Incompatible length scales in nanostructured Cu2O solar cells

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MUSSELMAN, Kevin P., Andrew MARIN, Lukas SCHMIDT-MENDE, Judith L. MACMANUS-DRISCOLL, 2012. Incompatible length scales in nanostructured Cu2O solar cells. In: Advanced Functional Materials. 22(10), pp. 2202-2208. ISSN 1616-301X. eISSN 1616-3028. Available under: doi: 10.1002/adfm.201102263

@article{Musselman2012Incom-21617, title={Incompatible length scales in nanostructured Cu2O solar cells}, year={2012}, doi={10.1002/adfm.201102263}, number={10}, volume={22}, issn={1616-301X}, journal={Advanced Functional Materials}, pages={2202--2208}, author={Musselman, Kevin P. and Marin, Andrew and Schmidt-Mende, Lukas and MacManus-Driscoll, Judith L.} }

2013-02-18T09:02:10Z Musselman, Kevin P. Advanced Functional Materials ; 22 (2012), 10. - S. 2202-2208 Marin, Andrew MacManus-Driscoll, Judith L. Schmidt-Mende, Lukas eng Schmidt-Mende, Lukas 2012 2013-02-18T09:02:10Z deposit-license Marin, Andrew MacManus-Driscoll, Judith L. Incompatible length scales in nanostructured Cu<sub>2</sub>O solar cells Musselman, Kevin P. Electrodeposited Cu<sub>2</sub>O-ZnO heterojunctions are promising low-cost solar cells. While nanostructured architectures improve charge collection in these devices, low open-circuit voltages result. Bilayer and nanowire Cu<sub>2</sub>O-ZnO heterojunction architectures are systematically studied as a function of the Cu<sub>2</sub>O layer thickness, ZnO nanowire length, and nanowire seed layer. It is shown that a thick depletion layer exists in the Cu<sub>2</sub>O layer of bilayer devices, owing to the low carrier density of electrodeposited Cu<sub>2</sub>O, such that the predominant charge transport mechanisms in the Cu<sub>2</sub>O and ZnO are drift and diffusion, respectively. This suggests that the low open-circuit voltage of the nanowire cells is due to an incompatibility between the nanostructure spacing required for good charge collection (<1 μm) and the heterojunction thickness necessary to form the full built-in potential that inhibits recombination (>2 μm). The work shows the way to improve low-cost Cu<sub>2</sub>O cells: increasing the carrier concentration or mobility in Cu<sub>2</sub>O synthesized at low temperatures.

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