Journal
ADVANCED ELECTRONIC MATERIALS
Volume 8, Issue 10, Pages -Publisher
WILEY
DOI: 10.1002/aelm.202200293
Keywords
high performance; organic field-effect transistors; organic semiconductor blends; X-ray detectors; X-ray images
Funding
- Spanish Government [PID2019-111682RB-I00, RTI2018-095460-B-I00]
- Severo Ochoa Programme for Centers of Excellence in RD [FUNFUTURE CEX2019-000917-S]
- Maria de Maeztu program for Spanish Structures of Excellence [MDM-2017-0767]
- Generalitat de Catalunya [2017-SGR-918, 2017-SGR13]
- FPU fellowship
- Ministerio de Ciencia e Innovacion [FJC2019-042161-I]
- INFN through the CSN5 FIRE project
- MINECO [CTQ2017-87773-P/AEI/FEDER]
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The implementation of organic semiconductors in X-ray detectors shows high performance and sensitivity, providing potential for the development of sensitive and low-cost X-ray imaging systems.
The implementation of organic semiconductor (OSC) materials in X-ray detectors provides exciting new opportunities for developing a new generation of biocompatible devices with high potential for the fabrication of sensitive and low-cost X-ray imaging systems. Here, the fabrication of high performance organic field-effect transistors (OFETs) based on blends of 1,4,8,11-tetramethyl-6,13-triethylsilylethynyl pentacene (TMTES) with polystyrene is reported. The films are printed employing a low cost and high-throughput deposition technique. The devices exhibit excellent electrical characteristics with a high mobility and low density of hole traps, which is ascribed to the favorable herringbone packing (different from most pentacene derivatives) and the vertical phase separation in the blend films. As a consequence, an exceptional high sensitivity of (4.10 +/- 0.05) x 10(10) mu C( )Gy(-1)cm(-3) for X-ray detection is achieved, which is the highest reported so far for a direct X-ray detector based on a tissue equivalent full organic active layer, and is higher than most perovskite film-based X-ray detectors. As a proof of concept to demonstrate the high potential of these devices, an X-ray image with sub-millimeter pixel size is recorded employing a 4-pixel array. This work highlights the potential exploitation of high performance OFETs for future innovative large-area and highly sensitive X-ray detectors for medical dosimetry and diagnostic applications.
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