Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Session A4: Nanostructures in Polymer-base Photovoltaics |
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Sponsoring Units: DPOLY Chair: Michael Mackay, University of Delaware Room: Ballroom A4 |
Monday, March 21, 2011 8:00AM - 8:36AM |
A4.00001: Multiscale simulation of solar cell morphologies guided by SANS and neutron reflectivity data Invited Speaker: This abstract not available. [Preview Abstract] |
Monday, March 21, 2011 8:36AM - 9:12AM |
A4.00002: Achievements, opportunities and challenges for organic solar cells Invited Speaker: This abstract not available. [Preview Abstract] |
Monday, March 21, 2011 9:12AM - 9:48AM |
A4.00003: Impact of the interfacial nanostructures on the electronic processes in organic solar cells Invited Speaker: After a brief description of the optical and electronic processes that take place in a solid-state organic solar cell [1], we turn our attention to recent theoretical advances regarding the determination of the energetics and dynamics at the organic-organic, donor-acceptor interfaces [2]. We underline the complexity of the processes taking place at the nanoscale [3] and highlight the balance that needs to be found for the optimization of materials parameters in terms of photovoltaic performance. \\[4pt] [1] J.L. Bredas, J. Norton, J. Cornil, and V. Coropceanu, \textit{Acc. Chem. Res.} \textbf{42}, 1691 (2009).\\[0pt] [2] Y.Yi, V. Coropceanu, and J.L. Bredas, \textit{J. Amer. Chem. Soc.} \textbf{131}, 5131 (2009); \textit{ibid}., \textit{J. Mater. Chem.} (2010).\\[0pt] [3] M. Linares \textit{et al.}, \textit{J. Phys. Chem. C} \textbf{114}, 3215 (2010). [Preview Abstract] |
Monday, March 21, 2011 9:48AM - 10:24AM |
A4.00004: Interfacial Aspects of Polymer Based Photovoltaic Structures Invited Speaker: Controlling thin film morphology is key in optimizing the efficiency of polymer-based photovoltaic (PV) devices. Poly(3- hexylthiophene) and [6,6]-penyl-C61 butyric acid methyl ester (P3HT:PCBM) based solar cell performance is dictated by nanostructure of the active layer, the interfaces between the active layer and the electrodes, and the P3HT chain orientation in the thin film. The above parameters were systematically studied by scanning transmission electron microscopy, scanning force microscopy, optical microscopy, grazing incident angle x- ray diffraction., dynamic secondary ion mass spectroscopy and near edge x-ray absorption fine structure analysis. The influence of thermal annealing on the morphology, interfaces and crystal structure was investigated in films that were either initially confined by two electrodes or confined by only one electrode. While the bulk morphology in these films were identical, significant differences in the concentration of components at the electrode interfaces were found, giving rise to a marked difference in performance. In addition, a model was established, based on the crystallization of the P3HTand the diffusion of the PCBM to describe the origins of the nanoscale morphology found in the active layer. The device performance parameters were quantitatively studied. [Preview Abstract] |
Monday, March 21, 2011 10:24AM - 11:00AM |
A4.00005: Morphology control in printable solar cells Invited Speaker: Nanostructured polymer-based solar cells (PSCs) have emerged as a promising low-cost alternative to conventional inorganic photovoltaic devices and are now a subject of intensive research both in academia and industry. For PSCs to become practical efficient devices, several issues should still be addressed, including further understanding of their operation and stability, which in turn are largely determined by the morphological organization in the photoactive layer. The latter is typically a few hundred nanometers thick film and is a blend composed of two materials: the bulk heterojunction consisting of the electron donor and the electron acceptor. The main requirements for morphology of efficient photoactive layers are nanoscale phase segregation for a high donor/acceptor interface area and hence efficient exciton dissociation, short and continuous percolation pathways of both components leading through the layer thickness to the corresponding electrodes for efficient charge transport and collection, and high crystallinity of both donor and acceptor materials for high charge mobility. In this contribution we review recent progress of our understanding on how the efficiency of a bulk-heterojunction PSC largely dependents on the local nanoscale volume organization of the photoactive layer. [Preview Abstract] |
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