The correlation between the optical properties and microstructural parameters of different poly(arylenephenylene) thin films, deposited by spin-coating, is investigated by spectroscopic ellipsometry. Conjugated polymer films are found to be anisotropic. They are birefringent, with a higher refractive index in the plane of the film than perpendicular to it. This anisotropy is due to a preferential in-plane orientation of the polymer chains. The dependence of both the in-plane and out-of-plane optical constants of the polymeric thin films and of the fundamental pi-pi* transition on the structure of the chain backbone are studied. The change of the pi-pi* transition energy of the polymers from solution to thin film and its correlation with the molecular structure are investigated as indicative of interchain interactions.
Study of anisotropic optical properties of poly(arylenephenylene) thin films: Dependence on polymer backbone
BABUDRI, Francesco;FARINOLA, Gianluca Maria;
2003-01-01
Abstract
The correlation between the optical properties and microstructural parameters of different poly(arylenephenylene) thin films, deposited by spin-coating, is investigated by spectroscopic ellipsometry. Conjugated polymer films are found to be anisotropic. They are birefringent, with a higher refractive index in the plane of the film than perpendicular to it. This anisotropy is due to a preferential in-plane orientation of the polymer chains. The dependence of both the in-plane and out-of-plane optical constants of the polymeric thin films and of the fundamental pi-pi* transition on the structure of the chain backbone are studied. The change of the pi-pi* transition energy of the polymers from solution to thin film and its correlation with the molecular structure are investigated as indicative of interchain interactions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
