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Optoelectronic properties of p-i-n heterojunctions based on germanium nanocrystals

We investigated the possibility of using physical vapour deposited Ge nanocrystals (NCs) in optoelectronic devices such as solar cells. We have prepared p-i-n heterojunctions based on p+-doped Si substrate/undoped Ge NCs/ZnO:Al layer stacks and their optoelectronic properties were characterised. Und...

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Bibliographic Details
Published in:Journal of applied physics 2013-07, Vol.114 (3), p.033510_1-6
Main Authors: Parola, S., Quesnel, E., Muffato, V., Xie, L., Leifer, K., Coignus, J., Slaoui, A.
Format: Article
Language:English
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Summary:We investigated the possibility of using physical vapour deposited Ge nanocrystals (NCs) in optoelectronic devices such as solar cells. We have prepared p-i-n heterojunctions based on p+-doped Si substrate/undoped Ge NCs/ZnO:Al layer stacks and their optoelectronic properties were characterised. Under light, the generation of photo-carriers from the Ge NCs themselves was demonstrated. The photovoltaic behaviour of the p-i-n structure was also highlighted, with a measured Voc of 224 mV compared to 580 mV in theory. The discrepancy between theory and experiment was discussed on the basis of TEM observations, optical and carrier generation measurements as well as modelling.
ISSN:0021-8979
1089-7550
1089-7550
DOI:10.1063/1.4813616