A Sublimation Method to Create Complex Cadmium/Magnesium/Tellurium Thin Film Alloys
A chemical process for producing complex ternary thin film alloys using evaporative deposition over large areas.
This innovation is a method to incorporate magnesium (Mg) into cadmium telluridge (CdTe) thin films to create complex ternary alloys. The sublimation-based technique is suitable for deposition over large areas, making it applicable for the mass production of commercial grade, real world devices. The resulting films may be used as electron reflector structures in CdS/CdTe photovoltaic cells to increase cell efficiency and overall performance. The films may also have utility in IR detectors and other semiconductor devices.
This innovation is part of a large portfolio of thin film technologies specifically developed for CdTe photovoltaic devices but potentially applicable to a wide variety of thin film technologies. Thin film coated substrates are ubiquitous in today's society and have been used for numerous aspects of consumer electronics (from integrated circuit fabrication to cell phone, computer and television display coatings), optics (e.g., coating glass), microparticle fabrication, photovoltaic fabrication, and packaging (e.g., aluminum coating on plastic for potato chip bags).
- Commercial scale process deposits over large areas using sublimation-based technique
- Resulting films increase cell efficiency of CdS/CdTe photovoltaic devices
- Thin film solar photovoltaic
- Applicable to IR detectors and other devices
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METHODS FOR SUBLIMATION OF Mg AND INCORPORATION INTO CdTe FILMS TO FORM TERNARY COMPOSITIONS
A method for sublimating a thin film of Magnesium (Mg) on a semiconductor structure for improved efficiency is described. One embodiment includes a method comprised of providing a semiconductor substrate in a vacuum chamber, wherein the substrate comprises a window layer and an absorber layer made of CdTe. The method further includes heating the substrate to a diffusion temperature or greater followed by depositing a Mg film on the absorber layer using a sublimation process, wherein at least a portion of the Mg forms a Cd.sub.1-xMg.sub.xTe alloy within the absorber layer.
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