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|Title: ||Structural and chemical characterization of the back contact region in high efficiency CdTe solar cells|
|Authors: ||Abbas, Ali|
Meysing, Daniel M.
Beach, Joseph D.
Barnes, Teresa M.
Wolden, Colin A.
|Keywords: ||CdTe solar cells|
|Issue Date: ||2015|
|Publisher: ||© IEEE|
|Citation: ||ABBAS, A. ... et al, 2015. Structural and chemical characterization of the back contact region in high efficiency CdTe solar cells. IN: Proceedings of the 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC), New Orleans.|
|Abstract: ||Cadmium telluride (CdTe) is the leading
commercialized thin-film photovoltaic technology. Copper is
commonly used in back contacts to obtain high efficiency, but has
also been implicated as a harmful factor for device stability. T hus
it is critical to understand its composition and distribution within
complete devices. In this work the composition and structure of
the back contact region was examined in high efficiency devices
(-16%) contacted using a ZnTe:Cu buffer layer followed by gold
metallization. T he microstructure was examined in the asdeposited
state and after rapid thermal processing (RTP) using
high resolution transmission electron microscopy and EDX
chemical mapping. After RTP the ZnTe exhibits a bilayer
structure with polycrystalline, twinned grains adjacent to Au and
an amorphous region adjacent to CdTe characterized by extensive
Cd-Zn interdiffusion. T he copper that is co-deposited uniformly
within ZnTe is found to segregate dramatically after RTP
activation, either collecting near the ZnTe/Au interface or forming
CUxTe clusters in CdTe at defects or grain boundaries near the
interface with ZnTe. Chlorine, present throughout CdTe and
concentrated at grain boundaries, does not penetrate significantly
into the back contact region during RTP activation.|
|Description: ||© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.|
|Sponsor: ||We gratefully acknowledge the Bay Area Photovoltaic
Consortium for their support of the work performed at CSM
under U.S. Department of Energy Award number DEEE0004946.
Work at NREL was funded by the U.S.
Department of Energy SunShot Foundational Program to
Advance Cell Efficiency (F-PACE) under Contract No. DEAC36-
08-G028308. The Loughborough research was funded
by UKERC through the EPSRC Supergen SuperSolar Hub.|
|Version: ||Accepted for publication|
|Publisher Link: ||http://dx.doi.org/10.1109/PVSC.2015.7355622|
|Appears in Collections:||Conference Papers and Contributions (CREST)|
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