solar cell diode
Sun-powered electric options were once limited to large dark panels, but now consumers have a choice. Besides glass panels one or more solar panels, solar film or thin film solar units are available in boxes or building materials such as roof laminates. Each technology has its advantages. The choice depends on the budget, space, climate and aesthetics.
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The cells that make a crystalline photovoltaic module stand out as dark rectangles or octagons. A multi-crystalline cell often appears as a bright rectangle. The electrical connections, both technologies to show a pattern of silver lines.
"Thin-film" refers not to a specific material. These modules can be made of silicon amorphous (a-Si), copper indium gallium diselenide (CIGS) and cadmium telluride (CdTe). Amorphous silicon is popular for applications where the material is. Because you can put in plastic and glass, a-Si can be produced in continuous rolls flexible. Amorphous silicon is used in laminates, solar roof tiles and shingles.
Apart from the appearance and versatility, efficiency is a factor in the selection of the photovoltaic material. A convention framed lens system will produce more energy in less space. The flexible photovoltaic systems, while more aesthetically pleasing, are about half as efficient. This means a flexible system will have the dual module space to generate the same amount of energy than a conventional system.
This has a major effect on the system size. A three-meter rolling solar system can provide 60 to 70 W, with efficiencies up to 8%. A three by five feet lens module can provide 170 to 220 W, with up to 17% efficiency. However, power density is not the only consideration.
The cell temperature has an impact on the ability of the photovoltaic cell. Crystalline Modules lose efficiency at high temperatures. Film solar units are less sensitive to temperature, losing perhaps 2% of its power to 100F, compared with 6% loss power of a traditional lens system. The cell temperature can be modified to allow air flow around the system, but if the ambient temperature tend to be high, a thin film system may be the right choice.
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New amorphous silicon modules produce 20% of energy production to 25% more than rated. While this will stabilize the score normal production within six to twelve months, any system using these modules should be able to handle the increase in initial production. Traditional modules stabilize immediately, which eliminates this consideration. Once the a-Si modules are stabilized, degraded at a rate approximately equal to that of other systems.
Not all weather is sunny, so shade and low light performance can be an additional concern. Flexible Sun panel cells may be the same length as the module you are. These cells are less likely to be completely in the shade than crystalline cells, which are usually only five or six inches wide.
One type of technology that performs well in shade or low light conditions is used by the Uni-Solar products. These modules are flexible, and triple-junction cells are amorphous silicon. This technology allows bypass diodes for use within the module, so that any cell that is in the shade may be skipped. Moreover, the arrangement allows each element of the multi-junction cell capture different wavelength of light. This gives a better energy production in conditions where lighting is indirect or non-uniform.
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