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Proceedings Paper

Improving the performance of P3HT/PCBM solar cells with squaraine dye
Author(s): Jing-Shun Huang; Tenghooi Goh; Xiaokai Li; Matthew Y. Sfeir; Elizabeth A. Bielinski; Stephanie Tomasulo; Minjoo L. Lee; Nilay Hazari; André D. Taylor
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Paper Abstract

Expanding the spectral absorption breadth and efficiently harvesting excitons are crucial towards creating highly efficient polymer solar cells. Here we describe a strategy to realize broad-band light harvesting in poly(3-hexylthiophene) (P3HT)-based solar cells. We introduce the use of squaraine dye molecules that play a dual role towards improving P3HT-based solar cells. The first benefit is an increase in the spectral absorption in the near infrared region. The second advantage is the collection of excitons close to the interfacial heterojunctions via Förster resonance energy transfer (FRET). Unlike traditional multi-blend systems, where each donor works independently in separate spectral responses, FRET-based systems enable the effective use of multiple donors with significant improvements in light absorption and conversion. Ultrafast transient absorption experiments show that the excitation energy from P3HT can be transferred rapidly (within a few picoseconds) and efficiently (up to 96%) to the squaraine via FRET. As a result, the overall power conversion efficiency is improved. This architecture opens up a new paradigm towards transformative improvements of polymer solar cells.

Paper Details

Date Published: 17 October 2013
PDF: 9 pages
Proc. SPIE 8830, Organic Photovoltaics XIV, 88300U (17 October 2013); doi: 10.1117/12.2023447
Show Author Affiliations
Jing-Shun Huang, Yale Univ. (United States)
Tenghooi Goh, Yale Univ. (United States)
Xiaokai Li, Yale Univ. (United States)
Matthew Y. Sfeir, Brookhaven National Lab. (United States)
Elizabeth A. Bielinski, Yale Univ. (United States)
Stephanie Tomasulo, Yale Univ. (United States)
Minjoo L. Lee, Yale Univ. (United States)
Nilay Hazari, Yale Univ. (United States)
André D. Taylor, Yale Univ. (United States)


Published in SPIE Proceedings Vol. 8830:
Organic Photovoltaics XIV
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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