Details
| Original language | English |
|---|---|
| Pages (from-to) | 3046-3052 |
| Number of pages | 7 |
| Journal | Physica Status Solidi (A) Applications and Materials Science |
| Volume | 213 |
| Issue number | 11 |
| Early online date | 18 Jul 2016 |
| Publication status | Published - 1 Nov 2016 |
Abstract
The solar industry is introducing p-type monofacial passivated emitter and rear cells (PERC) into mass production. However, the efficiency of p-type PERC cells is subject to light-induced degradation (LID). In this paper, we introduce a novel solar cell design which we name BiCoRE as abbreviation of “bifacial co-diffused rear emitter.” The BiCoRE cell process is very similar to the high volume proven PERC process sequence, but uses LID stable n-type wafers. A boron silicate glass (BSG) silicon nitride (SiNz) stack at the rear side of the BiCoRE cells acts as protection layer against texturing and POCl3 diffusion, as boron dopant source during the POCl3 co-diffusion as well as passivation layer. The rear contacts are formed by laser contact opening (LCO) and screen printing of an Al finger grid similar to the recently introduced PERC+ solar cells. The Al finger grid enables bifaciality and results in up to 8.5 μm deep aluminum back surface fields (Al-BSFs) and up to 21.1% conversion efficiency obtained with n-type reference solar cells. The multifunctional BSG/SiNz stack demonstrates up to 20.6% conversion efficiency with BiCoRE solar cells. When illuminated from the rear side, the BiCoRE cells exhibit conversion efficiencies up to 16.1% which corresponds to a bifaciality of 78%.
Keywords
- aluminum, boron, boron silicate glass, emitters, silicon, solar cells
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
- Engineering(all)
- Electrical and Electronic Engineering
- Materials Science(all)
- Materials Chemistry
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In: Physica Status Solidi (A) Applications and Materials Science, Vol. 213, No. 11, 01.11.2016, p. 3046-3052.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Industrial bifacial n-type silicon solar cells applying a boron co-diffused rear emitter and an aluminum rear finger grid
AU - Dullweber, Thorsten
AU - Wehmeier, Nadine
AU - Nowack, Anja
AU - Brendemühl, Till
AU - Kajari-Schröder, Sarah
AU - Brendel, Rolf
N1 - Funding Information: We thank our colleagues Miriam Berger for solar cell processing, Frank Heinemeyer for SEM measurements, and David Hinken for support in the IQE analysis.This work was funded by the German Federal Ministry for Economic Affairs and Energy under contract number 0325880A(PERC 2.0).
PY - 2016/11/1
Y1 - 2016/11/1
N2 - The solar industry is introducing p-type monofacial passivated emitter and rear cells (PERC) into mass production. However, the efficiency of p-type PERC cells is subject to light-induced degradation (LID). In this paper, we introduce a novel solar cell design which we name BiCoRE as abbreviation of “bifacial co-diffused rear emitter.” The BiCoRE cell process is very similar to the high volume proven PERC process sequence, but uses LID stable n-type wafers. A boron silicate glass (BSG) silicon nitride (SiNz) stack at the rear side of the BiCoRE cells acts as protection layer against texturing and POCl3 diffusion, as boron dopant source during the POCl3 co-diffusion as well as passivation layer. The rear contacts are formed by laser contact opening (LCO) and screen printing of an Al finger grid similar to the recently introduced PERC+ solar cells. The Al finger grid enables bifaciality and results in up to 8.5 μm deep aluminum back surface fields (Al-BSFs) and up to 21.1% conversion efficiency obtained with n-type reference solar cells. The multifunctional BSG/SiNz stack demonstrates up to 20.6% conversion efficiency with BiCoRE solar cells. When illuminated from the rear side, the BiCoRE cells exhibit conversion efficiencies up to 16.1% which corresponds to a bifaciality of 78%.
AB - The solar industry is introducing p-type monofacial passivated emitter and rear cells (PERC) into mass production. However, the efficiency of p-type PERC cells is subject to light-induced degradation (LID). In this paper, we introduce a novel solar cell design which we name BiCoRE as abbreviation of “bifacial co-diffused rear emitter.” The BiCoRE cell process is very similar to the high volume proven PERC process sequence, but uses LID stable n-type wafers. A boron silicate glass (BSG) silicon nitride (SiNz) stack at the rear side of the BiCoRE cells acts as protection layer against texturing and POCl3 diffusion, as boron dopant source during the POCl3 co-diffusion as well as passivation layer. The rear contacts are formed by laser contact opening (LCO) and screen printing of an Al finger grid similar to the recently introduced PERC+ solar cells. The Al finger grid enables bifaciality and results in up to 8.5 μm deep aluminum back surface fields (Al-BSFs) and up to 21.1% conversion efficiency obtained with n-type reference solar cells. The multifunctional BSG/SiNz stack demonstrates up to 20.6% conversion efficiency with BiCoRE solar cells. When illuminated from the rear side, the BiCoRE cells exhibit conversion efficiencies up to 16.1% which corresponds to a bifaciality of 78%.
KW - aluminum
KW - boron
KW - boron silicate glass
KW - emitters
KW - silicon
KW - solar cells
UR - http://www.scopus.com/inward/record.url?scp=84978828635&partnerID=8YFLogxK
U2 - 10.1002/pssa.201600346
DO - 10.1002/pssa.201600346
M3 - Article
AN - SCOPUS:84978828635
VL - 213
SP - 3046
EP - 3052
JO - Physica Status Solidi (A) Applications and Materials Science
JF - Physica Status Solidi (A) Applications and Materials Science
SN - 1862-6300
IS - 11
ER -