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(A) J–V characteristics of the PbS CQD solar cells under AM1.5G illumination, forward and reverse scan directions are plotted in order to show the sample hysteresis. PbS treated with three ligands, namely TMAF, TBACl, and EDT are reported as p-type layers. Inset: CQD solar cell structure used in this work. (B) EQE spectra of the same devices reported in A. (C) Device performances of PbS CQDs solar cells with different p-type layers.
