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Photoconductivity of CdS-CdSe granular films: experiment and theory | | A. S. Meshkov
; W. V. Pogosov
; I. A. Ryzhikov
; Yu. V. Trofimov
; | | Date: |
14 Oct 2008 | | Abstract: | We study experimentally the photoconductivity of CdS-CdSe granular films and
reveal the connection between the film’s microstructure and photoconductivity.
The optimal time for heat-treatment of samples is found, for which the highest
photoconductivity is achived. Films of this type are characterized by compact
packing of grains with large-area and narrow spacings between their edges. We
suggest that the charge transfer occurs mostly through intergrain spacings,
where electrons are trapped being released from grains by light quanta. These
electrons first occupy energy levels in pores with low overlap of wave
functions in different pores. As a result, the conductivity in this limit is
low. Increasing the number of electrons leads to the occupation of higher
energy levels, which correspond to states localized in narrow plane-like spaces
between neighboring grains with good overlap of wave functions from different
spacings. The conductivity in such a regime is high. A simple theoretical model
is proposed. | | Source: | arXiv, 0810.2458 | | Services: | Forum | Review | PDF | Favorites | |
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