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Molecular Weight Tuning of Organic Semiconductors for Curved Organic–Inorganic Hybrid X‐Ray Detectors.

Authors :
Nanayakkara, M. Prabodhi A.
Masteghin, Mateus G.
Basiricò, Laura
Fratelli, Ilaria
Ciavatti, Andrea
Kilbride, Rachel C.
Jenatsch, Sandra
Webb, Thomas
Richheimer, Filipe
Wood, Sebastian
Castro, Fernando A.
Parnell, Andrew J.
Fraboni, Beatrice
Jayawardena, K. D. G. Imalka
Silva, S. Ravi P.
Source :
Advanced Science; 1/14/2022, Vol. 9 Issue 2, p1-15, 15p
Publication Year :
2022

Abstract

Curved X‐ray detectors have the potential to revolutionize diverse sectors due to benefits such as reduced image distortion and vignetting compared to their planar counterparts. While the use of inorganic semiconductors for curved detectors are restricted by their brittle nature, organic–inorganic hybrid semiconductors which incorporated bismuth oxide nanoparticles in an organic bulk heterojunction consisting of poly(3‐hexylthiophene‐2,5‐diyl) (P3HT) and [6,6]‐phenyl C71 butyric acid methyl ester (PC70BM) are considered to be more promising in this regard. However, the influence of the P3HT molecular weight on the mechanical stability of curved, thick X‐ray detectors remains less well understood. Herein, high P3HT molecular weights (>40 kDa) are identified to allow increased intermolecular bonding and chain entanglements, resulting in X‐ray detectors that can be curved to a radius as low as 1.3 mm with low deviation in X‐ray response under 100 repeated bending cycles while maintaining an industry‐standard dark current of <1 pA mm−2 and a sensitivity of ≈ 0.17 μC Gy−1 cm−2. This study identifies a crucial missing link in the development of curved detectors, namely the importance of the molecular weight of the polymer semiconductors used. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
21983844
Volume :
9
Issue :
2
Database :
Complementary Index
Journal :
Advanced Science
Publication Type :
Academic Journal
Accession number :
154689362
Full Text :
https://doi.org/10.1002/advs.202101746