PHOTO VOLTAIC GENERATORS
As name indicates

PHOTO = light

VOLTAIC = volts
 PHOTVOLTAICS IS A METHOD of generating
elec...
WHAT IS PHOTO VOLTAIC EFFECT?


Photovoltaic effect is the basis of photo voltaic
power generation.



The photovoltaic ...
PHOTO VOLTAIC GENERATION
WHAT IS PHOTO VOLTAIC EFFECT?
•

When the sunlight or any other light is
incident upon a material surface, the
electrons p...
FABRICATION OF SOLAR/PHOTOVOLTAIC CELL
 In

1883, first photo voltaic cell was made by
Charles Fritts, who coated
the sem...
FABRICATION OF
SOLAR/PHOTOVOLTAIC CELL

Basically
A solar cell is a junction (usually a PN junction) with sunlight shining...
FABRICATION OF SOLAR CELLS


The first practical photovoltaic cell was developed
in 1954 at Bell Laboratories .They used ...
STEPS OF FABRICATION
First step is refining silicon
 Silicon dioxide (SiO2) is the most abundant mineral
in the earth's c...
STEPS OF FABRICATION
oSilicon di oxide + Carbon = Silicon + Carbon di oxide
oThe resulting silicon is 98% pure. It contain...
STEPS OF FABRICATION
•During this reaction impurities such as Fe, Al, and B react
to form their halides (e.g. FeCl3, AlCl3...
STEPS OF FABRICATION
Above reaction takes place inside large vacuum
chambers and the silicon is deposited onto thin
polysi...
STEPS OF FABRICATION


AFTER GETTING THE REQUIRED SILICON
FROM ABOVE MENTIONED CHEMICAL
PROCEDURE , different methods of ...
METHODS OF FABRICATION
1) SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
 Screen-printed solar cells were first develop...
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
1) SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
SCREEN PRINTED SOLAR CELL
FABRICATION TECHNOLOGY
BURIED CONTACT FABRICATION TECHNOLOGY
BURIED CONTACT FABRICATION TECHNOLOGY


The buried contact solar cell is a high efficiency
commercial solar cell technolo...
RECENT FABRICATION RESEARCHES


To further increase efficiencies of solar cells , it is
found useful to modify the struct...
RECENT IMPROVEMENTS
USE OF SOLAR CELLS FOR SPACE VEHICLES
Invention of solar cells for practical scales and their
implementation for power gen...
USE OF SOLAR CELLS IN SPACE FOR EARTH


The solar energy available in space is literally
billions of times greater than w...
USE OF SOLAR CELLS IN SPACE FOR EARTH
Upcoming SlideShare
Loading in...5
×

SOLAR CELL FABRICATION,SOLAR CELLS,

7,846

Published on

SOLAR CELLS FABRICATION, SOLAR ENERGY ,

Published in: Education, Technology, Business
0 Comments
6 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
7,846
On Slideshare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
665
Comments
0
Likes
6
Embeds 0
No embeds

