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Mechanism of charge generation and photovoltaic effects in lead phthalocyanine based Schottky barrier

Sharma G. D., Choudhary V. S., Janu Y., Roy M. S.

Materials Science Poland

2007

Vol. 25, No. 4

1173--1191

Photovoltaic properties of lead phtalocyanine (PbPc) thin films sandwiched between indium tin oxide (ITO) and aluminum electrodes (ITO/PbPc/Al) have been investigated. The J-V characteristics of the device reveals that current flow across the device is limited by hole injection at Al/PbPc below 300 K, wherein Al is kept at higher bias. Junction parameters such as built-in potential (Vbi), carrier concentration (Na), the width of depletion layer (W) were evaluated from the C-V measurements. The mechanism of transport of carriers in Al/PbPc/ITO has been investigated based on the detailed analysis of current- voltage characteristics at various temperatures in the dark. The PbPc form hole injection barriers with both Al and ITO electrodes which are 0.88 eV and 0.11 eV, respectively, indicating the formation of nearly Ohmic contact with ITO and the Schottky barrier with Al. The photovoltaic parameters of the device have been estimated from the analysis of the current-voltage characteristics under illumination and discussed in detail. Electrically active defects were investigated by the space charge capacitance spectroscopy methods at various temperatures (from 250 K to 350 K) and frequencies (from 5 Hz to 1 MHz), respectively. The activation energy calculated from the capacitance spectroscopy at various temperatures is about 0.32 eV suggesting that the defects originate from the trapping centres at Al/PbPc interface.

Sensor Properties of Bilayer Structures with Palladium, Lead and Cobalt Phthalocyanines in Surface Acoustic Wave and Electric Systems

Jakubik W.

Molecular and Quantum Acoustics

2004

Vol. 25

141-152

Presented here are the results concerning a hydrogen sensor based on a novel bilayer structure with lead and cobalt phthalocyanines in a Surface Acoustic Wave dual-delay line and electric systems. The sensor material consists of two layers produced in two different vapour deposition processes. The first one is a lead or cobalt phthalocyanine (~310nm PbPc or 200nm CoPc) layer, whereas the second is a ~20 nm thin palladium (Pd) film. This structure was simultaneously formed in a one of the SAW dual delay lines and on the interdigital electrodes of the glass substrate for electric measurements. These sensor structures have been investigated from the point of view their sensitivity towards: hydrogen, nitrogen dioxide and sulphur dioxide gases with different concentrations in dry air. Preliminary measurements of this two bilayer structures have been performed simultaneously in the same chamber for this same measurement conditions.

Examination of Thin Films of Phthalocyanineas from the Point of View of Their Application in N02 Sensors

Maciak E., Opilski Z., Pustelny T., Ignac-Nowicka J.

Molecular and Quantum Acoustics

2002

Vol. 23

253-269

In the group of new sensory meterials, phthalocyanineas posses very attractive physical and chemical properties. For some years, phtalocyanineas are investigated for applying in acoustic as well as in optic gas sensors. This work analyzes the possibility of using the surface plasmon resonance system for lead phthalocyjanineas investigations for NO2 sensor applications.