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Charged-particle spectroscopy in organic semiconducting single crystals

Ciavatti, A, Sellin, PJ, Basirico, L, Fraleoni-Morgera, A and Fraboni, B (2016) Charged-particle spectroscopy in organic semiconducting single crystals APPLIED PHYSICS LETTERS, 108 (15), ARTN 15330.

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The use of organic materials as radiation detectors has grown, due to the easy processability in liquid phase at room temperature and the possibility to cover large areas by means of low cost deposition techniques. Direct charged-particle detectors based on solution-grown Organic Semiconducting Single Crystals (OSSCs) are shown to be capable to detect charged particles in pulse mode, with very good peak discrimination. The direct charged-particle detection in OSSCs has been assessed both in the planar and in the vertical axes, and a digital pulse processing algorithm has been used to perform pulse height spectroscopy and to study the charge collection efficiency as a function of the applied bias voltage. Taking advantage of the charge spectroscopy and the good peak discrimination of pulse height spectra, an Hecht-like behavior of OSSCs radiation detectors is demonstrated. It has been possible to estimate the mobility-lifetime value in organic materials, a fundamental parameter for the characterization of radiation detectors, whose results are equal to lscoplanar¼ (5 .5 6 0.6 ) 106 cm2 /V and lssandwich¼ (1 .9 6 0.2 ) 106 cm2 /V, values comparable to those of polycrystalline inorganic detectors. Moreover, alpha particles Time-of-Flight experiments have been carried out to estimate the drift mobility value. The results reported here indicate how charged-particle detectors based on OSSCs possess a great potential as low-cost, large area, solid-state direct detectors operating at room temperature. More interestingly, the good detection efficiency and peak discrimination observed for chargedparticle detection in organic materials (hydrogen-rich molecules) are encouraging for their further exploitation in the detection of thermal and high-energy neutrons. VC 2016 AIP Publishing LLC.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Ciavatti, A
Sellin, PJ
Basirico, L
Fraleoni-Morgera, A
Fraboni, B
Date : 11 April 2016
DOI : 10.1063/1.4945597
Copyright Disclaimer : Copyright 2016 American Institute of Physics
Uncontrolled Keywords : Science & Technology, Physical Sciences, Physics, Applied, Physics, IONIZING-RADIATION, DETECTORS
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 02 Mar 2017 14:14
Last Modified : 11 Apr 2017 02:08

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