2014
DOI: 10.1063/1.4892826
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Suppression of thermal carrier escape and efficient photo-carrier generation by two-step photon absorption in InAs quantum dot intermediate-band solar cells using a dot-in-well structure

Abstract: We investigated the effects of an increase in the barrier height on the enhancement of the efficiency of two-step photo-excitation in InAs quantum dot (QD) solar cells with a dot-in-well structure. Thermal carrier escape of electrons pumped in QD states was drastically reduced by sandwiching InAs/GaAs QDs with a high potential barrier of Al0.3Ga0.7As. The thermal activation energy increased with the introduction of the barrier. The high potential barrier caused suppression of thermal carrier escape and helped … Show more

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Cited by 31 publications
(33 citation statements)
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“…In this wavelength region, the EQE signal also shows a gradual decrease with increasing wavelength because the optical absorption coefficient becomes small with increasing wavelength. In the near-IR wavelength region below the bandgap of GaAs, the EQE signal decreases drastically and shows a small structure at 912 nm that can be attributed to thermally excited carriers from the deep quantized states of the InAs wetting layer2140.…”
Section: Resultsmentioning
confidence: 99%
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“…In this wavelength region, the EQE signal also shows a gradual decrease with increasing wavelength because the optical absorption coefficient becomes small with increasing wavelength. In the near-IR wavelength region below the bandgap of GaAs, the EQE signal decreases drastically and shows a small structure at 912 nm that can be attributed to thermally excited carriers from the deep quantized states of the InAs wetting layer2140.…”
Section: Resultsmentioning
confidence: 99%
“…According to ideal theoretical predictions, the IBSC is expected to exhibit extremely high conversion efficiency, >60%, under the maximum concentration and 48.2% under one-sun irradiation5. Substantial progress has been made in this field101112131415161718192021222324252627 since Luque and Martí have proposed this concept of IBSC in 1997 (ref. 5).…”
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confidence: 99%
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“…6 To enable quasi-Fermi level splitting between IB and CB, thermal escape should be suppressed. Therefore, although experimental observation of the second photon absorption has been observed at both low temperature [9][10][11] and room temperature, [12][13][14] the voltage preservation so far has only been shown at low temperature. 15,16 To increase the a) Now at Finisar Corporation.…”
Section: Introductionmentioning
confidence: 99%
“…EQE spectra below the edge of DWELL-IBSC (solid line) and QD-IBSC (broken line). The horizontal axis indicates the energy difference from the band edge 8). ΔEQE (IR on − IR off ) a) EQE spectra below the band edge of Al 0.3 Ga 0.7 As with and without the IR laser.…”
mentioning
confidence: 99%