Journal
ACS NANO
Volume 13, Issue 6, Pages 6973-6981Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b01916
Keywords
detectors; direct conversion; radiation; inorganics; organics
Categories
Funding
- Leverhulme Trust [RPG-2014-312]
- EPSRC [EP/R025304/1]
- University of Surrey Overseas Research Scholarship/University Research Scholarship
- Xenocs
- EPSRC [EP/R025304/1] Funding Source: UKRI
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Hybrid inorganic-in-organic semiconductors are an attractive class of materials for optoelectronic applications. Traditionally, the thicknesses of organic semiconductors are kept below 1 mu m 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 similar to 160 mu C mGy(-1) cm(-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.
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