Abstract
The flow of energy and electron transfer processes in semiconductor nanocrystal based light harvesting assemblies is dictated by the nature of the excited state interactions. Surface interactions of chromophore or redox active molecule which dictate the efficiency of energy/electron transfer thus plays an important role in realizing their photocatalytic and optoelectronic applications. In this presentation we will two specific examples to show the flow of energy and electrons in CsPbBr3 nanocrystals. In the first case, the excited state interactions in the CsPbBr3-Rhodamine B (RhB) hybrid assembly are probed using photoluminescence (PL) and transient absorption measurements. PL studies reveal quenching of the CsPbBr3 emission with a concomitant enhancement of the fluorescence of RhB, indicating a singlet energy transfer mechanism. In the second case we will discuss the factors dictating the electron transfer between CsPbBr3 and surface bound viologen. The implications of electron transfer in photocatalytic applications will be discussed.
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