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High Efficiency CdTe/CdS Thin Film Solar Cells with a Novel Back Contact  (2007)

Authors:
N., Romeo; A., Bosio; S., Mazzamuto; Romeo, Alessandro; L., Vaillant Roca
Title:
High Efficiency CdTe/CdS Thin Film Solar Cells with a Novel Back Contact
Year:
2007
Type of item:
Contributo in atti di convegno
Tipologia ANVUR:
Contributo in Atti di convegno
Language:
Inglese
Format:
Elettronico
Congresso:
22nd European Photovoltaic Solar Energy Conference
Place:
Milan, Italy
Period:
3-7 September 2007
Publisher:
WIP-Renewable Energies
ISBN:
3936338221
Page numbers:
1919-1921
Keyword:
solar cells;; CdTe; Thin films
Short description of contents:
The back contact is probably the most critical step in the fabrication of high efficiency CdTe/CdS thin film solar cells. Usually, it is done first by etching the CdTe surface in order to form a Te rich surface and second by depositing a small amount of Cu, on the order of 2nm, on top of etched CdTe surface. In this way a CuxTe layer forms that seems to behave as a non rectifying contact for CdTe. If more copper is used, there is the risk that Cu in excess diffuses into the CdTe/CdS structure causing shunt paths by segregating into the grain boundaries or lowering the cell efficiency by doping CdS thus increasing its resistivity. In this paper, we propose a novel approach to avoid the Cu diffusion. First of all we do not etch the CdTe surface, second we deposit on top of a not etched surface 100-200nm of a buffer layer, that is As2Te3, followed by the deposition of 10-20nm of Cu. If the deposition of Cu is done at 150-200°C substrate temperature, a reaction between Cu and As2Te3 happens that forms a CuxTe layer by a substitution reaction. This type of contact resulted to be stable and non rectifying.
Product ID:
39852
Handle IRIS:
11562/314194
Deposited On:
July 11, 2012
Last Modified:
March 20, 2018
Bibliographic citation:
N., Romeo; A., Bosio; S., Mazzamuto; Romeo, Alessandro; L., Vaillant Roca, High Efficiency CdTe/CdS Thin Film Solar Cells with a Novel Back Contact  in Proceedings of 22nd European Photovoltaic Solar Energy ConferenceWIP-Renewable EnergiesProceedings of "22nd European Photovoltaic Solar Energy Conference" , Milan, Italy , 3-7 September 2007 , 2007pp. 1919-1921

Consulta la scheda completa presente nel repository istituzionale della Ricerca di Ateneo IRIS

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Title Department Managers
Caratterizzazione elettronica di Celle Solari ad alta efficienza di CdTe/CdS Department Informatica Alessandro Romeo
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