Download
slide1 n.
Skip this Video
Loading SlideShow in 5 Seconds..
silicon nanowire based solar cells PowerPoint Presentation
Download Presentation
silicon nanowire based solar cells

silicon nanowire based solar cells

2157 Views Download Presentation
Download Presentation

silicon nanowire based solar cells

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

    1. Silicon Nanowire based Solar Cells International Congress On Renewable Energy ICORE 2010 2nd December, 2010. Pragya Singh Pratul K Singh

    2. ICORE - 2010, Pragya Singh, Pratul K Singh

    3. Silicon Nanowire based Solar Cells ICORE - 2010, Pragya Singh, Pratul K Singh

    4. ICORE - 2010, Pragya Singh, Pratul K Singh

    5. ICORE - 2010, Pragya Singh, Pratul K Singh

    6. Silicon Nanowire based Solar Cells ICORE - 2010, Pragya Singh, Pratul K Singh

    7. Solar Cell Cell is thin Si wafer Size 10x10 cm : size of a CD Thickness is in fractions of mm Metal pattern is to make electrical contacts. ICORE - 2010, Pragya Singh, Pratul K Singh

    8. Silicon Nanowire based Solar Cells ICORE - 2010, Pragya Singh, Pratul K Singh

    9. Energy Conversion in Solar Cell Light is shone Electrons are knocked out Electrons and holes move in opposite directions Electrical output is generated between the contacts. ICORE - 2010, Pragya Singh, Pratul K Singh

    10. Silicon Nanowire based Solar Cells ICORE - 2010, Pragya Singh, Pratul K Singh

    11. Solar Cells Everywhere Solar cells : Safe Clean Quiet Durable Reliable Installable anywhere ICORE - 2010, Pragya Singh, Pratul K Singh

    12. The Main Catch ICORE - 2010, Pragya Singh, Pratul K Singh

    13. Silicon Nanowire based Solar Cells ICORE - 2010, Pragya Singh, Pratul K Singh

    14. ICORE - 2010, Pragya Singh, Pratul K Singh

    15. Sliced into Nano-scale ICORE - 2010, Pragya Singh, Pratul K Singh

    16. ICORE - 2010, Pragya Singh, Pratul K Singh

    17. ICORE - 2010, Pragya Singh, Pratul K Singh

    18. Silicon Nanowire based Solar Cells ICORE - 2010, Pragya Singh, Pratul K Singh

    19. No Lattice Mismatch. Flexibility to create heterostructures. Broad range of materials. Integration of compound semiconductor based optoelectronic devices with silicon based microelectronics. ICORE - 2010, Pragya Singh, Pratul K Singh Nanowires- Properties

    20. Silicon Nanowire based Solar Cells ICORE - 2010, Pragya Singh, Pratul K Singh

    21. Recombination: Poor efficiency may be due to recombination within the bulk silicon element. Photon strikes the p-n junction in bulk silicon, Produces an electron-hole pair. Electron and hole must travel along the wire to produce current. ICORE - 2010, Pragya Singh, Pratul K Singh Silicon Nanowires- Properties

    22. Recombination: Tendency to recombine with other oppositely charged charge carrier Resulting in heat generation rather than electrical energy ICORE - 2010, Pragya Singh, Pratul K Singh

    23. Reduced Recombination in SiNW: Small diameters. SiNWs grown vertical, perpendicular to the surface of the substrate. Electrons strikes on the surface. Distance of hole/electron travel is minimized. Distance is of the order of nanometers. ICORE - 2010, Pragya Singh, Pratul K Singh

    24. Light Trapping: Light falling on the substrate gets reflected and once again gets absorbed by silicon nanowires. ICORE - 2010, Pragya Singh, Pratul K Singh

    25. Increased Surface Area: Very narrow pointed structures. Diameter in nanometers. Length in micrometers. Greater area made of p-n junctions is exposed to sunlight. Increases absorptivity. ICORE - 2010, Pragya Singh, Pratul K Singh

    26. ICORE - 2010, Pragya Singh, Pratul K Singh Silicon Nanowires- Properties

    27. Tiny PV Cells: Composed of 3 layers: Inner P region Intrinsic or pure silicon Outer N region ICORE - 2010, Pragya Singh, Pratul K Singh

    28. Photon strikes the outer shell Electron-hole pair is created Travels in the radial direction towards the P layer (core) before recombination. ICORE - 2010, Pragya Singh, Pratul K Singh

    29. Silicon Nanowire based Solar Cells ICORE - 2010, Pragya Singh, Pratul K Singh

    30. Fabrication Catalyst Particles : The catalyst must be inert to the reaction products (during CVD nanowire growth). Gold Aluminum Tin Indium Gallium ICORE - 2010, Pragya Singh, Pratul K Singh

    31. Silicon Nanowire based Solar Cells ICORE - 2010, Pragya Singh, Pratul K Singh

    32. Techniques for SiNW Deposition Techniques: Supercritical-Fluid-Based and Solution-Based Growth Techniques Molecular Beam Epitaxy Laser Ablation Silicon Monoxide Evaporation PECVD ICORE - 2010, Pragya Singh, Pratul K Singh

    33. Silicon Nanowire based Solar Cells ICORE - 2010, Pragya Singh, Pratul K Singh

    34. Experiment at the SSN Research Centre ICORE - 2010, Pragya Singh, Pratul K Singh

    35. Si-NW Growth Principle ICORE - 2010, Pragya Singh, Pratul K Singh

    36. Si-NW Deposition Process Steps ICORE - 2010, Pragya Singh, Pratul K Singh Silicon (4 inch) n-type Substrate Cleaned Chromium layer of 10.7nm deposited by EBE Method Gold Layer of 2.6nm deposited by EBE Method

    37. SiNW Deposition Experiment Catalyst Nano Particles: Gold Film Layer (2.6nm) Deposited on Silicon Substrate by EBE Heated at 580 degrees to form Nano Particles Figure1 SEM image of Nano particles of Gold ICORE - 2010, Pragya Singh, Pratul K Singh

    38. SiNW Deposition Experiment PECVD system. Temperature : 380 degrees Pressure in mTorr : 500mT Time of Deposition : 30 minutes Gases Used : Silane, Hydrogen and Argon ICORE - 2010, Pragya Singh, Pratul K Singh

    39. Si NW Comparison ICORE - 2010, Pragya Singh, Pratul K Singh

    40. Thank You ICORE - 2010, Pragya Singh, Pratul K Singh