Yamada Keitaro, Okamoto Michitaka, Sakurai Minori, Suenobu Tomoyoshi, Nakayama Ken-Ichi
Department of Material and Life Science, Osaka University 2-1 Yamadaoka Suita Osaka Japan
RSC Adv. 2019 Oct 15;9(57):32940-32945. doi: 10.1039/c9ra06258k.
A reduced graphene oxide (rGO) film is first applied to a surface template layer to control the molecular orientation of crystalline organic semiconductors. The ultrathin and ultrasmooth rGO layer was successfully prepared on a substrate without a transfer process by spin-coating a carefully purified GO aqueous dispersion. This rGO layer exhibited a strong templating effect rivaling monolayer graphene, inducing a face-on orientation of copper phthalocyanine molecules leading to significant improvement of vertical carrier mobilities. The highly-conductive and transparent rGO film does not hamper charge transport at the interface and photoabsorption unlike conventional templating materials. This method can be widely used for vertical organic devices that require high carrier mobilities and strong photoabsorption/emission.
首先将还原氧化石墨烯（rGO）薄膜应用于表面模板层，以控制结晶有机半导体的分子取向。通过旋涂精心纯化的氧化石墨烯水分散体，在无需转移过程的基板上成功制备了超薄且超光滑的rGO层。该rGO层表现出与单层石墨烯相当的强模板效应，诱导酞菁铜分子的面取向，从而显著提高垂直载流子迁移率。与传统模板材料不同，高导电性和透明的rGO薄膜不会妨碍界面处的电荷传输和光吸收。该方法可广泛用于需要高载流子迁移率和强光吸收/发射的垂直有机器件。
