%A Sung-yoon Joe
%A Shinyoung Ryu
%A Duc Cuong Nguyen
%A Jong Hyuk Yim
%A Huiseong Jeong
%A Na Young Ha
%A Y.H. Ahn
%A Ji-Yong Park
%A Soonil Lee
%J Organic Electronics
%T Contributions of poly(3-hexylthiophene) nanowires to alteration of vertical inhomogeneity of bulk-heterojunction active layers and improvements of light-harvesting and power-conversion efficiency of organic solar cells
%X We report a 47.1% efficiency improvement resulting from the combination of device-architecture modification and inclusion of poly(3-hexylthiophene-2,5-diyl) nanowires (P3HT NWs) in bulk heterojunction (BHJ) active layers (ALs). Modelling of ellipsometry spectra shows substantial changes in inhomogeneity and optical constants of BHJ ALs with P3HT-NW inclusion. Furthermore, finite-difference time-domain simulation results based on actual device structures with inhomogeneous AL models indicate that enhanced light harvesting is a main contributing factor to efficiency improvement. On the contrary, P3HT-NW inclusion has no significant effect on charge carrier collection, other than suppressing occurrence of cul-de-sac in hole-transport pathways and unfavourable indene-C60 bisadduct domains near top anodes.
%P 372-378
%V 42
%D 2017
%R 10.1016/j.orgel.2016.12.063
%I Elsevier B.V.
%L SisLab3146