This document discusses using nanowires to improve the efficiency of solar cells. Current solar cell technology faces problems with efficiency around 10-14% for silicon wafer cells. Nanowires can increase the surface area for light absorption and have great potential to enhance efficiency. A "solar tree" design is proposed that would use panels like leaves on a tower structure to generate renewable energy from the sun similar to how trees produce food through photosynthesis. The solar tree could power street lights, homes, industries, and save land while raising public support for renewable energy resources.

1. SOALR TREE USING NANOWIRE
SOALR CELLS

2. Now a days with the growing population and
energy demand will increases we have the present
energy resources are fossil fuels such as coal,
oil, natural gases,wood. but even this stock may
not longer than a few decades
So what is our future energy sources..those are
Renewable energy Resources
INTRODUCTION

3. Renewable energy
Resources
solar pv wind
GeothermalTidal Power hydro power

4. solar cell (photovoltaic cell)
convert light into a small electrical output -milliwatts output.Si wafer
Cell is thin Si wafer
Thickness is in fractions of mm
need a bank/array of cells for useful output.
cost of cells is high but reducing.
efficiency of cells is up to 10-14%/ improving

5. Problems faced with
current solar cell
technology
soooo......
• Different kinds of solar cells
Monocrystalline: made of
single crystalline silicon of high
purity.
Efficiency :15-17
Polycrystalline:, made
up polycrystalline
silicon
Effcicency : 13-15
Thin film: Made of
several thin layers of
semiconductor
material.
Effciency : 12-15
Figure A
Figure B
Figure C

6. Sliced into Nano-scale
 Diameters from 1 to 50nm
 Nano scale Silicon has a color difference
 Quantum Confinement
 Nano sized Silicon shows:
 Physical
 Optical
 Electronics properties change
 Electrons occupy different energy levels

7. NANOWIRES TO THE RESCUE
• Use Nanowires!
• Very small, increases surface area for light
absorption
• Great potential
• Nanowires in solar cells
• Increased efficiency

8. WHAT IS SOLAR TREE
TREE stands for
T=TREE GENERATIING
R=RENEWABLE
E=ENERGY and
E=ELECTRICITY
This is like a tree in a structure and the panels are like leaves of the tree which produces
Energy.

9. COMPONENTS OF SOLAR TREE
The solar tree consists of manly five parts to design.
 Solar Panel.
 Long tower.
 LEDs.
 Batteries.
 Stems.

10. WHY WE CALL IT AS SOLAR TREE
 Tree can produce their own food material for human beings by the process
called PHOTOSYNTHESIS.
 Likewise in solar tree solar plates are producing energy for the society.

11. WHY IT IS BETTER THAN TRADITIONAL
SYSTEMS

12. APPLICATIONS
 Street Light.
 House Supply.
 Industrial Power Supply.

13. ADVANTAGES
 No air pollution.
 We wouldn’t have to worry as much about future energy sources.
 low maintenance
 Land requirement is very less.

14. DISADVANTAGES
 Costly.
 Hazards to eyesight form solar reflectors.

15. CONCLUSION
 Saving of land, this project is very successful one.
 Incresses the effciency of solar cell using nanowires
 The main aim of this project is upliftting the public
opinion on R E S