Charge Transfer Dynamics in Cadmium Chalcogenide Quantum Dots based Heterostructures
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Quantum confinement effects in semiconductor nanocrystals or quantum dots (QDs) give rise to unusual electronic properties such as, size dependent bandgaps, high molar absorptivities and in some cases, hot carrier extraction and multi-exciton generation, which makes them suitable to harvest solar energy. Competition between charge transfer and electron-hole recombination determines the efficiency of charge separation and thus the performance of QDs based electronic devices. Compared to the bulk semiconductors, surface of QDs significantly affects the opto-electronic properties of QDs due to high surface to volume ratios. The difference in the chemical environment of the surface atoms with that of bulk results in mid-gap states which can trap photoexcited charge carriers. This dissertation explores the role of these surface states in charge transfer and draws comparisons with charge transfer from band edge states.