Download Terawatt Solar Photovoltaics: Roadblocks and Opportunities by Meng Tao PDF

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By Meng Tao

Solar strength will surely turn into a first-rate resource of power in our existence by way of the tip of this century, yet how huge of a task will photovoltaics play during this new strength infrastructure? along with rate and potency, there are different boundaries for present sun telephone applied sciences to develop into a visible resource of strength sooner or later. Availability of uncooked fabrics, strength enter, garage of sun electrical energy, and recycling of lifeless modules can all hinder or prevent a tangible influence through sun photovoltaics. This booklet is meant for readers with minimum technical heritage and goals to discover not just the basics but additionally significant matters in large-scale deployment of sunlight photovoltaics. Thought-provoking principles to overcoming a few of the boundaries are discussed.

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E. delivering electric power to the load. The width of the potential gradient in a p-n junction is on the order of micrometer with the typical doping levels used in solar cells. In thin-film solar cells, the potential gradient often extends throughout the entire semiconductor absorber. This results in immediate separation of photo-generated electron and hole pairs as soon as they appear, as they are generated within the potential gradient. In wafer-Si solar cells, the wafer is much thicker, more than 100 times, than the width of the p-n junction and most of the photo-generated charge carriers are produced outside the junction region.

This is best illustrated by texturing of Si(100) wafers as the anisotropic nature of the single crystal allows a pyramidal surface texture. When a Si(100) wafer is immersed into a solution containing sodium hydroxide (NaOH), the etch rate on the (111) planes is much slower than on the (100) planes. This exposes the (111) planes in the crystal, resulting in pyramids of random sizes on the wafer. 10. If the surface reflectance is r and the incident solar intensity is Io, the amount of solar energy reflected after first incidence is rIo.

Delivering electric power to the load. The width of the potential gradient in a p-n junction is on the order of micrometer with the typical doping levels used in solar cells. In thin-film solar cells, the potential gradient often extends throughout the entire semiconductor absorber. This results in immediate separation of photo-generated electron and hole pairs as soon as they appear, as they are generated within the potential gradient. In wafer-Si solar cells, the wafer is much thicker, more than 100 times, than the width of the p-n junction and most of the photo-generated charge carriers are produced outside the junction region.

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