Details
| Original language | English |
|---|---|
| Article number | 6006497 |
| Pages (from-to) | 37-42 |
| Number of pages | 6 |
| Journal | IEEE Journal of Photovoltaics |
| Volume | 1 |
| Issue number | 1 |
| Publication status | Published - Jul 2011 |
Abstract
We demonstrate industrially feasible large-area solar cells with passivated homogenous emitter and rear achieving energy conversion efficiencies of up to 19.4% on 125 mm×125mm p-type 2-3Ω·cm boron-doped Czochralski silicon wafers. Front and rear metal contacts are fabricated by screen printing of silver and aluminum paste and firing in a conventional belt furnace. However, these cells suffer from moderate fill factors below 76% due to an increased series resistance. In this paper, we analyze the main cause of this increase. We vary the rear contact geometry over a wide range. By subtracting the respective contribution of the base from the measured series resistance, we extract a value of (55±10) mOmega;·cm 2 for the effective specific contact resistivity of our screen-printed local aluminum rear contacts. We verify this value by local series resistance mappings from photoluminescence measurements resulting in a contact resistivity of (40±10) mOmega;·cm 2. Our analysis reveals that the highest potential for a further energy conversion efficiency improvement is to decrease the rear contact resistivity.
Keywords
- Photovoltaics, resistance, silicon, solar cells
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
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In: IEEE Journal of Photovoltaics, Vol. 1, No. 1, 6006497, 07.2011, p. 37-42.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Evaluation of Series Resistance Losses in Screen-Printed Solar Cells With Local Rear Contacts
AU - Gatz, Sebastian
AU - Dullweber, Thorsten
AU - Brendel, Rolf
PY - 2011/7
Y1 - 2011/7
N2 - We demonstrate industrially feasible large-area solar cells with passivated homogenous emitter and rear achieving energy conversion efficiencies of up to 19.4% on 125 mm×125mm p-type 2-3Ω·cm boron-doped Czochralski silicon wafers. Front and rear metal contacts are fabricated by screen printing of silver and aluminum paste and firing in a conventional belt furnace. However, these cells suffer from moderate fill factors below 76% due to an increased series resistance. In this paper, we analyze the main cause of this increase. We vary the rear contact geometry over a wide range. By subtracting the respective contribution of the base from the measured series resistance, we extract a value of (55±10) mOmega;·cm 2 for the effective specific contact resistivity of our screen-printed local aluminum rear contacts. We verify this value by local series resistance mappings from photoluminescence measurements resulting in a contact resistivity of (40±10) mOmega;·cm 2. Our analysis reveals that the highest potential for a further energy conversion efficiency improvement is to decrease the rear contact resistivity.
AB - We demonstrate industrially feasible large-area solar cells with passivated homogenous emitter and rear achieving energy conversion efficiencies of up to 19.4% on 125 mm×125mm p-type 2-3Ω·cm boron-doped Czochralski silicon wafers. Front and rear metal contacts are fabricated by screen printing of silver and aluminum paste and firing in a conventional belt furnace. However, these cells suffer from moderate fill factors below 76% due to an increased series resistance. In this paper, we analyze the main cause of this increase. We vary the rear contact geometry over a wide range. By subtracting the respective contribution of the base from the measured series resistance, we extract a value of (55±10) mOmega;·cm 2 for the effective specific contact resistivity of our screen-printed local aluminum rear contacts. We verify this value by local series resistance mappings from photoluminescence measurements resulting in a contact resistivity of (40±10) mOmega;·cm 2. Our analysis reveals that the highest potential for a further energy conversion efficiency improvement is to decrease the rear contact resistivity.
KW - Photovoltaics
KW - resistance
KW - silicon
KW - solar cells
UR - http://www.scopus.com/inward/record.url?scp=84865174608&partnerID=8YFLogxK
U2 - 10.1109/JPHOTOV.2011.2163925
DO - 10.1109/JPHOTOV.2011.2163925
M3 - Article
AN - SCOPUS:84865174608
VL - 1
SP - 37
EP - 42
JO - IEEE Journal of Photovoltaics
JF - IEEE Journal of Photovoltaics
SN - 2156-3381
IS - 1
M1 - 6006497
ER -