Design Of High Efficiency Organic Solar Cells Based On Two-Dimensional Arrayed Dielectric Nanospheres
2016 PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS)(2016)
Abstract
We theoretically demonstrate a convex-concave organic solar cell based on two-dimensional arrayed silica (SiO 2 ) dielectric nanospheres loaded above the indium tin oxide (ITO) substrate, which can bring efficient light trapping in the active layer. In simulation, the PEDOT: PSS (buffer) and the PSBTBT:PC 71 BM (active) layers are conformal to that of the SiO 2 nanospheres, i.e., in the convex-concave shape. Fig. 1 shows that the absorption efficiency of light in the active layer increases over the whole wavelength range from 400 to 900nm when SiO 2 nanospheres with the diameter of 120nm are adopted, by comparison with that of the equivalent planar device (control). It also reflects that the enhancement factor of absorption for the patterned device with respect to the control is especially high at the edge of the absorption band of the active blend (e.g., around 100% at 820 nm). The integrated absorption efficiency of light in the active layer at normal incidence is up to 76.6%, increased by 21.6% as compared with that of the control (63.0%). Detailed investigations reveal that the excitation of photonic modes (i.e., the hybridization of cavity modes and Bloch modes) and plasmonic modes are responsible for the observed enhancement in absorption. In practice, SiO 2 nanospheres achieved with the low-cost solution process can form periodical array through the self-assembly method. The upper functional layers of the solar cells can then be structured conformably by the spin-coating process and thermal evaporation process. Experimentally, this proposal could also lengthen the interface between the active layer and the buffer layer, thereby favoring the charge collection. Compared with metal nanoparticles, the introduced dielectric nanospheres donu0027t suffer from the ohmic loss. This design contributes to the development of low cost solar cell devices.
MoreTranslated text
Key words
high efficiency organic solar cell design,two-dimensional arrayed dielectric nanospheres,convex-concave organic solar cell,two-dimensional arrayed silica dielectric nanospheres,light trapping,active layer,PEDOT:PSS,PSBTBT:PC71BM,light absorption efficiency,equivalent planar device,absorption enhancement factor,photonic mode excitation,plasmonic modes,self-assembly method,upper functional layers,spin-coating process,thermal evaporation process,buffer layer,ohmic loss,active blend,method,wavelength 400 nm to 900 nm,size 120 nm,SiO2,ITO
AI Read Science
Must-Reading Tree
Example
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined