Bulk technologies in solar cells, Physics

BULK TECHNOLOGIES: THE bulk technologies are often known as wafer-based manufacturing. In other words in each of these approaches self-supporting wafers between 180 to 240 micrometers thick are processed and then soldered jointly to create a solar cell module. By far the most prevalent bulk material for solar cells is crystalline silicon abbreviated as a group as also known as “solar grade silicon”. Bulk silicon is separated into multiple categories according to crystalline and crystal size in the resulting ingot, or ribbon or wafer.

MONOCRYSTALLINE SILICON: Generally made use of the Czochralski process. Single crystal wafer tends to be expensive. And due to cut from cylindrical ingots, they do not totally cover a square solar cell module without a substantial waste of refined silicon. Therefore most C-Si panels have exposed gaps at the corners of four cells. Singly crystalline wafers can be made into excellent high efficiency solar cells but they are generally considered to be too expensive for large scale mass production.

POLY-OR-MULTI CRYSTALLINE SILICON: poly crystalline silicon wafers are made by wire sawing block cast silicon ingot. Large blocks of molten silicon are carefully cooled and solidified and then taken out in thin (180 to 350 micrometer) slice or wafers .The wafers are use usually lightly p-type doped. To make a solar cell from the wafer, a surface diffusion of n type do pants is on front side of the wafer. This makes a p-n junction a few hundred nanometres beneath the surface. Antireflection coating , which increase the amount of light coupled into the solar cell, are typically applied, next. These cells are less expensive to produce than single crystal cell but are less efficient.

RIBBON SILICON

They are formed by drawing flat thin films from molten silicon and having a multi crystalline structure. These flat wires or metal ribbons are then assembled into modules or solar panels. Solar panel has a sheet of tempered glass on the front and a polymer encapsulation at the back. These cells have lower efficiencies than poly-Si, but save on production costs due to

a great reduction waste , as this approach does not require sawing from ingots.

Posted Date: 7/9/2012 1:46:54 AM | Location : United States







Related Discussions:- Bulk technologies in solar cells, Assignment Help, Ask Question on Bulk technologies in solar cells, Get Answer, Expert's Help, Bulk technologies in solar cells Discussions

Write discussion on Bulk technologies in solar cells
Your posts are moderated
Related Questions
Evaluate the speed will the string break A certain string just breaks when it is under400N of tension. A boy uses this string to whirl a 10-kgstone in a horizontal circle of rad

What is a zone plate? How is it constructed? Show that a zone plate behaves like a convex lens. Deduce the expression for its focal length

KINEMATICS II 1. The concept of the derivative of the function is exceptionally important. The derivative shows that how fast the function changes when its argument is changed.

A certain particle has a lifetime of 1.00 x10 -7 s when measured at rest. How far does it go before decaying if its speed is 0.99c when it is created? The lifetime of particle

Graphs of current against voltage for two resistors P and Q are shown in Figure. Determine the value of every resistor.

Voltage division: In a series circuit Ohm's law applies for each component.  However, since the current is common to all components we have:           V1 = IR1,  V2 = IR2,

How is that circuit wont be broken even there is an air gap in between the parallel plates? Ans) In AC circuit capacitor offers resistance to current as aresistor would do in DC.

how much water at 0degrees is needed to cool 0.5kg of water at 80degrees to 0degrees

Determine the Einstein relations by upward and downward transition. While the system is in equilibrium, the upward and downward transition rates should be equal. N 1 ρ(ν) B

A longitudinal wave with a frequency of 34 Hz takes 1.0 s to travel the length of a 2.5 m Slinky (see the figure). Determine the wavelength of the wave. λ = ( )m