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Proceedings Paper

Effect of film nanostructure on in-plane charge transport in organic bulk heterojunction materials
Author(s): Eric Danielson; Zi-En Ooi; Ananth Dodabalapur
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Paper Abstract

Bulk heterojunction (BHJ) organic solar cells are a promising alternative energy technology, but a thorough understanding of charge transport behavior in BHJ materials is necessary in order to design devices with high power conversion efficiencies. Parameters such as carrier mobilities, carrier concentrations, and the recombination coefficient have traditionally been successfully measured using vertical structures similar to organic photovoltaic (OPV) cells. We have developed a lateral BHJ device which complements these vertical techniques by allowing spatially resolved measurement along the transport direction of charge carriers. This is essential for evaluating the effect of nanoscale structure and morphology on these important charge transport parameters. Nanomorphology in organic BHJ films has been controlled using a variety of methods, but the effect of these procedures has been infrequently correlated with the charge transport parameter of the BHJ material. Electron beam lithography has been used to create lateral device structures with many voltage probes at a sub-micron resolution throughout the device channel. By performing in-situ potentiometry, we can calculate both carrier mobilities and determine the effect of solvent choice and annealing procedure on the charge transport in BHJ system. Spin coated P3HT:PCBM films prepared from solutions in chloroform and o-xylene are characterized using this technique.

Paper Details

Date Published: 11 September 2013
PDF: 9 pages
Proc. SPIE 8811, Physical Chemistry of Interfaces and Nanomaterials XII, 88110W (11 September 2013); doi: 10.1117/12.2026547
Show Author Affiliations
Eric Danielson, The Univ. of Texas at Austin (United States)
Zi-En Ooi, A*STAR Institute of Materials Research and Engineering (Singapore)
Ananth Dodabalapur, The Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 8811:
Physical Chemistry of Interfaces and Nanomaterials XII
Natalie Banerji; Carlos Silva, Editor(s)

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