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An Investigation of the Surface Properties of (Ag,Cu)(In,Ga)Se _{\bf 2} Thin Films

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6 Author(s)
Simchi, H. ; Dept. of Mater. Sci. & Eng., Univ. of Delaware, Newark, DE, USA ; McCandless, B.E. ; Kim, K. ; Boyle, J.H.
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(Ag,Cu)(In,Ga)Se2 alloy absorber layers with various Ga/(Ga+In) and Ag/(Ag+Cu) ratios were deposited using multisource elemental evaporation and analyzed by glancing incidence X-ray diffraction and energy dispersive X-ray spectroscopy. All films exhibit chalcopyrite reflections in the X-ray diffraction pattern and films with 0.5 ≤ Ga/(Ga+In) <; 1 and Ag/(Ag+Cu) >; 0.5 have additional reflections consistent with an ordered defect phase which is limited to the near-surface region of the film. X-ray photoelectron spectroscopy measurements show that all films studied have low (Ag+Cu)/Se and (Ag+Cu)/(Ga+In) ratios near the surface relative to the bulk composition, consistent with an ordered defect compound identified as (Ag,Cu)(In,Ga)5Se8. Additionally, the near-surface region of (Ag,Cu)(In,Ga)Se2 films contains a higher Ag/(Ag+Cu) ratio than the bulk and the Ag(In,Ga)Se2 film contains excess Ag near the surface.

Published in:

Photovoltaics, IEEE Journal of  (Volume:2 ,  Issue: 4 )

Date of Publication:

Oct. 2012

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