Wang Shu-Jen, Panhans Michel, Lashkov Ilia, Kleemann Hans, Caglieris Federico, Becker-Koch David, Vahland Jörn, Guo Erjuan, Huang Shiyu, Krupskaya Yulia, Vaynzof Yana, Büchner Bernd, Ortmann Frank, Leo Karl
Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Technische Universität Dresden, 01069 Dresden, Germany.
Leibnitz Institute for Solid State and Materials Research, IFW, Helmholtzstraße 20, 01069 Dresden, Germany.
Sci Adv. 2022 Apr;8(13):eabl9264. doi: 10.1126/sciadv.abl9264. Epub 2022 Mar 30.
We investigate the charge and thermoelectric transport in modulation-doped large-area rubrene thin-film crystals with different crystal phases. We show that modulation doping allows achieving superior doping efficiencies even for high doping densities, when conventional bulk doping runs into the reserve regime. Modulation-doped orthorhombic rubrene achieves much improved thermoelectric power factors, exceeding 20 μW m K at 80°C. Theoretical studies give insight into the energy landscape of the heterostructures and its influence on qualitative trends of the Seebeck coefficient. Our results show that modulation doping together with high-mobility crystalline organic semiconductor films is a previosly unexplored strategy for achieving high-performance organic thermoelectrics.
我们研究了具有不同晶相的调制掺杂大面积红荧烯薄膜晶体中的电荷和热电输运。我们表明，当传统的体掺杂进入储备区时，调制掺杂即使对于高掺杂密度也能实现卓越的掺杂效率。调制掺杂的正交晶系红荧烯实现了显著改善的热电功率因子，在80°C时超过20 μW m K 。理论研究深入了解了异质结构的能量态势及其对塞贝克系数定性趋势的影响。我们的结果表明，调制掺杂与高迁移率晶体有机半导体薄膜相结合是实现高性能有机热电材料的一种此前未被探索的策略。
