Solution-Processed Perovskite/Metal-Oxide Hybrid X-Ray Detector and Array with Decoupled Electronic and Ionic...

Area of Science:

• Materials Science
• Solid-State Physics
• Detector Technology

Background:

• Lead halide perovskites are promising for X-ray detection due to heavy elements and high mobility-lifetime (µτ) products.
• Conventional perovskite photoconduction detectors (PCDs) suffer from ion-migration issues due to shared conduction paths for electronic signals and mobile ions.

Purpose of the Study:

• To design a hybrid X-ray detector that mitigates ion-migration issues in perovskite-based devices.
• To improve the stability, response time, and signal output of perovskite X-ray detectors.

Main Methods:

• A hybrid device structure was designed, vertically stacking perovskite onto an indium oxide (In₂O₃) transistor with lateral transport.
• Perovskite acts as an X-ray sensitizer, activating the In₂O₃ conduction channel where the electrical signal is processed.
• Ionic and electronic transport pathways were decoupled within the device architecture.

Main Results:

• The hybrid detectors demonstrated insensitivity to perovskite ionic motion, eliminating hysteresis and baseline drift.
• Significant improvements were observed, including reduced dark current, faster response times, and a fourfold increase in photocurrent.
• Successful array integration and preliminary X-ray imaging were achieved.

Conclusions:

• The hybrid device strategy effectively addresses ion-migration challenges in perovskite X-ray detectors.
• This approach offers a pathway to high-performance perovskite-based X-ray detectors and imaging arrays beyond material modifications.