Effect of shell thickness on small-molecule solar cells enhanced by dual plasmonic gold-silica nanorods
Demir, H. V.
Wong, T. K. S.
Kyaw, A. K. K.
Sun, X. W.
Applied Physics Letters
Xu, X., Du, Q., Peng, B., Xiong, Q., Hong, L., Demir, H. V., ... & Sun, X. W. (2014). Effect of shell thickness on small-molecule solar cells enhanced by dual plasmonic gold-silica nanorods. Applied Physics Letters, 105(11), 113306.
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/12673
Chemically synthesized gold (Au)-silica nanorods with shell thickness of 0 nm-10 nm were incorporated into the bulk heterojunction of a small-molecule organic solar cell. At optimal (1 wt. %) concentration, Au-silica nanorods with 5 nm shell thickness resulted in the highest power conversion efficiency of 8.29% with 27% relative enhancement. Finite-difference time-domain simulation shows that the localized electric field intensity at the silica shell-organic layer interface decreases with the increase of shell thickness for both 520 nm and 680 nm resonance peaks. The enhanced haze factor for transmission/reflection of the organic layer is not strongly dependent on the shell thickness. Bare Au nanorods yielded the lowest efficiency of 5.4%. Light intensity dependence measurement of the short-circuit current density shows that the silica shell reduces bimolecular recombination at the Au surface. As a result, both localized field intensity and light scattering are involved in efficiency enhancement for an optimized shell thickness of 5 nm. (C) 2014 AIP Publishing LLC.