Energy level alignments at poly[N-9′′-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] on metal and polymer interfaces

► The electronic energy levels of PCDTBT on Au and PCDTBT on PEDOT:PSS substrates are described. ► The vacuum level shift shows a difference depending on the metal and organic substrates. ► The energy level relaxation of PCDTBT interfaces occurs both for the metal and the organic substrates.