TCTA 4,4',4''-Tri(9-carbazoyl)triphenylamine CAS: 139092-78-7 Formula: C54H36N4 M.W.: 740.89 TCTA4,4',4''-Tri( ... 9-carbazoyl)triphenylamineCAS: 139092-78-7Formula: C54H36N4M.W.: 740.89 Hole Transport Materials: NPB, TPD ... clients. 4,4',4''-Tri(9-carbazoyl)triphenylamine, TCTA, 139092-78-7