Effect of Oxygen on Electrical Properties of Lead Phthalocyanine

Yasunaga, Hitoshi; Kojima, Kenji; Yohda, H.; Takeya, Kenichi

doi:10.1143/jpsj.37.1024

Cited by 53 publications

(15 citation statements)

References 7 publications

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“…The increase in conductance of MPcs when exposed to humidity and or oxygen atmosphere has been reported by other researchers and has been explored for sensing applications. ,− The effects of oxygen adsorption or p-type dopant, in general, on the energy levels of doped CuPc molecule are well studied using photoemission studies . However, several arguments have been reported concerning the interaction of MPcs with water molecules such as a p-dopant or a Lewis base .…”

Section: Resultsmentioning

confidence: 94%

Nanoscale Conductance in Lead Phthalocyanine Thin Films: Influence of Molecular Packing and Humidity

Madhuri

Kaur²,

Ali³

et al. 2017

J. Phys. Chem. C

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The influence of crystalline phase and disorder on vertical charge transport in nonplanar metallophthalocyanines is studied by depositing thin films of shuttlecock molecules, lead phthalocyanine (PbPc), and SnPc on various substrates such as highly oriented pyrolytic graphite (HOPG), silicon, and gold and investigating the structural and electrical characteristics of the films. The films represent three cases of crystalline packing such as monoclinic, triclinic, and disordered phases, directed by the substrate−molecule interactions and intermolecular interactions. Theoretical calculations are performed to understand the molecular orientations on the substrate and give insights into the possible origin of ordered and disordered packing. Vertical charge transport in the films is studied by employing conducting atomic force microscopy and compared with bulk electrical measurements. It is revealed that the monoclinic phase of PbPc on HOPG exhibits two orders of magnitude higher conductance than silicon or gold and is related to the ordered stacking of the macrocycles through which the charge transport is facilitated. Local conductance mapping reveals inhomogeneity among conducting domains and is correlated with the grain structure. The charge transport is best fitted with tunneling mechanism for nanoscale and space-charge-limited current for bulk measurements. The presence of humidity is also shown to influence the nanoscale charge transport with enhanced conductance. Under saturating humidity conditions, the conductance is found to decrease. This study emphasizes the implication of graphite or graphite-like platforms that promote the ordered stacking of delocalized molecular systems for enhanced vertical charge transport.

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Section: Resultsmentioning

confidence: 94%

Nanoscale Conductance in Lead Phthalocyanine Thin Films: Influence of Molecular Packing and Humidity

Madhuri

Kaur²,

Ali³

et al. 2017

J. Phys. Chem. C

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“…This mobility increase is typical, as it is generally accepted that the oxygen in air coordinates with surface MPc metal centres, acting as an electron acceptor/trap and increasing positive charge carrier density in the bulk lm. [32][33][34] Fig . 2b and c shows how m H changes with V GS at various temperatures under different environmental conditions.…”

Section: Alclpc Otftsmentioning

confidence: 99%

Metal phthalocyanine organic thin-film transistors: changes in electrical performance and stability in response to temperature and environment

et al. 2019

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“…0567-7408/82/030766-05501.00 PbPc(T) is only about 10 -~° Sm -~ (Yasunaga, Kojima, Yohda & Takeya, 1974) while that of PbPc(M) is about 10 -2 Sm -~ (Ukei, 1975b). We have investigated the near-infrared and visible reflectance spectra of the two crystal forms and found a significant difference between them.…”

Section: Introductionmentioning

confidence: 99%

Structure of lead phthalocyanine (triclinic form)

Iyechika¹,

Yakushi²,

Ikemoto³

et al. 1982

Acta Crystallogr Sect B

135

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The crystal structure of the triclinic form of lead phthalocyanine has been determined. The crystal data are: C32HI6NsPb, M r = 719.7, Pi, a = 13.123 (7) The final R value is 0.059 for 7683 reflections. Two independent molecular columns exist in this crystal, but they have almost equivalent structures. The molecules are considerably distorted from C4v symmetry. The central Pb atom significantly deviates from the convex side of the phthalocyanine skeleton, and this deviation is larger than that in the monoclinic form of lead phthalocyanine. Molecules are stacked along the a axis and oriented so that their convex sides alternate. They are considerably inclined with respect to the stacking axis.

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Effect of Oxygen on Electrical Properties of Lead Phthalocyanine

Cited by 53 publications

References 7 publications

Nanoscale Conductance in Lead Phthalocyanine Thin Films: Influence of Molecular Packing and Humidity

Nanoscale Conductance in Lead Phthalocyanine Thin Films: Influence of Molecular Packing and Humidity

Metal phthalocyanine organic thin-film transistors: changes in electrical performance and stability in response to temperature and environment

Structure of lead phthalocyanine (triclinic form)

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