
%0 Journal Article
%A Nespurek, S 
%A Hart, RHG 
%A Bonham, JS 
%A Lyons, LE 
%T Photoconduction in Metal-Free Phthalocyanine Films
%J Australian Journal of Chemistry
%D 1985/07/01
%V 38
%N 7
%P 1061-1077
%K 
%R https://doi.org/10.1071/CH9851061
%U https://www.publish.csiro.au/paper/CH9851061 
%X By using pulsed photoconductivity techniques, transient action spectra have been recorded on vacuum-sublimed a metal-free phthalocyanine thin films in the wavelength range 350-700 nm. The transient photocurrents were determined at fields less than 107 V m-1 by range-limited transport of holes, the &#956;T product of photogenerated holes being c. 2&#215;10-14 m2 V-1. The electron &#956;T product was about 100 times smaller. Carrier generation was a bulk phenomenon. The quantum efficiency was about 1-2% at fields up to 107 V m-1, and it was increased several fold by the presence of a layer of the acceptor pyromellitic dianhydride. Photogeneration in phthalocyanine occurred by an Onsager -type process. When pyromellitic  dianhydride was present, an additional process of carrier generation, not of Onsager type, occurred, possibly associated with an exciton reaction with a charge-transfer complex between &#945; metal-free phthalocyanine and pyromellitic dianhydride . 
