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Influence of 3D morphology on the performance of all-polymer solar cells processed using environmentally benign nonhalogenated solvents

Title
Influence of 3D morphology on the performance of all-polymer solar cells processed using environmentally benign nonhalogenated solvents
Authors
Jung H.Jung A.-R.Jin S.-M.Kim S.Heo H.Nguyen H.V.T.Kim M.J.Ahn P.Kim M.H.Lee Y.Lee K.-K.Cho J.H.Lee E.Kim B.
Ewha Authors
김명화
SCOPUS Author ID
김명화scopus
Issue Date
2020
Journal Title
Nano Energy
ISSN
2211-2855JCR Link
Citation
Nano Energy vol. 77
Keywords
Active layer morphologyAll-polymer solar cellEnvironmentally benign solvent/additiveMolecular dynamics simulationTEM tomography
Publisher
Elsevier Ltd
Indexed
SCIE; SCOPUS scopus
Document Type
Article
Abstract
Advancing the photovoltaic performance of all-polymer solar cells (APSCs) requires a comprehensive understanding of the dependence of the properties of photoactive blend films on the solvents used to process them. We have studied the correlation between the morphology of PTB7-Th:PNDI2OD-T2 blend films prepared using six different processing solvents. Three-dimensional (3D) transmission electron microscopy tomography (TEMT) revealed the influence of the 3D morphology of the PTB7-Th:PNDI2OD-T2 blend films on their photovoltaic performance. The high-performing toluene (TOL)- and o-xylene (XY)-processed blend films displayed power conversion efficiencies (PCEs) of ~4%, which contained nanoscopically networked fibrous PNDI2OD-T2 polymer domains. The films processed using the other solvents exhibited partly disconnected domains or unfavorable vertical phase separation. In addition, the use of N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), or N-methyl-2-pyrrolidone (NMP) as a solvent additive in XY solution resulted in a substantial improvement in the PCEs to 6.1%. This large enhancement was attributed to the formation of the better-interconnected narrower crystalline fibrillary structure of PNDI2OD-T2 chains with the aid of solvent additives, as clearly elucidated by 3D-TEMT imaging. This work highlights that APSCs processed from benign nonhalogenated solvents with appropriate additives can outperform APSCs processed from toxic halogenated solvents by affording a favorable blend morphology and that 3D TEMT imaging is a powerful and essential tool for characterizing the true morphology of photoactive layers. © 2020 Elsevier Ltd
DOI
10.1016/j.nanoen.2020.105106
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자연과학대학 > 화학·나노과학전공 > Journal papers
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