Abstract
Molecular photodiode consisted of an electron acceptor(A), a sensitizer(S) and an electron donor(D) is fabricated by mimicking photo induced electron transfer system in the biological photosynthesis. Polyaniline(PANI)-stearic acid(SA) composite LB films used as an electrode was deposited onto hetero-LB films of A/S/D stacked on ITO glass. The PANI-SA composite LB films exhibited high electrical conductivity of 10−1 ∼ 10−2 S/cm upon with HCl or I2 doping Especially, iodine is found to be the most promising dopant, since it gives a remarkable stability for the molecular photodiode system. The rectifying characteristic and photoswitching function of the proposed molecular photodiode is introduced.
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