Nanoscale mobility mapping in semiconducting polymer films
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Local electrical properties of thin films of the polymer PTB7 are studied by conductive atomic force microscopy (C-AFM). Non-uniform nanoscale current distribution in the neat PTB7 film is revealed and connected with the existence of ordered PTB7 crystallites. The shape of local I-V curves is explained by the presence of space charge limited current. We modify an existing semi-empirical model for estimation of the nanoscale hole mobility from our experimental C-AFM measurements. The procedure of nanoscale charge mobility estimation was described and applied to the PTB7 films. The calculated average C-AFM hole mobility is in good agreement with macroscopic values reported for this material. Mapping of nanoscale hole mobility was achieved using the described procedure. Local mobility values, influenced by nanoscale structure, vary more than two times in value and have a root-mean-square value 0.22 × 10−8 m2/(Vs), which is almost 20% from average hole mobility.
Alekseev , A , Yedrissov , A , Hedley , G J , Ibraikulov , O , Heiser , T , Samuel , I D W & Kharintsev , S 2020 , ' Nanoscale mobility mapping in semiconducting polymer films ' , Ultramicroscopy , vol. 218 , 113081 . https://doi.org/10.1016/j.ultramic.2020.113081
Copyright © 2020 Elsevier B.V. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.ultramic.2020.113081
DescriptionThis work was supported by grant No 19-12-00066 of the Russian Science Foundation.
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