Abstract
Microcrystal electron diffraction, grazing incidence wide-angle scattering, and UV-vis spectroscopy were used to determine the unit-cell structure and the relative composition of dimethylated diketopyrrolopyrrole H- and J-polymorphs within thin films subjected to vapor solvent annealing (VSA) for different times. The electronic structure and excited-state deactivation pathways of the different polymorphs were examined by transient absorption spectroscopy, conductive probe atomic force microscopy, and molecular modeling. We find that VSA initially converts amorphous films into mixtures of H- and J-polymorphs and promotes further conversion from H to J with longer VSA times. Though both polymorphs exhibit efficient SF to form coupled triplets, free triplet yields are higher in J-polymorph films compared to mixed films because coupling in J-aggregates is lower and, in turn, more favorable for triplet decoupling.
Original language | English (US) |
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Pages (from-to) | 12207-12213 |
Number of pages | 7 |
Journal | Journal of Physical Chemistry C |
Volume | 125 |
Issue number | 22 |
DOIs | |
State | Published - Jun 10 2021 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- General Energy
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
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CCDC 2060265: Experimental Crystal Structure Determination
Levine, A. M. (Contributor), He, G. (Contributor), Bu, G. (Contributor), Ramos, P. (Contributor), Wu, F. (Contributor), Soliman, A. (Contributor), Serrano, J. (Contributor), Pietraru, D. (Contributor), Chan, C. (Contributor), Batteas, J. D. (Contributor), Kowalczyk, M. (Contributor), Jang, S. J. (Contributor), Nannenga, B. L. (Contributor), Sfeir, M. Y. (Contributor) & Braunschweig, A. B. (Contributor), Cambridge Crystallographic Data Centre, 2021
DOI: 10.5517/ccdc.csd.cc274w5g, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccdc.csd.cc274w5g&sid=DataCite
Dataset
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CCDC 2060264: Experimental Crystal Structure Determination
Levine, A. M. (Contributor), He, G. (Contributor), Bu, G. (Contributor), Ramos, P. (Contributor), Wu, F. (Contributor), Soliman, A. (Contributor), Serrano, J. (Contributor), Pietraru, D. (Contributor), Chan, C. (Contributor), Batteas, J. D. (Contributor), Kowalczyk, M. (Contributor), Jang, S. J. (Contributor), Nannenga, B. L. (Contributor), Sfeir, M. Y. (Contributor) & Braunschweig, A. B. (Contributor), Cambridge Crystallographic Data Centre, 2021
DOI: 10.5517/ccdc.csd.cc274w4f, http://www.ccdc.cam.ac.uk/services/structure_request?id=doi:10.5517/ccdc.csd.cc274w4f&sid=DataCite
Dataset