2 research outputs found
High-Performance Flexible Perovskite Solar Cells by Using a Combination of Ultrasonic Spray-Coating and Low Thermal Budget Photonic Curing
Realizing the commercialization of
high-performance and robust perovskite solar cells urgently requires
the development of economically scalable processing techniques. Here
we report a high-throughput ultrasonic spray-coating (USC) process
capable of fabricating perovskite film-based solar cells on glass
substrates with a power conversion efficiency (PCE) as high as 13%.
Perovskite films with high uniformity, crystallinity, and surface
coverage are obtained in a single step. Moreover, we report USC processing
on TiO<sub>2</sub>/ITO-coated polyethylene terephthalate (PET) substrates
to realize flexible perovskite solar cells with a PCE as high as 8.1%
that are robust under mechanical stress. In this case, a photonic
curing technique was used to achieve a highly conductive TiO<sub>2</sub> layer on flexible PET substrates for the first time. The high device
performance and reliability obtained by this combination of USC processing
with optical curing appear very promising for roll-to-roll manufacturing
of high-efficiency, flexible perovskite solar cells
Vacuum-Assisted Low-Temperature Synthesis of Reduced Graphene Oxide Thin-Film Electrodes for High-Performance Transparent and Flexible All-Solid-State Supercapacitors
Simple
and easily integrated design of flexible and transparent
electrode materials affixed to polymer-based substrates hold great
promise to have a revolutionary impact on the functionality and performance
of energy storage devices for many future consumer electronics. Among
these applications are touch sensors, roll-up displays, photovoltaic
cells, health monitors, wireless sensors, and wearable communication
devices. Here, we report an environmentally friendly, simple, and
versatile approach to produce optically transparent and mechanically
flexible all-solid-state supercapacitor devices. These supercapacitors
were constructed on tin-doped indium oxide coated polyethylene terephthalate
substrates by intercalation of a polymer-based gel electrolyte between
two reduced graphene oxide (rGO) thin-film electrodes. The rGO electrodes
were fabricated simply by drop-casting of graphene oxide (GO) films,
followed by a novel low-temperature (≤250 °C) vacuum-assisted
annealing approach for the in situ reduction of GO to rGO. A trade-off
between the optical transparency and electrochemical performance is
determined by the concentration of the GO in the initial dispersion,
whereby the highest capacitance (∼650 μF cm<sup>–2</sup>) occurs at a relatively lower optical transmittance (24%). Notably,
the all-solid-state supercapacitors demonstrated excellent mechanical
flexibility with a capacity retention rate above 90% under various
bending angles and cycles. These attributes underscore the potential
of the present approach to provide a path toward the realization of
thin-film-based supercapacitors as flexible and transparent energy
storage devices for a variety of practical applications