Interface-controlled pulsed-laser deposited polymer films in organic devices

Matrix assisted pulsed laser evaporation (MAPLE) allows homogeneous film coverage of organic materials for layer-by-layer growth providing a tighter control of the polymer–dielectric interface in field-effect transistors (FETs) and metal–insulator–semiconductor (MIS) diodes. Electrical characteristics of FETs and MIS diodes using MAPLE and spin-coated grown fluorene copolymer films are compared. Current–voltage characteristics of MAPLE grown FETs without any surface modification show a better performance compared to the spin-coated FETs. Capacitance–voltage and conductance–voltage investigations of the MIS structures show that loss as well as accumulation capacitance and time constant dispersions are less in the MAPLE grown film compared to the spin-coated film.