Modification of optical and electrical characteristics of PEDOT:PSS by umbelliferone addition: optical and electrical characterization of umbelliferone doped PEDOT:PSS for photovoltaic applications - Berlim, Leonardo Schneider; Thomazi, Fabiano; Burkarter, Ezequiel; Marino, Cláudia Eliana Bruno; Saul, Cyro Ketzer; Ito, Amando Siuiti; Dartora, Cesar Augusto (Current Nanoscience, 2018)