ChemSusChem
·
2020
·Vol. 13
·期 7
·1834-1843
·
IF 7.962
Jingwei Zhu,Benlin He,Zekun Gong,Yang Ding,Wenyu Zhang,Xueke Li,Zhihao Zong,Haiyan Chen,Qunwei Tang
Graphical Against the grain : Adding melamine maximizes grain size and minimizes defects in CsPbBr 3 perovskite films. The resulting CsPbBr 3 perovskite solar cell (PSC) free of encapsulation achieves a champion power conversion efficiency (PCE) of 9.65 % and excellent thermal and humidity stability. The preparation of high-quality perovskite films with low grain boundaries and defect states is a prerequisite for achieving high-efficiency perovskite solar cells (PSCs) with good environmental stability. An effective additive engineering strategy has been developed for simultaneous defect passivation and crystal growth of CsPbBr 3 perovskite films by introducing 1,3,5-triazine-2,4,6-triamine (melamine) into the PbBr 2 precursor solution. The resultant melamine–PbBr 2 film has a loose, large-grained structure and decreased crystallinity, which has a positive effect on the crystallization process of the perovskite as it retards the crystallization rate as a result of the interaction between melamine and lead ions. Additionally, the passivation by melamine gives a high-quality CsPbBr 3 perovskite film with fewer grain boundaries, lower defect densities, and better energy level matching is achieved by multistep liquid-phase spin-coating, which greatly suppresses the nonradiative recombination resulting from the defects and promotes charge extraction at the interface. A champion power conversion efficiency as high as 9.65 % with a promising open-circuit voltage of 1.584 V is achieved for PSCs with an architecture of fluorine-doped tin oxide/c-TiO 2 / m -TiO 2 /melamine-added CsPbBr 3 /carbon-based hole-transporting layer. Furthermore, the unencapsulated melamine-added CsPbBr 3 PSC shows superior thermal and humidity stability in ambient air at 85 °C or 85 % relative humidity over 720 h.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jichong Wang,Jin Wang,Nuoya Li,Xinyi Du,Jun Ma,Chaohua He,Zhengquan Li
Photocatalytic CO2 reduction is an appealing approach to convert solar energy into high value-added chemicals. All-inorganic CsPbBr3 quantum dots (QDs) have emerged as a promising photocatalyst for reducing CO2. However, pristine CsPbBr3 has a low catalytic performance, mainly due to severe charge recombination. Herein, a 0D/2D heterojunction of CsPbBr3 QDs/Bi2WO6 nanosheet (CPB/BWO) photocatalysts is fabricated for photocatalytic CO2 reduction. The CPB/BWO photocatalyst achieves excellent photocatalytic performance: the total yield of CH4/CO is 503 μmol g–1, nearly 9.5 times higher than the pristine CsPbBr3. The CPB/BWO heterojunction also exhibits much-improved stability during photocatalytic reactions. On the basis of various characterization techniques, our investigations verified a direct Z-scheme charge migration mechanism between CsPbBr3 QDs and Bi2WO6 nanosheets. The improved photocatalytic performance is originated from the high spatial separation of photoexcited charge carriers in CPB/BWO, which can also preserve strong individual redox abilities of two components. This work reports an efficient direct Z-scheme heterojunction photocatalytic system based on metal halide perovskites. The novel strategy we proposed may bring up new opportunities for the development of metal halide perovskite photocatalysts with greatly enhanced activities.
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DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 44
·7805-7812
·
IF 3.545
Wenwei Lai,Chuanli Wu,Wenhui Li,Xiuxun Han
The ligand assisted reprecipitation (LARP) approach is a convenient method for synthesizing CsPbX3 NCs at room temperature. However, several remaining challenges limit its further development, such as the utilization of toxic solvents and fast crystallization brings colloidal uncontrollable synthesis issues. In this work we apply the principles of green chemistry to the LARP technique for synthesizing CsPbBr3 NCs under ambient conditions in a controllable way. Through the variation of non-toxic ester solvents with different polarity and reaction time, we demonstrate the size tunability of one-dimensional (1D) CsPbBr3 nanocrystals synthesized in a green solvent system. Due to the strong quantum confinement effect, the obtained CsPbBr3 NCs exhibited a wide photoluminescence emission (471–508 nm) and high quantum yield up to 78%. Interpretations on the related growth mechanism of CsPbBr3 nanocrystals in a polarity-mediated solution are suggested for exploring effective strategies towards high-quality inorganic perovskite nanocrystals with definite morphologies. Finally, to explore the potential applications of CsPbBr3 in white light-emitting diodes (WLEDs), cyan emission of CsPbBr3 NCs (480 nm) is combined with blue, green, and red emissions from commercial powders to achieve white light with excellent vision performance. The device displays a super high color rendering index of 96.5.
