In recent years, organic–inorganic halide perovskite solar cells (PSCs) have attracted massive attention because of its high power conversion efficiency (PCE). However, it’s difficult for preparation of perovskite film with...
Charge accumulation and charged defects at both bulk
and buried
heterojunction interfaces of perovskites are primarily related to
the photovoltaic performance and shelf stability of perovskite solar
cells (PSCs). Moreover, detrimental defects distributing along the
perovskite bottom side in contact with the tin oxide (SnO2) surface may exert unparalleled significance in charge extraction
and transport. Most importantly, interfacial nonradiative recombination
can also widely exist, which will seriously hamper efficiency of the
related device. In this work, a multifunctional chemical bridge at
the perovskite/SnO2 interface is devised through triggering
an in situ polymerization strategy, by which cross-linked
polymerizable 3-(trimethoxysilyl)propyl methacrylate (MAPS) monomers
under the combination of temperature and initiators can form bulkier
macropolymers (MAPS dimers). Detailed theoretical and experimental
results reveal that the carbonyl groups (CO) of both MAPS
monomers and MAPS dimers can chemically anchor to perovskite bottom
side through a CO···Pb coordination bond interaction
to regulate the film quality and the siloxane groups effectively couple
with oxygen vacancies on the SnO2 film surface to facilitate
its optoelectronic properties. Compared with the primitive MAPS monomer
units, the resultant MAPS dimers simultaneously prevent interfacial
charge accumulation and demonstrate a more benign energy level alignment
to further augment photovoltaic performance of PSCs. Thus, the devices
assembled under open-air conditions based on double-sided passivation
deliver a decent photoelectronic performance with the champion efficiency
of 20.94% accompanied by negligible hysteresis. Meanwhile, the unencapsulated
targeted devices maintain 93.1% and 86.5% of their original efficiency
after continuous 500 h thermal treatment and 500 h light illumination
under open-circuit conditions, respectively.
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