What is nanotechnology Nanotechnology is interdisciplinary, involving physics,chemistry,biology, & engineering disciplines. A basic definition: It is the engineering of functional systems at the molecular scale. It is not an atom and reside on surface of atom. Best illustartion of nanotechnolgy is they are motes of matter of 1000 of times smaller than the width of a human hair.
Application of nanoscience Biomedicine And Health Care. Assistive devices and tissue engineering Information Technology. Molecular Electronics. Nanotube and Nanowires. Communication Technology.
Overview of solarcellsSolar cells are photovoltaicdevice.It converts light energyinto electrical energy.Majority of solar cells arefabricated bysemiconductors like siliconor GE.
WORKING OF SOLAR CELLSSolar cells are arranged in largegrouping called arrays.These arrays consist of large no’ssmall individual cells .Cells converts sunlightenergy(PHOTONS) into electricalenergyExamples of semiconductormaterials employed in solar cellsinclude silicon, gallium arsenide,indium phosphide, and copper
• DEMERITS OF SOLAR CELLS Less efficient and high manufacturing cost. Most times incoming photons or light have less band gap energy Because of less band energy electrons doesn‟t knock out. Extra energy is wasted in heat form.
HOW NANO USED IN SOLAR PV CELLS Nano particles are so small they reside on surface of atom. Nanostructured thin films(silicon films) are used in solar cells of 150nm. Thin films offers more Absorption of photons. electrons holes travel short path to reach conduction band.
Nano boosts cells performance Conventional solar cells converts only bluish light of sunlight not red light. Solar cells coated with thin film of silicon of 1 nanometer are most efficient. Thin films boost performance by 60% of UV rays are absorbed. Single wall carbon Nanotubes are most efficeint than nanoparticles alone.
Nanotechnology improve solar cell Nanotechnology use Quantam dots(QD) to increase efficiency of solar cells. Conventionalmaterials in one photon generates just one electron. Quantam Dots have potential to generates multiple electrons. Useof dots increase the electrons to move from Valance band to conduction band very easily.
merits of semiconductor quantam dots Semiconductors and material combinations like Si/Ge or Si/Be Te/Se are considered. Advantage Higher lighter Absorption. Increase the photo current at higher temperatures. Improved radiation hardeness than conventional one.
COST REDUCTION BY NANO Nanotechnology reduces installation cost. Power solar sheets helps to reduces cost of solar cells Cheaper power sheets are made by nanosolar companies. reducing production cost from $3 a watt to 30 cents only. Because of nanotechnology solar power is cheaper than burning coal.
APPLICATION OFNANOTECHNOLOGY USING SOLARCELL Inexpensive solar cells using nanoscience would to help preserve environment. Fossils fuels use would decrease and thus pollution decrease. Cheap solar use for lighting,medical devices and even cooking. improve the standard of living for millions, possibly. even billions of people can help to reduce carbon emissions.
conclusion Nanotechnology films used in solar cells promise to increase . 1} SOLAR ENERGY CONSERVATION. 2} REDUCE MANUFACTURING COST. 3} CAPABLE OF SUPPLYING LOW POWER DEVICES. 4} FUTURE ENERGY SOURCE FOR MANKIND. 5} PRESERVE THE ENVIRONMENT. 6} HELPS TO DEVELOPING COUNTRIES TO PROVIDE ELECTRICITY. 7} AT LAST,NANOTECHNOLOGY IS BOON TO HUMAN SOCIETY.
references Nayfeh, “Thin film silicon nanoparticle UV photodetector” IEEE Photonics Technology, Volume 16, Issue 8, Pages 1927-1929, August 2004. Aldous, Scott. “How Solar Cells Work.” How Stuff Works. M.W. Rowell (June 5, 2006). „Organic solar cells with carbon nanotube network electrodes‟. Greg P. Smestad,” The Basic Economics of Photovoltaics” Optical Society of America 2008.