Description Application PBDB-T-SF is a fluorinated wide-bandgap polymeric donor (n-type semiconductor) with relatively deep highest occupied molecular orbital (HOMO) energy level. It has been used in high performance polymer organic solar cells (PSCs). HOMO =−5.40eV LUMO =−3.60eV Polymer organic solar cells (PSCs) device performance: Device based on PBDB-T-SF:NCBDT-4Cl Before any post-treatment PCE= of 13.1% After device optimizations Voc = 0.85V Jsc = 2.35 mA /cm2 FF = 74.3% PCE >14% Energy loss = 0.55 eV The improved performance was attributed to the more efficient photo-electron conversion process in the optimal device. Device performance based on PBDB-T-SF:ITIC-F as active layer (ITO)/ZnO/active layer/MoO3/Al Voc = 0.88 V Jsc = 20.50 mA/cm2 FF = 71.9% PCE = 13.1% Energy loss = 0.66 eV