Fullerene (C60) samples purified to seven-nine level by single-crystal formed sublimation were incorporated into i-layer
of p-i-n organic solar cells. Fill factor hardly decreased even for the very thick C60: metal-free phthalocyanine (H2Pc)
codeposited i-interlayer reaching 1.2 µm. For 1 µm thick i-layer, short-circuit photocurrent density of 18.3 mAcm-2 and
photo-electric conversion efficiency of 5.3% was observed. Very large photocurrent density is mainly due to nearly
100% utilization of solar light in the visible region by 1 µm-thick i-layer.
Narrow beamed light emission was successfully obtained in a new type of organic electroluminescent (EL) diode whose organic layer was sandwiched between two metal layers acting as charge injecting electrodes and mirrors. EL from the organic film edge showed much sharper spectrum with a peak depending on the thickness of the organic layer and about 100 times larger emission density compared with that from the film surface of a conventional EL diode.
A new type of light transducer consisting of an organic electroluminescent (EL) diode on a photoconductive amorphous silicon carbide (a-SiC:H) film has been successfully designed, which performs efficient light up-conversion from red to green with quantum conversion of 1% with the assistance of newly observed photocurrent multiplication in a-SiC:H film. EL output under red light irradiation can be modulated by superimposing UV light.