ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Wenwen Liu,Teng Zhang,Baohua Zhao,Chengben Liu,Youru Bai,Zhi Li,Shihui Zhu,Tailin Wang,Xinyu Sun,Heyuan Liu,Zhaobin Liu,Yanli Chen,Xiyou Li
The nonradiative carrier recombination at the perovskite/carrier selective layer (CSL) interface was accounted for the inferior power conversion efficiency (PCE) of perovskite solar cells (PSCs), especially rigid all-inorganic perovskite (CsPbI3 and CsPbBr3). In this study, targeting the poor interface, we introduce SbX3 (X = Cl, Br, I) surface passivation at the CsPbBr3/carbon interface. Smoothed compressive strain, reduced defect density, and enhanced energy-level alignment were achieved simultaneously, facilitating carrier extraction at the selective interface. With the simple aqueous solution-based two-step process, the PCE of our SbI3 passivated carbon-based CsPbBr3 PSCs has increased from 7.81% (without passivation) to 9.69%, a ∼25% enhancement. Specifically, Voc (1.657 V) of the SbI3-passivated cells was much higher than that of the control ones (1.488 V), confirming the ameliorated interface. Finally, our unencapsulated SbI3 passivated devices maintain 90% of their initial PCEs while left in the air for 30 days with a relative humidity of 60%. To conclude, we present an interfacial carrier extraction-enhanced strategy for preparing high-performance and stable CsPbBr3-based PSCs.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
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IF 8.7
Zhicheng Li,Yu Zhang,Xu Fan,Hao Wang,Hongzhen Xie,Peng Li,Weidong Chen,Jinjun Liu,Zhongbin Pan
Polymer-based capacitors are regarded as paramount components in advanced electrical systems due to their intrinsically superior breakdown strength ( E b ) and excellent processability. Although the enhancement of dielectric constant ( ε r ) of polymer-based composites has been realized by loading high‐ ε r inorganic fillers, this approach confronts considerable challenges in filler agglomeration. In this research, CsPbBr 3 (CPB) nanoparticles are via in-situ in ferroelectric polymers [P(VDF-HFP)] to form high-quality nanocomposites. ε r and E b of the nanocomposites are concomitant enhancement via introduction of only 0.1 wt% CPB, leading to an ultrahigh U d ∼ 24.1 J cm −3 at 705 MV m −1 with superior efficiency ( η ) of 64 % and stability up to 2.5 × 10 4 charge–discharge cycles. COMSOL Multiphysics simulations further demonstrate that the in-situ prepared composites are conducive to inhibiting the growth of electric trees caused by inhomogeneous electric field distribution. This contribution extends the synthesis method to prepare perovskites-polymer dielectrics and provides a novel strategy for fabricating high-performance polymer-based composite capacitors.
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ELECTROCHIMICA ACTA
·
2022
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IF 7.336
Yu Zou,Fengxian Cao,Pengxu Chen,Ruowei He,Anling Tong,Cong Yin,Zhang Lan,Weihai Sun,Jihuai Wu
The existence of considerable energy level differences and defects at interfaces between the CsPbBr 3 film and the carbon electrode, have been critical bottlenecks to restrict the development of the photoelectric conversion efficiencies (PCEs) of all-inorganic CsPbBr 3 perovskite solar cells (PSCs). Therefore, to solve this contradiction, the interface engineering has been applied into the interface of CsPbBr 3 /carbon through many passivators. However, most of the passivators reported previously are composed of organic ingredients, which is inconsistent with the concept of the “real all-inorganic” PSCs. Here, NiO nanocrystals (NiO NCs) with hole transporting behaviors were prepared by hydrothermal synthesis method and applied to modify the interface between the CsPbBr 3 film and carbon electrode. After NiO NCs modified, the CsPbBr 3 film with a smoother surface exhibits suppressed interface defects and appropriate interfacial energy band alignment, thereby decreasing the carrier recombination and improving the charge extraction ability. Eventually, by optimizing the concentrations of NiO NCs and the spin-coating cycles of CsBr methanol solution, the NiO NCs-treated device generates a champion efficiency of 9.19% with a short-circuit current (J SC ) of 7.57 mA cm −2 , an open-circuit voltage (V OC ) of 1.57 V and a fill factor (FF) of 77.44%, in comparison with the pristine device with an inferior efficiency of 7.15%, a J SC of 6.92 mA cm −2 , a V OC of 1.48 V and an FF of 69.64%. Furthermore, the NiO NCs modified devices show no significant degradation after 30 days in open-air conditions.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 47
