Halide Perovskites for Direct Conversion Megavoltage X‐Ray Detectors. (17th October 2022)

• Record Type: Journal Article
• Authors: Kundu, Soumya; O'Connell, Jericho; Hart, Alexander; Richtsmeier, Devon; Bazalova‐Carter, Magdalena; Saidaminov, Makhsud I.
• Is Part Of: Advanced Electronic Materials. Volume 8:Number 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-17
• Subjects: crystallization -- inch long single crystals -- lead halide perovskites -- megavoltage X‐ray detectors; Materials -- Electric properties -- Periodicals; Materials science -- Periodicals; Magnetic materials -- Periodicals; Electronic apparatus and appliances -- Periodicals; 537
• DOI: 10.1002/aelm.202200640
• Languages: English
• ISSNs: 2199-160X

Abstract

Abstract: Megavoltage (MV) X‐ray detectors used in cancer treatment either suffer from low sensitivity (scintillators) or prohibitively high cost (direct conversion). Here solution‐processed direct‐conversion MV X‐ray detectors are demonstrated based on halide perovskites. The authors' prototype devices show a sensitivity of ≈0.7 µC Gyair −1 cm –2, high photon‐to‐carrier conversion efficiency of 42 500%, and a signal‐to‐noise ratio of ≈1750 to 6 MV X‐ray beam of a medical linear accelerator. The detector shows a contrast of over −1.5% per cm of solid water, comparable to state‐of‐art commercial gadolinium oxysulfide (GOS) MV X‐ray scintillators. This work demonstrates the first prototype of low‐cost and efficient direct‐conversion MV X‐ray detectors. Abstract : Megavoltage (MV) X‐ray detectors are crucial for radiation therapy and security purposes. State‐of‐art MV X‐ray detectors are based on gadolinium oxysulfide (GOS), which operate in indirect‐conversion or scintillation mode. Here a prototype of direct‐conversion MV X‐ray detectors based on solution‐processed lead halide perovskite single crystals is demonstrated.