arXiv 1507.044952015-07-16cond-mat.mtrl-sci

Photovoltaic effect in individual asymmetrically contacted lead sulfide nanosheets

Sedat Dogan, Thomas Bielewicz, Vera Lebedeva, Christian Klinke

发表信息：: Nanoscale 7 (2015) 4875
DOI：: 10.1039/c4nr06957a

英文摘要：

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/Vs. 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 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.

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