[19a-D102-1~10] 12.4 Organic light-emitting devices and organic transistors

▲ [19a-D102-7] Photoinduced Dedoping of Conducting Polymers: An Approach to Precise Control of the Carrier Concentration and Understanding Transport Properties

〇Qingshuo Wei^1,2,3, Masakazu Mukaida^1,2, Takao Ishida^1,2 (1.AIST, 2.OPERANDO-OIL, 3.JST-PRESTO)

Keywords:Organic Semiconductor, Photobase Generator, Carrier Mobility

Exploring the various applications of conjugated polymers requires the systematic studies of their physical properties as a function of doping density, which consequently calls for the precise control of their doping density. In this study, we report a novel solid-state photoinduced charge-transfer reaction that dedopes highly conductive polyelectrolyte complexes poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate. Varying the UV-irradiation time of this material allows the carrier density inside the film to be precisely controlled over more than three orders of magnitude. We extract the carrier density, carrier mobility, and Seebeck coefficient at different doping levels to obtain a clear image of carrier transport mechanisms. This approach not only leads to a better understanding of the physical properties of the conducting polymer but also is useful for developing applications requiring patterned, large-area conducting polymers.