期刊
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
卷 64, 期 2, 页码 781-788出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TNS.2017.2652139
关键词
Alpha particle detector; organic crystals; radiation detector; rubrene; semiconductor; solution growth
资金
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- U.S. Defense Threat Reduction Agency (DTRA) [DTRA10027-14474]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1401242] Funding Source: National Science Foundation
There has been increased interest in organic semiconductors over the last decade because of their unique properties. Of these, 5, 6, 11, 12-tetraphenylnaphthacene (rubrene) has generated the most interest because of its high charge carrier mobility. In this work, large single crystals with a volume of similar to 1 cm(3) were grown from solution by a temperature reduction technique. The faceted crystals had flat surfaces and cm-scale, visually defect-free areas suitable for physical characterization. X-ray diffraction analysis indicates that solvent does not incorporate into the crystals and photoluminescence spectra are consistent with pristine, high-crystallinity rubrene. Furthermore, the response curve to pulsed optical illumination indicates that the solution grown crystals are of similar quality to those grown by physical vapor transport, albeit larger. The good quality of these crystals in combination with the improvement of electrical contacts by application of conductive polymer on the graphite electrodes have led to the clear observation of alpha particles with these rubrene detectors. Preliminary results with a Cf-252 source generate a small signal with the rubrene detector and may demonstrate that rubrene can also be used for detecting high-energy neutrons.
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