CdTe for thin film PV
Release Date[2014-7-23 13:09:25]    Total access[34]Times

CdTe-based thin-film solar cell modules currently represent one of the fastest-growing segments of commercial module production. This is due partly to the simplicity of the two-component absorber layer (i.e., CdTe contains only cadmium and tellurium) and the ability of bulk cadmium telluride source material (in the form of high-purity powders) to be reconstructed into the CdTe thin films needed to produce PV modules,much effort has been directed at producing CdTe structures that allow more light to penetrate the top layers of the device (the transparent conducting contacts and cadmium sulfide [CdS] layers) to achieve high efficiency. This understanding has been transferred to commercial processes for use in producing higher-performance modules.

CdTe Technology

  • High-Temperature Transparent Conductors and Buffer Layers.The cadmium telluride layer of the highest-performance devices is deposited at ∼500属650属C. Because this layer is deposited onto an existing transparent conductor layer, the industry requires alternative types of layers that can tolerate this temperature while allowing high transmission,Cd2SnO4and Zn2SnO4layers for this use.
  • CdTe Junction Functionality. Although it is relatively easy to produce 10%-efficient cadmium telluride devices, scientists have only recently come to understand how the device forms during various process steps. This understanding provides a critical foundation for industry on which to develop cost-effective processes that yield high-performance, stable CdTe modules.


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