Dramatic
development in perovskite solar cells (PSCs) and the widespread
application of wearable electronics have attracted extensive research
in the area of large-scale flexible solar power sources based on PSCs.
Manufacturing of flexible PSCs by printing is considered to be one
of the most potential methods. However, it is still a great challenge
to print large-area uniform hole transport layers (HTLs) on a rough
and soft plastic substrate to achieve flexible PSCs with high efficiency
and good stability. Herein, we synthesized a viscous poly(3,4-ethylene
dioxythiophene):graphene oxide (PEDOT:GO) gel and then blade-coated
the gel by high-speed shearing to achieve high-quality HTLs with scalable
size. The glued HTLs exhibit high viscosity, electrical conductivity,
and mechanical flexibility, which enhance the adhesive ability and
protect the brittle ITO electrode and perovskite crystals. Due to
the gelatinous HTLs, we achieved an optimal efficiency of the flexible
PSCs (1.01 cm2) of 19.7%, while that of the large-area
flexible perovskite module (25 cm2) exceeded 10%. This
is the highest efficiency for reported flexible MAPbI3 PSCs
(1.01 cm2). Furthermore, the efficiency retention of the
PSCs remains over 85% after 5000 bending cycles, which is of great
significance for the practical application of PSCs in portable and
wearable electronics.
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