High‐Sensitivity Flexible X‐Ray Detectors based on Printed Perovskite Inks. (12th January 2021)

• Record Type: Journal Article
• Authors: Ciavatti, Andrea; Sorrentino, Roberto; Basiricò, Laura; Passarella, Bianca; Caironi, Mario; Petrozza, Annamaria; Fraboni, Beatrice
• Is Part Of: Advanced functional materials. Volume 31:Number 11(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-01-12
• Subjects: metal halide perovskites -- polycrystalline film -- printing -- X‐ray detectors; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202009072
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: The demand for high‐energy radiation detection systems combining high sensitivity, low‐cost and large‐area fabrication has pushed the research on hybrid perovskites as promising materials for X‐ and γ‐photon detection, thanks to their high Z atoms, solution‐processability, and high optoelectronic performance. Here, flexible direct X‐ray detectors are demonstrated with outstanding real‐time detection properties. They are based on printed micrometers‐thick films of methylammonium lead triiodide nanocrystals inks, formulated in low boiling point and benign solvents. Record optoelectronic performances, such as high X‐ray sensitivity (up to 2270 µC Gy −1 cm −2 ), radiation tolerance over 2.2 Gy of total dose, and fast response time (48 ms) have been achieved by using a simple device architecture and materials processing The functionality under strong bending stress (strain > 10%) and under high X‐ray energy (up to 150 keV) has been assessed, opening the way for flexible real‐time direct radiation detectors and imagers, operating at low‐voltages (bias < 4V) and apt to be fabricated by means of large‐area scalable processes. Abstract : Novel direct X‐ray detectors based on hybrid organic‐inorganic perovskite nanocrystals printed on flexible substrates are presented. The passivation of electrically active defects by an organic layer leads to high sensitivity, radiation tolerance, and fast response time. Operation under strong bending has been assessed, opening the way for flexible real‐time detection at low bias voltage.