Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 23, Pages 12681-12688Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4040224
Keywords
CuInS2 quantum dots; TiO2; electron transfer; band alignment; defect states
Funding
- National Natural Science Foundation of China [11274304, 61205025, 51102227, 11204298]
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Photoinduced electron transfer (ET) processes from CuInS2/CdS core/shell quantum dots (QDs) with different core sizes and shell thicknesses to TiO2 electrodes were investigated by time-resolved photoluminescence (PL) spectroscopy. The ET rates and efficiencies from CuInS2/CdS QDs to TiO2 were superior to those of CuInS2/ZnS QDs. An enhanced ET efficiency was surprisingly observed for 2.0 nm CuInS2 core QDs after growth of the CdS shell. On the basis of the experimental and theoretical analysis, the improved performances of CuInS2/CdS QDs were attributed to the passivation of nonradiative traps by overcoating shell and enhanced delocalization of electron wave function from core to CdS shell due to lower conduction band offset. These results indicated that the electron distribution regulated by the band alignment between core and shell of QDs and the passivation of surface defect states could improve ET performance between donor and acceptor.
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