No notes for slide

SOLAR CELL FABRICATION,SOLAR CELLS,

  1. 1. PHOTO VOLTAIC GENERATORS As name indicates  PHOTO = light  VOLTAIC = volts  PHOTVOLTAICS IS A METHOD of generating electrical power by converting solar radiation into direct current electricity using semiconductors that exhibit the Photovoltaic effect. 
  2. 2. WHAT IS PHOTO VOLTAIC EFFECT?  Photovoltaic effect is the basis of photo voltaic power generation.  The photovoltaic effect is the creation of voltage or electric current in a material upon exposure to light.
  3. 3. PHOTO VOLTAIC GENERATION
  4. 4. WHAT IS PHOTO VOLTAIC EFFECT? • When the sunlight or any other light is incident upon a material surface, the electrons present in the valence band absorb energy and, being excited, jump to the conduction band and become free. These highly excited electrons jump into a different material (electrodes). This generates an electromotive force, and thus some of the light energy is converted into electric energy which means energy is generated in this way.
  5. 5. FABRICATION OF SOLAR/PHOTOVOLTAIC CELL  In 1883, first photo voltaic cell was made by Charles Fritts, who coated the semiconductor selenium with an extremely thin layer of gold to form the junctions.  It was only 1% efficient.  To understand the fabrication of solar cells we need to understand some basics,……….
  6. 6. FABRICATION OF SOLAR/PHOTOVOLTAIC CELL Basically A solar cell is a junction (usually a PN junction) with sunlight shining on it.
  7. 7. FABRICATION OF SOLAR CELLS  The first practical photovoltaic cell was developed in 1954 at Bell Laboratories .They used a diffused silicon p–n junction that reached 6% efficiency, compared to the selenium cells.  Most practical solar cells are silicon based , because it is cheap and abundant material.
  8. 8. STEPS OF FABRICATION First step is refining silicon  Silicon dioxide (SiO2) is the most abundant mineral in the earth's crust.  The manufacture of the hyper pure silicon for photovoltaics starts with locating a source of silicon dioxide in the form of sand.  The silica is reduced (oxygen removed) through a reaction with carbon in the form of coal, charcoal and heating to 1500-2000 °C in an electrode arc furnace. 
  9. 9. STEPS OF FABRICATION oSilicon di oxide + Carbon = Silicon + Carbon di oxide oThe resulting silicon is 98% pure. It contains Fe, Al, and B , to remove these traces , further purification is done , Powdered Si is reacted with anhydrous HCl at 300 C to form SiHCl3
  10. 10. STEPS OF FABRICATION •During this reaction impurities such as Fe, Al, and B react to form their halides (e.g. FeCl3, AlCl3, and BCl3). •The SiHCl3 has a low boiling point of 31.8 C and distillation is used to purify the SiHCl3 from the impurity halides. •Finally, the pure SiHCl3 is reacted with hydrogen at 1100 C for ~200 – 300 hours to produce a very pure form of silicon.
  11. 11. STEPS OF FABRICATION Above reaction takes place inside large vacuum chambers and the silicon is deposited onto thin polysilicon rods (small grain size silicon) to produce high-purity polysilicon rods of diameter 150-200mm.  Silicon used for solar cells can be single crystalline, multi crystalline, polycrystalline or amorphous. The key difference between these materials is degree to which the semiconductor has a regular, perfectly ordered crystal structure. 
  12. 12. STEPS OF FABRICATION  AFTER GETTING THE REQUIRED SILICON FROM ABOVE MENTIONED CHEMICAL PROCEDURE , different methods of solar cells fabrication are applied , each method involves doping of silicon to make p-n junction , and required processes to make a furnished solar cell.
  13. 13. METHODS OF FABRICATION 1) SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY  Screen-printed solar cells were first developed in the 1970's. Most mature solar cell fabrication technology. The key advantage of screen-printing is the relative simplicity of the process.  It involves cutting a wafer of 10*10 square cm ,0.5mm thick , this wafer is then p-type doped with born to add up holes . 
  14. 14. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  15. 15. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  16. 16. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  17. 17. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  18. 18. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  19. 19. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  20. 20. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  21. 21. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  22. 22. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  23. 23. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  24. 24. 1) SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  25. 25. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  26. 26. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  27. 27. SCREEN PRINTED SOLAR CELL FABRICATION TECHNOLOGY
  28. 28. BURIED CONTACT FABRICATION TECHNOLOGY
  29. 29. BURIED CONTACT FABRICATION TECHNOLOGY  The buried contact solar cell is a high efficiency commercial solar cell technology based on a plated metal contact inside a laser-formed groove. Buried contact solar cell to have performance up to 25% better than commercial screen-printed solar cells.  Shading losses are 2 to 3%.  without having a wide strip of metal on the top surface as in last case, and a large metal height-towidth aspect ratio increases the efficiency of cell. 
  30. 30. RECENT FABRICATION RESEARCHES  To further increase efficiencies of solar cells , it is found useful to modify the structures of solar cells to maximize the life of cells as well as to increase their power rating .  Some new structures are shown next……
  31. 31. RECENT IMPROVEMENTS
  32. 32. USE OF SOLAR CELLS FOR SPACE VEHICLES Invention of solar cells for practical scales and their implementation for power generation in space vehicles has modified and eased the space research work.  Solar panels are shaped and fixed on the body of space vehicle .  Sine sun rays need no any medium to flow , these rays are available in space and are utilized by solar cells for power requirements of space vehicles.  So in space vehicles , D.C batteries are only used for power storage , and they are not the only source of power generation , as solar cells are installed 
  33. 33. USE OF SOLAR CELLS IN SPACE FOR EARTH  The solar energy available in space is literally billions of times greater than we use today. Americans are working on to gathers energy from sunlight in space and transmits it wirelessly to Earth i.e. SPACED BASED SOLAR POWER PROJECT  Space solar power is by far the largest potential energy source available.  A lot of work is to be done in this context. 
  34. 34. USE OF SOLAR CELLS IN SPACE FOR EARTH
  1. ¿Le ha llamado la atención una diapositiva en particular?

    Recortar diapositivas es una manera útil de recopilar información importante para consultarla más tarde.

×