Extended Data Fig. 1: UPS and LE-IPES spectra of IT-4F, IT-4Cl, ITIC, ICC6 and PCBM.
From: Intrinsic efficiency limits in low-bandgap non-fullerene acceptor organic solar cells
UPS and LE-IPES spectra of IT-4F), IT-4Cl, ITIC, ICC6, and PC71BM thin films on evaporated Au100nm/Cr10nm/n-type Si(100). a) SECO region normalized to the SEC peak height and offset with work function (WF) values labelled. b) UPS (left) and LE-IPES (right) spectra displayed with respect to the Fermi level at 0. The intersection between the flat baseline and tangent of the respective frontier orbitals band defines here the HOMO and LUMO level and IE and EA with respect to vacuum. These are identified by black vertical lines and value labeled. The respective vacuum levels are displayed by the vertical lines.
