Halide Perovskites for Direct Conversion Megavoltage X‐Ray Detectors
Soumya Kundu, J. William O’Connell, Alexander Hart, Devon Richtsmeier, Magdalena Bazalova‐Carter, Makhsud I. Saidaminov
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 Gy air −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.