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Material Properties - Short Circuit Current Correlations in Quantum Dot Solar Cell

Saifful Kamaluddin, Muzakir and Rajan, Jose (2014) Material Properties - Short Circuit Current Correlations in Quantum Dot Solar Cell. In: Proceedings of 8th Malaysian Technical Universities Conference on Engineering & Technology (MUCET 2014) , 10-11 November 2014 , Mahkota Hotel Bandar Hilir Melaka. . (In Press)

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Abstract

Quantum dots (QDs) semiconductor of size below its exciton Bohr radius shows fascinating effect of quantum confinement i.e., multiple exciton generation (MEG) upon absorption of single photon with sufficient energy. However despite of the remarkable properties, application of QDs for replacement of dye molecules as light absorber in quantum dot solar cell (QDSC) is still doubtful due to inferior power conversion efficiency (~8.6%) in comparison with the dye-sensitized solar cell (DSSC) (~13%). In order to study the drawback that arises from the light absorber, three QDs were employed for QDSC fabrication viz., CdSe, CdTe and CuInS2; layered onto TiO2 photoelectrode by direct attachment, ligand–functionalization and paste–layering. Additionally, Z907–based DSSC was fabricated in order to strengthen the conclusion on the correlation between absorption cross-section of fluorophore and the short circuit current of cell. Five efficiency-affecting parameters are studied i.e., (i) ligand usage, (ii) QDs size distribution, (iii) redox potential of electrolyte, (iv) electronic stability of QDs and (v) absorption cross-section by electrochemical measurements, absorption spectroscopy, photoluminescence spectroscopy and quantum chemical ab-initio calculations. Significant setbacks were observed, i.e., (i) inefficient electron injection through ligand, (ii) unnecessary self-injection from small to big cluster of QDs, (iii) inefficient electron replenishment at HOMOQDs by electrolyte, (iv) non-uniform and uneven excited-state electron distribution of QDs cluster that leads to inefficient electron injection from LUMOQDs to LUMOphotoelectrode and (v) low absorption cross-section than that of Z907 dye.

Item Type: Conference or Workshop Item (Speech)
Subjects: Q Science > QD Chemistry
Q Science > QC Physics
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Dr. Saifful Kamaluddin Muzakir @ Lokman
Date Deposited: 17 Dec 2014 03:13
Last Modified: 03 Oct 2018 08:54
URI: http://umpir.ump.edu.my/id/eprint/7470
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