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Cadmium Tin Oxide and Zinc Magnesium Oxide Prepared by Hollow Cathode Sputtering for CdTe Photovoltaics

Published online by Cambridge University Press:  05 June 2017

Alan E. Delahoy ,
Shou Peng ,
Payal Patra ,
Surya Manda ,
Akash Saraf ,
Yunfei Chen ,
Xuehai Tan  and
Ken K. Chin
Alan E. Delahoy*
Affiliation:
CNBM New Energy Materials Research Center, Department of Physics, New Jersey Institute of Technology, Newark, NJ, USA
Shou Peng
Affiliation:
Bengbu Design and Research Institute for Glass Industry, Bengbu, China China Triumph International Engineering Co. Ltd., Shanghai, China
Payal Patra
Affiliation:
New Jersey Innovation Institute, Newark, NJ, USA
Surya Manda
Affiliation:
CNBM New Energy Materials Research Center, Department of Physics, New Jersey Institute of Technology, Newark, NJ, USA
Akash Saraf
Affiliation:
CNBM New Energy Materials Research Center, Department of Physics, New Jersey Institute of Technology, Newark, NJ, USA
Yunfei Chen
Affiliation:
CNBM New Energy Materials Research Center, Department of Physics, New Jersey Institute of Technology, Newark, NJ, USA
Xuehai Tan
Affiliation:
CNBM New Energy Materials Research Center, Department of Physics, New Jersey Institute of Technology, Newark, NJ, USA
Ken K. Chin
Affiliation:
CNBM New Energy Materials Research Center, Department of Physics, New Jersey Institute of Technology, Newark, NJ, USA
*
*(Email: delahoy@njit.edu)
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Abstract

This work reports the fabrication and characterization of superstrate-type Zn1-xMgxO/CdTe heterojunction solar cells on both CdxSnyO and commercial SnO2:F transparent conducting oxides (TCOs) in which the ZMO and CTO layers are produced for the first time by hollow cathode sputtering. The sputtering is conducted in a reactive mode using metal or alloyed metal targets fitted to a custom-made linear cathode. It is notable that the CdS buffer layer conventionally employed in CdTe solar cells is entirely replaced by the ZMO window layer. The use of ZMO is found to eliminate the blue loss associated with CdS optical absorption and further results in a higher open-circuit voltage. Key parameters were found to be the conduction band offset at the ZMO/CdTe interface and the ZMO thickness. It was discovered that the ZMO exhibits intense photoluminescence even at room temperature. Most of the solar cells were fabricated in the FTO/ZMO/CdTe configuration although CTO/ZMO/CdTe solar cells were also demonstrated. The CTO was produced with an electron mobility of 46 cm2 V-1s-1 without any post-deposition annealing or treatment.

Keywords

photovoltaicthin filmsputtering
Type
Articles
Information
MRS Advances , Volume 2 , Issue 53: Energy Storage and Conversion , 2017 , pp. 3203 - 3214
Copyright
Copyright © Materials Research Society 2017 

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