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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/15085

Title: Thermally Stable Bulk Heterojunction Solar Cells Based on Cross-Linkable Acrylate-Functionalized Polythiophene Diblock Copolymers
Authors: Ouhib, Farid
Tomassetti, Mirco
Manca, Jean
Piersimoni, Fortunato
Spoltore, Donato
Bertho, Sabine
Moons, Hans
Lazzaroni, Roberto
Desbief, Simon
Jerome, Christine
Detrembleur, Christophe
Issue Date: 2013
Citation: MACROMOLECULES, 46 (3), p. 785-795
Abstract: We report on the synthesis of new thermally cross-linkable all-conjugated diblock copolymers composed of a poly(3-hexylthiophene) (P3HT) block and an acrylate-functionalized polythiophene block. These copolymers are then used in bulk heterojunction (BHJ) solar cells with [6,6]-phenyl C61-butyric acid methyl ester (PCBM), and their photovoltaic performances are compared with standard P3HT/PCBM devices. Thermal cross-linking of the functional copolymers/PCBM blends is performed to improve the thermal stability of the active layer. BHJ photovoltaic cells with cross-linkable copolymers and PCBM show initial power conversion efficiencies slightly lower than that of P3HT devices. However, solar cells with cross-linkable copolymers retain more than 85% of their initial power efficiency value after 165 h of thermal annealing (accelerated aging test), whereas the same devices with P3HT retain less than 65% of their initial power efficiency. This improvement of the thermal stability of BHJ photovoltaic cells is the result of the polymer network that hampers PCBM diffusion and phase separation, as confirmed with TEM and AFM analysis of the microscopic morphology. Such an improvement is mostly observed when using a cross-linkable P3HT with a short spacer between the acrylate group and the polythiophene backbone.
Notes: [Ouhib, Farid; Jerome, Christine; Detrembleur, Christophe] Univ Liege ULg, Dept Chem, CERM, B-4000 Liege, Belgium. [Tomassetti, Mirco; Manca, Jean; Piersimoni, Fortunato; Spoltore, Donato; Bertho, Sabine; Moons, Hans] Univ Hasselt, IMO, Div IMOMEC, B-3590 Diepenbeek, Belgium. [Lazzaroni, Roberto; Desbief, Simon] Univ Mons UMONS, Serv Chim Mat Nouveaux, B-7000 Mons, Belgium.
URI: http://hdl.handle.net/1942/15085
DOI: 10.1021/ma3020905
ISI #: 000315018400026
ISSN: 0024-9297
Category: A1
Type: Journal Contribution
Validation: ecoom, 2014
Appears in Collections: Research publications

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