Advances in thin-film solar cells by I M Dharmadasa

By I M Dharmadasa

This ebook concentrates at the most recent advancements in our realizing of solid-state equipment physics. the cloth provided is principally experimental and in line with CdTe thin-film sunlight cells. It extends those new findings to CIGS thin-film sun cells and offers a brand new equipment layout in keeping with graded bandgap multilayer sun cells. This layout has been experimentally validated utilizing the well-researched GaAs/AlGaAs process and preliminary units have proven outstanding equipment parameters. those units are able to soaking up all radiation (UV, obvious, and infra-red) in the sunlight spectrum and combines "impact ionization" and "impurity photovoltaic" results. the enhanced machine knowing awarded during this ebook may still impression and consultant destiny machine layout and reasonably cheap thin-film sun panel manufacture.

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The main steps of growth of Si and device fabrication are given in Fig. 2. Si is produced starting with natural sand (SiO2 ), followed by four processing steps: (a) purification process, (b) crystallisation and wafer production, (c) processing of Si solar cells, and (d) assembly of the solar panels. This needs four different production lines, and these are summarised in Fig. 2. Each of these average-sized (∼25 MW) production lines could cost millions of dollars for the initial establishment. In addition, the whole process of converting sand into solar panels requires the heating of Si above its melting point (1,414◦ C), and repeated heating to high temperatures above 1,000◦ C, during solar cell fabrication.

Hydrogen passivation and sulphur passivation are well-known phenomena in the growth of silicon and surface preparation of GaAs. The electrodeposition from aqueous solutions has a built-in hydrogen passivation mechanism since H+ ions are also attracted to the surface of the cathode and discharged together with other semiconductor elements. Any dangling bonds formed during the formation of the semiconductor are immediately passivated by the most active hydrogen atoms produced after the discharge of H+ ions.

1 A time line of PV solar energy technology 1839: The PV effect was discovered by Edmund Becquerel when he was 19 years old. 1883: The first solar cell using elemental Se as the light-absorbing material was developed. 1916: Millikan provided experimental proof of the photoelectric effect. 1918: Czochralski developed a method to grow single-crystal Si. 1923: Albert Einstein won the Nobel Prize for explaining the photoelectric effect. 5% efficient Si solar cells were produced at Bell labs. 1959: 10% efficient Si cells were produced, and the satellite Explorer-6 was launched by the United States with a PV array of 9,600 cells.

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