1 research outputs found
Intrinsic and Extrinsic Parameters for Controlling the Growth of Organic Single-Crystalline Nanopillars in Photovoltaics
The
most efficient architecture for achieving high donor/acceptor
interfacial area in organic photovoltaics (OPVs) would employ arrays
of vertically interdigitated p- and n- type semiconductor nanopillars
(NPs). Such morphology could have an advantage in bulk heterojunction
systems; however, precise control of the dimension morphology in a
crystalline, interpenetrating architecture has not yet been realized.
Here we present a simple, yet facile, crystallization technique for
the growth of vertically oriented NPs utilizing a modified thermal
evaporation technique that hinges on a fast deposition rate, short
substrate–source distance, and ballistic mass transport. A
broad range of organic semiconductor materials is beneficial from
the technique to generate NP geometries. Moreover, this technique
can also be generalized to various substrates, namely, graphene, PEDOT–PSS,
ZnO, CuI, MoO<sub>3</sub>, and MoS<sub>2</sub>. The advantage of the
NP architecture over the conventional thin film counterpart is demonstrated
with an increase of power conversion efficiency of 32% in photovoltaics. This technique will advance the
knowledge of organic semiconductor crystallization and create opportunities
for the fabrication and processing of NPs for applications that include
solar cells, charge storage devices, sensors, and vertical transistors