UV-VIS Photoconductivity of Nanocrystalline Tin Oxideстатья

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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.

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[1] Uv-vis photoconductivity of nanocrystalline tin oxide / E. N. Varechkina, M. N. Rumyantseva, R. B. Vasiliev et al. // Journal of Nanoelectronics and Optoelectronics. — 2012. — Vol. 7, no. 6. — P. 623–628. Conductivity of nanocrystalline SnO2 was studied under UV (λmax = 380 nm) and green light (λmax=535 nm) illumination. The influence of SnO2 annealing temperature on photoconductivity behavior under UV and green light demonstrates opposite trends. The maximum response to UV radiation is observed for SnO2 annealed at 300 ºC and it decreases with increasing annealing temperature of the samples. Under green light illumination the maximum conductivity growth was found for SnO2, annealed at 700 ºC. The dominant mechanism for the conductivity increase under UV illumination is the photodesorption of oxygen. The lowering of photoresponse correlates with the decrease of specific surface area of the samples and low temperature hydrogen consumption in TPR-H2 experments. The photoconductivity of tin oxide under green light illumination can be explained by the presence of deep acceptor levels in SnO2 band gap related to surface oxygen vacancies. According to electron paramagnetic resonance investigation the high temperature annealing results in the generation of oxygen vacancies, which may be responsible for high photoresponse of SnO2 annealed at 500 and 700 ºC under green light illumination. [ DOI ]

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