Fig. 4
From: Tuning charge transport dynamics via clustering of doping in organic semiconductor thin films
Impact of doping on surface potential contrast. A histogram of measured surface potential contrast (SPC) and its Gaussian fit, with the height map and SPC map inset, of a pristine poly(3-hexylthiophene) (P3HT), b pristine poly[2,5-bis(2-octyldodecyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione-3,6-diyl)-alt-(2,2′;5′,2′′;5′′,2′′′-quaterthiophen-5,5′′′-diyl)] (PDPP4T), c P3HT doped at 25 °C, d P3HT doped at 75 °C, e PDPP4T doped at 25 °C, and f PDPP4T doped at 75 °C
