Band‐Like Charge Transport in Phytic Acid‐Doped Polyaniline Thin Films
Marco Ballabio, Tao Zhang, Chen Chen, Peng Zhang, Zhongquan Liao, Mike Hambsch, Stefan C. B. Mannsfeld, Ehrenfried Zschech, Henning Sirringhaus, Xinliang Feng, Mischa Bonn, Renhao Dong⧫, Enrique Cánovas
Abstract
Abstract We explore the charge transport properties of phytic acid (PA) doped polyaniline thin films prepared by the surfactant monolayer‐assisted interfacial synthesis (SMAIS). Structural and elemental analysis confirms the inclusion of PA in the thin films and reveals a progressive loss of crystallinity with the increase of PA doping content. Charge transport properties are interrogated by time‐resolved terahertz (THz) spectroscopy. Notably, independently of doping content and hence crystallinity, the frequency‐resolved complex conductivity spectra in the THz region can be properly described by the Drude model, demonstrating band‐like charge transport in the samples and state‐of‐the‐art charge carrier mobilities of ≈1 cm 2 V −1 s −1 . A temperature‐dependent analysis for the conductivity further supports band‐like charge transport and suggest that charge carrier mobility is primarily limited by impurity scattering. This work highlights the potential of PA doped polyaniline for organic electronics.