4 research outputs found
SingleâCrystal Nanowire Cesium Tin Triiodide Perovskite Solar Cell
Abstract This work reports for the first time a highly efficient singleâcrystal cesium tin triiodide (CsSnI 3 ) perovskite nanowire solar cell. With a perfect lattice structure, low carrier trap density (â5Â ĂÂ 10 10 cm â3 ), long carrier lifetime (46.7Â ns), and excellent carrier mobility (>600 cm 2 V â1 s â1 ), singleâcrystal CsSnI 3 perovskite nanowires enable a very attractive feature for flexible perovskite photovoltaics to power active microâscale electronic devices. Using CsSnI 3 singleâcrystal nanowire in conjunction with highly conductive wide bandgap semiconductors as frontâsurfaceâfield layers, an unprecedented efficiency of 11.7% under AM 1.5G illumination is achieved. This work demonstrates the feasibility of allâinorganic tinâbased perovskite solar cells via crystallinity and deviceâstructure improvement for the highâperformance, and thus paves the way for the energy supply to flexible wearable devices in the future
Surface Modification in CsPb<sub>0.5</sub>Sn<sub>0.5</sub>I<sub>2</sub>Br Inorganic Perovskite Solar Cells: Effects of Bifunctional Dipolar Molecules on Photovoltaic Performance
Inorganic tinâlead binary perovskites have piqued
the interest
of researchers as effective absorbers for thermally stable solar cells.
However, the nonradiative recombination originating from the surface
undercoordinated Sn2+ cations and the energetic offsets
between different layers cause an excessive energy loss and deteriorate
the perovskite deviceâs performance. In this study, we investigated
two thioamide derivatives that differ only in the polar part connected
to their common benzene ring, namely, benzenecarbothioamide and 4-fluorophenylcarbothioamide
(F-TBA). These two molecules were implemented as modifiers onto the
inorganic tinâlead perovskite (CsPb0.5Sn0.5I2Br) surface in the perovskite solar cells. Modifiers
that carry CS and NH2 functional groups, equipped
with lone electron pairs, can autonomously associate with surface
Sn2+ through coordination and electrostatic attraction
mechanisms. This interaction serves effectively to passivate the surface.
In addition, due to the permanent dipole moment of the intermediate
layer, an interfacial dipole field appears at the PCBM/CsPb0.5Sn0.5I2Br interface, reducing the electron
extraction potential barrier. Consequently, the planar solar cell
with an ITO/PEDOT:PSS/CsPb0.5Sn0.5I2Br/PCBM/BCP/Ag layered structure featuring an F-TBA surface post-treatment
demonstrated a noteworthy power conversion efficiency of 14.01%. Simultaneously,
after being stored for 1000 h in an inert atmosphere glovebox, the
non-encapsulated CsPb0.5Sn0.5I2Br
solar cells managed to preserve 94% of their original efficiency