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:H3. Light trapping and TCO development

3

Fundamental 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-p

4

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

5

FF & jsc V.S. i-layer

6

Stacked cellsImprove 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

Sputteretch

11

Superstrate technology

12

Superstrate technology

13

Substrate technology

14

Substrate technology

15

Examples of highly efficient a-Si-based solar cells

16

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.

17

Thanks for your attention ！