Indium tin oxide (ITO)-free, top-illuminated, flexible perovskite solar cells

Flexible perovskite solar cells have been demonstrated using solution-processed n-doped PC₆₁BM as the electron-transporting layer. The dopant of SDBAC enhances the conductivity of the PC₆₁BM by about 3 orders of magnitude and improves the PCE to 11.8%.