What is III-V solar cell
Today, solar cell can be roughly classified into three
generations (the fourth generation is not yet in mass production
stage).
The first
generation is the silicon-based technology, which can be roughly
classified into single crystaline and poly crystaline. It has
a
long history of commercial application and has been widely applied for
family and comsumption merchandises; the second generation is the
thin-film technology in which a big part is made of amorphous or II-VI
compound material. Thin-film technology is often employed in
BIPV(Build-In Photovoltaic) material; The third generation is GaAs
III-V solar cell. GaAs has long been used to generate
electricity
in space as GaAs has some electronic and material properties which are
superior to those of silicon. Further more, GaAs has direct band gap
which allows it to absorb the energy from sun light photons more
efficiently. III-V material was too expensive to be used for
terristrial and family consumption purposes. Nowadays, with the
increasing knowledge of semi-conductor material along with
the
application of concentrating optical devices, now the terristrail use
of III-V solar cell is no longer a far-fetched dream. Today the
conversion efficiency of three-junction III-V solar cell can be up to
40.7% and its manufacuring expense has also been largely reduced. The
high efficiency GaAs solar cell will be the next star product of
photovoltaic material.
What is a triple-junction solar cell
Triple junction solar cell is solar cell with three P/N
junctions. The three materials consisting the three junctions( commonly
seen as InGap, GaAs and Ge) has different band gaps to absorb the full
sunlight spectrum. III-V multi-junction solar cells therefore have a
much higher conversion efficiency compared to silicon cells.
Is there any international standards for HCPV
The most trust-worthy international standards for testing
and
evaluating solar cells are IEC62108 and IEC60904. For the quality of
module, receiver and system, IEEE 1513 is the most frequently adopted
one. Solapoint is now in progress of passing all the IEC 62108
standards.
How to calculate concentration ratio
Geometric concentration ratio = lens size / chip size
Isc concentration ration= concentrated Isc/ 1 sun Isc
Isc concentration ration= concentrated Isc/ 1 sun Isc