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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/16386

Title: Enhanced intrinsic stability of the bulk heterojunction active layer blend of polymer solar cells by varying the polymer side chain pattern
Authors: KESTERS, Jurgen
KUDRET, Suleyman
BERTHO, Sabine
Van den Brande, Niko
Defour, Maxime
Van Mele, Bruno
PENXTEN, Huguette
LUTSEN, Laurence
MAES, Wouter
Issue Date: 2014
Citation: ORGANIC ELECTRONICS, 15 (2), p. 549-562
Abstract: Organic photovoltaics (OPVs) have acquired huge attention over the past years as potential renewable energy sources, adding attractive features such as aesthetics, semitransparency, flexibility, large area printability, improved low-light performance, and cost-effectiveness to the well-known Si-based photovoltaics. Steady improvements in OPV power conversion efficiencies are continuously reported, notably for bulk heterojunction solar cells based on conjugated polymer:fullerene blends. However, apart from efficiency and cost, the stability of organic solar cell devices is of particular concern. Among the different factors contributing to OPV instability, gradual loss of the optimum phaseseparated nanomorphology of the photoactive layer blend is a critical parameter. In this paper, we present the results of ‘shelf-life’ accelerated lifetime tests performed for devices containing a range of functionalized poly(3-alkylthiophene) (P3AT) donor polymers upon prolonged thermal stress. By the incorporation of functional moieties on the side chains of P3HT-based copolymers, a remarkable improvement of the intrinsic stability of the active layer blend morphology is accomplished, even for fairly low built-in ratios (5–15%) and without crosslinking to covalently anchor the polymer and/or fullerene molecules. Moreover, these alterations do not influence the initial power conversion efficiencies to a large extent. As such, the presented approach can be regarded as an attractive paradigm for OPV active layer stability.
URI: http://hdl.handle.net/1942/16386
DOI: 10.1016/j.orgel.2013.12.006
ISI #: 000329974500027
ISSN: 1566-1199
Category: A1
Type: Journal Contribution
Validation: ecoom, 2015
Appears in Collections: Research publications

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