Abstract
Much progress has been made concerning the general features of carrier transport and thermalization mechanisms in amorphous semiconductors from time-resolved studies of photocurrents, photoluminescence and photoinduced absorption. A common feature of all of these measurements is the observation of anomolous dispersion in the carrier dynamics characterized by a power-law time decay which is generally thought to derive from an exponential distribution (energy) of band-tail states in which thermalization procedes by multiple trapping (MT). However, an exponential energy distribution of hopping sites will also give rise to a power-law decay. Therefore, a determination of the transport and thermalization mechanisms operative in amorphous semiconductors is a difficult problem compounded by uncertainty regarding the actual energy distribution of band-tail states near the band edges and whether or not any structure exists. The purpose of this paper is to present new transient photocurrent measurements in a-Se and a-Si:H with improved experimental time resolution which allows one to examine carrier thermalization and the nature of the distribution of states close to the band edges.
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References
H. Scher and E.W. Montroll, Phys. Rev. B 12(1975) 2455.
T.E. Orlowski and H. Scher, Phys. Rev. Lett. 54(1985) 220.
D. Monroe, Phys. Rev. Lett. 54(1985) 146.
J.M. Marshall and R.A. Street, Solid State Commun. 50(1984) 91.
M. Silver, E. Snow and D. Adler, Solid State Commun. 53 (1985) 637.
S.O. Kasap and C. Juhasz, J. Phys. D 18 (1985) 703; and references therein.
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© 1988 Plenum Press, New York
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Orlowski, T.E., Abkowitz, M. (1988). Microstripline Transient Photocurrents: A Probe of Carrier Thermalization and Band-Tail State Densities in Amorphous Semiconductors. In: Scher, H. (eds) Unconventional Photoactive Solids. Institute for Amorphous Studies Series. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0727-3_22
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DOI: https://doi.org/10.1007/978-1-4613-0727-3_22
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4612-8052-1
Online ISBN: 978-1-4613-0727-3
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