Dr. P. Thilakan, Associate Professor, Department of Green Energy Technology, Madanjeet School of Green EnergyTechnologies, Pondicherry University, has been granted two patents by the Government of India for inventions in the domain of research on solar cells and Nano materials.
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| Periyasamy Thilakan being felicitated by Vice Chancellor Gurmeet Singh (Pondicherry University) |
University said the patents are granted under Act 1970 and will have a validity of 20 years.
One of the patented works, ‘Preparation of Luminescent Nanocrystalline Indium-tin-oxide (ITO)’ by Dr. Thilakan and a team of researchers at the Department of Green Energy Technology, deals with the preparation of ITO nanocrystalline active light-emitting layers.
The LED bulb manufacturing utilizes the light emitted from the Gallium Nitride (GaN) that falls into the UV-A bandwidth of emission, which is further converted into white light by phosphors. This white light is reported with a poor color vision called color rendering index (CRI).
The capable emission wavelength of ITO found in the UV-B was around 280-315 nm, potentially improving colored vision. In this patent, the methodology for preparing defect-free ITO Nano crystallites capable of emission at room temperature was invented.
The university said that the application of Nano crystallites for the LED fabrication is expected to emit the white light having more color rendering index.
The other patent, ‘Preparation of wideband TiO2 Antireflection coating for Silicon Solar Cells’ by the team led by Dr. Thilakan, involves the preparation and deposition of TiO2 nanoparticles on the etch-optimized p-type silicon substrates suitable for solar cell fabrication.
A solar cell is a current generator whose capacity is directly proportional to the absorbed number of photons with the energy capacity greater or equal to the bandgap of the semiconductor used. Hence, any loss of photon by reflection is the loss of output.
Till now, the silicon solar cell reported with the highest efficiency of 25.0 ± 0.5% results in the reflection losses of about 16% in the UV illumination.
Using the patented process to optimize the surface of p-Silicon substrate, the preparation and deposition of TiO2 nanocrystalline layers result in flat band antireflection from the UV wavelength to the band edge wavelength of silicon.
This combination of nano TiO2/textured silicon results in the reflection of incident light less than 10% in the UV range, which is less than the reflection of the best silicon solar cell reported so far, the university press note said.
The patents, granted under the Patents Act, 1970, will have a validity of 20 years.
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