Isoindigo-based polymer photovoltaics: modifying polymer molecular structures to control the nanostructural packing motif. Issue 27 (21st June 2016)

• Record Type: Journal Article
• Authors: Kim, Yu Jin; Lee, Yun-Ji; Kim, Yun-Hi; Park, Chan Eon
• Is Part Of: Physical chemistry chemical physics. Volume 18:Issue 27(2016)
• Page Start: 17957
• Page End: 17964
• Publication Date: 2016-06-21
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c6cp03273g
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : A series of isoindigo-based polymers within the framework of a 3D crystalline motif were systematically investigated. Abstract : Donor molecular structures, and their packing aspects in donor:acceptor active blends, play a crucial role in the photovoltaic performance of polymer solar cells. We systematically investigated a series of isoindigo-based donor polymers within the framework of a three-dimensional (3D) crystalline motif by modifying their chemical structures, thereby affecting device performances. Although our isoindigo-based polymer series contained polymers that differed only by their alkyl side chains and/or donating units, they showed quite different nanoscale morphological properties, which resulted in significantly different device efficiencies. Notably, blends of our isoindigo-based donor polymer systems with an acceptor compound, whereby the blends had more intermixed network morphologies and stronger face-on orientations of the polymer crystallites, provided better-performing photovoltaic devices. This behavior was analyzed using atomic force microscopy (AFM) and two-dimensional grazing incidence wide angle X-ray diffraction (2D-GIWAXD). To the best of our knowledge, no correlation has been reported previously between 3D nano-structural donor crystallites and device performances, particularly for isoindigo-based polymer systems.