Depressed
reaction kinetics due to the electrochemical properties of transition
metal materials themselves and a discordant coexistence relationship
between substrates and these kinds materials remain major problems
in developing high-performance supercapacitors (SCs). Here, a functionalized
N, P dual-doped porous carbon cloth (NPPCC) substrate is designed
using cotton spinning cloth as the original material, and the following
NPPCC-supported Ni and Co bimetallic sulfide (NPPCC-BS) is applied
to construct an SC. The porous carbon networks with structural defects
and heteroatom doping exhibited in such a novel substrate are beneficial
to not only robust and well-conditioned growth of active materials
but also improved interface interrelation, thereby resulting in enhanced
reaction kinetics of the hybrid electrode via strong coupling effect
and stable combination between substrate and active materials. Accordingly,
the NPPCC-BS electrode as positive electrode is fabricated into an
all-solid-state asymmetric SC device; this device delivers high energy
storage and supply capacity (45.8 Wh kg–1 at 15.7
kW kg–1) and an excellent long-term cycling life
(88.6% capacity retention after 15000 cycles).
The explored p-i-n inverted architectural perovskite solar cells (i-PSCs) show promising applications in flexible, large-scale and laminated photovoltaic technology. The polymeric HTMs for i-PSCs have been rarely reported. Thus far,...
Exploring
polymeric hole-transporting materials (HTMs) with passivation
functions represents a simplified and effective approach to minimize
the perovskite defect density. To date, most of reported polymeric
HTMs were applied to fabricate n-i-p regular perovskite solar cells
(PSCs). The polymers compatible for p-i-n inverted PSCs were very
limited. Moreover, the passivation polymers were devoted to passivate
the uncoordinated Pb2+. However, the MA+ cation
defect has profound unwanted effect on device efficiency and long-term
stability. In order to synchronously passivate the Pb2+ and MA+ defects in p-i-n inverted PSCs, a new nonfused
polymer was intentionally explored via mild polymerization. The aromatic
bridge instead of long alkyl chains enabled polymer BN-12 to achieve
excellent thermal stability and good wettability of perovskite precursor.
Furthermore, the incorporation of chemical anchor sites (“CO”
and “F”) strongly controlled the crystallization of
perovskite and restrained the MA+ ion migration. As a result,
a significant fill factor (FF) of 82.9% and an enhanced power conversion
efficiency (PCE) of 20.28% were achieved for MAPbI3-based
devices with the dopant-free BN-12, exceeding those with the commercial
HTM PTAA (FF = 81.7%, PCE = 19.51%). More importantly, the unencapsulated
devices based on BN-12 realized outstanding long-term stability, maintaining
approximately 95% of its initial efficiency after stored for 85 days.
By contrast, the PTAA-based device showed rapid decrease which retained
only 50% of its initial value after 45 days.
The defects in perovskite films hinder the improvement of efficiency and long-term device stability of perovskite solar cells (PSCs). Antisolvent additive engineering has been widely applied to effectively reduce perovskite defects and improve the perovskite crystal quality. However, most of the traditional antisolvent-assisted organic additives endure the disadvantages of high volatility, instability, inflammability, high diffusion coefficient, and even toxicity, which hinder the device's stability for PSCs and raise serious environmental concerns. Herein, in this work, a novel two-dimensional tripolyindene hydrogen-substituted graphdiyne, denoted as DES-O-PHsGY, was synthesized through an easily accessible and biocompatible deep eutectic solvent. XPS measurement demonstrated that DES-O-PHsGY can passivate the lead defects in the perovskite layer. XRD and SEM results verified that DES-O-PHsGY can improve perovskite crystallization. After DES-O-PHsGY was applied as an antisolvent additive for MAPbI3based PSCs, the maximum open-circuit voltage of devices was increased from 1.079 V to 1.106 V, accompanied by a maximum power conversion efficiency of 20.51% surpassing that without the additive (19.51%). More importantly, the perovskite film with DES-O-PHsGY modification showed satisfactory thermal stability under an 80 °C continuous heating process. This work provides a novel method to prepare effective additives for perovskite defect passivation.
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