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Structural and optical properties of chemically deposited Cd(S-Se): CdCl$_{2}$, Sm films

Content Provider	Springer Nature Link
Author	Singh, R. S. Bhushan, S.
Copyright Year	2009
Abstract	Results of SEM and XRD studies, optical absorption and photoluminescence (PL) emission spectra and photoconductivity (PC), rise and decay studies are reported for Cd(S-Se): CdCl$_{2}$, Sm films prepared by chemical deposition method on glass substrates at 60°C in a water bath. SEM studies show ball-type structures along with voids which are related to layered growth. XRD studies show prominent diffraction lines of CdS and CdSe along with some peaks of CdCl$_{2}$ and impurity Sm. The values of strain (ɛ), grain size (D) and dislocation density (δ) are evaluated from XRD studies and the nature of crystallinity of the films are discussed. Optical absorption spectra also show the presence of Sm in the lattice. From the results of optical absorption spectra, the band gaps are determined. PL emission spectra of Cd(S-Se) consist of two peaks which are related to the edge emission of CdS and CdSe involving excitons. In Sm-doped emissions corresponding to transitions $^{4}$ G $_{5/2}$ to $^{6}$ H $_{5/2}$, $^{6}$ H $_{7/2}$ and $^{6}$ H $_{9/2}$ are observed. Sufficiently high photo current (I $_{pc}$) to dark current (I $_{dc}$) ratios with a maximum value of the order of 10$^{6}$ are also obtained in some special cases. This high photosensitization is related to increase in mobility and life time of carriers due to photo excitation.
Starting Page	125
Ending Page	133
Page Count	9
File Format	PDF
ISSN	02504707
Journal	Bulletin of Materials Science
Volume Number	32
Issue Number	2
e-ISSN	09737669
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-07-18
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Photoconduction chemical bath deposition photoluminescence energy bandgap Engineering Materials Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science

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