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Potential of amorphous silicon for solar cells

Potential of amorphous silicon for solar cells. Appl. Phys. A 69, 155–167 (1999) / Digital Object Identifier (DOI) 10.1007/s003399900064 B. Rech , H. Wagner. 蕭子軒. Outline. 1. Fundamental properties of a- Si:H and its alloys 2. Solar cells based on a- Si:H

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Potential of amorphous silicon for solar cells

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  1. Potential of amorphous silicon for solar cells Appl. Phys. A 69, 155–167 (1999) / Digital Object Identifier (DOI) 10.1007/s003399900064 B. Rech, H. Wagner 蕭子軒

  2. Outline • 1. Fundamental properties of a-Si:H and its alloys • 2. Solar cells based on a-Si:H • 3. Light trapping and TCO development

  3. Fundamental properties of a-Si:H and its alloys • Disorder and the high content of bonded hydrogen • high optical absorption coefficients and recombination losses • SWE • PECVD • Band gap is around 1.7eV .(C , Ge) • P-i-n and n-i-p

  4. a-Si:H p-i-n solar cell

  5. FF & jsc V.S. i-layer

  6. Stacked cells • Improve the light stability • Use different band gaps for the component cells

  7. a-Si:H/a-Si:H/a-SiGe:H triple-junction solar cell

  8. Cell structures

  9. Roll-to-roll

  10. TCO • low electrical and optical losses, refractive index matching and light scattering • back reflection (with metal) • ITO、ZnO、SnO2 • Sputter • etch

  11. Superstrate technology

  12. Superstrate technology

  13. Substrate technology

  14. Substrate technology

  15. Examples of highly efficient a-Si-based solar cells

  16. Summary • Stabilized efficiencies exceeding 10% 。 13% for an a-Si:H/a-SiGe:H/a-SiGe:H triple-junction solar cell. • amorphous silicon solar cell technology holds a great potential to become a major energy source in the next century.

  17. Thanks for your attention ！

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