·25212-25219
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IF 14.511
Jia-Nan Huang,Yu-Jie Dong,Hai-Bing Zhao,Hong-Yan Chen,Dai-Bin Kuang,Cheng-Yong Su
The severe photogenerated charge carrier recombination and the poor CO2 adsorption capacity are regarded as the two main factors impeding the photocatalytic CO2 reduction performances of metal halide perovskite (PVK) nanomaterials. Herein, a ternary CsPbBr3/Au/PCN-333(Al) hybrid featuring high CsPbBr3 nanocrystal loading, fast charge separation, and good CO2 uptake is designed and fabricated by using Al-based mesoporous metal–organic framework (MOF) particles to encapsulate CsPbBr3 and Au nanocrystals, for synergetic photocatalytic CO2 reduction. A vacuum-assisted pore-filling method is developed to facilitate the permeation of CsPbBr3 precursor solution into PCN-333(Al), which results in a high CsPbBr3 loading of >40 wt%. Detailed heterostructure and photoelectric property analysis reveal that well-dispersed CsPbBr3 and Au nanocrystals inside the MOF matrix can form close contact with each other, which can extract the photogenerated electrons of CsPbBr3 to Au, so as to effectively inhibit the charge recombination and accelerate the CO generation. As a result, the CsPbBr3/Au/PCN-333(Al) hybrid exhibits a significantly improved CO2 reduction performance with the photoelectron consumption yield (Relectron) being 11.5-fold higher than that of single CsPbBr3 nanocrystals and a 100% selectivity for CO. This study demonstrates a new way to design a high-quality PVK/MOF heterostructure catalyst, which may also find application in other photocatalytic reactions.
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Nano Energy
·
2022
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IF 19.069
Xinpeng Yao,Benlin He,Jingwei Zhu,Junjie Ti,Lifang Cui,Rui Tui,Meng Wei,Haiyan Chen,Jialong Duan,Yanyan Duan,Qunwei Tang
Precise manipulation on buried interface of perovskite film highly determines the photovoltaic performance of perovskite solar cells (PSCs). Herein, we demonstrate a SnO 2 -SnS 2 heterojunction nanocrystal as an efficient electron transfer material to heal the defective interface for planar all-inorganic CsPbBr 3 PSCs. Arising from the matched lattice distance of SnS 2 with SnO 2 and CsPbBr 3 , an all-in-one SnO 2 -SnS 2 -CsPbBr 3 interface is fabricated, in which SnS 2 plays a role of “bridge” to connect incompatible interface. Consequently, the charge recombination loss is minimized owing to the Type-II band alignment and epitaxial growth induced defect reduction, achieving a remarkable efficiency of 10.72% with a high open-circuit voltage of 1.635V. Considering the high tolerance to high humidity (80%) for 700 h and high temperature (80 °C) over 30 days, these preliminary results can provide a new perspective for the rational design of ideal charge transfer materials to improve the efficiency and stability of PSCs.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Qin Jiang,Yanyun Ren,Zhongjie Cui,Zili Li,Laigui Hu,Ruiqian Guo,Shukai Duan,Fengxian Xie,Guangdong Zhou,Shisheng Xiong
The development of a reliable optoelectronic memristor is crucial for the success of neuromorphic vision systems, but current devices are limited by stochastic resistance switching and uncontrollable ion dynamics. To address these challenges, a core–shell nanosphere composite was synthesized using CsPbBr3 quantum dots and block copolymer polystyrene-poly2-vinyl pyridine. This memristor exhibits both negative differential resistance and resistive switching memory behavior and has demonstrated exceptional stability, withstanding over 5000 cycles and remaining stable for over 5 million seconds. It is also tunable by light irradiation, making it ideal for optoelectronic logic operations and multi-derivative state applications. The memory behavior is attributed to an electrochemical metalization mechanism involving the formation and annihilation of pyridine groups, conductive metal filaments, and bromide ion vacancies in S2VP filaments. This work presents an effective method for fabricating robust multi-derivative perovskite optoelectronic devices for neuromorphic computing systems. Additionally, machine learning algorithms have demonstrated accurate digital image classification and recognition using photoelectric pulse-driven neuromorphic computation with an accuracy of over 97%.
