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

摘要

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_4TCNQ, C_(60)F_(36), HATCN, and Mo(tfd)_3. The power conversion efficiencies of the OPVs with F_4TCNQ, 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_4TCNQ-doped BPh-BTBT.