期刊
NANO LETTERS
卷 15, 期 7, 页码 4483-4487出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00947
关键词
Single quantum dot; two-step photon absorption; intermediate-band solar cell; two-color photoexcitation spectroscopy
类别
资金
- Project for Developing Innovation Systems of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
We present the first direct observation of two-step photon absorption in an InAs/GaAs single quantum dot (QD) using photocurrent spectroscopy with two lasers. The sharp peaks of the photocurrent are shifted due to the quantum confined Stark effect, indicating that the photocurrent from a single QD is obtained. In addition, the intensity of the peaks depends on the power of the secondary laser. These results reveal the direct demonstration of the two-step photon absorption in a single QD. This is an essential result for both the fundamental operation and the realization of ultrahigh solar-electricity energy conversion in quantum dot intermediate-band solar cells.
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