Details
| Original language | English |
|---|---|
| Article number | 6264076 |
| Pages (from-to) | 77-82 |
| Number of pages | 6 |
| Journal | IEEE journal of photovoltaics |
| Volume | 3 |
| Issue number | 1 |
| Publication status | Published - 9 Aug 2012 |
Abstract
We demonstrate the interconnection of silicon solar cells with evaporated aluminum back contacts using an aluminum foil which is attached to a silicone encapsulant. The aluminum-based mechanical and electrical laser interconnection (AMELI) process forms laser weld spots using single laser pulses. These laser welds resist high mechanical stresses and have a low electrical contact resistivity. No solder, conductive adhesives, or Ag-pastes are required for interconnection. We find the electrical contact resistivity to be below ρ c = 0.01 mΩ·cm2. The contact resistance is constant under accelerated aging of 300 humidity-freeze cycles. With a tensile testing machine, we measure tear-off stresses in the perpendicular direction of up to 380 kPa for our laser weld spots. We present a proof-of-concept module which consists of five n-type back-junction back-contact solar cells with a conversion efficiency of 20.4%. The unchanged fill factor FF and open circuit voltage V\rm oc verify a damage-and loss-free interconnection which is supported by electroluminescence measurements.
Keywords
- Al-metallization, back-contact solar cells, laser microwelding, lead-free, module-level inter-connection, photovoltaic module
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Electrical and Electronic Engineering
Sustainable Development Goals
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In: IEEE journal of photovoltaics, Vol. 3, No. 1, 6264076, 09.08.2012, p. 77-82.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Al-Foil on Encapsulant for the Interconnection of Al-Metalized Silicon Solar Cells
AU - Schulte-Huxel, Henning
AU - Blankemeyer, Susanne
AU - Bock, Robert
AU - Merkle, Agnes
AU - Kajari-Schröder, Sarah
AU - Brendel, Rolf
PY - 2012/8/9
Y1 - 2012/8/9
N2 - We demonstrate the interconnection of silicon solar cells with evaporated aluminum back contacts using an aluminum foil which is attached to a silicone encapsulant. The aluminum-based mechanical and electrical laser interconnection (AMELI) process forms laser weld spots using single laser pulses. These laser welds resist high mechanical stresses and have a low electrical contact resistivity. No solder, conductive adhesives, or Ag-pastes are required for interconnection. We find the electrical contact resistivity to be below ρ c = 0.01 mΩ·cm2. The contact resistance is constant under accelerated aging of 300 humidity-freeze cycles. With a tensile testing machine, we measure tear-off stresses in the perpendicular direction of up to 380 kPa for our laser weld spots. We present a proof-of-concept module which consists of five n-type back-junction back-contact solar cells with a conversion efficiency of 20.4%. The unchanged fill factor FF and open circuit voltage V\rm oc verify a damage-and loss-free interconnection which is supported by electroluminescence measurements.
AB - We demonstrate the interconnection of silicon solar cells with evaporated aluminum back contacts using an aluminum foil which is attached to a silicone encapsulant. The aluminum-based mechanical and electrical laser interconnection (AMELI) process forms laser weld spots using single laser pulses. These laser welds resist high mechanical stresses and have a low electrical contact resistivity. No solder, conductive adhesives, or Ag-pastes are required for interconnection. We find the electrical contact resistivity to be below ρ c = 0.01 mΩ·cm2. The contact resistance is constant under accelerated aging of 300 humidity-freeze cycles. With a tensile testing machine, we measure tear-off stresses in the perpendicular direction of up to 380 kPa for our laser weld spots. We present a proof-of-concept module which consists of five n-type back-junction back-contact solar cells with a conversion efficiency of 20.4%. The unchanged fill factor FF and open circuit voltage V\rm oc verify a damage-and loss-free interconnection which is supported by electroluminescence measurements.
KW - Al-metallization
KW - back-contact solar cells
KW - laser microwelding
KW - lead-free
KW - module-level inter-connection
KW - photovoltaic module
UR - http://www.scopus.com/inward/record.url?scp=84871737750&partnerID=8YFLogxK
U2 - 10.1109/JPHOTOV.2012.2208096
DO - 10.1109/JPHOTOV.2012.2208096
M3 - Article
AN - SCOPUS:84871737750
VL - 3
SP - 77
EP - 82
JO - IEEE journal of photovoltaics
JF - IEEE journal of photovoltaics
SN - 2156-3381
IS - 1
M1 - 6264076
ER -