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Creators/Authors contains: "McCandless, Brian"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Solar Energy Materials and Solar Cells)
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  2. ; ; ; ; ; ; ; ; ; ; et al (, Nano Letters)
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  3. ; ; ; ; (, Conference record of the IEEE Photovoltaic Specialists Conference)
    We demonstrate the use of time-resolved terahertz spectroscopy coupled with numerical modeling of the transport equations to elucidate photoexcited carrier dynamics in a photovoltaic absorber. By measuring a high-quality Cu2ZnSnSe4 single crystal that exhibited device efficiency of 8.6%, we show that critical parameters including mobility, surface recombination velocity, and Shockley-Read-Hall lifetime can be obtained. Mobility values of 80 cm2/Vs were validated with Hall effect measurements. Surface recombination velocity could be reduced by at least two orders of magnitude, to 10^4 cm/s, with appropriate chemical and mechanical polishing. Carrier lifetimes exceeding 10 ns indicate promise for devices with high photovoltage. Terahertz spectroscopy provides complementary insight to conventional time-resolved photoluminescence and is particularly valuable for materials that are not strongly emissive. 
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