- Hybrid metal oxide / polymer solar cells
– Prof.P.Ravirajan, Mr.K.Balashangar, Mr.S.Loheswaran, Mr.M.Thanihaichelvan, Mr.K.Prashanthan
|Controlling charge recombination using alumina over layer||
The Alumina coating on TiO2 nano particles in TiO2 / Polymer solar cells serves multiple functions—as physical barrier layers for charge recombination reactions to affect the photo induced charge transfer at the interface, as a means of passivation of TiO2 surface trap states, and to improve the exciton dissociation efficiency at the polymer / TiO2 interface ………
Loheeswaran et al Journal of Nanoelectronics and Optoelectronics 8, 484-488 (2013).
| Improving charge transport using nanorods
Charge recombination in the structures containing vertically aligned ZnO nanorods is remarkably slow, with a half-life of several milliseconds, over 2 orders of magnitude slower than that for randomly oriented ZnO nano-particles. Overall power conversion efficiency of device with nanorods is over four times greater than that for a similar device based on the nanoparticle structure
Ravirajan, P. et al. Journal of Physical Chemistry B 110, 7635-7639, (2006).
- Quantum Dot Sensitised Solar cells (QDSSC)
– Prof.P.Ravirajan, Mr.M.Thanihaichelvan
|Insertion of cadmium sulfide (CdS) QDs at the nanocrystalline TiO2 / P3HT interface improve the efficiency of TiO2/P3HT solar cells by a factor three by broadening the quantum efficiency spectrum and controlling the recombination kinetics …….Thanihai et. al Journal of Material Science: Materials in Electronics 26, 3558-3563, (2015).|
- Nano-pyramid textured silicon solar cells
collaboration with Prof. Maan M. Alkaisi, University of Canterbury, Christchurch, New Zealand.
Texturing the surface of solar cell is one of the techniques widely used for efficient light trapping. We are investigating the impact of sub-wavelength scale texturing ( eg: Nanopyramid, Nanocone, etc) in light trapping for next generation silicon solar cell and thin film solar cells. Influence of quantum dots ( CdSe, Si ) coating for light absorption in nanostrutured solar cells are also being studied.
S. Senthuran et. al, ” Inverted nanopyramid texturing for silicon solar cells using interference lithography”, Journal of Microelectronics Engineering, 119 C, pp. 146-150, (2014)
- Batteries and Fuel Cells
- Concentrated Solar power
Effect of sintering holding time on low-temperature degradation of 3 mol-% yttria stabilised zirconia was investigated. Yttria stabilised zirconia samples were sintered using a two-step sintering cycle. The samples were initially heated to 1500°C with the heating rate of 10°C min−1, held for 1 minute before cooling down to 1200°C and kept at this temperature for varying holding times from 0 to 10 hours. The phase contents of the zirconia samples were measured using X-ray diffractometer, and the microstructural evaluation was evaluated by field emission scanning electron microscope. All the as-sintered samples exhibited 100% tetragonal phase and bulk density of about 6 g cm−3. The low-temperature degradation study was conducted under autoclave condition containing superheated steam at 180°C and 10 bar vapour pressure for periods up to 24 hours. The results showed that the tetragonal to monoclinic phase transformation decreased with increasing holding time up to 3 hours and thereafter it increased. The sample sintered with 3-hour holding time showed better aging resistance than other samples. It was found that the grain size of this sample was the lowest (0·29 μm) when compared to other samples.