Synthesis of nanocrystalline CdS thin films in PVA matrix

被引：60

作者：

Devi, R. ^{[1
]}

Purkayastha, P.

Kalita, P. K.

Sarma, B. K.

机构：

[1] Gauhati Univ, Dept Phys, Gauhati 781014, India

[2] Guwahati Coll, Dept Phys, Gauhati 781021, India

来源：

BULLETIN OF MATERIALS SCIENCE | 2007年 / 30卷 / 02期

关键词：

chemical method; UV spectra; spectral response; energy band gap;

D O I：

10.1007/s12034-007-0022-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanocrystalline thin films of CdS are deposited on glass substrates by chemical bath deposition technique using polyvinyl alcohol (PVA) matrix solution. Crystallite sizes of the nanocrystalline films are determined from broadening of X-ray diffraction lines and are found to vary from 5 center dot 4-10 center dot 2 nm. The band gap of the nanocrystalline material is determined from the UV spectrograph. The absorption edge is shifted towards the lower wave length side (i.e. blue shift) and are found to be within the range from 2 center dot 48-2 center dot 8 eV as grain sizes decrease from 10 center dot 2-5 center dot 4 run. This is also supported by the spectral response curves. An increase of molarity decreases the grain size which in turn increases the band gap.

引用

页码：123 / 128

页数：6

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