Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3147162
Keywords
photoconductivity; photoelectron spectra; Q-factor; quantum dots; tunnelling
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Funding
- EU
- German Ministry of Education and Research
- State of Bavaria
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We demonstrate electrical readout of high quality quantum dot micropillars by means of photocurrent (PC) spectroscopy under resonant excitation. Applying this technique enables a high spectral resolution mapping of the optical mode spectrum of the micropillar revealing quality factors of up to 11 000 for a 3 mu m diameter device. PC spectroscopy also shows that the contacted micropillars can act as light sensors with highly wavelength selective and photon sensitive detection capabilities down to 20 nW incident power. Moreover, bias voltage dependent PC studies provide an effective tool to study the competition between carrier tunneling out of the quantum dots and the radiative recombination.
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