Light emitting “polymer-nanoparticles” coatings on macroporous silicon substrates

Authors

  • L. A. Karachevtseva Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences of Ukraine
  • M. T. Kartel Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
  • K. P. Konin Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences of Ukraine
  • O. O. Lytvynenko Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences of Ukraine
  • V. F. Onyshchenko Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences of Ukraine
  • Wang Bo Ningbo University of Technology

DOI:

https://doi.org/10.15407/hftp08.01.018

Keywords:

macroporous silicon substrates, polyethyleneimine, CdS nanocrystals, multiwall carbon nanotubes

Abstract

We investigate the conditions for increase of the photoluminescence of CdS nanocrystals in polyethyleneimine and polyethyleneimine with carbon multiwall nanotubes on macroporous silicon substrates. Macroporous silicon structures are made using the photoelectrochemical etching of n?Si wafers. Macropores with diameter Dp = 2?5 mm, depth hp = 40?120 mm and concentration Np = (1?6)?106 cm?2 were formed. CdS nanocrystals of 1.8–2 nm in size are synthesized in reaction between Cd2+ and HS- in a colloidal solution of polyethyleneimine in water. Carbon multiwall high purity nanotubes with submicron length and 20 nm diameter were produced by catalytic pyrolysis of unsaturated hydrocarbons. “Polymer-nanoparticles” coatings are deposited from a colloidal solution in water on single crystalline silicon, macroporous silicon and oxidized macroporous silicon. The maximal photoluminescence intensity of CdS nanocrystals is measured for the oxidized macroporous silicon substrates with maximal electric field strength at the Si-SiO2 interface. The photoluminescence quantum yield of CdS nanocrystals on the surface of oxidized macroporous silicon increases with timeand reaches 28 %. Photoluminescence of polyethyleneimine with carbon multiwall nanotubes on macroporous silicon with microporous layer is 3–6 times more intense as compared with substrates c-Si, macroporous Si and oxidized macroporous Si due to a non-radiative proton recombination decrease at the silicon matrix boundary with microporous layer and nanocoating.

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(1)
Karachevtseva, L. A.; Kartel, M. T.; Konin, K. P.; Lytvynenko, O. O.; Onyshchenko, V. F.; Bo, W. Light Emitting “polymer-nanoparticles” Coatings on Macroporous Silicon Substrates. Him. Fiz. Tehnol. Poverhni 2017, 8, 18-29.

Issue

Vol. 8 No. 1 (2017): Chemistry, Physics and Technology of Surface / Himia, Fizika ta Tehnologia Poverhni

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