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Fluorinated Polymer Yields High Organic Solar Cell Performance for a Wide Range of Morphologies
Author(s) -
Tumbleston John R.,
Stuart Andrew C.,
Gann Eliot,
You Wei,
Ade Harald
Publication year - 2013
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201300093
Subject(s) - materials science , photocurrent , polymer solar cell , benzotriazole , organic solar cell , yield (engineering) , miscibility , polymer , active layer , heterojunction , absorption (acoustics) , morphology (biology) , solar cell , fullerene , chemical engineering , layer (electronics) , nanotechnology , optoelectronics , composite material , organic chemistry , chemistry , engineering , metallurgy , genetics , thin film transistor , biology
Device performance is recognized to be generally sensitive to morphology in bulk heterojunction solar cells. Through the use of quantitative morphological measurements, it is demonstrated that devices based on benzodithiophene and fluorinated benzotriazole moieties constitute an exception to this design rule and exhibit a range of morphologies that yield similar high performance. In particular, the fill factor (FF) remains above 65% even with factor of two changes in domain size and factor of two changes in relative domain purity. Devices with active layer thicknesses of 250 nm are employed, which are capable of increasing optical absorption to produce high photocurrent. The general insensitivity to both morphology and thickness is likely related to the measured low equilibrium miscibility of fullerene in the polymer of 3‐4%. The materials and processes investigated therefore provide insights into functional material design that yield increased processing latitude and may be more amenable to roll‐to‐roll processing.