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Title: Controlling the Morphology and Efficiency of Hybrid ZnO:Polythiophene Solar Cells Via Side Chain Functionalization
Authors: Oosterhout, Stefan D.
Koster, L. Jan Anton
van Bavel, Svetlana S.
Loos, Joachim
Stenzel, Ole
Thiedmann, Ralf
Schmidt, Volker
CAMPO, Bert 
CLEIJ, Thomas 
LUTSEN, Laurence 
Wienk, Martijn M.
Janssen, Rene A. J.
Issue Date: 2011
Source: ADVANCED ENERGY MATERIALS, 1(1). p. 90-96
Abstract: The efficiency of polymer - metal oxide hybrid solar cells depends critically on the intimacy of mixing of the two semiconductors. The effect of side chain functionalization on the morphology and performance of conjugated polymer:ZnO solar cells is investigated. Using an ester-functionalized side chain poly(3-hexylthiophene-2,5-diyl) derivative (P3HT-E), the nanoscale morphology of ZnO:polymer solar cells is significantly more intimately mixed compared to ZnO:poly(3-hexylthiophene-2,5-diyl) (ZnO:P3HT), as evidenced experimentally from a 3D reconstruction of the phase separation using electron tomography. Photoinduced absorption reveals nearly quantitative charge generation for the ZnO:P3HT-E blend but not for ZnO:P3HT, consistent with the results obtained from solving the 3D diffusion equation for excitons formed in the polymer within the two experimental ZnO morphologies. For thin ZnO:P3HT-E active layers (similar to 50 nm) this yields a significant improvement of the solar cell performance. For thicker cells, however, the reduced hole mobility and a reduced percolation of ZnO pathways hinders charge carrier collection, limiting the power conversion efficiency.
Notes: [van Bavel, Svetlana S.; Loos, Joachim; Janssen, Rene A. J.] Eindhoven Univ Technol, Lab Mat & Interface Chem & Soft Matter, CryoTEM Res Unit, NL-5600 MB Eindhoven, Netherlands. [Stenzel, Ole; Thiedmann, Ralf; Schmidt, Volker] Univ Ulm, Inst Stochast, D-89069 Ulm, Germany. [Campo, Bert; Cleij, Thomas J.; Lutzen, Laurence; Vanderzande, Dirk] Hasselt Univ, Inst Mat Res, BE-3590 Diepenbeek, Belgium.
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ISSN: 1614-6832
e-ISSN: 1614-6840
DOI: 10.1002/aenm.201000022
ISI #: 000291725000010
Category: A1
Type: Journal Contribution
Validations: ecoom 2012
Appears in Collections:Research publications

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