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  Efficient organic photovoltaics from soluble discotic liquid crystalline materials

Schmidt-Mende, L., Fechtenkötter, A., Müllen, K., Friend, R. H., & MacKenzie, J. D. (2002). Efficient organic photovoltaics from soluble discotic liquid crystalline materials. Physica E, 14(1-2), 263-267.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-6640-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-6641-6
Genre: Journal Article

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 Creators:
Schmidt-Mende, L., Author
Fechtenkötter, Andreas1, Author              
Müllen, Klaus1, Author              
Friend, R. H., Author
MacKenzie, J. D., Author
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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Free keywords: organic photovoltaics; discotics; liquid crystalline; coronene
 Abstract: Two different types of soluble discotic liquid crystalline materials and a crystalline perylene dye have been used to create, directly from solution, photovoltaic devices which are compared in this work. Self-organisation of the soluble electron-accepting perylene derivative and the soluble liquid crystalline (LC) discotic material which is stable in a LC phase at room temperature (HBC-PhC12) leads to segregated structures optimised for charge separation and transport in photovoltaic device structures. High external quantum efficiencies up to 34% near 490 nm have been reached. The high efficiencies result from efficient photo-induced charge transfer between the materials as well as effective transport of electrons and holes to the cathode and anode through segregated perylene and the discotic peri-hexabenzocoronene p- system. Atomic force microscopy and device characteristics suggest that the driving force for phase separation and surface energy effects during spin coating of the HBC-PhC12:perylene blend result in a spontaneous vertical segregation of the HBC and the perylene normal to the plane of the spun film. This represents a nearly ideal, self-organised structure in which vertical segregation of charge transport layers coexist with a high interfacial area between the two charge transfer components. This vertical segregation has not been observed in the spin-coated blends where the HBC-PhC12 is replaced by HBC- C-8(*). One probable reason for this may be the different phase stability of the LC phase in the HBCs, which leads to different film-forming properties and film morphologies. (C) 2002 Elsevier Science B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2002-04
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: eDoc: 28660
ISI: 000177036300046
 Degree: -

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Title: Physica E
  Alternative Title : Physica E
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 14 (1-2) Sequence Number: - Start / End Page: 263 - 267 Identifier: ISSN: 1386-9477