Jayawardena, K.D.G.I., Thirimanne, H.M., Tedde, S.F. et al. (5 more authors) (2019) Millimeter-scale unipolar transport in high sensitivity organic-inorganic semiconductor X-Ray detectors. ACS Nano, 13 (6). pp. 6973-6981. ISSN 1936-0851
Abstract
Hybrid inorganic-in-organic semiconductors are an attractive class of materials for optoelectronic applications. Traditionally, the thicknesses of organic semiconductors are kept below 1 micron due to poor charge transport in such systems. However, recent work suggests that charge carriers in such organic semiconductors can be transported over centimeter length scales opposing this view. In this work, a unipolar X-ray photoconductor based on a bulk heterojunction architecture, consisting of poly(3-hexylthiophene), a C70 derivative and high atomic number bismuth oxide nanoparticles operating in the 0.1 – 1 mm thickness regime is demonstrated, having a high sensitivity of ~160 µCmGy-1cm-3. The high performance enabled by hole drift lengths approaching a millimeter facilitates a device architecture allowing a high fraction of the incident X-rays to be attenuated. An X-ray imager is demonstrated with sufficient resolution for security applications such as portable baggage screening at border crossings and public events and scalable medical applications.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 American Chemical Society. This is an author-produced version of a paper subsequently published in ACS Nano. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | detectors; direct conversion; radiation; inorganics; organics |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 31 May 2019 11:07 |
Last Modified: | 03 Dec 2021 12:17 |
Status: | Published |
Publisher: | American Chemical Society |
Refereed: | Yes |
Identification Number: | 10.1021/acsnano.9b01916 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:146724 |