Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 23
·13925-13932
·
IF 10.7
Ruichen Bai,Bangzhi Ge,Xin Liu,Xinkai Peng,Xin Zhang,Shilin Liu,Menghua Zhu,Chongjian Zhou,Alain Dubois,Wanqi Jie,Yadong Xu
The understanding and suppression of grown-in defects are expected to promote the semiconductor radiation detector performance. Here, we report the origin of liquid inclusion defects in CsPbBr3 crystals grown using the inverse temperature crystallization (ITC) method. The formation process of liquid inclusions is observed in situ and simultaneously the formation mechanism for liquid inclusions in CsPbBr3 bulk crystals is proposed. Based on the COMSOL Multiphysics simulation, a model is developed combining concentration and temperature gradients, associated with natural convection during crystallization, and is responsible for the liquid inclusions. By introducing forced convection to eliminate liquid inclusions, the crystalline quality of CsPbBr3 has been significantly improved, with the half-peak width of X-ray rocking curves optimized from 0.101° to 0.037°. A near one order of magnitude increase in bulk resistivity has been obtained while the hole mobility was improved to 142.95 cm−2 V−1 s−1, evaluated by the time-of-flight technique according to α particle induced pulses. Furthermore, the CsPbBr3 crystals free from liquid inclusions enable the fabrication of an asymmetric planar Au/CsPbBr3/Sn device with an energy resolution of 7.2% illuminated with 137Cs@662 keV γ-rays.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xin Li,Jian Zhang,Jie Liu,Feng Zhang,Siyuan Luo,Huaiqiang Ba,Yu Zhang,Xuhui Xu,Zhichao Liu
Due to the sensitivity to water, the all-inorganic CsPbBr 3 nanocrystals have been widely applied in information encryption with spatial dimensions. However, the absence of time-dimension information limits the information capacity for the application of CsPbBr 3 . In this work, the CsPbBr 3 nanocrystal was combined with water-sensitive borophosphate glass, achieving decomposing/recrystallization of CsPbBr 3 nanocrystal with multi-dimension. The addition of SiO 2 confirms that the collapse of the borophosphate glass network structure causes the exposure of the CsPbBr 3 nanocrystals. The decomposition and recrystallization mechanism of CsPbBr 3 nanocrystals in glass-ceramics upon encountering water has been verified. Finally, an information encryption strategy, using the mixture of CsPbBr 3 glass ceramic and sodium carboxymethylcellulose as ink, is designed via adopting screen-printing technology, which not only provides a new idea for the preparation of CsPbBr 3 nanocrystals, but also establish a new avenue for the information encryption technology.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xuandong Wang,Jie He,Jieyuan Li,Gang Lu,Fan Dong,Tetsuro Majima,Mingshan Zhu
Direct conversion CO 2 to useful chemical fuels by photocatalysis has been considered to be a promising strategy for renewable energy production. The realization of this goal relies mainly on the development of photocatalysts with ideal charge separation efficiency. Here, we use all-inorganic perovskite nanocrystals (CsPbBr 3 ) immobilized on two-dimensional (2D) black phosphorus nanosheets (BP), resulting in a new and effective CsPbBr 3 /BP photocatalyst for CO 2 photoreduction. Compare to pristine CsPbBr 3 , the introduction of BP generates more active sites for facilitating CO 2 activation and trapped the excited electrons from CsPbBr 3 with high charge separation efficiency. Time-resolved photoluminescence and transient absorption measurements together with density functional theory calculations provide a clear elucidation of the charge separation pathways that contribute to the enhanced CO 2 conversion rate. This significant feature provides a new venue for constructing all-inorganic perovskite-based photocatalyst by combining with BP for solar energy conversion and artificial photosynthesis.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Zhang Xin,Bai Ruichen,Fu Yuhao,Hao Yingying,Peng Xinkai,Wang Jia,Ge Bangzhi,Liu Jianxi,Hu Yongcai,Ouyang Xiaoping,Jie Wanqi,Xu Yadong
α particles must be monitored to be managed as radioactive diagnostic agents or nuclear activity indicators. The new generation of perovskite detectors suffer from limited energy resolution, which affects spectroscopy and imaging applications. Here, we report that the solution-grown CsPbBr 3 crystal exhibits a low and stable dark current (34.6 nA·cm −2 at 200 V) by thinning the as-grown crystal to decrease the high concentration CsPb 2 Br 5 phase near the surface. The introduction of the Schottky electrode for the CsPbBr 3 detector further reduces the dark current and improves the high-temperature stability. An energy resolution of 6.9% is achieved with the commercial electronic system, while the effects of air scattering and absorption are investigated. Moreover, 1.1% energy resolution is recognized by a full-customized readout application-specific integrated circuit without any additional signal processing, which matches well with the given parameters of the CsPbBr 3 detector by reducing the parasitic capacitance and electronic noise.
