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タイトル: | Intermixed Donor/Acceptor Region in Conjugated Polymer Blends Visualized by Conductive Atomic Force Microscopy |
著者: | Osaka, Miki Benten, Hiroaki Ohkita, Hideo https://orcid.org/0000-0002-7403-3492 (unconfirmed) Ito, Shinzaburo |
著者名の別形: | 尾坂, 美樹 辨天, 宏明 大北, 英生 伊藤, 紳三郎 |
発行日: | 15-Feb-2017 |
出版者: | American Chemical Society (ACS) |
誌名: | Macromolecules |
巻: | 50 |
号: | 4 |
開始ページ: | 1618 |
終了ページ: | 1625 |
抄録: | The charge-transport characteristics of phase-separated blend films of poly(3-hexylthiophene) (P3HT; electron donor) and poly[2, 7-(9, 9-didodecylfluorene)-alt-5, 5-(4′, 7′-bis(2-thienyl)-2′, 1′, 3′-benzothiadiazole)] (PF12TBT; electron acceptor) were visualized by conductive atomic force microscopy (C-AFM). The C-AFM hole-current images clearly showed two phases: an electrically conductive region assigned to the P3HT-rich donor domain and a nonconductive region assigned to the PF12TBT-rich acceptor domain. The hole current in the conductive region was small compared with that of a neat P3HT film with similar thickness, indicating that the P3HT-rich domain contained a large fraction of PF12TBT as a minor component. Thermal annealing initially increased the hole current throughout the P3HT-rich domain because of reorganization of the P3HT chains from their as-cast configurations. Further annealing increased the hole current mainly in the middle of the P3HT-rich domain, but it decreased the hole current in the boundary areas close to the PF12TBT-rich domain owing to the presence of an intermixed region with a gradient of the P3HT/PF12TBT composition ratio. After annealing at temperatures above the glass-transition point of PF12TBT, the widths of the intermixed regions decreased to ∼30 nm as phase separation proceeded with decomposition of the intermixed region. Such variations in the intermixed region, which were electrically resolved by the C-AFM, accounted for the temperature dependence of the photovoltaic properties of P3HT/PF12TBT blend solar cells. |
著作権等: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in 'Macromolecules', copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://doi.org/10.1021/acs.macromol.6b02604. The full-text file will be made open to the public on 15 February 2017 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/218964 |
DOI(出版社版): | 10.1021/acs.macromol.6b02604 |
出現コレクション: | 学術雑誌掲載論文等 |
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