Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.116
Publication date: 6th July 2018
The rapid development of colloidally synthesized, two-dimensional nanoplatelets with precise thickness-tunable, narrow band-edge absorption and photoluminescence unlock several classes of investigations. We have examined charge and energy transfer involving these structures for purposes of energy capture and conversion and lighting. Particularly fast transfer of excitations between self-assembled, co-facial arrangements of thinner donor and thicker acceptor structures is found and modeled. Electron transfer rates for four isoenergetic donor–acceptor pairs comprising a well-known molecular electron acceptor and controlled lateral extents of nanoparticles, examined via ultrafast photoluminescence, relate a dependence of charge transfer rate on the spatial extent of the electron–hole pair wave function explicitly. A nonlinear dependence of rate with surface area is attributed to exciton delocalization within each structure, which we show via temperature-dependent absorption measurements remains constant.
The rapid development of colloidally synthesized, two-dimensional nanoplatelets with precise thickness-tunable, narrow band-edge absorption and photoluminescence unlock several classes of investigations. We have examined charge and energy transfer involving these structures for purposes of energy capture and conversion and lighting. Particularly fast transfer of excitations between self-assembled, co-facial arrangements of thinner donor and thicker acceptor structures is found and modeled. Electron transfer rates for four isoenergetic donor–acceptor pairs comprising a well-known molecular electron acceptor and controlled lateral extents of nanoparticles, examined via ultrafast photoluminescence, relate a dependence of charge transfer rate on the spatial extent of the electron–hole pair wave function explicitly. A nonlinear dependence of rate with surface area is attributed to exciton delocalization within each structure, which we show via temperature-dependent absorption measurements remains constant.
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