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Fabrication of solar cells on cheap plastics, due to its demand for a low temperature processing (~100?C) needs adaptation of the cell structure of the state-of-the-art high efficiency thin film silicon solar cells made at high temperature (200?C). Use of a double n-layer (n-?c-Si/n-a-Si) instead of a single n-?c-Si layer improves Voc from a low 0.66 V to 0.82 V in the as deposited state of an n-i-p...
In this contribution we report the result of an a-Si/μc-Si tandem thin film silicon solar mini-module deposited on plastic foil containing intrinsic layers made by hot-wire CVD (eff. ≫ 7%, series-connected with aperture area 25 cm2). We used the Helianthos cell transfer process. The cells were first deposited on a temporary aluminum foil carrier, which allows using optimal process temperatures, and...
Fabrication of thin film silicon solar cells on cheap plastics or paper-like substrate requires deposition process at very low substrate temperature, typically ≤ 100 °C. In a chemical vapor deposition process, low growth temperatures lead to materials with low density, high porosity, high disorder and high defect density. This can be partly attributed to the small diffusion length of precursors on...
We have incorporated amorphous silicon i-layers made by amplitude modulated VHF plasma CVD into n-i-p solar cells. The cell efficiencies are similar to those obtained with standard device quality continuous wave (CW) a-Si:H i-layers, but at a high growth of 0.55 nm/s and gas utilization rate of /spl sim/50%. Due to the combined effect the efficient use of the SiH/sub 4/ is roughly 10 times better...
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