The interfacial properties for the buried junctions of the perovskite solar cells (PSCs) play a crucial role for the further enhancement of the power conversion efficiency (PCE) and stability of devices. Delicate manipulation of the interface properties such as the defect density, energy alignment, perovskite film quality, etc., guarantees efficient extraction and transport of photogenerated carriers. Herein, chlorobenzenesulfonic potassium salts are presented as a novel multifunctional agent to modify the buried tin oxide (SnO2)/perovskite interface for regular PSCs. The increasing number of carbon‐chlorine bonds (CCl) in 2,4,5‐trichlorobenzenesulfonic potassium (3Cl‐BSAK) exhibit efficient interaction with uncoordinated Sn, effectively filling oxygen vacancies in the SnO2 surface. Importantly, synergistic effects of the functional group‐rich organic anions and the potassium ion are achieved for reduced defect density, carrier recombination, and hysteresis. A champion PCE of 24.27% and the open‐circuit voltage (VOC) up to 1.191 V for modified devices are obtained. The unencapsulated devices maintain 80% of their initial PCE after aging at 80 °C for 800 h in the atmosphere and 95% after aging for 100 d. With 3Cl‐BSAK decoration, a high efficiency semitransparent PSC with a PCE of 12.83% and an average visible light transmittance (AVT) over 27% is also obtained.
Perovskite Solar Cells
In article number 2200417, Juan Zhao, Jie Zhong, and co‐workers report the use of an organic potassium salt with chlorine groups (3Cl‐BSAK) to modify the buried SnO2/perovskite interface in perovskite solar cells. A high efficiency of 24.27% and an open‐circuit voltage up to 1.191 V of modified devices are obtained with elevated stability.
Spiro-FPA, a novel blue emitter, in which two identical anthracene luminophores are linked orthogonally around a spirobifluorene core, has been synthesized and characterized. The introduction of a spiro linkage into the structure of spiro-FPA leads to a reduction in crystallization tendency and an increase in glass transition temperature relative to the monomeric units. In addition, the tetrahedral nature of the carbon atom at the spiro center preserves the optical and electrochemical characteristics of the pristine anthracene units. As demonstrated by AFM measurements, high-quality amorphous films of spiro-FPA with good morphological stability can be prepared by vapor deposition. Organic EL devices constructed using a 1.0-wt % TBP-doped spiro-FPA emitting layer produce bright blue emissions with a high luminescence efficiency of 4.9 cd/A (2.07 lm/W).
The
all-inorganic CsPb(I
x
Br1–x
)3 (0 ≤ x ≤
1) perovskite solar cells (PSCs) are attractive by virtue of their
high environmental and thermal stability. Nevertheless, multiple-step
deposition and high annealing temperature (>250 °C) and the
structural
and optoelectronic properties changes upon temperature-dependent phase-transition
are potential impediments for highly efficient and stable PSCs. Herein,
a space-confined method to fabricate stable lower-order symmetric
pure monoclinic CsPbBr3 phase at low temperature (<50
°C) is for the first time reported. It is found that the carbon-based
mesoporous fully printable area can inhibit the phase transition to
get a pure phase. Therefore, the device exhibits a power conversion
efficiency of 7.52% with a low hysteresis index of 0.024. Moreover,
the device passed the 1000 h 85 °C thermal test and the 200 cycles
thermal cycling test according to IEC-61625 stability tests. These
are critical progresses for achieving long-term stability and the
stable pure inorganic perovskite phase of high-performance photovoltaics.
A low-temperature carbon electrode with good perovskite compatibility is employed in hole-transport-material free perovskite solar cells, and a champion power conversion efficiency (PCE) of 11.7% is obtained.
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