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DOI
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 28
·285706
·
IF 3.404
He Shao,Xue Bai,Gencai Pan,Haining Cui,Jinyang Zhu,Yue Zhai,Jingshi Liu,Biao Dong,Lin Xu,Hongwei Song
Inorganic perovskite quantum dots (QDs) have attracted wide attention in display and solid-state lighting because of their easily tunable band-gaps and high photoluminescence quantum yields (PLQY) of green light emission. However, some drawbacks limit their practical applications, including the low PLQY of blue light emission and the instability in the moisture environment. In this work, efficient blue-light emitting CsPbBr3 perovskite QDs with PLQY of 72% were developed through a bandgap engineering approach. The achieved blue-light emitting PLQY is much higher than the values acquired in the inorganic perovskite QDs in the literature. And the emission color of the as-prepared QDs can be facially tuned by only adjusting the reaction temperature. Further, the mono-dispersed perovskite QDs@SiO2 composites were constructed benefiting from the low temperature synthesis. The optical performance of the QDs could be well persisted even in the moisture environment. Finally, the as-prepared QDs@SiO2 composite was fabricated as the QD ink on the anti-counterfeit printing technology, from which the obtained pattern would emit varied color under UV lamp. And the as-prepared composites was also applied for fabricating WLED, with Commission Internationale de l'Eclairage (CIE) color coordinates of (0.33, 0.38) and power efficiency of 32.5 lm W−1, demonstrating their promising potentials in solid-state lighting.
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DOI
高影响因子
Small Methods
·
2023
·Vol. 7
·期 10
·2300394
·
IF 12.4
Yuhao Geng,Haoyang Hu,Yongqi Jia,Xintong Huang,Tian Yang,Runzhe Liang,Zhuo Chen,Zhihong Yuan,Jianhong Xu
Lead halide perovskite nanocrystals (LHP NCs) have the characteristics of fast reaction kinetics and crystal instability due to the intrinsically highly ionic bonding between the respective ions, which bring challenges for revealing the growth kinetics and practical applications. Compared with conventional batch synthesis methods, the single-function microreactor can achieve precise and stable control of the NCs synthesis process, but it still has the shortcoming of not being able to obtain information about the growth process. In this study, a micro Total Reaction System (μTRS) with remote control, online detection, and rapid data analysis functions is designed. μTRS can sample the photoluminescence information of CsPbBr 3 NCs growth in ligand-assisted reprecipitation method. CsPbBr 3 NCs with an emission range of 435–492 nm are successfully detected, which breaks the record of the smallest size of CsPbBr 3 NCs synthesized directly from precursors. The real-time feature of μTRS enables the construction of an automated close-loop synthesis system. Besides, the rapid acquisition and timely processing of product information enable the rapid mapping of the operation space for CsPbBr 3 NCs preparation, which provides a reliable and learnable data set for designing a fully autonomous microreaction system capable of synthesizing NCs.
