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Enhanced performance of self-assembled Ge-dots in Si thin film solar cells

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5 Author(s)
Presting, H. ; DaimlerChrysler Res. Center, Ulm, Germany ; Konle, J. ; Kibbel, H. ; Uebele, P.
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Germanium (Ge)-islands have been deposited by MBE on silicon (Si)-substrates to enhance the efficiency of Si thin film solar cells. The islands are deposited in the Stranski-Krastanow growth mode on a standard 10Ωcm, p-type Si substrate and form the base of the solar cell. We employed Sb as surfactant to achieve rather high island densities (>1011 cm-2, typical lateral width 20nm and heights 3nm). Up to 75 Ge layers with 8 monolayers (ML) Ge each separated by a thin (9nm-18nm) undoped Si buffer layer have been stacked on top of each other. On top of it we deposited 200nm undoped Si layer into which we performed an n+ emitter diffusion. Preliminary measurements show a reduced open circuit voltage but an enhancement of the short circuit current in the infrared regime with an efficiency of about 12%.

Published in:

Photovoltaic Specialists Conference, 2002. Conference Record of the Twenty-Ninth IEEE

Date of Conference:

19-24 May 2002

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