Thursday, December 10, 2015

Abstract-Broadband ultra-high transmission of terahertz radiation through monolayer MoS2

We used time-resolved terahertz spectroscopy to study ultrafast photoconductivity of polycrystallinethin-film silicon solar cells. We selected a series of samples, which exhibited variable conversion efficiencies due to hydrogen plasmapassivation under various technological conditions. The decay of the transient terahertz conductivity shows two components: the fast one is related to the charge recombination at interfaces, while the slow nanosecond one is attributed to the trapping of photocarriers by defects localized at grain boundaries or at dislocations in the polycrystalline p layer of the structure. We observed a clear correlation between the open-circuit voltage and the nanosecond-scale decay time of the transient terahertz conductivity of the solar cells. Thus, the terahertz spectroscopy appears to be a useful contactless tool for inspecting the local photoconductivity of solar cells including, in particular, various nanostructured schemes.

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