Photocurrent multiplication phenomenon at organic/organic heterojunction and application to optical computing device combining with organic electroluminescence

Photocurrent multiplication reaching 3000-fold was newly observed at an organic/organic heterojunction between p-type phthalocyanine and n-type perylene pigment layers. Multiplied photocurrent caused upon the irradiation of red light exciting CuPc was effectively suppressed by irradiating blue light exciting Me-PTC simultaneously. A rudimentary optical computing device was successfully demonstrated combining organic electroluminescence with this organic heterojunction device.