Synthesis of Type I PbSe/CdSe Dot-on-Plate Heterostructures with Near-Infrared Emission | Zendy

Kali R. Williams | Zendy; Benjamin T. Diroll | Zendy; Nicolas E. Watkins | Zendy; Rui Xue | Zendy; Alexandra Brumberg | Zendy; Robert F. Klie | Zendy; Richard D. Schaller | Zendy

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Synthesis of Type I PbSe/CdSe Dot-on-Plate Heterostructures with Near-Infrared Emission

Author(s) -

Kali R. Williams,

Benjamin T. Diroll,

Nicolas E. Watkins,

Rui Xue,

Alexandra Brumberg,

Robert F. Klie,

Richard D. Schaller

Publication year - 2019

Publication title -

journal of the american chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.115

H-Index - 612

eISSN - 1520-5126

pISSN - 0002-7863

DOI - 10.1021/jacs.8b13794

Subject(s) - quantum dot , photoluminescence , chemistry , exciton , heterojunction , ultrafast laser spectroscopy , optoelectronics , infrared , absorption (acoustics) , spectroscopy , semiconductor , ultrashort pulse , band gap , optics , materials science , condensed matter physics , physics , laser , quantum mechanics

Zero-dimensional PbSe quantum dots are heterogeneously nucleated and grown onto two-dimensional zincblende CdSe nanoplatelets. Electron microscopy shows ad-grown dots predominantly decorate edges and corners of the nanoplatelets. Spectroscopic characterizations relate type I electronic alignment as demonstrated via photoluminescence excitation spectroscopy enhancement of near-infrared emission. Transient photoluminescence and absorption convey ultrafast transfer of excitons to the lower energy semiconductor dots. These structures combine benefits of large absorption cross sections of nanoplatelets and efficient near-infrared emission of PbSe with quantum confinement tuning of energy gap.

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