Photovoltaic effect by vapor-printed polyselenophene

Publication Type:

Journal Article

Source:

Org. Electron., Elsevier, Volume 26, p.55-60 (2015)

ISBN:

1566-1199

Keywords:

2015, Bilayer heterojunction, Chemical vapor deposition, Polymer solar cells, Unsubstituted polyselenophene, Vapor printing

Abstract:

Polyselenophene (PSe) donor layers are successfully integrated into organic photovoltaic devices (OPV) for the first time. Thin, patterned
films of this insoluble semiconductor were fabricated using a vacuum-based
vapor-printing technique, oxidative chemical vapor deposition (oCVD)
combined with in-situ shadow masking. The vapor-printed PSe exhibits a
reduced optical bandgap of 1.76 eV and enhanced photo-responsivity in the
red compared to its sulfur containing analog, polythiophene. These
relative advantages are most likely explained by selenium’s enhanced
electron-donating character compared to sulfur. The HOMO level of PSe was
determined to be at −4.85 eV. The maximum power conversion efficiency
achieved was 0.4% using a bilayer heterojunction device architecture with
C60 as the donor.