Fig. 6
From: Anatomy of the energetic driving force for charge generation in organic solar cells
Normalized photoluminescence under different bias conditions. a BTA3/J61 with electric field dependence of ηgenA of 50%. The excitation wavelength of 500 nm is indicated by the arrow. b PCBM/J61 with electric field dependence of ηgenD of 11%. The excitation wavelength of 540 nm is indicated by the arrow. The spectra are normalized by the spectrum measured under an applied bias of 0 V. The decrease of the PL intensity for BTA3/J61 (a) with −1.5 V bias indicates that emission from the S1 state decreased with increasing internal electric field. The PL spectra of the pristine films are shown in Supplementary Fig. 15
