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Synthesis of silver quantum dots decorated TiO sub(2) nanotubes and their incorporation in organic hybrid solar cells
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Synthesis of silver quantum dots decorated TiO sub(2) nanotubes and their incorporation in organic hybrid solar cells
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Journal Article
Synthesis of silver quantum dots decorated TiO sub(2) nanotubes and their incorporation in organic hybrid solar cells
2013
Overview
Uniform silver quantum dots decorated TiO sub(2) nanotubes (Ag-TiO sub(2) NTs) were synthesized via a simple reduction reaction in ethanol solvent. The size distribution of composite NTs arranges from 3 to 5 nm for Ag quantum dots and about 10 nm for TiO sub(2) NTs in diameter. The composite Ag-TiO sub(2) nanoparticles were incorporated in organic hybrid solar cells through doping into the active layer. Both the optical and electrical properties of the solar cells were improved. The photocurrent and fill factor of the devices were obviously increased after the Ag-TiO sub(2) NTs were introduced, accompanied with a greatly reduced series resistance as well as enlarged shunt resistance. Suppressed recombination due to efficient charge transfer from plasmonic Ag quantum dots to the attached TiO sub(2) NTs made contribution to the charge collection and transportation so that the fill factor was increased. Meanwhile, the enhanced light absorption resulted from effective incident light scattering by the Ag-TiO sub(2) NTs composite played a role in increasing photocurrent. As a result, solar cells with Ag-TiO sub(2) NTs generated an enhanced conversion efficiency up to 20 and 50 % compared to that adopting TiO sub(2) NTs and that without doping, respectively.
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