Electronic structure of the Zn(O,S)/Cu(In,Ga)Se2 thin-film solar cell interface

Authors

Michelle Mezher, University of Nevada, Las VegasFollow
R Garris, National Renewable Energy Laboratory
L M. Mansfield, National Renewable Energy LaboratoryFollow
K Horsley, University of Nevada, Las VegasFollow
L Weinhardt, University of Nevada, Las VegasFollow
D A. Duncan, University of Nevada, Las VegasFollow
Monika Blum, University of Nevada, Las VegasFollow
S G. Rosenberg, University of Nevada, Las VegasFollow
M Bär, University of Nevada, Las VegasFollow
K Ramanathan, National Renewable Energy LaboratoryFollow
Clemens Heske, University of Nevada, Las VegasFollow

Document Type

Article

Publication Date

1-1-2016

Publication Title

Progress in Photovoltaics: Research and Applications

Volume

24

Issue

8

First page number:

1142

Last page number:

1148

Abstract

The electronic band alignment of the Zn(O,S)/Cu(In,Ga)Se2 interface in high-efficiency thin-film solar cells was derived using X-ray photoelectron spectroscopy, ultra-violet photoelectron spectroscopy, and inverse photoemission spectroscopy. Similar to the CdS/Cu(In,Ga)Se2 system, we find an essentially flat (small-spike) conduction band alignment (here: a conduction band offset of (0.09 ± 0.20) eV), allowing for largely unimpeded electron transfer and forming a likely basis for the success of high-efficiency Zn(O,S)-based chalcopyrite devices. Furthermore, we find evidence for multiple bonding environments of Zn and O in the Zn(O,S) film, including ZnO, ZnS, Zn(OH)2, and possibly ZnSe. Copyright © 2016 John Wiley & Sons, Ltd. Copyright © 2016 John Wiley & Sons, Ltd.

Keywords

alternative buffer layers; band alignment; chalcopyrite thin-film solar cell; inverse photoemission; X-ray spectroscopy; Zn(O; S)

Language

English

Repository Citation

Mezher, M., Garris, R., Mansfield, L. M., Horsley, K., Weinhardt, L., Duncan, D. A., Blum, M., Rosenberg, S. G., Bär, M., Ramanathan, K., Heske, C. (2016). Electronic structure of the Zn(O,S)/Cu(In,Ga)Se2 thin-film solar cell interface. Progress in Photovoltaics: Research and Applications, 24(8), 1142-1148.
http://dx.doi.org/10.1002/pip.2764