期刊
CHEMISTRY OF MATERIALS
卷 31, 期 13, 页码 4629-4638出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b04605
关键词
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资金
- National Research Foundation of Korea (NRF) - Korea government [NRF-2018R1A2A1A05078791]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20163030013900]
In this study, we obtained a new structural insight into the charge-transporting properties in TPD-based polymers that cannot be solely explained in terms of the type of orientation. We synthesized two types of copolymers comprising mono-TPD or bis-TPD as the accepting unit. Although the planarity and energy levels are similar with the mono-TPD unit, the aggregation state is quite different, and the X-aggregation tendency seems to be stronger when the bis-TPD unit is incorporated. In the case of TPD1, an effective pi-pi orbital overlap is found to originate from the H-ggregates, and 3D charge transport pathways are formed with a bimodal orientation of edge-on and face-on, resulting in an efficient charge transportation (1.84 cm(2).V-1.-s(-1) of hole and 0.31 cm(2).V-1.-s(-1) of electron). In contrast, despite the well-aligned edge-on orientation of TPD2, it exhibited a relatively very low mobility and splitted emission characteristics in photoluminescence spectra because of the tilted intermolecular stacking pattern with an X-shape (0.015 cm(2).V-1.-s(-1) for hole and 0.16 cm(2).V-1.-s(-1) for electron). An overall characterization of the semiconducting polymers was performed, and it was found that the type of aggregation in the final thin films, such as H- or X-aggregation, is indeed important and perhaps more important than the orientation to obtain polymers with a high charge carrier mobility.
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