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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.
Wienk, Martijn M.
Janssen, Rene A. J.
|Issue Date: ||2011|
|Publisher: ||WILEY PERIODICALS, INC|
|Citation: ||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.
|ISI #: ||000291725000010|
|Type: ||Journal Contribution|
|Validation: ||ecoom, 2012|
|Appears in Collections: ||Research publications|
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