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2023
·Vol. 70
·期 7
·1481-1492
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IF 1.8
Jia-Rong Xue,Rong-Chao Xue,Pei-Yao Chen,Yong Wang,Li-Ping Yu
In this study, a hydrostable Z-scheme Ag/CsPbBr 3 /Bi 2 WO 6 photocatalyst was designed and fabricated for the degradation of Rhodamine B (RhB). The structural instability of CsPbX 3 perovskites in water is one of the main obstacles that restrict their practical application in photocatalytic wastewater treatment. The photocatalyst was prepared in three steps: passivation of CsPbBr 3 nanocrystals (NCs) with 3-mercaptopropionic acid (MPA), construction of a heterojunction between MPA-passivated CsPbBr 3 NCs and Bi 2 WO 6 ultrathin nanosheets, and doping Ag nanoparticles as charge mediators in the heterojunction. The as-obtained 5%Ag/20%CsPbBr 3 /Bi 2 WO 6 exhibits good stability and excellent photocatalytic activity. The degradation rate is 93.9% in 120 min, which is 4.41 times than that of Bi 2 WO 6 .
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Hao Lv,Yuan Zheng,Yimin Geng,Shu Xu,Chong Geng
All-inorganic lead halide perovskite nanocrystals (PNCs) have attracted extensive attention in the optoelectronic fields owning to their exceptional photoluminescence characteristics. However, the ultra-fast growth rate of PNCs leads to challenges in controlling their size and optical properties. Here, we report a water–oil droplet fluidic synthesis method that successfully slow down the growth rate of CsPbBr 3 PNCs by segregating the cation and anion precursors in the respective phases. Reaction mechanism study revealed a fast nucleation via a nanoplate-intermediate pathway upon HBr diffusion and subsequent slow growth through ripening, leading to a wide range of spectral tunability of the PNCs from 445 nm to 520 nm. The theoretical investigation into growth kinetics showed the combined effect of the ligands and temperature on the growth of the PNCs. This method provides an efficient means for producing high-performance PNCs with tunable size and wavelength while also eliminating the requirement for a Pb-rich reaction environment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Guoliang Che,Xiying Wang,Can Cui,Beili Pang,Xinjie Wang,Hongzhou Dong,Jianguang Feng,Liyan Yu,Lifeng Dong
In this research, we enhance the stability of all-inorganic CsPbBr 3 perovskite solar cells using a modified multi-step spin-coating technique. By introducing low-concentration CsBr and PbBr 2 in two additional steps, we achieve a PbBr 2 layer with fewer pinholes, improved crystallinity, and a smoother surface. This promotes the formation of a high-quality CsPbBr 3 film with larger grains by incorporating a derivative-phase CsPb 2 Br 5 . This film reduces interface defects, enhances grain growth, and boosts power conversion efficiency from 5.43% to 9.36%. Notably, unencapsulated devices maintain stable performance for over 2400 h in ambient air conditions.
