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oai:recercat.cat:2117/1129492026-02-04T02:06:41Zcom_2072_1033col_2072_452950

Pentacene thin-films obtained by thermal evaporation in high vacuum Puigdollers i González, Joaquim Voz Sánchez, Cristóbal Orpella García, Alberto Martín García, Isidro Vetter, Michael Alcubilla González, Ramón Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica Universitat Politècnica de Catalunya. MNT - Grup de Recerca en Micro i Nanotecnologies Àrees temàtiques de la UPC::Enginyeria electrònica::Components electrònics::Díodes Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers Thin films Silicon diodes Pentacene Polymer Doping Diodes Capes fines Díodes de silici Pentacene thin-films were obtained by thermal evaporation in high vacuum of a pure (98%) commercially available source. All the samples were grown at room temperature (25 °C) and high deposition rates (>20 Å/s) on Corning glass substrates. The microstructure of the pentacene thin-films evidences the coexistence of thin-film and bulk triclinic crystalline phases. The optical absorption edge close to 1.7 eV, together with the high optical absorption in the visible range, make pentacene a promising candidate for low cost solar cells. Doping series of samples were obtained by dipping pieces cut from the same pentacene sample into a solution of iodine in acetonitrile for different times (<1 h). Thereby, room temperature dark conductivity changes from 3×10-7 to 4×10-5 O-1 cm-1. Finally, glass/SnO/pentacene/Al and glass/ZnO:Al/pentacene/Au structures were fabricated showing rectifying characteristics with on/off ratios of approximately 3 orders of magnitude. Peer Reviewed Postprint (published version) 2003-03 Article Puigdollers, J., Voz, C., Orpella, A., Martin, I., Vetter, M., Alcubilla, R. Pentacene thin-films obtained by thermal evaporation in high vacuum. "Thin solid films", Març 2003, vol. 427, núm. 1-2, p. 367-370. 0040-6090 https://hdl.handle.net/2117/112949 10.1016/S0040-6090(02)01238-5 eng https://www.sciencedirect.com/science/article/pii/S0040609002012385 Restricted access - publisher's policy 4 p. application/pdf