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Title: Improved Crystalline Structure and Enhanced Photoluminescence of ZnO Nanolayers in Bi2Se3/ZnO Heterostructures

Journal Article · · Journal of Physical Chemistry. C
 [1]; ORCiD logo [1];  [2];  [3];  [3]; ORCiD logo [3]; ORCiD logo [4];  [5];  [5]; ORCiD logo [1]
  1. Univ. of Latvia, Riga (Latvia)
  2. Univ. of Latvia, Riga (Latvia); Sumy State Univ. (Ukraine)
  3. Univ. of Montpellier, (France)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Kaunas Univ. of Technology (Lithuania)
+ Show Author Affiliations

The Bi2Se3/ZnO heterostructure is a new combination of high- and low-band-gap nanomaterials that can be implemented for optoelectronic devices. The influence of the Bi2Se3 substrate on crystallization of ZnO nanolayers and charge separation at the Bi2Se3/ZnO interface reflects these important parameters, which affect optical and electronic properties of the heterostructure. Despite a few studies on Bi2Se3/ZnO heterostructures, the mechanisms of enhanced optical properties and correlation between optical and structural properties in such heterostructures are not studied in detail. In the present paper, we report on structure and optical properties of ZnO nanolayers with different thicknesses (10–150 nm) deposited by atomic layer deposition on planar and nonplanar Bi2Se3 nanostructured coatings. Crystallization of ZnO nanolayers grown on Bi2Se3 and Si substrates was analyzed by X-ray diffraction and scanning and transmission electron microscopy methods. Enhancement of ZnO photoluminescence in Bi2Se3/ZnO heterostructures in comparison to the photoluminescence of ZnO nanolayers of the same thickness deposited on p-doped Si substrates was observed. Correlation between the structure and optical properties of ZnO nanolayers in Bi2Se3/ZnO heterostructures is analyzed. Three complementary mechanisms of enhancement of optical properties of ZnO in Bi2Se3/ZnO heterostructures, based on charge separation at the Bi2Se3/ZnO interface, improvement of ZnO crystalline structure, and surface-plasmon–photon coupling, are proposed. The Bi2Se3/ZnO heterostructure is a new combination of high- and low-band-gap nanomaterials that can be implemented for optoelectronic devices. The influence of the Bi2Se3 substrate on crystallization of ZnO nanolayers and charge separation at the Bi2Se3/ZnO interface reflects these important parameters, which affect optical and electronic properties of the heterostructure. Despite a few studies on Bi2Se3/ZnO heterostructures, the mechanisms of enhanced optical properties and correlation between optical and structural properties in such heterostructures are not studied in detail. In the present paper, we report on structure and optical properties of ZnO nanolayers with different thicknesses (10–150 nm) deposited by atomic layer deposition on planar and nonplanar Bi2Se3 nanostructured coatings. Crystallization of ZnO nanolayers grown on Bi2Se3 and Si substrates was analyzed by X-ray diffraction and scanning and transmission electron microscopy methods. Enhancement of ZnO photoluminescence in Bi2Se3/ZnO heterostructures in comparison to the photoluminescence of ZnO nanolayers of the same thickness deposited on p-doped Si substrates was observed. Correlation between the structure and optical properties of ZnO nanolayers in Bi2Se3/ZnO heterostructures is analyzed. Finally, three complementary mechanisms of enhancement of optical properties of ZnO in Bi2Se3/ZnO heterostructures, based on charge separation at the Bi2Se3/ZnO interface, improvement of ZnO crystalline structure, and surface-plasmon–photon coupling, are proposed.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES)
Grant/Contract Number:
89233218CNA000001; 778157-CanBioSe
OSTI ID:
1822743
Report Number(s):
LA-UR-19-32523
Journal Information:
Journal of Physical Chemistry. C, Vol. 123, Issue 51; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE
material science
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heterostructures