Thin-film heterostructures based on conducting polymers and organic semiconductors

摘要

We have carried out the experimental verification of a possibility to produceudorganic heterostructures by using films of organic semiconductors (OS) which areudphotosensitive in a wide spectral region, absorb light, and generate charge carriers in theudregion of transparency of films of conducting polymers – electrochemically synthesizedudpolyaniline (PAN) and poly-3,4-ethylenedioxythiophene (PEDOT) stabilized byudpolystyrenesulfone acid (PSS). As components for the fabrication of theseudheterostuctures, we chose photosensitive organic semiconductors of the n-type, N,N`-uddimethyl-3,4,9,10-perylenetetracarboxydiimide (МРР), and of the р-type, pentaceneud(Pn), which were thermally sprayed on thin layers of PAN and PEDOT. Theudphotovoltage of heterostuctures produced at the temperature of substrates 370 K isudseveral times greater than that of components, reaches its maximum in the region ofudstrong light absorption in OS layers, but is one order less in the region of strongudabsorption in polymers. This testifies to the appearance of an internal electric field nearudthe polymer/OS boundary which enhances the efficiency of separation of photogeneratedudcharge carriers, whereas the efficiency inherent to photogeneration of carriers in theudlayers with PAN and PEDOT-PSS is insufficient yet.