Photovoltaics from Milliwatts to Gigawatts. Tim Bruton
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Название: Photovoltaics from Milliwatts to Gigawatts

Автор: Tim Bruton

Издательство: John Wiley & Sons Limited

Жанр: Физика

Серия:

isbn: 9781119130062

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СКАЧАТЬ of a tandem cell, showing the tunnel junction. Source: N.J. Ekins-Daukes. (b) Associated band diagram, highlighting the tunnelling effect."/>

      Source: N.J. Ekins‐Daukes: in “Solar Cell Materials‐Developing Technologies” ed G J Conibeer and A Willoughby. Pub J Wiley (2014) 113‐143

      (b) Associated band diagram, highlighting the tunnelling effect [73]

      (Courtesy Wiley) Source: N.J. Ekins‐Daukes: in “Solar Cell Materials‐Developing Technologies” ed G J Conibeer and A Willoughby. Pub J Wiley (2014) 113‐143

      As already described, the availability of MOCVD deposition systems greatly assisted the development of III–V epitaxial growth. By 1995, the practical limit for a GaInP2/GaAs tandem cell of 30% was reached [74]. At the same time, efforts were underway to fabricate III–V cells for use in space. Germanium was preferred to GaAs as the substrate, as it was physically much more robust. Initially, it was only used as an inactive substrate, but its low bandgap at 0.7 eV made it ideal for use as the bottom cell in triple‐junction tandem. Initial production of single‐junction GaAs/Ge cells was reported in 1990, with AM0 spectrum cells achieving 18% efficiency for a 4 × 2 cm cell [75].

Schematic illustration of the structure of a very high-efficiency triple-junction tandem III–V solar cell.

      (Courtesy Wiley) Source: H. Yoon et al: Progress in Photovoltaics‐Research and Applications. 13 (2005) 133–139

Photo depicts the assembly of solar arrays for use in space.

      (Courtesy Spectrolab Corp)

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      31 31 СКАЧАТЬ