Dipole reversal in Langmuir–Blodgett films of an optically nonlinear dye and its effect on the polarity for molecular rectification

Ashwell, Geoff and Robinson, Benjamin and Amiri, Mukhtar and Locatelli, Danika and Quici, Silvio and Roberto, Dominique (2005) Dipole reversal in Langmuir–Blodgett films of an optically nonlinear dye and its effect on the polarity for molecular rectification. Journal of Materials Chemistry, 15 (39). pp. 4203-4205. ISSN 0959-9428

Abstract

Langmuir–Blodgett (LB) films of isomeric donor–(π-bridge)–acceptor molecules with either a hydrophobically substituted acceptor [D–π–A–C16H33 (1)] or donor [A–π–D–C16H33 (2)] exhibit second-harmonic generation and asymmetric current–voltage characteristics: a reversed polarity for rectification arises from an inversion of the dipole orientations in the two types of monolayer.