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박영석

Park, Young S.
Advanced Organic Materials Lab.
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Photo-Cross-Linkable Azide-Functionalized Polythiophene for Thermally Stable Bulk Heterojunction Solar Cells

Author(s)
Nam, Chang-YongQin, YangPark, Young S.Hlaing, HtayLu, XinhuiOcko, Benjamin M.Black, Charles T.Grubbs, Robert B.
Issued Date
2012-03
DOI
10.1021/ma3001725
URI
https://scholarworks.unist.ac.kr/handle/201301/20044
Fulltext
http://pubs.acs.org/doi/abs/10.1021/ma3001725
Citation
MACROMOLECULES, v.45, no.5, pp.2338 - 2347
Abstract
We have synthesized photo-cross-linkable azide-functionalized poly(3-hexylthiophene) to explore improvements in the thermal stability of bulk heterojunction solar cells. Exposing blends of photo-cross-linkable polythiophene and [6,6]-phenyl-C-61-butyric acid methyl ester to ultraviolet light preferentially cross-linked the polythiophene without degrading its optical or electrical properties. X-ray scattering measurements showed that cross-linking slightly compacted the polythiophene chain lamellar stacking while increasing the polymer crystal coherence length by 20%. Optimized solar cells having cross-linked active blend layers retained 65% of their initial photovoltaic power conversion efficiency after 40 h of thermal annealing at 110 degrees C, while devices using un-cross-linked commercial polythiophene underwent significant phase separation and retained less than 30% of their initial efficiency after annealing
Publisher
AMER CHEMICAL SOC
ISSN
0024-9297
Keyword
POLYMER PHOTOVOLTAIC CELLSORGANIC PHOTOVOLTAICSOPTICAL-PROPERTIESMORPHOLOGYEFFICIENCYSTABILIZATIONPERFORMANCEFILMSLINKINGOXYGEN

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