Optical and photoelectric properties of nanocrystalline SnO2 - CdSe quantum dot structuresстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Аннотация:Microstructure, optical and photoelectric properties of
nanocrystalline porous SnO2 films on an insulating substrate
with colloidal CdSe quantum dots as a sensitizer
have been studied. SnO2 films consist of nanocrystallites
with the average size of ~ 20 nm combined into agglomerates
as large as ~ 1 μm. CdSe quantum dots with themean
size of ~ 3.5 nm were incorporated into porous
SnO2 films by dipping the substrates into a colloidal solution
of CdSe quantum dots. Transport and photoelectric
properties of the structures were studied in the temperature
interval 77 – 300 K. Optical properties were investigated
in the visible spectral range. Persistent photoconductivity
at the room temperature has been observed.
Possible mechanisms of the persistent photoconductivity
for this composite system are discussed