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Synthesis of Optimized CZTS Thin Films for Photovoltaic Absorber Layers by Sputtering from Sulfide Targets and Sulfurization

Published online by Cambridge University Press:  01 February 2011

Haritha Nukala
Affiliation:
haritha.nukala@utah.edu, University of Utah, Materials Science and Engineering, Salt Lake City, Utah, United States
Jeffrey L. Johnson
Affiliation:
jeff.l.johnson@utah.edu, University of Utah, Electrical and Computer Engineering, Salt Lake City, Utah, United States
Ashish Bhatia
Affiliation:
ashish.bhatia@utah.edu
Elizabeth A Lund
Affiliation:
liz.lund@utah.edu, University of Utah, Chemical Engineering, Salt Lake City, Utah, United States
W.M Hlaing Oo
Affiliation:
w.hlaing@utah.edu, University of Utah, Materials Science and Engineering, Salt Lake City, Utah, United States
Loren W Rieth
Affiliation:
loren.rieth@utah.edu, University of Utah, Electrical and Computer Engineering, Salt Lake City, Utah, United States
Matt Nowell
Affiliation:
matt.nowell@ametek.com, EDAX Inc, Draper, Utah, United States
Michael A Scarpulla
Affiliation:
scarpulla@ece.utah.edu, University of Utah, Materials Science and Engineering, Salt Lake City, Utah, United States
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Abstract

Cu2ZnSnS4 (CZTS) is a promising alternative for Cu(In,Ga)Se2 (CIGS) absorber layers in thin film solar cells and is comprised of commodity elements which will enable scale-up of chalcopyrite panel production unhindered by elemental supplies and costs. Various CZTS synthesis methods, especially sulfurization of stacked metal or metal sulfide layers, are being studied and have led to cell efficiencies up to 6.7% [1]. Here we report our studies of CZTS thin film synthesis via room temperature sputtering from a single CZTS target and co-sputtering from Cu2S, ZnS and SnS2 binary targets, both followed by sulfurization between 500 C - 600 C using either elemental sulfur vapor or in-situ generated H2S. Sputtering from sulfur-containing targets is designed to increase the sulfur content in the precursor films to promote stoichiometry. We report on the effects of processing including deposition on soda-lime and borosilicate glasses and deposition of Na-containing layers on film morphology (AFM/SEM), composition (EDS), phase (XRD), grain size (XRD/EBSD), grain boundary structure (EBSD), optical (spectroscopic ellipsometry) and electrical properties. Processing conditions producing desirable Zn-rich/Cu-poor films are identified [1]. The formation of MoSe2 at Mo/CIGS interface is believed to promote Ohmic contacts, but in CZTS we associate excessive formation of frangible MoS2 with film delamination from Mo/borosilicate glass substrates. Strategies for preventing delamination including adhesion layers are investigated and discussed. P-N junctions are formed with CdS/ZnO using chemical bath deposition and sputtering, and I-V characteristics are reported. Schottky junctions are formed and C-V measurements are used to determine the doping in the CZTS absorber layers.[1] H. Katagiri, et al., MRS Symp. Proc. 1165 1165-M04-01 (2009).

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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References

[1] Katagiri, H. et al. , Applied Physics Express, 1 041201 (2008).CrossRefGoogle Scholar
[2] The rise of thin film solar power, The Economist, Oct (2009).Google Scholar
[3] Chen, S. et al. , Applied Physics Letters 96 021902 (2010).CrossRefGoogle Scholar
[4] Johnson, J. L. et al. , Mater. Res. Soc. Symp. Proc. EE3. 3 (2010).Google Scholar
[5] Schorr, S. & Gonzalez-Aviles, G., Thin Solid Films 517 2461 (2009).CrossRefGoogle Scholar
[6] Springer, G., Canadian Mineralogist 11 535 (1972).Google Scholar
[7] Katagiri, H. et al. , Mater. Res. Soc. Symp. Proc. 1165-M04-01 (2009).CrossRefGoogle Scholar
[8] Fernandes, P.A. et al. , Semicond. Sci. Technol. 24 105013 (2009).CrossRefGoogle Scholar
[9] Siebentritt, S. and Rau, U., Eds., Wide-Gap Chalcopyrites, (Springer, 2006).CrossRefGoogle Scholar
[10] Bhattacharya, R.N. et al. , Japanese Journal of Applied Physics, Vol 43, No. 11B (2004)CrossRefGoogle Scholar

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Synthesis of Optimized CZTS Thin Films for Photovoltaic Absorber Layers by Sputtering from Sulfide Targets and Sulfurization
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Synthesis of Optimized CZTS Thin Films for Photovoltaic Absorber Layers by Sputtering from Sulfide Targets and Sulfurization
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