Implication of Structural Disorder in The Charge Transport Properties of Cobalt-phthalocyanine Thin Films

Journal Article · Fri Jul 15 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3606221· OSTI ID:21608119

Debnath, A K; Kumar, A; Samanta, S; Singh, A; Aswal, D K; Gupta, S K; Yakhmi, J V ^[1]

---

1. Technical Physics Division, Bhabha Atomic Research Center, Mumbai 400 085 (India)

The charge transport properties of 100 nm thick cobalt phthalocyanine (CoPc) films grown on single crystal Al{sub 2}O{sub 3}(0001 oriented) and quartz substrates using molecular beam epitaxy, have been investigated as a function of applied bias ({+-} 50 V) at room temperature. Films grown on Al{sub 2}O{sub 3} are highly ordered and exhibited non-hysteretic current-voltage (J-V) characteristics. On the other hand, films grown on quartz substrates are highly disordered and exhibited hysteretic J-V characteristics due to charge trapping. The analysis of J-V characteristics of films on Al{sub 2}O{sub 3} substrates show that the transport is governed by shallow trap mediated space charge limited conduction (SCLC), while for the films grown on the quartz substrate transport is through the exponentially distributed traps mediated SCLC. X-ray photoelectron spectroscopy data show that charge trapping centers in the films grown on quartz substrates are created by chemisorbed oxygen.

• OSTI ID: 21608119
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1349; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHARGE EXCHANGE
CHARGE TRANSPORT
COBALT COMPLEXES
COBALT COMPOUNDS
COMPLEXES
CRYSTAL GROWTH METHODS
CRYSTALS
DYES
ELECTRIC CONDUCTIVITY
ELECTRIC POTENTIAL
ELECTRICAL PROPERTIES
ELECTRON SPECTROSCOPY
EPITAXY
FILMS
HETEROCYCLIC COMPOUNDS
MINERALS
MOLECULAR BEAM EPITAXY
MONOCRYSTALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHTHALOCYANINES
PHYSICAL PROPERTIES
QUARTZ
SPACE CHARGE
SPECTROSCOPY
SUBSTRATES
THIN FILMS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
TRAPPING
X-RAY PHOTOELECTRON SPECTROSCOPY