Solar tree using nanowire

1. SOLAR TREE USING NANOWIRE SOLAR CELLS
1 Introduction
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
Solar technology that emulates how trees convert sunlight into energy. Trees, shrubs and
plants use an inherent structural design to expose their leaves, height dense to sunlight for
photosynthesis. They do this determines their survival. Based on this we describe the coconut tree
growing u to 30m(98 feet) tall, with pinnate leaves 4-6m(13- 20feet) long to design a solar tree.
Pinnate refers to a leaf resembling like a feather having the leaflets on each side of a common axis. It
can be either even or odd. By this structured pattern that leaves follow to arrange themselves on a
tree. With this arrangement we introduce a new idea to design a solar tree using nanowire solar cell.
Nanoparticles exhibit a number of special properties relative to bulk material.
A single Nanowire concentrates the sunlight up to 15 times of the normal sunlight
intensity. Surprising results have the potential for developing a new kind of highly efficient solar cell.
Nanowires possess some distinctive physical light absorption properties. Because of these properties,
the limit of how much energy from the sun’s rays we can use is higher than previously thought. For
many years it has been a high mark for solar cells efficiency among researchers, but now there is
possibility that it may be raised higher. Hence it is a revolutionary urban lighting concept that not just
trees but other objects can also be decorated. These technologies eventually lead to the development
of high efficiency solar cells that50% of the worldpowerrequirementsinthe middle of 21stcenturywill only
come from solarenergy.

2. 2 Renewable energy Resources
Renewable energy is sustainable as it is obtained from sources that are inexhaustible (unlike fossil
fuels). Renewable energy sources include wind, solar, biomass, geothermal and hydro, all of which
occur naturally. Renewable energy, generally speaking, is clean energy and non-polluting.
solar pv Wind
GeothermalTidal Power Hydro power

3. 3 Solar cell (photovoltaiccell)
 convert light into a small electrical output -mill watts 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
4 Different kinds of solar cells
Monocrystalline: made of single crystalline silicon
of high purity.
Efficiency: 15-17

4. 5 Sliced into Nano-scale
 Diameters from 1 to 50nm
 Nano scale Silicon has a color difference
 Quantum Confinement
 Nano sized Silicon shows:
Polycrystalline: made up
polycrystalline silicon
Efficiency: 13-15
Thin film: Made of several thin
layers of semiconductor
material.
Efficiency: 12-15

5.  Physical
 Optical
 Electronics properties change
 Electrons occupy different energy levels
Nanowires To The Recuse
• Nanowires in solar cells
• Use Nanowires!
• Very small, increases
surface area for light
absorption
• Great potential
• Increased efficiency

6. 6 Solar Tree
It is a combination of artistic and technological effort which exists as a form of solar artwork. This
relatively new concept was conceived in an attempt to merge new technology relating to the
absorption and use of solar power. Since the angle of sun’s rays is not fixed, particularly during the
changes in seasons, the panels for homes are inefficient. Some residential solar systems are designed
to move and track the sun but these systems substantially increase the cost of solar energy because
they are expensive and require maintenance. So we designed a solar tree using an array of solar panels
of nanowire solar cells as leaves.
The solar cells on the tree were able to store enough electricity in spite of receiving no direct solar light
for days at a time because of the clouds. Solar trees were really a practical form of street lightning. We
planned to design green stems constructed of steel pipes supporting a light bubble in which solar cells
are connected. In place of branches we use solar panel which has to produce voltage. The design

7. copied from the pattern of coconut tree as closely as possible. Battery is hidden at the ground base
which is closed with proper material. The branch of the solar tree was decorated with LED lights at the
tip.
7 Light Bubble
Alight bubble is a decorative device consisting of a liquid filled vial that is heated and lighted by an
incandescent light bulb. Because of the low liquid’s boiling point the modest heat generated by the
lamp causes the liquid to boil and bubble up from the vial’s base thus creating the bubble light.
8 Components of Solar Tree
 Solar Panel.
 Long tower.
 LEDs.
 Batteries.
 Stems.

8. 9 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.
10 Applications
 Street Light.
 House Supply.
 Industrial Power Supply
11 Advantages
 No air pollution.
 We wouldn’t have to worry as much about future energy sources.
 low maintenance
 Land requirement is very less.

9. 12 Disadvantages
 Costly.
 Hazards to eyesight form solar reflectors.
13 Solar Energy
Solar energy is radiant light and heat from the Sun that is harnessed using a range of ever-evolving
technologies such as solar heating, photovoltaics, solar thermal energy, solar architecture, molten salt
power plants and artificial photosynthesis.
It is an important source of renewable energy and its technologies are broadly characterized as
either passive solar or active solar depending on how they capture and distribute solar energy or
convert it into solar power. Active solar techniques include the use of photovoltaic
systems, concentrated solar power and solar water heating to harness the energy. Passive solar
techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or
light-dispersing properties, and designing spaces that naturally circulate air.
The large magnitude of solar energy available makes it a highly appealing source of electricity.
The United Nations Development Programme in its 2000 World Energy Assessment found that the
annual potential of solar energy was 1,575–49,837 exajoules (EJ). This is several times larger than the
total world energy consumption, which was 559.8 EJ in 2012.
In 2011, the International Energy Agency said that "the development of affordable, inexhaustible and
clean solar energy technologies will have huge longer-term benefits. It will increase countries’ energy
security through reliance on an indigenous, inexhaustible and mostly import-independent resource,
enhance sustainability, reduce pollution, lower the costs of mitigating global warming, and keep fossil
fuel prices lower than otherwise. These advantages are global. Hence the additional costs of the

10. incentives for early deployment should be considered learning investments; they must be wisely spent
and need to be widely shared.
14 Conclusion
The solar new technology presented in this paper will provides nearly high efficiency. The number of
papers and patents published in this area has grown up exponentially over the last 10 years. However
at the present, research efforts have largely focused on solar trees. Nanowire can concentrate the
sunlight up to 15 times of the normal sunlight intensity and hence the surprising results have the
potential for developing a new kind of highly efficient solar cell. This can be used to give a higher
concentration efficiency of the sun’s energy.

11. Index
1 Introduction………………………………………………………………………...…01
2 Renewable energyResources………………………………………………………...02
3 Solarcell (photovoltaic cell)………………………………………………………….03
4 Different kinds of solarcells…………………………………………………………03
5 Slicedinto Nano-scale………………………………………………………………...04
6 SolarTrees…………………………………………………………………………….06
7 Light Bubbles…………………………………………………………………………07
8 Components of SolarTree……………………………………………………………07
9 Why We Call It as SolarTree………………………………………………………..08
10 Applications………………………………………………………………………….08
11 Advantages…………………………………………………………………………..08
12 Disadvantages………………………………………………………………………..09
13 Solar Energy…………………………………………………………………………09
14 Conclusions…………………………………………………………………………..10