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Real-Time Investigation of Intercalation and Structure Evolution in Printed Polymer:Fullerene Bulk Heterojunction Thin Films

Kassar, T; Gueldal, NS; Berlinghof, M; Ameri, T; Kratzer, A; Schroeder, BC; Li Destri, G; ... Unruh, T; + view all (2016) Real-Time Investigation of Intercalation and Structure Evolution in Printed Polymer:Fullerene Bulk Heterojunction Thin Films. Advanced Energy Materials , 6 (5) 10.1002/aenm.201502025. Green open access

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Abstract

The complex intermixing morphology is critical for the performance of the nanostructured polymer:fullerene bulk heterojunction (BHJ) solar cells. Here, time resolved in situ grazing incidence X‐ray diffraction and grazing incidence small angle X‐ray scattering are used to track the structure formation of BHJ thin films formed from the donor polymer poly(2,5‐bis(3‐hexadecylthiophen‐2‐yl)thieno[3,2‐b]thiophene) with different fullerene derivative acceptors. The formation of stable bimolecular crystals through the intercalation of fullerene molecules between the side chains of polymer crystallites is investigated. Such systems exhibit more efficient exciton dissociation but lower photo‐conductance and faster decay of charges. On the basis of the experimental observations, intercalation obviously takes place before or with the formation of the crystalline polymer domains. It results in more stable structures whose volume remains constant upon further drying. Three distinct periods of drying are observed and the formation of unidimensional fullerene channels along the π‐stacking direction of polymer crystallites is confirmed.

Type: Article
Title: Real-Time Investigation of Intercalation and Structure Evolution in Printed Polymer:Fullerene Bulk Heterojunction Thin Films
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/aenm.201502025
Publisher version: http://dx.doi.org/10.1002/aenm.201502025
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Technology, Chemistry, Physical, Energy & Fuels, Materials Science, Multidisciplinary, Physics, Applied, Physics, Condensed Matter, Chemistry, Materials Science, Physics, fullerenes, grazing incidence diffraction, intercalation dynamics, organic solar cells, thin films, SOLAR-CELLS, MOLECULAR PACKING, ORGANIC PHOTOVOLTAICS, BIMOLECULAR CRYSTALS, RECOMBINATION, DEVICES, MISCIBILITY, FULLERENES, MORPHOLOGY, SCATTERING
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10048693
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