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(Color online) PC spectra at 300 K under a xenon lamp. Inset: relative PC intensities. Sample A: InAs QDs in the i region; B: QDs in the n region; C: without QDs.
(Color online) (a) PC spectra at 300 K under a quartz-halogen tungsten lamp. (b) GaAs-filtered PC spectra. 1–7 mark optical absorptions ofQDs.
(a) Reduced electron mobility by QD induced potential variation. (b) Difficulty to extract photocarriers from low-energy QD level.
(Color online) Wave functions of CB electron and VB hole with a transition energy ℏω = 1.593 eV (above the GaAs bandgap). Also presented are the schematic CB and VB of GaAs embedded with InAs QDs modelled as one-dimensional QWs.
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