Cathode buffer layers based on vacuum and solution deposited poly(3,4-ethylenedioxythiophene) for efficient inverted organic solar cells

Publication Type:

Journal Article

Source:

Appl. Phys. Lett., AIP Publishing, Volume 100, Issue 18, p.183301 (2012)

ISBN:

0003-6951

Keywords:

2012, 2013 and earlier

Abstract:

Vacuum and solution processed versions of poly(3,4-ethylenedioxythiophene) (PEDOT) are used as cathode interlayers in inverted organic photovoltaic
cells comprising tetraphenyldibenzoperiflanthene as the electron donor and
C60 as the electron acceptor. Chemical treatment of the as-deposited PEDOT
layers with tetrakis(dimethylamino)ethylene or cesium carbonate reduces
the work function by up to 0.8 eV. Inserting these PEDOT layers at the
indium tin oxide cathode results in improved electron collection and
efficiencies of up to 2.3 ± 0.2%, approaching the 3.2 ± 0.3% of the
conventional device. This illustrates the potential for efficient
polymercathode materials and inverted device architectures compatible with
either solution or vacuum processing.