Ultrafast third-order nonlinear optical properties of self-assembled PCPDTPhSO₃Na/C₇₀-(EDA)₈ periodically overlapping film

A set of ultrathin multilayer films with alternated layers containing Poly[4,4-bis(4-sulfobutyl)-4H-cyclopenta[2,1-b:3,4-b′]dithiophene-2,6-diyl]-1,4-phenylene sodium sa (PCPDTPhSO3Na) as donor and amine group modified fullerene derivative C70-(ethylenediamine)8 (C70-(EDA)8) as acceptor were prepared using layer-by-layer assembly technique on a quartz substrate. Driven by the electrostatic force, C70-(EDA)8 and PCPDTPhSO3Na were alternately...