Thin film technologies in solar cells, Physics


The various thin technologies currently being developed reduce the amount of light absorbing material required in creating a solar cell. This can lead to reduced processing costs from that of bulk materials (in the case of silicon thin films) but also tends to reduce energy conservation efficiency, although many multilayer thin films have efficiencies above those of bulk silicon wafers. Another interesting aspect of thin film solar cells is the possibility to deposit the cells of all kinds of materials, including, flexible substrates which opens a new dimensions for new applications. Some of the materials for thin film are.

Cadmium Telluride: cadmium telluride is an effective light absorbing material for thin film solar cells. Compared to other thin film materials, cadmium telluride is easier to deposit and more suitable for large scale production. Despite the toxicity of cadmium telluride based solar cells, this is the only technology (apart from amorphous silicon) that can be delivered on large scale.

CIGS: CIGS are multilayered thin film composites. The abbreviation stands for copper indium gallium serenade. Unlike the basic silicon solar cell which can be modelled as simple p-n junction these cell are best described by a more complex hetero junction model. Higher efficiency can be obtained by using optics to concentrate the incident light. The use of indium increase the band gap of the CIGS layer, gallium is added to replace as much indium as possible due the relative more availability of gallium as compared to indium. Selenium permits for enhanced uniformity across the layer and so the number of recombination sites in the film are reduced which benefits the quantum efficiency and therefore the conversion efficiency.

CIS: CIS is an abbreviation for general chalcogenide films of copper indium solenoid. While these films can achieve 11/ efficiency; their manufacturing cost are high at present but continuing works is leading to more cost effective production processes.

GALLIUM ARSENIDE MULTIJUNCTION: HIGH EFFICIENCY cells have developed for special applications such as satellites and space exploration which require high performance. These multifunction cells consists of multiple thin films produced using molecular beam epitaxial. A triple junction cell consists of the semiconductors: gallium arsenide. Each type of semiconductor will have a charactistics band gap energy which causes it to absorb light most efficiently at a certain colour, or more precisely, to absorb electromagnetic radiations over a portion of the spectrum. The semiconductor is carefully chosen to absorb nearly all the solar spectrum, this generating electricity from as much of the solar energy as possible. Gallium arsenide multi junction devices are the most efficient solar cells to data, reaching as high as 39% efficiency.         


Posted Date: 7/9/2012 2:11:09 AM | Location : United States

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

Write discussion on Thin film technologies in solar cells
Your posts are moderated
Related Questions
Q. In the given circuit, calculate the current through the circuit and mention its direction . Let the current be I. 5I + 10 I + 5 I = 10 + 20 that is 20 I = 30 Current I =

A 10.0-kg object is held up by a string that will break when the tension exceeds 1.00 x 10 2 N. At what upward acceleration will the string break?

in which machines mechanicle adva ntage is greater than one?????

Factors which are affect velocity of sound in gaseous medium is (1) Effect of density (2) Effect of pressure (3) Effect of temperature :      (4) Effect of humidity

define the coefficient of friction

A lever of the first class Saw off a stick or board so that it is the similar height as a heavy desk or table in the classroom. Place another stick about the similar length on

A steam bath An evaporating dish and steam bath can be contrived from a saucer and a tin. Scallops are cut out of the top of the tin to permit the steam to escape

Three inductive loads, each of resistance 4Ω and reactance 9Ω are linked in delta. When linked to a 3-phase supply the loads consume 1.2kW. Calculate (a) The power factor of

A parallel plate capacitor, each with plate area A and separation d, is charged to a potential dissimilarity V. The battery used to charge it is then disconnected. A dielectric sla

Helium gas with a volume of 2.60 L, under a pressure of 1.30atm and at a temperature of 41.0 degrees, is warmed until both pressure and volume are doubled. a)What is the final temp