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Electronic Processes in α-Sulfur

Thornber, K. K. and Mead, C. A. (1965) Electronic Processes in α-Sulfur. Journal of Physics and Chemistry of Solids, 26 (9). pp. 1489-1495. ISSN 0022-3697. doi:10.1016/0022-3697(65)90047-8.

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The mobilities of photo-generated electrons and holes in orthorhombic sulfur are determined by drift mobility techniques. At room temperature electron mobilities between 0.4 cm^2/V-sec and 4.8 xm^2/V-sec and hole mobilities of about 5.0 cm^2/V-sec are reported. The temperature dependence of the electron mobility is attributed to a level of traps whose effective depth is about 0.12 eV. This value is further supported by both the voltage dependence of the space-charge-limited, d.c. photocurrents and the photocurrent versus photon energy measurements. As the field is increased from 10kV/cm to 30kV/cm a second mechanism for electron transport becomes appreciable and eventually dominates. Evidence that this is due to impurity band conduction at an appreciably lower mobility (4.10^(-4) cm^2/V-sec) is presented. No low mobility hole current could be detected for fields below 35 KV/cm. When fields exceeding 30 kV/cm for electron transport and 35 kV/cm for hole transport are applied, avalanche phenomena are observed. The results obtained are consistent with recent energy gap studies in sulfur. The theory of the transport of photo-generated carriers is modified to include the case of appreciable thermo-regeneration from the traps in one transit time.

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Additional Information:Copyright © 1965 Pergamon Press. Received 2 March 1965. This work was supported in part by the Office of Naval Research under Contract N.R. Nonr-220(42) and the International Telephone and Telegraph Company.
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Office of Naval Research (ONR)Nonr-220(42)
International Telephone and Telegraph CompanyUNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20141217-135230195
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52971
Deposited On:17 Dec 2014 22:39
Last Modified:10 Nov 2021 19:46

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