Dark and Photoelectric Investigation on Thin Films of β-Cobalt Phthalocyanine Dispersed in Polymers

Abstract

Electrical and photoelectrical measurements are made on thin films of β‐cobalt phthalocyanine particles in Schottky junction cells. The results of current density‐voltage characteristics in dark at constant temperature are interpreted in terms of a space charge limited mechanism dominated by an exponential distribution of trapping levels. An analysis of the results enables the determination of the Fermi temperature of the trap distribution. The dependence of the photovoltaic parameters on pigment loading and polymer binder are investigated. Typical polymeric binders used throughout this study are polyvinylacetate (PVA) and polycarbonate (MK). The results show that the polymer has a strong effect on photocurrent generation efficiency in phthalocyanine composite type photovoltaic cell; polymers having a polar group seem desirable for improving the performance.

Electrical properties and dielectric relaxation of thermally evaporated zinc phthalocyanine thin films

“…In the past three decades, phthalocyanine (Pc) compounds have attracted much attention because they have enormous potential for applications, such as semi conducting devices [1,2], photovoltaic and solar cell [3,4], gas sensors [5,6], and optical recording [7]. Pcs are interesting groups of compounds because their structure corresponds to porphyrine of which chlorophyll is a member and they have chemical and photochemical stability [8,9].…”

AC Conductivity of Cobalt Phthalocyanine

“…Organic semiconductors, like phthalocyanine, have attracted interest due to the low-dimensional nature of their electrical conduction and the current interest in solar energy conversion [1]. Cobalt phthalocyanine, being thermally and chemically stable, has been used as a material interesting from biological and chemical points of view.…”

Determination of conduction parameters of vacuum deposited magnesium phthalocyanine thin films from their electrical, optical studies and application of VRH model

“…3), the values of (E F À E v ) and l p N v have been calculated from the slope and intercept at 1/T = 0. Taking N v = 10 27 m À3 which correspond to one state per molecule [11] and d = 543 nm, the values of (E F À E v ), l p and p 0 are calculated for MgPc. (E F À E v ) and l p are found to be 0.69 ± 0.01 eV and 9.66 · 10 À7 m 2 V À1 s À1 (Error neglected).…”