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Title: Phase separation in vacuum codeposited pentacene/6,13-pentacenequinone thin films

Abstract

Pentacene (P) and 6,13-pentacenequinone (PQ) have been vacuum codeposited onto SiO{sub 2} in order to control phase separation in thin films for the application as bulk heterojunctions in organic photovoltaic devices. Structural investigations by means of scanning electron microscopy (SEM) and atomic force microscopy revealed pronounced phase separation of the two materials at length scales that turned out to be tunable by the variation of the deposition rate. X-ray diffraction provided evidence for polymorphism in pure films of P and PQ on SiO{sub 2}. While pure films exhibited both the bulk and thin-film phase, the bulk phase is mainly suppressed within the co-deposited films (P+PQ). This was corroborated by Fourier-transform infrared spectroscopy results. SEM investigations of pure and codeposited films indicated that PQ bulk crystallites of up to 200 nm height form continuous paths to the substrate and grow within a matrix formed of P and PQ thin-film phases. The obtained heterojunction morphologies thus appear interesting for the application in organic-based photovoltaic cells.

Authors:
; ; ; ; ;  [1];  [2]
  1. Institut fuer Physik, Humboldt-Universitaet zu Berlin, Newtonstrasse 15, D-12489 Berlin (Germany)
  2. (Germany)
Publication Date:
OSTI Identifier:
20957826
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 17; Other Information: DOI: 10.1103/PhysRevB.75.174108; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ATOMIC FORCE MICROSCOPY; CRYSTAL STRUCTURE; FOURIER TRANSFORM SPECTROMETERS; FOURIER TRANSFORMATION; HETEROJUNCTIONS; INFRARED SPECTRA; MORPHOLOGY; ORGANIC SEMICONDUCTORS; PENTACENE; PHOTOVOLTAIC CELLS; PHOTOVOLTAIC EFFECT; SCANNING ELECTRON MICROSCOPY; SILICA; SILICON OXIDES; THIN FILMS; VACUUM COATING; X-RAY DIFFRACTION

Citation Formats

Salzmann, Ingo, Opitz, Ricarda, Rogaschewski, Siegfried, Rabe, Juergen P., Koch, Norbert, Nickel, Bert, and Department fuer Physik and CeNS, Ludwig-Maximilians-Universitaet, Geschwister-Scholl-Platz 1, D-80539 Munich. Phase separation in vacuum codeposited pentacene/6,13-pentacenequinone thin films. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.174108.
Salzmann, Ingo, Opitz, Ricarda, Rogaschewski, Siegfried, Rabe, Juergen P., Koch, Norbert, Nickel, Bert, & Department fuer Physik and CeNS, Ludwig-Maximilians-Universitaet, Geschwister-Scholl-Platz 1, D-80539 Munich. Phase separation in vacuum codeposited pentacene/6,13-pentacenequinone thin films. United States. doi:10.1103/PHYSREVB.75.174108.
Salzmann, Ingo, Opitz, Ricarda, Rogaschewski, Siegfried, Rabe, Juergen P., Koch, Norbert, Nickel, Bert, and Department fuer Physik and CeNS, Ludwig-Maximilians-Universitaet, Geschwister-Scholl-Platz 1, D-80539 Munich. Tue . "Phase separation in vacuum codeposited pentacene/6,13-pentacenequinone thin films". United States. doi:10.1103/PHYSREVB.75.174108.
@article{osti_20957826,
title = {Phase separation in vacuum codeposited pentacene/6,13-pentacenequinone thin films},
author = {Salzmann, Ingo and Opitz, Ricarda and Rogaschewski, Siegfried and Rabe, Juergen P. and Koch, Norbert and Nickel, Bert and Department fuer Physik and CeNS, Ludwig-Maximilians-Universitaet, Geschwister-Scholl-Platz 1, D-80539 Munich},
abstractNote = {Pentacene (P) and 6,13-pentacenequinone (PQ) have been vacuum codeposited onto SiO{sub 2} in order to control phase separation in thin films for the application as bulk heterojunctions in organic photovoltaic devices. Structural investigations by means of scanning electron microscopy (SEM) and atomic force microscopy revealed pronounced phase separation of the two materials at length scales that turned out to be tunable by the variation of the deposition rate. X-ray diffraction provided evidence for polymorphism in pure films of P and PQ on SiO{sub 2}. While pure films exhibited both the bulk and thin-film phase, the bulk phase is mainly suppressed within the co-deposited films (P+PQ). This was corroborated by Fourier-transform infrared spectroscopy results. SEM investigations of pure and codeposited films indicated that PQ bulk crystallites of up to 200 nm height form continuous paths to the substrate and grow within a matrix formed of P and PQ thin-film phases. The obtained heterojunction morphologies thus appear interesting for the application in organic-based photovoltaic cells.},
doi = {10.1103/PHYSREVB.75.174108},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 17,
volume = 75,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}