*) of 2.4 × 1011 and 2.0 × 1011 Jones. At low fluence (1010 nucleons cm−2): R slightly decreased to 0.37/0.31 A W−1, while D* increased to 4.4 × 1011/3.7 × 1011 Jones due to an increase in shunt resistance. At higher fluence (1011 nucleons cm−2), irradiation induced high defect formation within the functional layers, causing pronounced degradation: R dropped to 0.25/0.18 A W−1, D* dropped to 2.8 × 1011/2.2 × 1011 Jones. Despite these changes, the devices retained over 60% of their initial performance and maintained low spectral noise density, confirming notable radiation tolerance. The synergy of bifaciality and radiation resistance highlights the potential of BPPDs for reliable operation under harsh radiation conditions, offering a promising solution for future optoelectronic applications in radiation‐exposed environments.

Bifacial perovskite photodetectors maintain high efficiency and stability after 231 MeV xenon ion irradiation. Key photodetector parameters remain nearly unchanged at low fluence (1010 nucleons cm−2) and show only moderate degradation at high fluence (1011 nucleons cm−2), highlighting their strong radiation tolerance and suitability for optoelectronic applications in extreme radiation environments.