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Abstract This paper reports the effect of ferric chloride (FeCl 3 ) sensitization on poly (2,6 (4,8 bis (5(2ethylhexylthio)4fluorothiophen2yl)benzo[1,2b:4,5b’dithiophene))-alt-(5,5-(1’,3’-di-2-thienyl-5’,7’-bis(2-ethylhexyl)benzo1’,2’c:4’,5’c’dithiophene4,8 dione)] (known as PBDB-T-SF) in thin films (93 nm thickness), spin coated onto glass and ITO substrates. The optical properties do not undergo significant changes after FeCl 3 immersion. Instead, FeCl 3 sensitization leads to a dramatic decrease in resistivity of seven orders of magnitude comparing to the pristine thin films. This change is not stable over time, depending on FeCl 3 solution concentration and polymer thin-film thickness, but remains remarkable after a new immersion.
Hrostea et al. (Mon,) studied this question.
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