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Potential of amorphous silicon for solar cellsAppl. Phys. A 69, 155167 (1999) / Digital Object Identifier (DOI) 10.1007/s003399900064B. Rech, H. Wagner1Outline1. Fundamental properties of a-Si:H and its alloys2. Solar cells based on a-Si:H3. Light trapping and TCO development

2Fundamental properties of a-Si:H and its alloysDisorder and the high content of bonded hydrogenhigh optical absorption coefficients and recombination lossesSWEPECVDBand gap is around 1.7 eV .(C , Ge)P-i-n and n-i-p3a-Si:H p-i-n solar cell4

FF & jsc V.S. i-layer5

Stacked cellsImprove the light stability Use different band gaps for the component cells6

a-Si:H/a-Si:H/a-SiGe:H triple-junction solar cell7

Cell structures8

8Roll-to-roll9

TCO low electrical and optical losses, refractive index matching and light scatteringback reflection (with metal) ITOZnOSnO2Sputteretch10Superstrate technology11

Superstrate technology12

Substrate technology13

Substrate technology14

Examples of highly efficient a-Si-based solar cells

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SummaryStabilized 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. 16Thanks for your attention

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