Figure 4. Device performance and characterization.
Current vs. potential (J-V) curves (A), and incident photon-to-charge-carrier-efficiency (IPCE) and IPCE enhancement factor for the devices (B). Nyquist plots of electrochemical impedance spectroscopy at 0.55 V (C) and at open circuit potential (D). 0.4 wt.% of GQDs was incorporated into PEDOT:PSS layer.