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Optical and Morphological Characterization of PTCDI-C13

Published online by Cambridge University Press:  01 February 2011

Marco Stella ,
Fernando Villar ,
Fredy Enrique Rojas ,
Mónica Della Pirriera ,
Cristobal Voz ,
Joaquim Puigdollers ,
José Miguel Asensi ,
Jordi Andreu  and
Joan Bertomeu
Marco Stella
Affiliation:
marco.stella@ub.edu, Universitat de Barcelona, Física Aplicada i Òptica, Barcelona, 08028, Spain
Fernando Villar
Affiliation:
fernandovillar@ub.edu, Universitat de Barcelona, Física Aplicada i Òptica, Barcelona, 08028, Spain
Fredy Enrique Rojas
Affiliation:
fredyrojas@ub.edu, Universitat de Barcelona, Física Aplicada i Òptica, Barcelona, 08028, Spain
Mónica Della Pirriera
Affiliation:
jpuigdeel@upc.edu, Universitat Politècnica de Catalunya, Enginyeria Electrònica, Barcelona, 08034, Spain
Cristobal Voz
Affiliation:
cvozeel@upc.edu, Universitat Politècnica de Catalunya, Enginyeria Electrònica, Barcelona, 08034, Spain
Joaquim Puigdollers
Affiliation:
jpuigd@eel.upc.es, Universitat Politècnica de Catalunya, Enginyeria Electrònica, Campus Nord, edifici C4, C. Gran Capità, Barcelona, 08034, Spain
José Miguel Asensi
Affiliation:
jmasensi@ub.edu, Universitat de Barcelona, Física Aplicada i Òptica, Barcelona, 08028, Spain
Jordi Andreu
Affiliation:
jordi.andreu@ub.edu, Universitat de Barcelona, Física Aplicada i Òptica, Barcelona, 08028, Spain
Joan Bertomeu
Affiliation:
jbertomeu@ub.edu, Universitat de Barcelona, Física Aplicada i Òptica, Barcelona, 08028, Spain
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Abstract

The organic photovoltaic technology has developed much in the last few years thanks to the optimization of the solar cell geometry and, specially, to the research for new performing materials. Nevertheless, much work has still to be done in order to better know the real mechanisms regulating the function of such novel class of semiconductors. The study of thin-film micro-structure, and the influence of the deposition parameters on it, is an important issue in order to obtain best optical and electrical properties. Thermal evaporation in high-vacuum chambers is the more suitable deposition technique to obtain organic thin-films with well organize molecular structure. Deposition parameters such as the substrate temperature and deposition rate may have some important effect on the molecules ordering. In this paper the effects of substrate temperature on structural and optical properties have been studied for N,N′-ditridecyl perylene diimide (PTCDI-C13) thin-films. Four samples have been deposited at 30, 60, 90 and 120°C substrate temperature and their absorption has been investigated by photothermal deflection spectroscopy (PDS) and transmittance spectroscopy. Moreover, simulations of the transmittance spectra have been calculated in order to obtain the optical constants n and k. Finally atomic force microscopy (AFM) has been employed to analyze the superficial morphology of the thin-films.

Keywords

optical propertiesorganicmorphology
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1091: Symposium AA – Conjugated Organic Materials–Synthesis, Structure, Device and Applications , 2008 , 1091-AA05-40
Copyright
Copyright © Materials Research Society 2008

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