Final published version
Licence: CC BY: Creative Commons Attribution 4.0 International License
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Hole capture and emission dynamics of type-II GaSb/GaAs quantum ring solar cells
AU - Wagener, Magnus C.
AU - Montesdeoca Cardenes, Denise
AU - Lu, Qi
AU - Marshall, Andrew Robert Julian
AU - Krier, Anthony
AU - Botha, Johannes Reinhardt
AU - Carrington, Peter James
PY - 2019/1
Y1 - 2019/1
N2 - The capture cross-section, intersubband optical cross-section and non-radiative emission rates related to localized hole states are obtained for p-i-n solar cells containing GaSb/GaAs quantum rings embedded within the i-region of the device. The technique developed uses the intraband photoemission current to probe the charge state of the nanostructures during two-color excitation. Analysis of the excitation power dependence revealed a non-radiative hole capture lifetime of 12 ns under low excitation conditions, with high injection leading to the saturation of the hole occupancy within the quantum-rings. The decay characteristics of the optical hole emission current has also been exploited to determine the spectral and temperature dependence of the radiative and non-radiative hole escape mechanisms from the quantum-rings.
AB - The capture cross-section, intersubband optical cross-section and non-radiative emission rates related to localized hole states are obtained for p-i-n solar cells containing GaSb/GaAs quantum rings embedded within the i-region of the device. The technique developed uses the intraband photoemission current to probe the charge state of the nanostructures during two-color excitation. Analysis of the excitation power dependence revealed a non-radiative hole capture lifetime of 12 ns under low excitation conditions, with high injection leading to the saturation of the hole occupancy within the quantum-rings. The decay characteristics of the optical hole emission current has also been exploited to determine the spectral and temperature dependence of the radiative and non-radiative hole escape mechanisms from the quantum-rings.
KW - Capture cross-section
KW - Interband
KW - Intermediate band
KW - Intraband
KW - Optoelectronic properties
KW - Quantum dot solar cell
U2 - 10.1016/j.solmat.2018.07.030
DO - 10.1016/j.solmat.2018.07.030
M3 - Journal article
VL - 189
SP - 233
EP - 238
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
SN - 0927-0248
ER -