2026-04-17T02:51:58Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1133622026-02-11T07:20:15Zcom_2072_1033col_2072_452950

Optoelectronic devices based on evaporated pentacene films Voz Sánchez, Cristóbal Puigdollers i González, Joaquim Martín García, Isidro Muñoz Cervantes, Delfina Orpella García, Alberto Vetter, Michael Alcubilla González, Ramón Àrees temàtiques de la UPC::Energies::Energia solar fotovoltaica::Cèl·lules solars Solar cells Pentacene Schottky diode Excitons Cèl·lules solars Aluminium/pentacene Schottky diodes have been fabricated on glass substrates. An ohmic, transparent front contact was prepared by sputtering a highly conductive indium–tin-oxide layer. The pentacene layer was evaporated in high vacuum of a pure (98%) commercially available source. All the samples were grown at room temperature and moderate deposition rates (<10 Å/s). Optical measurements evidence absorption peaks at energy positions 1.86, 1.97, 2.13, 2.3 and 2.5 eV, corresponding to singlet states of the lowest unoccupied molecular orbital of pentacene. The current–voltage characteristics show good rectifying behaviours. Finally, a clear antibatic response is observed in the external quantum efficiency of the photodiodes when illuminated through the indium–tin-oxide contact. Peer Reviewed Postprint (published version) 2005-01 Article https://www.sciencedirect.com/science/article/pii/S0927024804003745 http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Restricted access - publisher's policy Attribution-NonCommercial-NoDerivs 3.0 Spain