Chemical Sensitization for Electric Properties Improvement of PBDB-T-SF Polymer for Solar Cells Application
Résumé
This paper reports the effect of ferric chloride (FeCl3) sensitization on poly [(2,6 (4,8 bis (5(2ethylhexylthio)4fluorothiophen2yl)benzo[1,2b:4,5b']dithiophene))-alt-(5,5-(1',3'-di-2thienyl-5',7'-bis(2-ethylhexyl)benzo[1',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 FeCl3 immersion. Instead, FeCl3 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 FeCl3 solution concentration and polymer thin-film thickness, but remains remarkable after a new immersion.