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This paper presents the possibility of improving the performance of dye sensitized solar cells (DSSCs) by treating the mesoporous TiO2 using ultra thin metal oxides such as hafnium oxide (HfO2) and aluminum oxide (Al2O3) grown by atomic layer deposition (ALD) method. Ultrathin HfO2 and Al2O3 (few nm in thickness) metal oxide layers affect the density and activity of the interface states at the TiO...
Effect of oxygen (O2) plasma treatment of mesoporous TiO2 photoelectrodes on the performance of dye sensitized solar cells (DSSCs) is presented. DSSCs fabricated with O2 plasma treated and untreated (Reference) photoelectrodes were characterized. It was observed that O2 plasma treatment and the duration of treatment play an important role on dark and illuminated current-voltage (I-V) characteristics,...
This paper presents carrier transport in dye sensitized solar cell (DSSC) using dark current-voltage-temperature (I-V-T) measurements. Dark I-V measurements were performed in 30??C to 85??C range and the dark saturation current of the DSSC was extracted. The measurements revealed that the activation energy of the dark current lies in 1.18-1.27 eV range. This suggests that the charge injection from...
This paper presents low temperature surface passivation using atomic layer deposited aluminium oxide (Al2O3) and hafnium oxide (HfO2) thin films on different silicon substrates. Al2O3 and HfO2 thin films were deposited on p (111) and p (100) Si substrates with different ALD cycles, respectively. Capacitance-voltage (CV) measurement was executed on Al/oxide/Si structures. CV measurements were used...
A periodic asymmetrically loaded photonic-crystal (PC) based polarization converter has been designed and fabricated. The polarization converter structure consists of a single defect line square hole PC slab waveguide with asymmetrically loaded top layer. The design methodology consists of finding the birefringence induced by geometrical asymmetry through full-wave modal analysis. The proposed design...
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