Triple junction based high efficiency tandem solar cells

Triple Junction based High Efficiency Tandem Solar Cells

Submitted by:

Pritam Rath

Regd No: 0911013206

Electrical Engineering

Guided By:Mr. Manas Ranjan NayakAssistant ProfessorDepartment of Electrical EngineeringITER, BHUBANESWAR

The output of sun is

2.8×1023KWH/year. The energy reaching the earth is 1.5×1018KWH/year.

Solar energy technologies include solar heating, solar photovoltaics, Solar air conditioning, Solar lamp, Space-based solar power.

SOLAR ENERGY- AN OVERVIEW

The use of solar energy has not been opened

up because the oil industry does not own

the sun.Ralph Nader

P N P N

Solar Power is converted to electricity using PV (Photovoltaic) effect.

HOW TO HARNESS SOLAR POWER

Solar Power is concentrated and converted to thermal energy which is converted to electric energy.

Triple Junction based High

Efficiency Tandem Solar Cells

In 1839, Edmond Becquerel found that two different brass plates immersed in a liquid produced a continuous current when illuminated with sunlight. We now believe that he had made a copper - cuprous oxide thin - film solar cell. Later in the 1870s, Willoughby Smith, W. G. Adams, and R. E. Day discovered a PV effect in selenium.

A solar cell is a semi-conducting device made of silicon or other materials, which, when exposed to sunlight, generates electricity. It uses the Photovoltaic technology.

A SOLAR CELL

A SOLAR CELL

A SOLAR CELL

Mono-Crystalline silicon cells

Poly Crystalline Solar Cells

Thin Film Solar Cells

Multi-junction

Solar Cells

TYPES OF SOLAR CELL

Triple Junction based High

Efficiency Tandem Solar Cells

TRIPLE JUNCTION TANDEM CELLS

TRIPLE JUNCTION TANDEM CELLS

Si

Si

Si

Si

Si

Valence Band

Forbidden Band Gap

Ev

Ec

SILICON STRUCTURE

EnergyConduction Band

TRIPLE JUNCTION TANDEM CELLS

As33

In49

Ga31

Electron without bonding

GaInAs STRUCTURE

TRIPLE JUNCTION TANDEM CELLS

Conduction Band

Valence Band

Forbidden Band Gap

Ev

Ec

Energy

Valence BandEv

EcEfEnergy

BandGap

SILICON GaInAs

Conduction Band

Triple Junction based High

Efficiency Tandem Solar Cells

EFFICIENCY ANALYSIS

The efficiency in recent years have been 60% in satellites and nearly 85% in laboratory for 30cm2 cell at 200 suns.

As compared to its counter parts such as other silicon solar cells having efficiency nearly 20%.

The most important factor is the end-of-life (EOL) efficiency.

EFFICIENCY ANALYSIS

EFFICIENCY ANALYSIS

Presently this kind of Solar cell technology is only restricted to space applications.

All the Satellites use this kind of Solar Cells.The main hindrance in the commercialization of this

kind of solar cell is the cost.Cost of these solar cells is $2.48/cm2. Lots of research work is going on to reduce the

price.

PRESENT AND FUTURE

T. Takamoto, K. Sasaki et al., Proceedings of the 35th IEEE Photovoltaic Specialists Conference, Hawaii, USA, June 2010.

Research and Development Trends of Solar Cell for Highly Efficiency daisuke kanama, hiroshi kawamoto Nanotechnology and Materials Research Unit, quarterly review no.28/july 2008.

Martin A. Green, Keith Emery, Yoshihiro Hishikawa and Wilhelm Warta, “Solar cell efficiency tables”, Published online 18 June 2010 in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/pip.1021.

REFERENCES

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