Fig. 2 | npj Flexible Electronics

Fig. 2

From: Large-scale roll-to-roll printed, flexible and stable organic bulk heterojunction photodetector

Fig. 2

a AFM and b TEM images of PBDTT-ffQx/PCBM BHJ thin film. c UV–vis absorption spectra of PBDTT-ffQx (black), PCBM (red), and PBDTT-ffQx/PCBM BHJ (blue) thin films, respectively. d The PL time decay traces of PBDTT-ffQx and PBDTT-ffQx/PCBM BHJ thin films at λPL = 703 nm with the exponential fits (\(y{\mathrm{ = }}y_0 + A{\rm e}^{ - x/\tau }\)), of which the lifetime is 0.21 and 0.40 ns, respectively