Abstract
Understanding the spatial composition inhomogeneity in CIGS solar cells can provide insight into a potentially large cause of decreased cell efficiency. We used synchrotron based nano x-ray fluorescence and nano x-ray beam induduced current to investigate the correlation between grain-to-grain compositional variations in Cu(In,Ga)Se2 absorber layers and variations in carrier collection efficiency. We found compositional variations as large as 5 at. % and current variations as large as 10%. Grains with higher average copper concentration and lower indium concentration showed increased carrier collection than neighboring grains with lower copper and higher indium concentration. We also investigated the overall composition dependence of carrier collection in CIGS films and show that 30% gallium content devices show a correlation between charge carrier collection, while 60% content devices do not.
| Original language | English (US) |
|---|---|
| Title of host publication | 2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015 |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| ISBN (Print) | 9781479979448 |
| DOIs | |
| State | Published - Dec 14 2015 |
| Event | 42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States Duration: Jun 14 2015 → Jun 19 2015 |
Other
| Other | 42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 |
|---|---|
| Country | United States |
| City | New Orleans |
| Period | 6/14/15 → 6/19/15 |
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Keywords
- current measurement
- microstructure
- photovoltaic cells
- synchrotron radiation
- thin films
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
Cite this
Correlation between grain composition and charge carrier collection in Cu(In,Ga)Se2 solar cells. / West, Bradley; Husein, Sebastian; Stuckelberger, Michael; Lai, Barry; Maser, Jorg; Stripe, Benjamin; Rose, Volker; Guthrey, Harvey; Al-Jassim, Mowafak; Bertoni, Mariana.
2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015. Institute of Electrical and Electronics Engineers Inc., 2015. 7356154.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Correlation between grain composition and charge carrier collection in Cu(In,Ga)Se2 solar cells
AU - West, Bradley
AU - Husein, Sebastian
AU - Stuckelberger, Michael
AU - Lai, Barry
AU - Maser, Jorg
AU - Stripe, Benjamin
AU - Rose, Volker
AU - Guthrey, Harvey
AU - Al-Jassim, Mowafak
AU - Bertoni, Mariana
PY - 2015/12/14
Y1 - 2015/12/14
N2 - Understanding the spatial composition inhomogeneity in CIGS solar cells can provide insight into a potentially large cause of decreased cell efficiency. We used synchrotron based nano x-ray fluorescence and nano x-ray beam induduced current to investigate the correlation between grain-to-grain compositional variations in Cu(In,Ga)Se2 absorber layers and variations in carrier collection efficiency. We found compositional variations as large as 5 at. % and current variations as large as 10%. Grains with higher average copper concentration and lower indium concentration showed increased carrier collection than neighboring grains with lower copper and higher indium concentration. We also investigated the overall composition dependence of carrier collection in CIGS films and show that 30% gallium content devices show a correlation between charge carrier collection, while 60% content devices do not.
AB - Understanding the spatial composition inhomogeneity in CIGS solar cells can provide insight into a potentially large cause of decreased cell efficiency. We used synchrotron based nano x-ray fluorescence and nano x-ray beam induduced current to investigate the correlation between grain-to-grain compositional variations in Cu(In,Ga)Se2 absorber layers and variations in carrier collection efficiency. We found compositional variations as large as 5 at. % and current variations as large as 10%. Grains with higher average copper concentration and lower indium concentration showed increased carrier collection than neighboring grains with lower copper and higher indium concentration. We also investigated the overall composition dependence of carrier collection in CIGS films and show that 30% gallium content devices show a correlation between charge carrier collection, while 60% content devices do not.
KW - current measurement
KW - microstructure
KW - photovoltaic cells
KW - synchrotron radiation
KW - thin films
UR - http://www.scopus.com/inward/record.url?scp=84961629700&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84961629700&partnerID=8YFLogxK
U2 - 10.1109/PVSC.2015.7356154
DO - 10.1109/PVSC.2015.7356154
M3 - Conference contribution
AN - SCOPUS:84961629700
SN - 9781479979448
BT - 2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015
PB - Institute of Electrical and Electronics Engineers Inc.
ER -