High-energy exciton transitions in quasi-two-dimensional cadmium chalcogenide nanoplatelets

Vasiliev, R.B.; Lebedev, A.I.; Lazareva, E.P.; Shlenskaya, N.N.; Zaytsev, V.B.; Vitukhnovsky, A.G.; Yuanzhao, Y.; Kazuaki, S.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 24 июня 2017 г.

Авторы: Vasiliev Roman B., Lebedev Alexander I., Lazareva Elizabeth P., Shlenskaya Natalia N., Zaytsev Vladimir B., Vitukhnovsky Alexei G., Yuanzhao Yao, Kazuaki Sakoda
Журнал: Physical Review B
Том: 95
Номер: 16
Год издания: 2017
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: 165414-1
Последняя страница: 165414-7
DOI: 10.1103/PhysRevB.95.165414
Аннотация: Semiconductor nanoparticles of cadmium chalcogenides are known to exhibit pronounced thickness-dependent E0 series of exciton transitions at the Γ point of the Brillouin zone (BZ). In this work, we report an experimental evidence for high-energy series of exciton transitions, which originates from BZ points different from the Γ point, in the family of cadmium chalcogenide quasi-2D nanoplatelets (NPLs). Intensive UV absorption bands demonstrating a pronounced size effect are observed for CdTe, CdSe, and CdS NPLs in addition to the E0 exciton bands in the visible region. These new bands are attributed to transitions analogous to the E1, E1+Δ1, and E2 series observed in bulk crystals. First-principles DFT calculations of the electronic structure and absorption spectra support this explanation and show that the main contribution to these optical transitions comes from X and M points of the 2D BZ, which originate from L and X points of the 3D BZ. At the same time, the E0 series of transitions at the Γ point is well described by the multiband effective-mass model. The observation of the UV exciton bands reveals tunable optical properties of cadmium chalcogenide NPLs in UV spectral region, which may be interesting for practical applications.
Добавил в систему: Васильев Роман Борисович

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High-energy exciton transitions in quasi-two-dimensional cadmium chalcogenide nanoplateletsстатья

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