Details
| Original language | English |
|---|---|
| Pages (from-to) | 95-102 |
| Number of pages | 8 |
| Journal | Energy Procedia |
| Volume | 27 |
| Early online date | 25 Aug 2011 |
| Publication status | Published - 2012 |
| Event | 2nd International Conference on Crystalline Silicon Photovoltaics, SiliconPV 2012 - Leuven, Belgium Duration: 3 Apr 2012 → 5 Apr 2012 |
Abstract
In this paper, we investigate the impact of the rear surface passivation, the silicon base material and the local aluminum contacts applied to rear side passivated solar cells with a homogenously doped emitter at the front. We compare different dielectric surface passivation layers (SiO2, Al2O3, SiNx) on a high-efficiency level using 125×125 mm2 and 156×156 mm2 p-type Cz silicon wafers. It turns out that applying an Al2O3/SiN x layer stack outperforms all other surface passivation layers due to its excellent surface passivation as well as optical properties. We determine the impact of the light induced degradation depending on the used Cz base material. We measure an efficiency drop between 0.0 % (Ga-doped) and 0.8 % abs. (B-doped) after 8 hours of illumination under 0.5 Suns. We measure the surface recombination velocity of local screen-printed Al contacts with varying the metallisation fraction frear with the dynamic infrared lifetime mapping technique (dyn-ILM) on lifetime samples. We measure a decrease in contact recombination velocity from above 1100 cm/s for small frear to 400 cm/s for large frear on 1.5 Ωcm p-type FZ-silicon. Microscopy investigations show that this is due to an improved local Al-BSF formation when using higher frear.
Keywords
- Photovoltaics, Silicon, Solar Cells, Surface Passivation
ASJC Scopus subject areas
- Energy(all)
- General Energy
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In: Energy Procedia, Vol. 27, 2012, p. 95-102.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Analysis and Optimization of the Bulk and Rear Recombination of Screen-Printed PERC Solar Cells
AU - Gatz, S.
AU - Müller, J.
AU - Dullweber, T.
AU - Brendel, R.
PY - 2012
Y1 - 2012
N2 - In this paper, we investigate the impact of the rear surface passivation, the silicon base material and the local aluminum contacts applied to rear side passivated solar cells with a homogenously doped emitter at the front. We compare different dielectric surface passivation layers (SiO2, Al2O3, SiNx) on a high-efficiency level using 125×125 mm2 and 156×156 mm2 p-type Cz silicon wafers. It turns out that applying an Al2O3/SiN x layer stack outperforms all other surface passivation layers due to its excellent surface passivation as well as optical properties. We determine the impact of the light induced degradation depending on the used Cz base material. We measure an efficiency drop between 0.0 % (Ga-doped) and 0.8 % abs. (B-doped) after 8 hours of illumination under 0.5 Suns. We measure the surface recombination velocity of local screen-printed Al contacts with varying the metallisation fraction frear with the dynamic infrared lifetime mapping technique (dyn-ILM) on lifetime samples. We measure a decrease in contact recombination velocity from above 1100 cm/s for small frear to 400 cm/s for large frear on 1.5 Ωcm p-type FZ-silicon. Microscopy investigations show that this is due to an improved local Al-BSF formation when using higher frear.
AB - In this paper, we investigate the impact of the rear surface passivation, the silicon base material and the local aluminum contacts applied to rear side passivated solar cells with a homogenously doped emitter at the front. We compare different dielectric surface passivation layers (SiO2, Al2O3, SiNx) on a high-efficiency level using 125×125 mm2 and 156×156 mm2 p-type Cz silicon wafers. It turns out that applying an Al2O3/SiN x layer stack outperforms all other surface passivation layers due to its excellent surface passivation as well as optical properties. We determine the impact of the light induced degradation depending on the used Cz base material. We measure an efficiency drop between 0.0 % (Ga-doped) and 0.8 % abs. (B-doped) after 8 hours of illumination under 0.5 Suns. We measure the surface recombination velocity of local screen-printed Al contacts with varying the metallisation fraction frear with the dynamic infrared lifetime mapping technique (dyn-ILM) on lifetime samples. We measure a decrease in contact recombination velocity from above 1100 cm/s for small frear to 400 cm/s for large frear on 1.5 Ωcm p-type FZ-silicon. Microscopy investigations show that this is due to an improved local Al-BSF formation when using higher frear.
KW - Photovoltaics
KW - Silicon
KW - Solar Cells
KW - Surface Passivation
UR - http://www.scopus.com/inward/record.url?scp=84874634637&partnerID=8YFLogxK
U2 - 10.1016/j.egypro.2012.07.035
DO - 10.1016/j.egypro.2012.07.035
M3 - Conference article
AN - SCOPUS:84874634637
VL - 27
SP - 95
EP - 102
JO - Energy Procedia
JF - Energy Procedia
SN - 1876-6102
T2 - 2nd International Conference on Crystalline Silicon Photovoltaics, SiliconPV 2012
Y2 - 3 April 2012 through 5 April 2012
ER -