An out of the box vision over oxidative chemical vapor deposition of PEDOT involving sublimed iron trichloride

Milad Mirabedin (1, 2) , Hugues Vergnes (1) , Nicolas Caussé (2) , Constantin Vahlas (2) , Brigitte Caussat (1)

1 LGC - Laboratoire de Génie Chimique
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Oxidative chemical vapor deposition (oCVD) is an efficient technique to produce highly conductive films of Poly (3,4-ethylenedioxythiophene) (PEDOT). Despite numerous studies on the oCVD of PEDOT films, there is limited information on the stability of the sublimation of solid oxidants and on their impact on the polymerization reactions. In this work, we use an in situ Quartz Crystal Microbalance to monitor film formation over time. Through a series of deposition experiments between 20°C and 100°C and for FeCl 3 /EDOT molar gas ratios between 17.3 and 75.3, we analyze in detail the correlations between process parameters and film morphology, composition, surface topography and electrical conductivity on 10 cm silicon wafers. By using multiple sub-strates at different positions into the reactor, we demonstrate that the formation of PEDOT occurs uniformly through purely surface reactions, following step growth polymerization principles. These results pave the way towards highly conductive oCVD PEDOT films processed from convenient solid oxidants.

Mots clés: oxidative chemical vapor deposition; PEDOT; thin films; FeCl3; conductive polymers

Domaines: Matériaux

Milad Mirabedin, Hugues Vergnes, Nicolas Caussé, Constantin Vahlas, Brigitte Caussat. An out of the box vision over oxidative chemical vapor deposition of PEDOT involving sublimed iron trichloride. Synthetic Metals, 2020, ⟨10.1016/j.synthmet.2020.116419⟩. ⟨hal-02733187⟩