Impact of capping agent on the electron transfer dynamics of CdTe QDs with methyl viologen

Jhonsi, Mariadoss Asha; Thulasi, Sekar; Kathiravan, Arunkumar

doi:10.1016/j.jlumin.2016.06.022

Cited by 6 publications

(1 citation statement)

References 42 publications

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“…The electron transfer (ET) process is one of the most fundamental mechanisms in quantum dots (QDs), which are used for a wide range of nanotechnology applications such as bioimaging 1–4 , lasing 5–7 , light-emitting diodes 8–10 , molecular device operation 11–13 , and solar cells 14–17 . The ET process from photoexcited QDs to external acceptors through an interface 18,19 is one of the primary mechanisms associated with the functionality and efficiency of QD devices.…”

Section: Introductionmentioning

confidence: 99%

Tunable electron transfer rate in a CdSe/ZnS-based complex with different anthraquinone chloride substitutes

Zhao

Sun

Yin

et al. 2019

Sci Rep

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We use femtosecond transient absorption spectroscopy to study ultrafast electron transfer (ET) dynamics in a model donor and acceptor system using CdSe/ZnS core/shell structure quantum dots (QDs) as donors and anthraquinone (AQ) molecules as acceptors. The ET rate can be enhanced by decreasing the number of chlorine substituents in the AQ molecules because that increases the driving force, which is the energy level offset between the conduction band energy of CdSe/ZnS and the lowest upper molecular orbital potential of AQ derivatives, as confirmed by cyclic voltammetry measurements. However, the electronic coupling between the QDs and AQ derivatives, and the sum of reorganization energy of AQ molecules and solvent calculated by density functional theory are not the main reasons for the change in ET rate in three systems. Our findings provide new insights into selecting an acceptor molecule and will be useful in tuning ET processes for advanced QD-based applications.

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