Nano Archive

Effects of electrode film modifications on the open-circuit photovoltage in enhanced dye-sensitized solar cells

Bwana, Nicholas N. (2009) Effects of electrode film modifications on the open-circuit photovoltage in enhanced dye-sensitized solar cells. Journal of Nanoparticle Research, 11 (8). pp. 1905-1915.

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Official URL: http://www.springerlink.com/content/098643hj44n215...

Abstract

In this study, the open-circuit photovoltage (Voc) decay technique was used to investigate the relationship between the electrode film morphology and the open-circuit photovoltage. Results indicate that dye-sensitized solar cells (DSCs) based on ordered arrays of TiO2 nanostructures (100nm external diameters and 20-50nm internal diameters) generally show higher open-circuit photovoltage (Voc) values than those based on sintered TiO2 nanoparticles (20-40nm diameters). In particular, cells based on thick nanotubules (wall thickness ≥ 45nm in our research) and on nanorods (100nm diameters) show particularly high Voc values, indicating slow recombination kinetics under open-circuit conditions. It can be argued that the nanorods and the thick nanotubules act like singles crystals and therefore the injected electrons in the inner TiO2 molecules are shielded from holes in the electrolyte under open-circuit conditions. The open-circuit recombination time constant of electrons accumulated in the TiO2 conduction band is therefore prolonged and resulting in high Voc values.

Item Type:Article
Uncontrolled Keywords:Nanorods - Nanotubules - Morphology - Open-circuit - Photovolgate - Recombination - Energy conversion
Subjects:Material Science > Nanofabrication processes and tools
Physical Science > Nanoelectronics
Technology > Manufacturing processes for nanotechnology
Technology > Nanotechnology and energy applications
ID Code:7977
Deposited By:IoN
Deposited On:05 Jan 2010 14:13
Last Modified:05 Jan 2010 14:13

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