%0 Journal Article
%@ 1566-1199
%A Joe, Sung-yoon
%A Ryu, Shinyoung
%A Nguyen, Duc Cuong
%A Yim, Jong Hyuk
%A Jeong, Huiseong
%A Ha, Na Young
%A Ahn, Y.H.
%A Park, Ji-Yong
%A Lee, Soonil
%D 2017
%F SisLab:3146
%I Elsevier B.V.
%J Organic Electronics
%P 372-378
%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
%U https://eprints.uet.vnu.edu.vn/eprints/id/eprint/3146/
%V 42
%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.