Morphology, Crystal Structure and Charge Transport in Donor鈥揂cceptor Block Copolymer Thin Films
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- 作者：Gaurav Gupta ; Chetan R. Singh ; Ruth H. Lohwasser ; Marcel Himmerlich ; Stefan Krischok ; Peter M眉ller-Buschbaum ; Mukundan Thelakkat ; Harald Hoppe ; Thomas Thurn-Albrecht
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2015
- 出版时间：June 17, 2015
- 年：2015
- 卷：7
- 期：23
- 页码：12309-12318
- 全文大小：638K
- ISSN：1944-8252
文摘
We studied structure and charge transport properties of thin films of donor鈥揳cceptor block copolymers, poly(3-hexylthiophene-block-perylene bisimide acrylate), using a combination of X-ray scattering, AFM and vertical charge transport measurements in diode devices. Block copolymer self-assembly and crystallization of the individual components are interrelated and different structural states of the films could be prepared by varying preparation conditions and thermal history. Generally the well-defined microphase structures found previously in bulk could also be prepared in thin films, in addition alignment induced by interfacial interactions was observed. Microphase separated block copolymers sustain ambipolar charge transport, but the exact values of electron and hole mobilities depend strongly on orientation and connectivity of the microdomains as well as the molecular order within the domains.