Diffusion and influence on photovoltaic characteristics of p-type dopants in organic photovoltaics for energy harvesting from blue-light

Abstract To improve the performance of organic photovoltaics (OPV) for energy harvesting from blue-light, the OPVs (Ag/BCP/C 60 /BPh-BTBT/10 mol% p -doped BPh-BTBT/ITO) are fabricated with several dopants such as F 4 TCNQ, C 60 F 36 , HATCN, and Mo(tfd) 3 . The power conversion efficiencies of the OPVs with F 4 TCNQ, C 60 F 36 , HATCN, and Mo(tfd) 3 -doped BPh-BTBT obtained by white light-emitting diode source are improved with 60, 78, 46, and 49% than those by normal solar light, respectively. Secondary ion mass spectroscopy is performed with the 1-day and 7-days samples after the sample fabrication to observe the dopant distributions in each p -doped layer. Diffusion of dopant is observed only in the F 4 TCNQ-doped BPh-BTBT.