fig6
Figure 6. Electrical characteristics. (A) Cross-sectional KPFM images, (B) CPD profiles, and (C) Jph-Veff curves of control, AA-, ABA-, and DBA-modified devices; (D) PL and (E) TRPL spectra of control, AA-, ABA-, and DBA-modified perovskite films; (F) TPC curves and (G) Mott-Schottky plots for control, AA-, ABA-, and DBA-modified devices. KPFM: Kelvin probe force microscopy; CPD: contact potential difference; AA: L-aspartic acid; ABA: 4-aminobutyric acid; DBA: L-2,4-diaminobutyric acid; PL: photoluminescence; TRPL: time-resolved photoluminescence; TPC: transient photocurrent; ITO: indium tin oxide.
