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Proceedings Paper

A soft lithography route to nanopatterned photovoltaic devices
Author(s): Stuart S. Williams; Meredith J. Hampton; Vignesh Gowrishankar; I-Kang Ding; Lei Zhang; Doo-Hyun Ko; Joseph L. Templeton; Joseph M. DeSimone; Michael D. McGehee; Edward T. Samulski
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Paper Abstract

We have fabricated bulk heterojunction photovoltaic (PV) cells using a perfluoropolyether (PFPE) elastomeric stamp to control the morphology of the donor-acceptor interface within devices. Devices were fabricated using the Pattern Replication In Non-wetting Templates (PRINT) process to have nanoscale control over the bulk heterojunction device architecture. The low-surface energy, chemically resistant, variable modulus, fluoropolymer based molds used in PRINT provide a route to patterning, with nanometer resolution, general polymeric donor materials such as polythiophene and polyphenylenevinylene derivatives and 'hard' inorganic oxide structures typically used as acceptor materials in hybrid organic solar cells such as TiO2, ZnO, and CdSe. This "top-down" approach allows for patterning over large areas and for the functionalization of the donor/acceptor interface. Specifically, nanostructured anatase titania with post-like features ranging from 30-100 nm in diameter and 30-65 nm in height was fabricated to form the ordered bulk heterojunction of a titania-poly(3-hexylthiophene) (P3HT) PV-cell. Nanostructured devices showed a two-fold improvement in both short-circuit current (Jsc) and power conversion efficiency (PCE) relative to reference bilayer cells. Additionally, we will discuss devices fabricated with other organic and inorganic materials in order to investigate the effect on cell performance of controlling the nanoscale architecture of the bulk heterojunction via patterning.

Paper Details

Date Published: 11 September 2008
PDF: 10 pages
Proc. SPIE 7047, Nanoscale Photonic and Cell Technologies for Photovoltaics, 70470I (11 September 2008); doi: 10.1117/12.794853
Show Author Affiliations
Stuart S. Williams, The Univ. of North Carolina at Chapel Hill (United States)
Meredith J. Hampton, The Univ. of North Carolina at Chapel Hill (United States)
Vignesh Gowrishankar, Stanford Univ. (United States)
I-Kang Ding, Stanford Univ. (United States)
Lei Zhang, The Univ. of North Carolina at Chapel Hill (United States)
Doo-Hyun Ko, The Univ. of North Carolina at Chapel Hill (United States)
Joseph L. Templeton, The Univ. of North Carolina at Chapel Hill (United States)
Joseph M. DeSimone, The Univ. of North Carolina at Chapel Hill (United States)
North Carolina State Univ. (United States)
Michael D. McGehee, Stanford Univ. (United States)
Edward T. Samulski, The Univ. of North Carolina at Chapel Hill (United States)


Published in SPIE Proceedings Vol. 7047:
Nanoscale Photonic and Cell Technologies for Photovoltaics
Loucas Tsakalakos, Editor(s)

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