Directly Transferable, Highly Conductive, and Transparent Sub‐Microfilm of PEDOT:PSS

Poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has emerged as an ideal material for organic electronics due to its high conductivity, flexibility, transparency, and compatibility. However, conventional fabrication methods for PEDOT:PSS sub‐microfilms, like spin‐casting, face limitations including vulnerability and substrate dependency, which hinder large‐scale production and device integration. Here, a simple wet‐transfer technique is presented to fabricate transferable PEDOT:PSS sub‐microfilms with highly conductive (>2000 S cm⁻¹) and outstanding flexibility, as well as investigate the influence of molecular arrangement within PEDOT:PSS sub‐microfilms on their electronic transport properties. This method leverages PEDOT molecular alignment on the initial substrate to ensure film integrity while maintaining flexibility and stability across multiple transfer cycles. Moreover, PEDOT:PSS sub‐microfilms exhibit self‐healing properties, recovering electrical performance after damage during transfer or usage. Lastly, all‐PEDOT:PSS sub‐microfilms‐based organic electrochemical transistors for signal amplification are fabricated, demonstrating high transconductance (≈19.3 mS) at low gate voltage (≈0.20 V), large on/off current ratios (>222.6), and rapid response. This work provides a scalable strategy for integrating PEDOT:PSS into next‐generation multifunctional and flexible devices.