Photoconduction in Langmuir-Blodgett films of octasubstituted metal-free phthalocyanine molecules

Author

Ray, A.K. ; Nabok, A. ; Hassan, A.K. ; Cook, M.J.

Author_Institution

Sch. of Eng., Sheffield Hallam Univ., UK

Volume

146

Issue

1

fYear

1999

fDate

2/1/1999 12:00:00 AM

Firstpage

44

Lastpage

48

Abstract

In-plane steady-state photoconduction in Langmuir-Blodgett (LB) films of octa-substituted metal-free phthalocyanine molecules have been studied over a temperature range between 78 and 293 K. Deep-level traps localised at grain boundaries of multicrystalline films are believed to be responsible for both dark conduction and photoconduction. Slow and fast relaxation mechanisms are identified from measurements of transient currents. Small changes of substituting chains in the molecule are found to have significant influences on rate and quantum yield of photogeneration of charge carriers in LB films

Keywords

Langmuir-Blodgett films; carrier relaxation time; dark conductivity; deep levels; electron traps; grain boundaries; organic semiconductors; photoconductivity; 78 to 293 K; Langmuir-Blodgett films; dark conduction; deep-level traps; grain boundaries; in-plane steady-state photoconduction; multicrystalline films; octasubstituted metal-free phthalocyanine molecules; photogeneration; quantum yield; relaxation mechanisms; substituting chains; transient currents;

fLanguage

English

Journal_Title

Circuits, Devices and Systems, IEE Proceedings -

Publisher

iet

ISSN

1350-2409

Type

jour

DOI

10.1049/ip-cds:19990268

Filename

762394