TY - GEN
T1 - Impact of threshold energy of multiple exciton generation solar cells
AU - Lee, Jongwon
AU - Honsberg, Christiana
PY - 2013
Y1 - 2013
N2 - The threshold energy (Eth) over 100% quantum yield (QY) is a key factor to determine the performance of multiple exciton generation (MEG) solar cells. By investigating non-idealities of MEG models, it is critical to consider non-idealities in Eth for the onset of MEG processes. Detailed balance calculations show that despite a large experimental emphasis on the maximum quantum yield, the threshold energy has a substantial and significant effect. The first effect is that at threshold energies between 2 and 3Eg (for one sun) or 3 and 4Eg for maximum concentration, even theoretical benefits of the MEG process disappear. Since measured values are within this range, this is an important effect to consider. The second effect is that the inclusion of non-ideal threshold energies increases the optimum band gap, moving to values consistent with silicon.
AB - The threshold energy (Eth) over 100% quantum yield (QY) is a key factor to determine the performance of multiple exciton generation (MEG) solar cells. By investigating non-idealities of MEG models, it is critical to consider non-idealities in Eth for the onset of MEG processes. Detailed balance calculations show that despite a large experimental emphasis on the maximum quantum yield, the threshold energy has a substantial and significant effect. The first effect is that at threshold energies between 2 and 3Eg (for one sun) or 3 and 4Eg for maximum concentration, even theoretical benefits of the MEG process disappear. Since measured values are within this range, this is an important effect to consider. The second effect is that the inclusion of non-ideal threshold energies increases the optimum band gap, moving to values consistent with silicon.
KW - Detailed balance calculations
KW - Multiple exciton generation solar cells
KW - Quantum yield
KW - Thermodynamic limit
KW - Threshold energy
UR - http://www.scopus.com/inward/record.url?scp=84896487329&partnerID=8YFLogxK
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U2 - 10.1109/PVSC.2013.6744321
DO - 10.1109/PVSC.2013.6744321
M3 - Conference contribution
AN - SCOPUS:84896487329
SN - 9781479932993
T3 - Conference Record of the IEEE Photovoltaic Specialists Conference
SP - 1050
EP - 1053
BT - 39th IEEE Photovoltaic Specialists Conference, PVSC 2013
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 39th IEEE Photovoltaic Specialists Conference, PVSC 2013
Y2 - 16 June 2013 through 21 June 2013
ER -