Presentation Information
[24a-1BC-8]Doping Control Using a Photoinduced Charge Transfer Reaction: From Conducting Polymers to Nanocarbon Materials
〇(D)YUQING WANG1,2, Masatou Ishihara1, Kazuhiro Kirihara1, Shohei Horike3, Qingshuo Wei1,2 (1.AIST, 2.Univ. Tsukuba, 3.Kobe Univ.)
Keywords:
Organic semiconductor,Doping,Nanocarbon
Accurate control of doping in organic semiconductors and nanocarbons is pivotal for diverse device applications in materials science. We pioneered a solid-state photoinduced charge-transfer reaction leveraging the photobase generator (PBG) 2-(9-oxoxanthen-2-yl)propionic acid 1,5,7-triazabicyclo[4.4.0]dec-5-ene to dedope highly conductive polyelectrolyte complexes like poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate. Tailoring UV-irradiation durations precisely modulates carrier density within the film over three orders of magnitude. This precision arises from the formation of the potent base 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) from PBG during UV irradiation, enabling electron transfer to polymers. Extracting carrier mobility akin to thin-film transistor operation in depletion mode becomes feasible by combining charge transfer quantification and conductivity change. This strategy successfully characterizes various conductivities in a benchmark conducting polymer PEDOT/PSS and nanocarbon materials. Recently, we expanded this approach to fabricate n-type graphene.