“…In addition, we recently reported on the synthesis of boron and nitrogen doped multi-walled carbon nanotubes, and the assembly of OSCs using doped nanotubes [16][17][18]. Multi-walled carbon nanotubes (MWCNTs) may improve the performance of organic solar cells by enhancing electron-hole dissociation [2,8,19], improving the mobility of charge carriers by providing highly conductive pathways [17,[20][21][22], and may enhance the environmental stability of OSCs [16,17,22]. However, one of the main challenges with incorporating MWCNTs in OSCs is the random orientation of the nanotubes within the overall assembly.…”