Investigation of physical properties of mesoporous NANO-Ti02 for dye-solar
type: CreativeWork
description: The nanocrystalline dye sensitized solar cells, so called «Gratzel cells* are based on a wide band gap «3.0-3.2eV» semiconductor TiO2 in its nano-scaled form. These nano-sized TiO2 are sensitized by a dye monolayer so to increase its spectral response and are immersed in a redox electrolyte for charge transfer. At the present moment, the best overall sunlight to electrical energy conversion efficiency under direct and diffuse sunlight laboratory devices is about 7-11%. It is well acknowledged in the literature that the low efficiency of standard large dimension Gratzel solar cell which varies in the range of 2-5% is caused by the excitonic fast recombination. In order to improve this conversion efficiency and reach values comparable with standard PV technologies, it is necessary to minimize this charge recombination at TiO2-dye interface in addition to an optimized optical path management. The conversion efficiency is related to the Incident Photon-Current Efficiency «IPCE» via the charge carrier free mean path «L» and the absorption coefficient or of the dye-TiO2 system. IPCE = 7—f Where L is related to charge carrier lifetime «£» and its diffusion constant «D» and mobility «u»: Hence nano-TiO2 with substantial shape anisotropy such as TiO2 nanorods/ nanotubes or 1-D porous TiO2 structures would exhibit less interfacial scattering as a result of a larger lifetime and efficient light trapping. This trapping effect would offer a better electron transport in the nano-TiO2 electrodes as a result of faster photoresponse and higher electron collection efficiency. This research project focuses mainly on engineering meso-porous 1-D type TiO2 n a no-structures with an obvious shape anisotropy for possible application in DSCs application which is expected to minimize the fast electron/hole pair recombination process. In this work we report the high-density arrays of mesoporous anatase TiO2 nano-structures derived using the combination of Evaporation Induced Self-Assembly (EI…
abstract: The nanocrystalline dye sensitized solar cells, so called «Gratzel cells* are based on a wide band gap «3.0-3.2eV» semiconductor TiO2 in its nano-scaled form. These nano-sized TiO2 are sensitized by a dye monolayer so to increase its spectral response and are immersed in a redox electrolyte for charge transfer. At the present moment, the best overall sunlight to electrical energy conversion efficiency under direct and diffuse sunlight laboratory devices is about 7-11%. It is well acknowledged in the literature that the low efficiency of standard large dimension Gratzel solar cell which varies in the range of 2-5% is caused by the excitonic fast recombination. In order to improve this conversion efficiency and reach values comparable with standard PV technologies, it is necessary to minimize this charge recombination at TiO2-dye interface in addition to an optimized optical path management. The conversion efficiency is related to the Incident Photon-Current Efficiency «IPCE» via the charge carrier free mean path «L» and the absorption coefficient or of the dye-TiO2 system. IPCE = 7—f Where L is related to charge carrier lifetime «£» and its diffusion constant «D» and mobility «u»: Hence nano-TiO2 with substantial shape anisotropy such as TiO2 nanorods/ nanotubes or 1-D porous TiO2 structures would exhibit less interfacial scattering as a result of a larger lifetime and efficient light trapping. This trapping effect would offer a better electron transport in the nano-TiO2 electrodes as a result of faster photoresponse and higher electron collection efficiency. This research project focuses mainly on engineering meso-porous 1-D type TiO2 n a no-structures with an obvious shape anisotropy for possible application in DSCs application which is expected to minimize the fast electron/hole pair recombination process. In this work we report the high-density arrays of mesoporous anatase TiO2 nano-structures derived using the combination of Evaporation Induced Self-Assembly (EI…
author: Mhlongo, Hlengiwe Gugu
keywords: Mesoporous nano-Ti02, Dye-solar
license: https://devspace.unizulu.ac.za/bitstreams/d3f230f3-b2f5-4843-af61-e02f59567df6/download
date published: 2008
date modified: 2026-07-24T06:17:06Z
provider: University of Zululand
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Zululand