Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Energy conversion processes in semiconductor nanocrystals typically occur with non-unity yields. Much of the losses involve the generation of heat, for example via electronic relaxation after photoexcitation. Surprisingly, a central question remains unanswered: how can we dispose of (or maintain) this heat? The present lack of an answer to this question hinders the development of more efficient and stable optoelectronic (or thermoelectric) devices. In this study, we discuss the possibility of heat dissipation from a nanocrystal to surrounding solvent molecules, via excitation of solvent vibrational modes. Results on CdSe nanocrystals using femtosecond stimulated Raman spectroscopy suggest that this process occurs on a (sub-)picosecond time scale. We end with a short discussion of the prospect and limitations of this methodology. As such, we take the first steps towards a better control of heat dissipation in devices such as thermoelectrics, LEDs, or solar cells.
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