electrical characteristics of a poly-Si thin film depends on its
- Poly-Si is
more resistive than single- crystal silicon for any given level of
doping mainly because the grain boundaries in poly-Si hamper carrier
dopants for polysilicon include arsenic, phosphorus, and boron.
Polysilicon is usually deposited undoped, with the dopants just
introduced later on after deposition.
- The main
advantage of polysilicon over a-Si is that the mobility can be
orders of magnitude larger and the material also shows greater
stability under electric field and light-induced stress.
allows more complex, high-speed circuity to be created on the glass
substrate along with the a-Si devices, which are still needed for
their low-leakage characteristics. When polysilicon and a-Si devices
are used in the same process this is called hybrid processing.
Polycrystalline (sometimes also called multicrystalline) solar
panels are the most common because they are often the least
expensive. They are the middle choice in the marketplace .Almost as
good as single cell silicon panels but generally with a better
efficiency than thin film solar panels.
speaking, polycrystalline panels have an efficiency that is about
70% to 80% of a comparable monocrystalline solar panel. The most
efficient polycrystalline panels are built by Mitsubishi Electric
Polycrystalline solar panel modules could put solar power into the
hands of people who could not afford the polycrystalline cells.
Consumption in the global market for polycrystalline silicon (polysilicon)
is forecast to reach 444,532 metric tons by the year 2017, spurred
by immense demand from burgeoning photovoltaic industry, the largest
increasing automation and economy of scale, the present generation
of crystalline-silicon solar cells, including single-crystal wafers,
polycrystalline wafers, ribbons, and sheets will continue to
dominate the photovoltaic solar cell market for at least the first
ten years of the 2lst century.
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