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• W2213961196 abstract "Hot carrier solar cell (HCSC) is a promising third generation photovoltaic device which can potentially able to overcome the Shockley-Queisser limit and achieve much higher power efficiency than present single junction solar cells. The theoretical efficiency for an ideal HCSC is predicted to be 65% under 1 sun solar radiation or 85% under maximal concentration. A critical requirement of the absorber is to slow down the cooling rate of photoexcited hot carriers, from few ps for typical semiconductors to hundreds of ps or longer. Transition nitrides HfN and ZrN theoretically have large phononic bandgaps and thus much slowed cooling time may be expected in these materials. In this investigation ultrafast transient absorption (TA) was used to investigate HfN and ZrN thin films. Experiments reveal three featured TA bands in the visible and near infrared, ascribed to the excited state absorption and bleaching. Cooling time of hot carriers as long as 3 ns in HfN is attributed to the significantly suppressed Klemens' decay. While hundreds of ps cooling time were observed in ZrN. The slowed thermalization process in HfN and ZrN suggests these bulk materials are a promising absorber candidate for hot carrier solar cells." @default.
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• W2213961196 date "2015-06-01" @default.
• W2213961196 modified "2023-09-25" @default.
• W2213961196 title "Ultrafast transient absorption study of hot carrier dynamics in hafnium nitride and zirconium nitride" @default.
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• W2213961196 doi "https://doi.org/10.1109/pvsc.2015.7356012" @default.
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