Zero-dimensional excitonic properties of self-organized quantum dots of CdTe grown by molecular beam epitaxy | Zendy

Yoshikazu Terai | Zendy; Shinji Kuroda | Zendy; K. Takita | Zendy; Tsuyoshi Okuno | Zendy; Yasuaki Masumoto | Zendy

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Zero-dimensional excitonic properties of self-organized quantum dots of CdTe grown by molecular beam epitaxy

Author(s) -

Yoshikazu Terai,

Shinji Kuroda,

K. Takita,

Tsuyoshi Okuno,

Yasuaki Masumoto

Publication year - 1998

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.122885

Subject(s) - quantum dot , cadmium telluride photovoltaics , molecular beam epitaxy , photoluminescence , materials science , exciton , optoelectronics , quenching (fluorescence) , epitaxy , condensed matter physics , chemistry , molecular physics , nanotechnology , optics , physics , fluorescence , layer (electronics)

The successful growth of self-organized quantum dots (QDs) of CdTe on ZnTe (100) surface by molecular beam epitaxy is reported. Atomic force microscope measurements on the uncapped samples revealed the formation of CdTe QDs with typical dot diameters of 20 ± 2 nm and heights of 2.7 ± 0.3 nm at 3.5-ML-thick CdTe deposited. The intensity of photoluminescence (PL) from the capped QDs was higher than CdTe/ZnTe single quantum wells (SQWs) by a few orders of magnitude at 4.2 K, and exhibited a thermal quenching with an activation energy of 110 meV, which is about twice as large as those in SQWs. In time-resolved PL measurements, the decay time was almost independent of temperature below 20 K. This is interpreted as due to the zero-dimensional excitonic properties in QDs

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