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Proceedings Paper

Ring-protected small molecules for organic photovoltaics
Author(s): Jianyuan Sun; Lianjie Zhang; Ashishi Dubey; Swaminathan Venkatesan; Ting-Yu Lin; Logan P. Sanow; Yu-Chueh Hung; Andrew Sykes; Hongshan He; Qiquan Qiao; Cheng Zhang
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Paper Abstract

Recently, excellent solar cell device performances have been achieved with solution-processed small-molecule donor materials. Small molecules have well defined structures and thus allow better control of self-assembly in the solid state. However, the easy formation of H-type aggregates and lack of strong interactions between nanodomains could limit charge transport, device performance, and long-term stability. We have recently explored the synthesis of ring-protected small molecules (with rings surrounding the center of the molecules), studied the intermolecular interactions in solution and solid state, and conducted preliminary solar cell device fabrications. It has been found that the molecules behave very differently from conventional flat small molecules in both solution and solid states. Proton NMR study of solutions of different concentrations revealed the presence of strong intermolecular interactions as a result of absence or shortage of open-ended alkyl side chains; however, such strong interactions do not lead to precipitation of the molecules even at high concentrations. Excellent films are routinely obtained from the neat small molecules despite the much reduced number of solubilizing groups. The New findings strongly suggest that ring protection is an effective strategy to avoid Haggregation and maintain strong pi-pi interactions simultaneously. Such materials are expected to form head-tail selfassemblies that will open new possibilities for small molecule organic materials. Conceptually, thin films of such materials are potentially more isotropic in charge transport than conventional small molecule and polymer films, a property desirable for photovoltaics and some other optoelectronic applications.

Paper Details

Date Published: 17 October 2013
PDF: 10 pages
Proc. SPIE 8830, Organic Photovoltaics XIV, 88302L (17 October 2013); doi: 10.1117/12.2025762
Show Author Affiliations
Jianyuan Sun, South Dakota State Univ. (United States)
Lianjie Zhang, South Dakota State Univ. (United States)
Ashishi Dubey, South Dakota State Univ. (United States)
Swaminathan Venkatesan, South Dakota State Univ. (United States)
Ting-Yu Lin, National Tsing Hua Univ. (Taiwan)
Logan P. Sanow, South Dakota State Univ. (United States)
Yu-Chueh Hung, National Tsing Hua Univ. (Taiwan)
Andrew Sykes, Univ. of South Dakota (United States)
Hongshan He, Eastern Illinois Univ. (United States)
Qiquan Qiao, South Dakota State Univ. (United States)
Cheng Zhang, South Dakota State Univ. (United States)

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

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