Extracting carrier mobility using a photoinduced charge transfer reaction: From conducting polymers to nanocarbon materials

Abstract Charge-carrier mobility is an important and crucial performance criterion for organic semiconductors and nanocarbon materials such as carbon nanotubes (CNTs). Although high conductivity has been achieved in highly doped organic semiconductors and CNT networks, reliable measurements of charge-carrier mobility in such disordered materials remain a challenge. Here, we developed and extended a new mobility measurement method, referred to as photoinduced charge transfer, from conducting polymers to nanocarbon materials. We apply this method to examine the carrier mobility of graphene, where the carrier mobility can be extracted using a Hall-effect measurement. By comparing the mobility values obtained using these two methods, we can understand the potential errors in the mobility values extracted using photoinduced dedoping reactions. We further extend this approach to disordered CNT networks and determine the relationship among CNT structure, defects, and carrier mobility.