Fortification of CdSe Quantum Dots with Graphene Oxide. Excited State Interactions and Light Energy Conversion

作者：Lightcap, Ian V.; Kamat, Prashant V.^*

来源：Journal of the American Chemical Society, 2012, 134(16): 7109-7116.

DOI：10.1021/ja3012929

• SENSITIZED SOLAR-CELLS
• LITHIUM ION BATTERIES
• COUNTER ELECTRODE
• PHOTOCATALYTIC REDUCTION
• PHOTOVOLTAIC DEVICES
• TIO2 FILMS
• COMPOSITE
• NANOPARTICLES
• NANOCRYSTALS
• EFFICIENCY

Graphene based 2-D carbon nanostructures provide new opportunities to fortify semiconductor based light harvesting assemblies. Electron and energy transfer rates from photoexcited CdSe colloidal quantum dots (QDs) to graphene oxide (GO) and reduced graphene oxide (RGO) were isolated by analysis of excited state deactivation lifetimes as a function of degree of oxidation and charging in (R)GO. Apparent rate constants for energy and electron transfer determined for CdSe-GO composites were 5.5 x 10(8) and 6.7 x 10(8) s(-1), respectively. Additionally, incorporation of GO in colloidal CdSe QD films deposited on conducting glass electrodes was found to enhance the charge separation and electron conduction through the QD film, thus allowing three-dimensional sensitization. Photoanodes assembled from CdSe-graphene composites in quantum dot sensitized solar cells display improved photocurrent response (similar to 150%) over those prepared without GO.

• 出版日期2012-4-25