Fig. 2: Comparison of charge transport in Spiro-OMeTAD films based on conventional and 5D doping strategies.
From: Self-cleaning Spiro-OMeTAD via multimetal doping for perovskite photovoltaics
a Ultraviolet-visible absorption spectra of spiro-OMeTAD solutions employing both conventional and 5D doping strategies, with an insect displaying photograph of the solutions. b The evolution of electrical conductivity (σ) over aging time for spiro-OMeTAD films prepared using conventional versus 5D doping. c Space charge limited current (SCLC) hole mobilities measured in hole-only devices (ITO/PEDOT:PSS/spiro-OMeTAD/Au) for both doping strategies. KPFM surface topography images of spiro-OMeTAD films/ITO samples based on conventional (d) and 5D doping (e). Conductive atomic force microscopy (CAFM) current maps of spiro-OMeTAD films/ITO samples based on conventional (f) and 5D doping (g). h Photoluminescence (PL) intensity of perovskite/glass samples with spiro-OMeTAD for both doping methods. i Time-resolved photoluminescence (TRPL) measurements of perovskite/glass samples with spiro-OMeTAD utilizing conventional and 5D doping strategies.
