Composition-Dependent Charge Transport in Boron Carbides Alloyed with Aromatics

Plasma Enhanced Chemical Vapor Deposition Aniline/Orthocarborane Films

Adeola Oyelade, Andrew J. Yost, Nicole Benker, Bin Dong, Sean Knight, Mathias Schubert, Peter A. Dowben, Jeffry A. Kelber

Research output: Contribution to journalArticle

Abstract

Boron carbide films, alloyed with aniline moieties, were deposited by plasma enhanced chemical vapor deposition (PECVD) from aniline and orthocarborane precursors and were found to exhibit composition-dependent drift carrier lifetimes as derived from I(V) and C(V)) measurements. For a film with an aniline/carborane ratio of 5:1, the effective drift carrier lifetimes are ∼80 μs at low bias voltage but quickly drop to a few microseconds with increasing bias. A film with a 10:1 aniline/carborane ratio, however, exhibited lifetimes of ∼6 μs, or less, at 1 kHz, and much smaller values at 10 kHz. These lifetimes are orders of magnitude longer than those in polyaniline films and comparable to those in PECVD carborane films without aromatic content. X-ray photoelectron spectroscopy (XPS), FTIR, and ellipsometry, combined with density functional theory (DFT)-based cluster calculations, indicate that aniline and orthocarborane moieties are largely intact within the films. Bonding occurs primarily between aniline C sites and carborane B sites, and the aniline coordination number per carborane icosahedron is ∼2 as the aniline/carborane ratio is increased from 3:1 to 10:1. This aniline/carborane coordination ratio independent of aniline/orthocarborane stoichiometry is consistent with the dependence of charge transport properties on aniline film content at high bias voltage.

Original languageEnglish (US)
Pages (from-to)12007-12016
Number of pages10
JournalLangmuir
Volume34
Issue number40
DOIs
StatePublished - Oct 9 2018

Fingerprint

Boron carbide
boron carbides
Aniline
Plasma enhanced chemical vapor deposition
aniline
Charge transfer
carborane
vapor deposition
Chemical analysis
Carrier lifetime
carrier lifetime
Bias voltage
life (durability)
Ellipsometry
electric potential
Polyaniline
coordination number
Stoichiometry
Transport properties
ellipsometry

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Composition-Dependent Charge Transport in Boron Carbides Alloyed with Aromatics : Plasma Enhanced Chemical Vapor Deposition Aniline/Orthocarborane Films. / Oyelade, Adeola; Yost, Andrew J.; Benker, Nicole; Dong, Bin; Knight, Sean; Schubert, Mathias; Dowben, Peter A.; Kelber, Jeffry A.

In: Langmuir, Vol. 34, No. 40, 09.10.2018, p. 12007-12016.

Research output: Contribution to journalArticle

Oyelade, Adeola ; Yost, Andrew J. ; Benker, Nicole ; Dong, Bin ; Knight, Sean ; Schubert, Mathias ; Dowben, Peter A. ; Kelber, Jeffry A. / Composition-Dependent Charge Transport in Boron Carbides Alloyed with Aromatics : Plasma Enhanced Chemical Vapor Deposition Aniline/Orthocarborane Films. In: Langmuir. 2018 ; Vol. 34, No. 40. pp. 12007-12016.
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