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- W1984012557 abstract "Two-step photon absorption processes in a self-organized In0.4Ga0.6As/GaAs quantum dot (QD) solar cell have been investigated by monitoring the mid-infrared (IR) photoinduced modulation of the external quantum efficiency (ΔEQE) at low temperature. The first step interband and the second step intraband transitions were both spectrally resolved by scanning photon energies of visible to near-IR CW light and mid-IR pulse lasers, respectively. A peak centered at 0.20 eV corresponding to the transition to virtual bound states and a band above 0.42 eV probably due to photoexcitation to GaAs continuum states were observed in ΔEQE spectra, when the interband transition was above 1.4 eV, directly exciting wetting layers or GaAs spacer layers. On the other hand, resonant excitation of the ground state of QDs at 1.35 eV resulted in a reduction of EQE. The sign of ΔEQE below 1.40 eV changed from negative to positive by increasing the excitation intensity of the interband transition. We ascribe this to the filling of higher energy trap states." @default.
- W1984012557 created "2016-06-24" @default.
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- W1984012557 date "2014-08-18" @default.
- W1984012557 modified "2023-10-01" @default.
- W1984012557 title "Spectrally resolved intraband transitions on two-step photon absorption in InGaAs/GaAs quantum dot solar cell" @default.
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- W1984012557 doi "https://doi.org/10.1063/1.4893879" @default.
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