PHOTOVOLTAIC EFFECT IN CUTCNQ ORGANIC THIN-FILMS

An experimental study was carried out of photovoltaic effects occurrin g in the structure Cu/CuTCNQ/ITO(Al). Prototype devices were fabricate d by growing CuTCNQ organic thin films directly on a copper substrate and then laying the semitransparent electrodes (glass/ITO or glass/Al) on the CuTCNQ/Cu. By choosing appropriate conditions for formation of the film in the liquid phase, for example solution temperature, growt h time and so on, we obtained an open-circuit voltage V(OC) as high as 2.6 mV, a short-circuit current density J(SC) of 0.2 muA cm-2, and a fill factor FF of 0.25 for an area of 1.0 cm2 under 0.7 W illumination by a laser wavelength 488 nm. The photovoltaic effect increased when the structural resistance was raised by decreasing the contact pressur e. There were indications that these effects are mainly due to the cha racteristics of the CuTCNQ thin films.