As sandwich type photosensors, Langmuir-Blodgett (LB) film made of
M-tetra-tert -butylphthalocyanine (
M= Cu, VO) is sandwiched between Al electrode and ITO. V-I characteristic and photoresponse were measured by photosensor, also sensors of thermally annealed LB film. The properties of Al/VO-ttbPc/ITO are photocurrent ; 0.22μA/10 mm
2, photo/dark current ratio ; 920, photoresponse (T
r + T
d); 1.0 msec (30layers, Bias voltage ;-1 V). Thermally annealed LB film was almost changeless with energy level, molecular structure and photo/dark current ratio
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