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Optical investigations on sputtered CuCl thin films

Published online by Cambridge University Press:  01 February 2011

Gomathi Natarajan,
Anirban Mitra,
Lisa O'Reilly,
Stephen Daniels,
David C. Cameron,
Patrick J. McNally,
Olabanji F. Lucas and
Louise Bradley
Gomathi Natarajan
Affiliation:
gomathi.natarajan2@mail.dcu.ie, Dublin City University, Electronic Engineering, Glasnevin, Dublin, N/A, D9, Ireland, 0035317007668, 0035317005508
Anirban Mitra
Affiliation:
anmitra@yahoo.com, Trinity College Dublin, Optoelectronics Laboratory, Ireland
Lisa O'Reilly
Affiliation:
oreillyl@eeng.dcu.ie, Dublin City University, Nanomaterials Processing Laboratory (NPL), RINCE, School of Electronic Engineering, Ireland
Stephen Daniels
Affiliation:
daniels@eeng.dcu.ie, Nanomaterials Processing Laboratory (NPL), NCPST, School of Electronic Engineering, Ireland
David C. Cameron
Affiliation:
david.cameron@lut.fi, Lappeenranta University of Technology, 3Advanced Surface Technology Research Laboratory (ASTRaL), Mikkeli Research Centre, Finland
Patrick J. McNally
Affiliation:
patrick.mcnally@rince.ie, Ireland
Olabanji F. Lucas
Affiliation:
olalucas@eeng.dcu.ie, Dublin City University, Nanomaterials Processing Laboratory (NPL), RINCE, School of Electronic Engineering, Ireland
Louise Bradley
Affiliation:
bradlel@tcd.ie, Trinity College Dublin, Optoelectronics Laboratory, Ireland
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Abstract

Copper (I) chloride (CuCl) is a potential candidate for ultra violet optoelectronics due to the fact that it is closely lattice matched with silicon, which makes it readily integrable with silicon device technology. The structural and optoelectronic properties of CuCl thin films deposited by RF magnetron sputtering are investigated. The crystallinity is studied using X-ray diffraction which confirms the growth of CuCl thin films with cubic zinc blende structure predominantly orientated in <111> direction. Excitonic transitions in the thin films were thoroughly investigated using optical absorbance and luminescence spectroscopies. Room temperature absorption spectroscopic analysis confirms the existence of two exciton peaks namely Z12 and Z3 at 372 and 380 nm respectively. A strong UV emission is observed at room temperature in cathodoluminescence and photoluminescence spectra due to the recombination of Z3 exciton at approximately 384 nm. In the low temperature photoluminescence spectrum, a free exciton (Z3) and a bound exciton (I1) are observed. A variation of 1.3 nm to 10 nm was observed in the Z3 exciton line width from 10 K to 300 K.

Keywords

optoelectronicsputteringphotoemission

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References

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