fig3

Figure 3. (A) PL spectra and (B) TRPL decay curves for the devices with (w/) and without (w/o) PI. (C) The dark current-voltage curves for hole-only devices with (w/) and without (w/o) PI. (D) Nyquist plots of the devices with (w/) and without (w/o) PI, measured in the dark. TRPL: Time-resolved photoluminescence; PI: polyimide; PL: photoluminescence.