Characteristic Analysis of Molecular Photodiode Using Conducting Polymer (PANI) as an Electrode

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.

Key Words:

• Polyaniline
• Langmuir-Blodgett film
• Photodiode