Layered V<sub>2</sub>O<sub>5</sub>/PEDOT Nanowires
and Ultrathin Nanobelts Fabricated with a Silk Reelinglike Process
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Abstract
For the first time, a method resembling
a cocoon-to-silk fiber
reeling process is developed to fabricate layered V<sub>2</sub>O<sub>5</sub>/PEDOT nanowires (VP NWs) by stirring V<sub>2</sub>O<sub>5</sub> powder in an aqueous solution of 3,4-ethylenedioxythiophene (EDOT).
A mechanistic study indicates that the growth of VP NWs started from
the intercalation/polymerization of EDOT within a few V<sub>2</sub>O<sub>5</sub> surface layers, which were then peeled off to produce
nanowires. The resulting VP NWs were further exfoliated to form 3.8
nm ultrathin V<sub>2</sub>O<sub>5</sub>/PEDOT nanobelts (VP NBs) consisting
of V<sub>2</sub>O<sub>5</sub> atomic bilayers intercalated with PEDOT.
These VP NBs can be dispersed well in various solvents including water,
ethanol, DMF, and acetonitrile for the preparation of transparent
thin films as the hole extraction layer (HEL) to replace PEDOT:PSS
in solution-processed inverted planar perovskite solar cells (PSCs).
Cell efficiency tests over 7 days revealed that PSCs fabricated with
VP NBs as HEL retained the initial power conversion efficiency (PCE),
while those with PEDOT:PSS as HEL suffered from an efficiency drop
of more than 50%
