Simultaneous Determination of the Adsorption Constant and the Photoinduced Electron Transfer Rate for a Cds Quantum Dot–Viologen Complex

2011 ◽  
Vol 133 (26) ◽  
pp. 10146-10154 ◽  
Author(s):  
Adam J. Morris-Cohen ◽  
Matthew T. Frederick ◽  
Laura C. Cass ◽  
Emily A. Weiss
Keyword(s):  
Electron Transfer ◽  
Quantum Dot ◽  
Simultaneous Determination ◽  
Photoinduced Electron Transfer ◽  
Transfer Rate ◽  
Electron Transfer Rate ◽  
Cds Quantum Dot

Efficient photoinduced electron transfer between C60/C70 and zinc octaethylporphyrin studied by nanosecond laser photolysis method

2000 ◽  
Vol 04 (06) ◽  
pp. 591-598 ◽  
Author(s):  
MOHAMED E. EL-KHOULY ◽  
MAMORU FUJITSUKA ◽  
OSAMU ITO
Keyword(s):  
Electron Transfer ◽  
Rate Constants ◽  
Photoinduced Electron Transfer ◽  
Transfer Rate ◽  
Transient Absorption ◽  
Laser Light ◽  
Solvent Polarity ◽  
Nanosecond Laser ◽  
Electron Transfer Rate ◽  
Absorption Bands

Photoinduced electron-transfer processes between C 60 or C 70 and zinc octaethylporphyrin ( ZnOEP ) have been studied in polar solvents with the nanosecond laser flash photolysis method, observing the transient absorption spectra in the visible and near-IR regions. By the predominant excitation of ZnOEP with 532 nm laser light the transient absorption bands of 3 ZnOEP * decayed, accompanied by the appearance of the transient absorption bands of [Formula: see text] and [Formula: see text]. By the predominant excitation of C 60 and C 70 with 610 nm laser light the decays of [Formula: see text] and [Formula: see text] were observed, accompanied by the appearance of [Formula: see text] and [Formula: see text]. The electron transfer rate constants (k et ) and the quantum yields (Φ et ) of [Formula: see text] and [Formula: see text] formation via 3 ZnOEP * and [Formula: see text] or [Formula: see text] have been evaluated. These values increase with the solvent polarity; in polar benzonitrile these values are higher than for other porphyrins such as zinc tetraphenylporphyrin. The back electron transfer rate constants were evaluated from the decays of [Formula: see text] and [Formula: see text], which also show a solvent polarity dependence.

Determination of electron-transfer rate constants from data on tunneling to randomly distributed acceptors in a rigid medium

1982 ◽  
Vol 86 (2) ◽  
pp. 200-203 ◽  
Author(s):  
R. Kurt Huddleston ◽  
John R. Miller
Keyword(s):  
Electron Transfer ◽  
Rate Constants ◽  
Transfer Rate ◽  
Electron Transfer Rate

scholarly journals Photoinduced electron transfer from semiconductor quantum dots to metal oxide nanoparticles

2010 ◽  
Vol 108 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Kevin Tvrdy ◽  
Pavel A. Frantsuzov ◽  
Prashant V. Kamat
Keyword(s):  
Electron Transfer ◽  
Quantum Dot ◽  
Metal Oxide ◽  
Transfer Rate ◽  
Metal Oxide Nanoparticles ◽  
Strong Dependence ◽  
Hot Electron ◽  
Electron Transfer Rate ◽  
Metal Oxide Nanoparticle ◽  
Oxide Nanoparticle

Quantum dot-metal oxide junctions are an integral part of next-generation solar cells, light emitting diodes, and nanostructured electronic arrays. Here we present a comprehensive examination of electron transfer at these junctions, using a series of CdSe quantum dot donors (sizes 2.8, 3.3, 4.0, and 4.2 nm in diameter) and metal oxide nanoparticle acceptors (SnO2, TiO2, and ZnO). Apparent electron transfer rate constants showed strong dependence on change in system free energy, exhibiting a sharp rise at small driving forces followed by a modest rise further away from the characteristic reorganization energy. The observed trend mimics the predicted behavior of electron transfer from a single quantum state to a continuum of electron accepting states, such as those present in the conduction band of a metal oxide nanoparticle. In contrast with dye-sensitized metal oxide electron transfer studies, our systems did not exhibit unthermalized hot-electron injection due to relatively large ratios of electron cooling rate to electron transfer rate. To investigate the implications of these findings in photovoltaic cells, quantum dot-metal oxide working electrodes were constructed in an identical fashion to the films used for the electron transfer portion of the study. Interestingly, the films which exhibited the fastest electron transfer rates (SnO2) were not the same as those which showed the highest photocurrent (TiO2). These findings suggest that, in addition to electron transfer at the quantum dot-metal oxide interface, other electron transfer reactions play key roles in the determination of overall device efficiency.

Influence of linker molecules on interfacial electron transfer and photovoltaic performance of quantum dot sensitized solar cells

2014 ◽  
Vol 2 (48) ◽  
pp. 20882-20888 ◽  
Author(s):  
Junwei Yang ◽  
Takuya Oshima ◽  
Witoon Yindeesuk ◽  
Zhenxiao Pan ◽  
Xinhua Zhong ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Solar Cells ◽  
Quantum Dot ◽  
Transfer Rate ◽  
Photovoltaic Performance ◽  
Interfacial Electron Transfer ◽  
Electron Transfer Rate ◽  
Linker Molecules ◽  
Sensitized Solar Cells

The influence of linker molecules on the electron transfer rate and photovoltaic performance of the resultant QDSCs has been investigated.

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