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dc.contributor.advisorBasu, Bikramjit
dc.contributor.authorRanjith Kumar, P
dc.date.accessioned2022-02-28T04:37:48Z
dc.date.available2022-02-28T04:37:48Z
dc.date.submitted2021
dc.identifier.urihttps://etd.iisc.ac.in/handle/2005/5639
dc.description.abstractRenewable power technologies with zero CO2 emissions are the key to regulate the current global warming scenario. Solar energy is the most affordable and sustainable green energy source. One hour of solar radiation has energy equivalent to the world’s annual energy consumption. But due to its low energy density, it requires efficient technology like concentrated solar power (CSP) to harvest and convert to useful energy. Coated with spectrally selective absorber materials, the receiver tubes of the CSP plant play the most pivotal role by converting the incident solar energy to thermal energy. The cost of heat/power generation can be reduced by increasing the photo-thermal conversion efficiency of the CSP plant. This objective can be accomplished by increasing the solar selectivity of the absorbers or increasing the operating temperature of the plant. Therefore, in recent years, significant research is being carried out to develop absorbers that can operate at high temperatures for a longer duration without undergoing degradation. Solar selective absorbers based on carbides, nitrides, borides, and oxides of transition metals, known as ultra-high temperature ceramics, have gained more attention in recent years due to their high thermal and chemical stability, good thermal conductivity, and mechanical properties. This work demonstrates our efforts to develop transition metal boride-based spectrally selective absorber coatings for CSP application. The first part of the work deals with enhancing the solar selectivity and thermal stability of TiB2-based multilayer absorber coating by employing double-layer anti-reflection coating. In the second part of the work, I will present the results obtained with a new NbB2-based multilayer absorber coating. The processing challenges in our attempt to fabricate TiB2 and NbB2-based multilayer absorber coatings with high absorptance in solar irradiation range and low emissivity in the infrared region will be discussed. The developed coatings exhibit good thermal stability at 500°C for 250 hrs in vacuum. Extensive experiments have been carried out to investigate the microstructure and optical properties of the optimised coatings. Based on the obtained results, we have attempted to understand the governing physical phenomena to explain the origin of spectral selectivity and the thermal stability of the developed ceramic coatings.en_US
dc.language.isoen_USen_US
dc.rightsI grant Indian Institute of Science the right to archive and to make available my thesis or dissertation in whole or in part in all forms of media, now hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertationen_US
dc.subjectThin filmsen_US
dc.subjectMagnetron sputteringen_US
dc.subjectSolar selective absorberen_US
dc.subjectConcentrated solar poweren_US
dc.subjectSolar energyen_US
dc.subject.classificationResearch Subject Categories::NATURAL SCIENCES::Chemistry::Other chemistryen_US
dc.titleTransition metal boride based multilayer solar selective coatings for concentrated solar power applicationen_US
dc.typeThesisen_US
dc.degree.namePhDen_US
dc.degree.levelDoctoralen_US
dc.degree.grantorIndian Institute of Scienceen_US
dc.degree.disciplineFaculty of Scienceen_US


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