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Title: Improving the layer morphology of solution-processed perylene diimide organic solar cells with the use of a polymeric interlayer
Authors: Singh, Ranbir 
Mróz, Marta M. 
Fonzo, Fabio Di 
Cabanillas-Gonzalez, Juan 
Marchi, Enrico 
Bergamini, Giacomo 
Müllen, Klaus 
Jacob, Josemon 
Keivanidis, Panagiotis E. 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: power conversion efficiency (PCE);organic photovoltaic (OPV)
Issue Date: 7-Oct-2013
Source: Organic Photonics and Photovoltaics, 2013, vol. 1, no. 1, pp. 24-38
Volume: 1
Issue: 1
Start page: 24
End page: 38
Journal: Organic Photonics and Photovoltaics 
Abstract: Herein we demonstrate a method to improve the power conversion efficiency (PCE) parameter of organic photovoltaic (OPV) devices based on the electron acceptor N,N’-bis(1- ethylpropyl)-perylene-3,4,9,10-tetracarboxylic diimide (PDI) blended with the electron donor poly(indenofluorene)-aryloctyl (PIF-Aryl). The device parameters of the short-circuit current, open-circuit voltage and fill factor are found increased after the insertion of a thin poly [9, 9-dioctylfluorene-co-N- [4-(3-methylpropyl)]-diphenylamine] (TFB) photoactive interlayer between the hole-collecting electrode and the photoactive layer of the device. Unlike to most of the cases where interlayers serve as charge extractors, in our system the polymeric interlayer serves as a morphology modifying agent that drives the PDI component to segregate better at the interface with the device cathode; that is at the carrier-collecting electrode interface, which is not in physical contact with the interlayer. The processes of energy/charge transfer of the TFB excitons to/with the PIF-Aryl:PDI top-layer are also addressed. Charge transfer reactions dominate at the TFB/PIF-Aryl:PDI interface but no significant contribution in the photocurrent generation is seen in the photoaction spectra of the bilayer device.
ISSN: 2299-3177
DOI: 10.2478/oph-2013-0003
Rights: © Versita
Type: Article
Affiliation : Fondazione Istituto Italiano di Tecnologia 
Instituto Madrileno de Estudios Avanzados en Nanociencia 
University of Bologna 
Max Planck Institute for Polymer Research 
Indian Institute of Technology Delhi 
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