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 5
·1253
·
IF 5.076
Xianwei Meng,Kailin Chi,Qian Li,Bingtao Feng,Haodi Wang,Tianjiao Gao,Pengyu Zhou,Haibin Yang,Wuyou Fu
In the process of preparing CsPbBr3films by two-step or multi-step methods, due to the low solubility of CsBr in organic solvents, the prepared perovskite films often have a large number of holes, which is definitely not conducive to the performance of CsPbBr3perovskite solar cells (PSCs). In response to this problem, this article proposed a method of introducing InBr3into the PbBr2precursor to prepare a porous PbBr2film to increase the reaction efficiency between CsBr and PbBr2and achieve the purpose of In (Ⅲ) incorporation, which not only optimized the morphology of the produced CsPbBr3film but also enhanced the charge extraction and transport capabilities, which was ascribed to the reduction of the trap state density and impurity phases in the perovskite films, improving the performance of CsPbBr3PSCs. At the optimal InBr3concentration of 0.21 M, the InBr3:CsPbBr3perovskite solar cell exhibited a power conversion efficiency of 6.48%, which was significantly higher than that of the pristine device.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 17
·1-11
·
IF 2.8
Mei Xiang,Xiang Zhiwei,Mo Dingdiao,Fu Weihai,Jin Peixuan,Huang Xiaocong,Yang Yuanzheng,Cai Weitong
CsPbBr 3 perovskite solar cells (PSCs) have attracted a lot of attention due to their excellent long-term stability and easy fabrication in humid air. The preparation of the light-absorbing layer is crucial for achieving high efficiency in CsPbBr 3 perovskite solar cells. In this study, methylammonium iodide (CH 3 NH 3 I, MAI) was introduced into the PbBr 2 precursor solution to improve the quality of perovskite films and the photovoltaic performance of PSCs. The spin-coating method was employed to prepare CsPbBr 3 films in ambient air. Firstly, a layer of PbBr 2 film was spin-coated, followed by two spin-coatings of CsBr solution on top of it. By adjusting the content of MAI additives, a PbBr 2 film with a microporous structure was obtained. These porous structures acted as channels for CsBr molecules, enabling them to react fully with PbBr 2 and more favorable for the crystallization of CsPbBr 3 . As a result, we achieved the high-purity, high-crystallinity, and continuous CsPbBr 3 films. Furthermore, we utilized CsPbBr 3 films as the light-absorbing layer in PSCs with a structure of FTO/c-TiO 2 /m-TiO 2 /CsPbBr 3 /carbon, a champion power conversion efficiency of 8.02% was achieved, and the unencapsulated device showed excellent long-term stability.
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高影响因子
Advanced Science
·
2023
·Vol. 10
·期 18
·2300650
·
IF 15.1
You Xue,Tao Yang,Yapeng Zheng,Kang Wang,Enhui Wang,Hongyang Wang,Laipan Zhu,Zhentao Du,Hailong Wang,Kuo-Chih Chou,Xinmei Hou
Piezoelectric nanogenerator (PENG) for practical application is constrained by low output and difficult polarization. In this work, a kind of flexible PENG with high output and self-polarization is fabricated by constructing CsPbBr 3 –Ti 3 C 2 T x heterojunctions in PVDF fiber. The polarized charges rapidly migrate to the electrodes from the Ti 3 C 2 T x nanosheets by forming heterojunctions, achieving the maximum utilization of polarized charges and leading to enhanced piezoelectric output macroscopically. Optimally, PVDF/4wt%CsPbBr 3 /0.6wt%Ti 3 C 2 T x -PENG exhibits an excellent voltage output of 160 V under self-polarization conditions, which is higher than other self-polarized PENG previously. Further, the working principle and self-polarization mechanism are uncovered by calculating the interfacial charge and electric field using first-principles calculation. In addition, PVDF/4wt%CsPbBr 3 /0.6wt%Ti 3 C 2 T x -PENG exhibits better water and thermal stability attributed to the protection of PVDF. It is also evaluated in practice by harvesting the energy from human palm taps and successfully lighting up 150 LEDs and an electronic watch. This work presents a new idea of design for high-performance self-polarization PENG.
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DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 3
·842-850
·
IF 7.059
Mengmeng Yu,Xin He,Danyang Li,Jing Lin,Chao Yu,Yi Fang,Zhenya Liu,Zhonglu Guo,Yang Huang,Chengchun Tang
All-inorganic CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) are prone to degradation under certain conditions, such as air, ultraviolet light and high temperature, which limits their practical applications. Here, we report the utilization of four kinds of BN nanomaterials, namely BN nanosheets (BNNS), BN nanofibers (BNNF), commercial BN nanosheets (C-BNNS) and BN nanospheres (BNNP), as carriers for supporting CsPbBr3 (CPB) QDs to obtain a series of CPB/BN nanocomposites. A comprehensive study on the microstructures, photoluminescence (PL) properties, and the stabilities of various nanocomposites under different conditions (air, ultraviolet light and high temperature) has been carried out. The results show that the addition of BN can not only retain the excellent PL properties of CsPbBr3 QDs, but also improve their photostabilities, long-term storage stabilities, and thermal stabilities. Comparative studies also demonstrate that BN nanomaterials with different structures have great influence on the properties of CPB/BN nanocomposites. BNNS and BNNF with high specific surface areas and surface functional groups can provide a large number of adsorption sites for the uniform anchoring of CsPbBr3 QDs, thus effectively improving the PL and stability performance of the nanocomposites. In particular, compared with the QDs loaded on the surface of nanofibers, the CsPbBr3 QDs can be better protected by multi-layered nanosheets with a flexible feature and folds, thereby showing higher crystallinity. Finally, the best-performing CPB/BNNS nanocomposite is made into a white LED device, which emits bright white light with a correlated color temperature of 5531 K. The findings can provide an effective guiding strategy for the development of high-performance BN-based nanocomposites, which are of great significance due to their great potential applications in solid-state lighting.
