Publications

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:

October 28, 2022

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 Conference , WIP-Renewable Energies , Proceedings of "22nd European Photovoltaic Solar Energy Conference" , Milan, Italy , 3-7 September 2007 , 2007 , pp. 1919-1921

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