Details

Autor(en) / Beteiligte

• Joe, Sung-yoon
• Ryu, Shinyoung
• Nguyen, Duc Cuong
• Yim, Jong Hyuk
• Jeong, Huiseong
• Ha, Na Young
• Ahn, Y.H.
• Park, Ji-yong
• Lee, Soonil

Titel

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

Ist Teil von

• Organic electronics, 2017-03, Vol.42, p.372-378

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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. [Display omitted] •Use of P3HT nanowires in inverted-type solar cells improved efficiency by 47.1%.•P3HT nanowire inclusion brought changes in vertical inhomogeneity of BHJ layers.•BHJ layer inhomogeneity was quantified based on effective medium approximation.•FDTD simulations were used to identify and exclude parasitic absorption effects.