Fig. 1
From: Tuning charge transport dynamics via clustering of doping in organic semiconductor thin films
Schematic of doping and de-doping of conjugated polymers using iodine. a poly(3-hexylthiophene) P3HT and b 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) are chemically doped in the presence of iodine vapor, but are unstable and gradually de-dope in the absence of iodine vapor
