brown_qdphoto_02

Figure 2: a) Current-voltage characteristics of a ZnO/PbS QD heterojunction photovoltaic device, where ligand exchange has been performed with EDT (blue trace) or BDT (red trace). BDT treatment simultaneously increases the fill factor, open-circuit voltage, and efficiency. b) Transient photovoltage response of the device, demonstrating a reduced recombination rate (krec) for BDT-treated devices relative to EDT-treated devices.

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