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.
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/12673
Applied Physics Letters
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.
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.