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高影响因子
Heliyon
·
2023
·
IF 4
Kai Huang,Feng Jiao Zhao,Wen Qiang Song,Chang Yuan Xu,Hong Ming Yin
Er 3+ has received extensive attention due to its excellent optical properties, especially its emission at 1535 nm in atmospheric propagation window. Enhancement and regulation of 1535 nm emission of Er 3+ is of great significance to optical communication. In this work, growing of CsPbBr 3 QDs has been controlled through adjusting annealing time which would precisely regulate conduction band of CsPbBr 3 QDs to match energy levels of Er 3+ enabling energy transfer between Er 3+ and CsPbBr 3 QDs. By steady-state and transient PL emission and excitation spectroscopy, we reveal multiple energy transfer processes between Er 3+ and CsPbBr 3 QDs under different excitation wavelengths in Er 3+ doped CsPbBr 3 QDs glass: under higher energy excitation (∼378 nm), energy transfer from Er 3+ to CsPbBr 3 QDs and this extra energy within CsPbBr 3 QDs decay via a non-radiative pathway; under lower energy excitation (∼524 nm), energy transfer from conduction band of CsPbBr 3 QDs to 4 S 3/2 energy level of Er 3+ which significantly enhances PL emission of Er 3+ in near infrared region (∼1535 nm, 4 I 13/2 → 4 I 15/2 ). These results provide a facile approach to enhance and regulate PL emission of Er 3+ in near infrared region.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jiannan Sun,Pan Zhang,Ke Yan,Aizhao Pan,Christophe Len,Weiyi Ouyang,Chengyu Shi,Xinyi Shi,Jun Hong
Quantum dots (QDs) with dual-emission property have garnered significant attention as prototype platforms for temperature measurement due to their self-calibration capabilities and high sensitivity. The assembly and property modulation of this materials hold great research value. In this work, we propose a strategy to utilize dendritic mesoporous SiO 2 core–shell spheres to encapsulate dual QDs, enabling the constructing of dual-emission fluorescent temperature sensing system. By encapsulating CsPbBr 3 and CdTe QDs in SiO 2 core–shell spheres, we developed a dual-emission temperature probe that employs two thermometry modes: peak wavelength spacing variation and fluorescence intensity ratio. This probe offers advantages such as high thermal stability, excellent fit, and high sensitivity. Additionally, inspired by the concept of series sliding resistors, we introduced a novel approach to adjust the probe’s sensitivity by treating the fluorescence intensity and peak wavelength of the dual QDs as the “sliding resistor”. This innovation results in a temperature fluorescence sensing system with tunable sensitivity. We also explored the potential applications of these probes in temperature measurement, light-emitting diodes, and fluorescent anti-counterfeiting. Our research presents an effective strategy for the rational design of high-performance dual-emission fluorescence temperature sensing systems with customizable sensitivity.
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产品关联
DOI
PubMed
高影响因子
European Physical Journal-Special Topics
·
2025
·
IF 2.3
Zhang Yu,Wen Yunli,Dai Yuxiang,Li Guishun,Yun Junqiang,Jing Chengbin
The susceptibility to optical instability of perovskite nanocrystals (NCs) under ambient conditions is a serious hindrance for practical applications. The conventional SiO 2 coating method for enhancing stability suffered from long reaction times and complicated preparation procedures. In this study, a facile and convenient room-temperature one-pot approach was developed to fabricate CsPbBr 3 /SiO 2 NCs, which involves the addition of tetramethoxysilane (TMOS) in advance. Owing to surface passivation, the PLQY of the CsPbBr 3 /SiO 2 NCs increased to 90% from 70% of the primitive CsPbBr 3 NCs. The SiO 2 layer formed by the TMOS hydrolysis and condensation reactions also protect the CsPbBr 3 NCs from external environment stimuli. Compared with the pristine CsPbBr 3 NCs, the air stability, structural stability, polar solvent resistance, thermal stability, and UV resistance stability of the CsPbBr 3 /SiO 2 NCs are markedly enhanced. Also, the CsPbBr 3 /SiO 2 NCs can be used as green phosphors for white light-emitting diode (WLED), which exhibits a luminous efficiency of 40 lm/W.
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产品关联
DOI
高影响因子
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