BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Asia/Calcutta BEGIN:STANDARD DTSTART:19451014T230000 TZOFFSETFROM:+0630 TZOFFSETTO:+0530 TZNAME:IST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20121204T075543Z UID:2FD29318-8F38-1030-AD29-0050568D3657 DTSTART;TZID=Asia/Calcutta:20121212T153000 DTEND;TZID=Asia/Calcutta:20121212T163000 DESCRIPTION:Speaker: Prof. Devki N. Talwar Professor & Chair\, Department o f Physics \, Indiana University of Pennsylvania\, Indiana Abstract of the Talk: The biggest cause of global warming on earth is the release of carbo n dioxide when fossil fuels such as oil\, natural gas and coal are burned to produce energy. The main function of carbon dioxide present in the atmo sphere is to trap heat obtained from sunlight and do not let it go beyond the atmosphere. When there is a rise in the percentage of carbon dioxide i n air\, the amount of heat captured by carbon dioxide also increases contr ibuting towards overall rise in the surface temperature of the earth or gl obal warming. Solar energy i.e.\, power from the sun is a vast and inexhau stible resource. Given the abundance of solar energy\, this resource is po ised to play a prominent role in our energy needs. If highly efficient sol ar cell is designed produced and put in place to convert “solar ener gy” into useful energy - the fossil fuel will be freed up and never cause turmoil in the World economy. Clearly\, solar-energy represents a cl ean alternative to the fossil fuels which are polluting our air\, water\, threaten our public health\, and contribute to global warming. The convent ional solar cells made by amorphous silicon (a-Si) are by far the least ex pensive but result in low efficiency. Number of expensive materials such a s gallium arsenide (GaAs)\, copper-indium-diselenide (CuInSe2)\, cadmium-t elluride (CdTe) and gallium indium nitrides (GaInN) are used to make solar cells with higher efficiencies. These new materials exhibit interesting p roperties\, including the ability to manufacture solar cells which are sen sitive to different parts of the light spectrum. Recent progress in nanote chnology has however opened the door to the production of much cheaper (pl astic-based) and more efficient solar cells. The purpose of this talk is t o present an overview of solar cells\, in general\, and the novel solar-ce lls\, in particular\, which utilize tiny nano-particles (quantum dots and nanorods) dispersed within a polymer. These nano-particles when absorb lig ht of a specific wavelength they generate electrons. These electrons flow through the nano-particles until they reach the aluminum electrode where t hey are combined to produce a current. This type of cell is cheaper to man ufacture than the conventional ones for two main reasons: (i) the plastic cells are not made from silicon (ii) manufacturing of these cells does not require expensive equipment such as clean rooms or vacuum chambers like c onventional silicon based solar cells.\n\nCo-sponsored by: Dr. Rajesh Gupt a\n\nBldg: Seminar Hall\, Electrical Engineering Department\, MNNIT Allaha bad\, Allahabad\, Uttar Pradesh\, India\, 211004 LOCATION:Bldg: Seminar Hall\, Electrical Engineering Department\, MNNIT All ahabad\, Allahabad\, Uttar Pradesh\, India\, 211004 ORGANIZER:rajgupta310@gmail.com SEQUENCE:0 SUMMARY:Nanotechnology: Making Efficient Solar Cells for Clean Energy URL;VALUE=URI:https://events.vtools.ieee.org/m/15617 X-ALT-DESC:Description: <br />Speaker: Prof. Devki N. Talwar\nProfessor & C hair\, Department of Physics \, Indiana University of\nPennsylvania\, Indi ana\n\n\nAbstract of the Talk:\n\nThe biggest cause of global warming on earth is the release of\ncarbon dioxide when fossil fuels such as oil\, natural gas and coal are\nburned to produce energy. The main func tion of carbon dioxide present in\nthe atmosphere is to trap heat obtained from sunlight and do not let it go\nbeyond the atmosphere. When there is a rise in the percentage of carbon\ndioxide in air\, the amount of h eat captured by carbon dioxide\nalso increases contributing towards overall rise in the surface\ntemperature of the earth or global warming. S olar energy i.e.\, power from\nthe sun is a vast and inexhaustible resourc e. Given the abundance of solar\nenergy\, this resource is poised to play a prominent role in our\n energy needs. If highly efficient solar cell is designed produced and\nput in place to convert “solar energy” into useful energy - the fossil\n fuel will be freed up and never cause turmoil in the World\neconomy. Clearly\, sola r-energy represents a clean alternative to\nthe fossil fuels which are polluting our air\, water\, threaten our\npublic health\, and contri bute to global warming. The conventional solar\ncells made by amorphous si licon (a-Si) are by far the least expensive but\nresult in low efficien cy. Number of expensive materials such as\ngallium arsenide (GaAs) \, copper-indium-diselenide (CuInSe2)\,\ncadmium-telluride (CdTe) and gallium indium nitrides (GaInN) are used\nto make solar cells with higher efficiencies. These new materials exhibit\n interesting properties\, i ncluding the ability to manufacture solar\n cells which are sensiti ve to different parts of the light\nspectrum. Recent progress in nanotechnology has however opened the\ndoor to the production of much cheaper (plastic-based) and more\nefficient solar cells. The purpose of this talk is to present\nan overview of solar cells\, in general\, and the novel solar-cells\, in\nparticular\, which utilize tiny nano-particles (quantum dots and nanorods)\ndispersed within a polyme r. These nano-particles when absorb light of a\nspecific wavelength they generate electrons. These electrons flow\nthrough the nano-particl es until they reach the aluminum electrode\n where they are combi ned to produce a current. This type of cell is\ncheaper to manufacture than the conventional ones for two main reasons:\n(i) the plastic cells ar e not made from silicon (ii) manufacturing of\nthese cells does not requi re expensive equipment such as clean\nrooms or vacuum chambers li ke conventional silicon based solar cells. END:VEVENT END:VCALENDAR