Heterojunction photovoltaics using GaAs nanowires and conjugated polymers

Publication Type:

Journal Article

Source:

Nano Lett., ACS Publications, Volume 11, Issue 2, p.408-413 (2011)

ISBN:

1530-6984

Keywords:

2011, 2013 and earlier

Abstract:

We demonstrate an organic/inorganic solar cell architecture based on a blend of poly(3-hexylthiophene) (P3HT) and narrow bandgap GaAs nanowires.
The measured increase of device photocurrent with increased nanowire
loading is correlated with structural ordering within the active layer
that enhances charge transport. Coating the GaAs nanowires with TiO(x)
shells passivates nanowire surface states and further improves the
photovoltaic performance. We find that the P3HT/nanowire cells yield power
conversion efficiencies of 2.36% under white LED illumination for devices
containing 50 wt % of TiO(x)-coated GaAs nanowires. Our results constitute
important progress for the use of nanowires in large area solution
processed hybrid photovoltaic cells and provide insight into the role of
structural ordering in the device performance.