TY - GEN
T1 - Bulk and interface characterization and modeling of copper indium aluminum gallium selenide (CIAGS) solar cells
AU - Sibakoti, Mandip J.
AU - Karthikeyan, Sreejith
AU - Hwang, Sehyun
AU - Bontrager, Timothy
AU - Campbell, Stephen A.
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2017
Y1 - 2017
N2 - The saturation of VOC at larger band gaps in Cu(In, Ga)Se2 devices presents a major challenge in developing high efficiency solar devices for tandem solar applications. Although recent studies have shown that recombination at the buffer/absorber interface dominates in high Ga samples with wide band gaps, the interface parameters are not well understood to accurately model the device behavior. In this work we have applied temperature dependent CV and DLCP methods to estimate the interface state density along the bandgap in CIGS and CIAGS based solar devices. We have also used DLTS to study the nature of deep levels in CIGS and CIAGS devices. Based on our analysis and device simulation results, we attribute the VOC saturation in wide gap CIAGS devices to increased recombination rate at the interface.
AB - The saturation of VOC at larger band gaps in Cu(In, Ga)Se2 devices presents a major challenge in developing high efficiency solar devices for tandem solar applications. Although recent studies have shown that recombination at the buffer/absorber interface dominates in high Ga samples with wide band gaps, the interface parameters are not well understood to accurately model the device behavior. In this work we have applied temperature dependent CV and DLCP methods to estimate the interface state density along the bandgap in CIGS and CIAGS based solar devices. We have also used DLTS to study the nature of deep levels in CIGS and CIAGS devices. Based on our analysis and device simulation results, we attribute the VOC saturation in wide gap CIAGS devices to increased recombination rate at the interface.
KW - CIAGS
KW - CIGS
KW - DLCP
KW - DLTS
KW - Electrical Characterization
KW - SCAPS modeling
KW - Wide band-gap solar cells
UR - http://www.scopus.com/inward/record.url?scp=85048514882&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85048514882&partnerID=8YFLogxK
U2 - 10.1109/PVSC.2017.8366517
DO - 10.1109/PVSC.2017.8366517
M3 - Conference contribution
AN - SCOPUS:85048514882
T3 - 2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017
SP - 1163
EP - 1168
BT - 2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 44th IEEE Photovoltaic Specialist Conference, PVSC 2017
Y2 - 25 June 2017 through 30 June 2017
ER -