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ACS Applied Electronic Materials
·
2021
·
IF 3.314
Jindou Shi,Ye Tian,Wenxing Gao,Meimei Xu,Yuanting Wu,Wanyin Ge
Exploring a convenient method to solve the stability problem of all-inorganic halide perovskite nanocrystals (NCs) has become an urgent task in their practical application. In recent years, cesium lead halide perovskite CsPbX3 (X = Cl, Br, and I) NCs, as the star material for the development of next-generation optoelectronic devices, have stimulated tremendous interest due to their excellent optical and electronic properties. Unfortunately, the performance of CsPbX3 NCs will become impaired due to interference from the external environment. Here, a convenient one-pot method was proposed, and the transition of CsPbBr3 quantum dots to two-dimensional CsPbBr3/CsPb2Br5 composite plates (CPs) was achieved by adjusting the reaction time. Large-scale octagonal CsPbBr3/CsPb2Br5 CPs were quickly obtained, and the morphology and phase transition in the entire reaction time period were explored. Subsequently, the products obtained at different reaction times were evaluated for long-term storage stability under air conditions, and the results showed that the CsPbBr3/CsPb2Br5 CPs exhibited excellent photoluminescence stability. The proposed preparation method presents a convenient way to improve the stability of CsPbX3 with low cost. On the other hand, by incorporating these products into thermoplastic polyurethane (TPU), a waterproof ink material that can be written directly was realized, where CsPbBr3/CsPb2Br5/TPU waterproof composite ink exhibits excellent stability and recyclability under aqueous solutions at different temperatures, which will provide a new choice for the commercial development of perovskite.
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Nanoscale
·
2021
·Vol. 13
·期 6
·3860-3867
·
IF 7.79
Meng Li,Xiao Zhang,Ping Yang
Silica coating can effectively solve the stability issue of lead halide perovskite nanomaterials. However, it is difficult to achieve aqueous SiO2 coating on hydrophobic CsPbBr3 nanocrystals (NCs). In this paper, the hydrolysis process of tetramethoxysilane was controlled to get a homogeneous SiO2 coating or a NC/SiO2 Janus structure. In step 1, the Cs4PbBr6 NCs were silanized using partially hydrolyzed tetramethoxysilane (PH-TMOS). During this process, the Si–OH groups which came from PH-TMOS were absorbed onto the surface of the Cs4PbBr6 NCs with the removal of hydrophobic oleic acid (OA) ligands. In step 2, phase transformation from Cs4PbBr6 to CsPbBr3 occurred owing to the injection of water. Meanwhile, further hydrolysis of TMOS took place and generated cross-linked Si–O–Si. Because the silanization in step 1 created lots of growth sites, the condensation of SiO2 was not limited to the interface between water and hexane. After growing for 12 h, the fully covered CsPbBr3@SiO2 capsules were prepared. The anion exchange reactions of the CsPbBr3@SiO2 capsules were studied. Only one even and symmetric PL peak was apparent during the anion exchange process, which was different from the bare CsPbBr3 NCs. This result demonstrated that the SiO2 shell can act as a buffer layer to block the direct contact of CsPbBr3 with the excess PbBr2 precursor in solution. Compared with the CsPbBr3 NCs, CsPbBr3@SiO2 showed better stability in polar solvent and air. A bright green emission was also observed under UV light after 90 days. The successful preparation of CsPbBr3@SiO2 capsules with enhanced stability paves the way for the further development of lead halide perovskite nanomaterials.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 32
·2101348
·
IF 18.808
Qiyao Guo,Xiya Yang,Yudi Wang,Wenkai Xu,Jialong Duan,Qunwei Tang
Coupled triboelectric-photovoltaic effect by collecting photogenerated charge carriers is increasingly important to dramatically improve the short-circuit current output of triboelectric nanogenerators (TENG), especially for the all-inorganic cesium lead bromide (CsPbBr 3 ) halide perovskite combined with the optoelectronic and dielectric properties as a fundamental friction layer in TENG. Herein, hole-extraction polydimethylsiloxane (PDMS)-multi-wall carbon nanotubes (MWCNTs) composite film (PC) is applied into the fabrication of vertical contact-separation mode CsPbBr 3 /PC hybrid TENG with dual role of negative triboelectrification layer and photogenerated hole collector. Through precisely regulating the surface potential of PC films by tuning the MWCNT loadings, the charge quantity is greatly enhanced thanks to the triboelectric-photovoltaic coupling effect. The best hybrid TENG at MWCNTs loading of 16 wt% achieves a transferred charge of 0.358 mC under illumination, which is nearly 30,000 times higher than that of the pristine PDMS based TENG. Impressively, the champion hybrid TENG at MWCNTs loading of 12 wt% yields a power rating density of 8.24 W m −2 . This work demonstrates the PC hole collector to be a promising conductive triboelectric counterpart for efficient charge separation and extraction toward booting current density of hybrid triboelectric-photovoltaic devices.
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