TY - GEN
T1 - A-Si:H/c-Si heterojunctions
T2 - 38th IEEE Photovoltaic Specialists Conference, PVSC 2012
AU - Ballif, Christophe
AU - Barraud, Loris
AU - Descoeudres, Antoine
AU - Holman, Zachary C.
AU - Morel, Sophie
AU - De Wolf, Stefaan
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - In this contribution, we shortly review the main features of amorphous /crystalline silicon heterojunction (SHJ) solar cells, including interface defects and requirements for high quality interfaces. We show how a process flow with a limited number of process steps leads to screen printed solar cells of 2×2cm2 with 21.8% efficiency and of 10×10cm2 with 20.9% efficiency (n-type FZ). We show that the devices work in high injection conditions of 3×1015cm3 at the maximum power point, a factor two higher than the base doping. Several research labs and companies can now produce large area 6 cells well over 20% on CZ wafers and some of the critical cost factors, such a metallization can be overcome with suitable strategies. Based on the high quality coating tools and processes developed for thin films used for flat panel display or thin film solar cell coatings, the deposition of the layers required to make SHJ cells has the potential to be performed in a controlled way at low cost. Considering the few process steps required, the high quality n-type Cz wafers that can be obtained by proper crystal growth control, SHJ technology has several assets that could make it become a widespread PV technology.
AB - In this contribution, we shortly review the main features of amorphous /crystalline silicon heterojunction (SHJ) solar cells, including interface defects and requirements for high quality interfaces. We show how a process flow with a limited number of process steps leads to screen printed solar cells of 2×2cm2 with 21.8% efficiency and of 10×10cm2 with 20.9% efficiency (n-type FZ). We show that the devices work in high injection conditions of 3×1015cm3 at the maximum power point, a factor two higher than the base doping. Several research labs and companies can now produce large area 6 cells well over 20% on CZ wafers and some of the critical cost factors, such a metallization can be overcome with suitable strategies. Based on the high quality coating tools and processes developed for thin films used for flat panel display or thin film solar cell coatings, the deposition of the layers required to make SHJ cells has the potential to be performed in a controlled way at low cost. Considering the few process steps required, the high quality n-type Cz wafers that can be obtained by proper crystal growth control, SHJ technology has several assets that could make it become a widespread PV technology.
KW - amorphous silicon
KW - crystalline silicon
KW - silicon heterojunction solar cells
UR - http://www.scopus.com/inward/record.url?scp=84869406769&partnerID=8YFLogxK
U2 - 10.1109/PVSC.2012.6317924
DO - 10.1109/PVSC.2012.6317924
M3 - Conference contribution
AN - SCOPUS:84869406769
SN - 9781467300643
T3 - Conference Record of the IEEE Photovoltaic Specialists Conference
SP - 1705
EP - 1709
BT - Program - 38th IEEE Photovoltaic Specialists Conference, PVSC 2012
Y2 - 3 June 2012 through 8 June 2012
ER -