Charge transport in phthalocyanine thin-film transistors coupled with Fabry-Perot cavities

Strong light-matter coupling can form hybrid states at new energy levels that share properties of both light and matter. This principle offers new routes to control material functions without modifying the chemical structure of molecules. In this work, we coupled ambipolar semiconducting thin films to a Fabry-Perot cavity and investigated effects on charge transport. By constructing thin-film transistors inside optical cavities, we could simultaneously study coupling features and charge transport in the same samples. The cavity resonance was detuned by controlling the thickness of the top spacer layer in the cavity. We found no significant influence on charge transport for our systems, which may be related to insufficiently strong coupling. Possible additional origins and future directions are also discussed. Funding Agencies|Wenner-Gren Foundations; Swedish Research CouncilSwedish Research CouncilEuropean Commission [621-2014-5599]; Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research; AForsk foundation; National Research Foundation of Korea (NRF)National Research Foundation of Korea; Korea government (MSIT)Korean Government [2020R1A2C1102558]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]