The electronic structure of the CdS/Cu2ZnSnS4 (CZTS) heterojunction was investigated by direct and inverse photoemission. The effects of a KCN etch of the CZTS absorber prior to CdS deposition on the band alignment at the respective interface were studied. We find a “cliff”-like conduction band offset at the CdS/CZTS interface independent of absorber pretreatment and a significant etch-induced enhancement of the energetic barrier for charge carrier recombination across the CdS/CZTS interface.
Published in:
Applied Physics Letters
(Volume:99
,
Issue:
22
)
Date of Publication:
Nov 2011
- Page(s):
-
222105
-
222105-3
- ISSN :
-
0003-6951
- Digital Object Identifier :
-
10.1063/1.3663327
- Product Type:
-
Journals & Magazines
- Date of Current Version :
-
12 December 2011
- Issue Date :
-
Nov 2011