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Issue 11, 2015
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Photovoltaic effect in individual asymmetrically contacted lead sulfide nanosheets

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Abstract

Solution-processable, two-dimensional semiconductors are promising optoelectronic materials which could find application in low-cost solar cells. Lead sulfide nanocrystals raised attention since the effective band gap can be adapted over a wide range by electronic confinement and observed multi-exciton generation promises higher efficiencies. We report on the influence of the contact metal work function on the properties of transistors based on individual two-dimensional lead sulfide nanosheets. Using palladium we observed mobilities of up to 31 cm2 V−1 s−1. Furthermore, we demonstrate that asymmetrically contacted nanosheets show photovoltaic effect and that the nanosheets’ height has a decisive impact on the device performance. Nanosheets with a thickness of 5.4 nm contacted with platinum and titanium show a power conversion efficiency of up to 0.94% (EQE 75.70%). The results underline the high hopes put on such materials.

Graphical abstract: Photovoltaic effect in individual asymmetrically contacted lead sulfide nanosheets

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Publication details

The article was received on 24 Nov 2014, accepted on 29 Jan 2015 and first published on 12 Feb 2015


Article type: Communication
DOI: 10.1039/C4NR06957A
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Citation: Nanoscale, 2015,7, 4875-4883
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    Photovoltaic effect in individual asymmetrically contacted lead sulfide nanosheets

    S. Dogan, T. Bielewicz, V. Lebedeva and C. Klinke, Nanoscale, 2015, 7, 4875
    DOI: 10.1039/C4NR06957A

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