83rd CEMS Colloquium


Dr. Keisuke Tajima (Emergent Functional Polymers Research Team, RIKEN CEMS)


17:30 - 18:30, July 29, 2020 (Wednesday)


Okochi-Hall, RIKEN


Look Beyond the Surface: Applications of Surface-segregated Monolayers for Organic Electronics


Structural control of organic semiconductor thin films at the interface and in the bulk is vital for their use in various organic electronic devices. In this talk, I will provide an overview of the formation and functions of surface-segregated monolayers (SSMs) on organic semiconductor films. Driven by the low surface energy of the molecules, SSMs are spontaneously formed through molecular self-organization during spin-coating from solution. Careful design of SSM molecules allows the formation of highly ordered surface monolayers with high coverage densities. SSMs can be used to induce large changes in the packing structures and the molecular orientation in the bulk film, which can be exploited to improve  the bulk properties of films. Film surfaces covered with SSMs can be used to change the interfacial properties of organic/metal and organic/organic interfaces in various organic electronic devices. These modifications can drastically alter the performance of devices, demonstrating the general importance of interfaces. We will discuss directions for further development of SSMs and applications in the field of organic electronic devices.