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Effects of Backbone Planarity and Tightly Packed Alkyl Chains in the Donor-Acceptor Polymers for High Photostability

Title
Effects of Backbone Planarity and Tightly Packed Alkyl Chains in the Donor-Acceptor Polymers for High Photostability
Authors
Lee H.S.Song H.G.Jung H.Kim M.H.Cho C.Lee J.-Y.Park S.Son H.J.Yun H.-J.Kwon S.-K.Kim Y.-H.Kim B.
Ewha Authors
김명화김봉수
SCOPUS Author ID
김명화scopus; 김봉수scopus
Issue Date
2016
Journal Title
Macromolecules
ISSN
0024-9297JCR Link
Citation
vol. 49, no. 20, pp. 7844 - 7856
Publisher
American Chemical Society
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The photostability of donor-acceptor (D-A) polymers remains a critical issue despite recent improvements in the power conversion efficiencies (PCEs) of organic photovoltaic (OPV) cells. We report the synthesis of three highly photostable polymers (PDTBDT-BZ, PDTBDT-BZF, and PDTBDT-BZF2) and their suitability for use in high-performance OPV cells. Under 1 sunlight of illumination in air for 10 h, these polymer films demonstrated remarkably high photostability compared to that of PTB7, a representative polymer in the OPV field. While the PDTBDT-BZ, PDTBDT-BZF, and PDTBDT-BZF2 polymer films maintained 97, 90, and 96% photostability, respectively, a PTB7 film exhibited only 38% photostability under the same conditions. We ascribed the high photostability of the polymers to both the intrinsically photostable chemical moieties and the dense packing of alkyl side chains and planar backbone polymer chains, which prevents oxygen diffusion into the PDTBDT-BZ films. This work demonstrates the high photostability of planar PDTBDT-BZ series polymers composed of photostable DTBDT and BZ moieties and suggests a design rule to synthesize highly photostable photovoltaic materials. © 2016 American Chemical Society.
DOI
10.1021/acs.macromol.6b01580
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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