Abstract
The origin of incident photon to current efficiency (IPCE) of single heterojunction organic photovoltaic devices consisting of copper phthalocyanine (p‐type) and perylene (n‐type) layers has been investigated by means of optical filter effect phenomenon. The p/n type and n/p structure devices were fabricated by sandwiching p/n and n/p layers between two metal ohmic contacts, respectively. Under illumination of white light, the optical filter effect phenomenon was clearly observed, i.e. the contribution of n layer to the exciton generation was observed at 535 nm for the p/n devices, while for the n/p devices the contribution of p layer was stronger, at 635 nm and 700 nm, than that of the n layer. The symbatic like of IPCE action spectra indicate that the exciton dissociation effectively takes place at the p/n interface.
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