Quantum dot solar cells. Tuning photoresponse through size and shape control of CdSe-TiO2 architecture.
By Anusorn Kongkanand, K. Tvrdy, K. Takechi, M. Kuno, Prashant Kamat. Journal of the American Chemical Society, 2008
1,550 citations recorded by the source corpus.
Different-sized CdSe quantum dots have been assembled on TiO2 films composed of particle and nanotube morphologies using a bifunctional linker molecule. Upon band-gap excitation, CdSe quantum dots inject electrons into TiO2 nanoparticles and nanotubes, thus enabling the generation of photocurrent in a photoelectrochemical solar cell. The results presented in this study highlight two major findings: (i) ability to tune the photoelectrochemical response and photoconversion efficiency via size control of CdSe quantum dots and (ii) improvement in the photoconversion efficiency by facilitating the charge transport through TiO2 nanotube architecture. The maximum IPCE (photon-to-charge carrier generation efficiency) obtained with 3 nm diameter CdSe nanoparticles was 35% for particulate TiO2 and 45% for tubular TiO2 morphology. The maximum IPCE observed at the excitonic band increases with decreasing particle size, whereas the shift in the conduction band to more negative potentials increases the driving force and favors fast electron injection. The maximum power-conversion efficiency </=1% obtained with CdSe-TiO2 nanotube film highlights the usefulness of tubular morphology in facilitating charge transport in nanostructure-based solar cells. Ways to further improve power-conversion efficiency and maximize light-harvesting capability through the construction of a rainbow solar cell are discussed.
Subfields: Electrical and Electronic Engineering, Materials Chemistry, Renewable Energy, Sustainability and the Environment
View Paper: https://www.semanticscholar.org/paper/7d37fecc4e6ab4bd0d770f8adef385e785f889b8
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Citations in the corpus
- Annealing effect on photovoltaic performance of CdSe quantum-dots-sensitized TiO 2 nanorod solar cells (2012, background): “As shown by the XRD patterns, SEM images and HRTEM images, this red shift in the annealed samples could be explained by the annealing-induced phase transformation (from cubic to hexagonal) at the elevated temperatures as well as the increase in particle size [20].”
- Colloidal quantum dot solar cells (2011, background): “, 2007) and quantum dot sensitized solar cells (QDSSCs) (Lee et al., 2008a; Kongkanand et al., 2008).”