Morphology, Optical and AC Electrical Properties of Copper Phthalocyanine Thin Films

Abstract

AC electrical properties of sandwich devices composed of thermally evaporated thin lms of copper phthalocyanine (CuPc) with aluminum and gold electrodes (Al/CuPc/Au) are investigated over frequency (f ) range of 10 2 10 5 Hz and temperature range of 293453 K. Morphology of the samples was studied via eld emission scanning electron microscope images and X-ray diraction micrographs. The X-ray diraction micrograph indicates the conguration of α-CuPc with the (510) plane as the preferred orientation. UVVis absorption spectrum was analyzed and the optical band-gap energy of CuPc thin lm was determined to be 2.81 ± 0.01 eV. Capacitance increased with increasing temperature especially for f = 10 2 Hz. Loss factor decreased considerably with increasing frequency to a minimum value at about f = 10 4 Hz and increased afterwards. Capacitance is generally independent of frequency for T ≤ 413 K; however it decreases remarkably with increasing frequency for T > 413 K. The conductivity increases quite noticeably with increasing frequency particularly for T ≤ 413 K. The AC electrical characteristics are in good agreement with Goswami and Goswami model. According to our data, at high temperatures, the band theory is applicable in describing the conduction process, whereas hopping mechanism is dominant at low temperatures.

Orientational and Crystalline Order of Copper–Phthalocyanine Films on Gold: the Role of Substrate Roughness and Cleanliness

“…While CuPc molecules in the first monolayers exhibit a recumbent orientation, an upright orientation was found for subsequent layers, however, without any detailed crystallographic analysis of these films. Similarly, very different molecular orientations have been reported also in other studies for CuPc films on gold substrates, comprising recumbent, standing, , and mixed orientations. − …”

Facile fabrication of multilayer films of graphene oxide/copper phthalocyanine with high dielectric properties

“…S4 †). As for the disordered GO/CuPc composite, the XRD result is the same as that of CuPc, which shows no obvious stacking peaks of GO on the XRD pattern, 32 indicating the successful of the intercalation of CuPc and the complete exfoliation of GO sheets and rapid precipitation in poor solvent hinders the formation of layer-by-layer 3D ordered structure.…”

Enhanced Four‐Electron Selective Oxygen Reduction Reaction at Carbon‐Nanotube‐Supported Sulfonic‐Acid‐Functionalized Copper Phthalocyanine

“…UV‐vis spectra for CuPc‐SO 3 − , MWCNTs‐CuPc‐SO 3 − , and NMWCNTs‐CuPc‐SO 3 − are shown in Supporting Information, Figure S1. They show a single peak in the UV region at 340 nm due to the B band or soret band of CuPc‐SO 3 − [29,30] . They also exhibit a strong doublet band in the visible region at 633 and 670 nm, referred to as the Q band of CuPc‐SO 3 − , originated due to the π–π* transition of the phthalocyanine ring.…”

“…They also exhibit a strong doublet band in the visible region at 633 and 670 nm, referred to as the Q band of CuPc‐SO 3 − , originated due to the π–π* transition of the phthalocyanine ring. The doublet band is due to the contribution of both the aggregated and individual units of CuPc‐SO 3 − [29–34] …”