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OPTICAL MATERIALS
·
2019
·
IF 2.687
Zhiliang Chen,Yating Zhang,Yu Yu,Yongli Che,Lufan Jin,Yifan Li,Qingyan Li,Tengteng Li,Haitao Dai,Jianquan Yao
Write Once Read Many (WORM) Memory, as one of the most important nonvolatile memory type, has widespread used in a variety of permanent storage applications in the Big Data age. As an excellent material, CsPbBr 3 quantum dots have widely used in a lot of photoelectric devices, but CsPbBr 3 quantum dots based memory device remain to be studied. In this work a WORM memory device based on CsPbBr 3 quantum dots is demonstrated. The CsPbBr 3 QDs based WORM shows great reproducibility, good data retention ability, irreversible electrical transition from the high resistance state (HRS) or OFF state to the low resistance state (LRS) or ON state and the resistance ratio (ON/OFF) can reach almost 10 4 . Additionally, the device exhibits high performances under low power consumption — low reading voltage (−0.5 V) and writing voltage (−1.1V). To study the CsPbBr 3 QDs based WORM provides an opportunity to develop the next generation high-performance and stable WORM devices.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 13
·4038-4043
·
IF 4
Jin Tan,Jie Dou,Jialong Duan,Yuanyuan Zhao,Benlin He,Qunwei Tang
Carbon-based all-inorganic perovskite solar cells have attracted growing interest owing to their simple fabrication process, low cost, and high stability in air. On account of the large interfacial energy barriers and polycrystalline features of perovskite films, the carrier interface recombination and inherent defects in the perovskite layer are still great challenges in further increasing the power conversion efficiency and stability of carbon-based PSCs. We present here a trifunctional polyethylene oxide buffer layer at the perovskite/carbon interface to promote the PCE and stability of carbon-based all-inorganic CsPbBr3 PSCs: (i) the PEO layer increases the crystallinity of inorganic CsPbBr3 grains for low defect state density; (ii) the oxygenic groups in PEO chains passivate the defects on the perovskite surface; and (iii) the long hydrophobic alkyl chains improve the stability in moisture. The best encapsulated PSC achieves a PCE of 8.84% and maintains 84.8% of its initial efficiency in air with 80% RH over 30 days.
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RARE METALS
·
2025
·Vol. 44
·期 5
·3069-3079
·
IF 11
Zhang Si-Yu,Guo Xing,Xu Yu-Meng,Jiao Yong,Lin Zhen-Hua,Zhang Jin-Cheng,Ouyang Jian-Yong,Guo Li-Xin,Hao Yue,Chang Jing-Jing
CsPbBr 3 perovskite solar cells (PSCs) have attracted significant interest for their remarkable stability under high temperatures and humidity. However, challenges such as energy loss at the CsPbBr 3 /oxide buried interface and imperfect band alignment have impeded further efficiency enhancements. In this study, TiO 2 , SnO 2 , or ZnO was employed as electron transport layer (ETL) materials, respectively, in CsPbBr 3 -based PSCs to optimize the band alignment at the ETL/CsPbBr 3 interface and enhance the film quality of CsPbBr 3 materials. The research findings indicate that the power conversion efficiency (PCE) of PSCs is influenced by the choice of ETL material. Specifically, TiO 2 -based PSCs achieved a PCE of 10.37% efficiency, higher than SnO 2 - or ZnO-based PSCs. This disparity in PCE can be attributed to variations in open-circuit voltage, which stem from different band alignments at the ETL/CsPbBr 3 interface. Notably, superior photovoltaic performance was consistently observed in TiO 2 -based PSCs due to the substantial conduction band offset (∆ E c ) at the TiO 2 /CsPbBr 3 interface and the high quality of the CsPbBr 3 film. This not only enhances electron extraction at the TiO 2 /CsPbBr 3 interface but also diminishes non-radiative recombination at the interface, as confirmed by density functional theory (DFT) calculations and experiments. Furthermore, photodetectors (PDs) based on TiO 2 /CsPbBr 3 heterojunction exhibit high photoresponse and photodetectivity. In conclusion, this study underscores the critical importance of the buried interface contact in CsPbBr 3 and offers a direct approach for fabricating efficient and stable inorganic PSCs and PDs. Graphical abstract
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APPLIED OPTICS
·
2025
·Vol. 64
·期 12
·3250-3254
·
IF 1.7
Bin Tan,Bin Tan,Zhijie Zhang,Zhijie Zhang,Zhenhua Wang,Zhenhua Wang,Wei Xiong,Jingzhou Li,Leimin Deng,Xin Zhan
Quantum dots (QDs) preserve short photoluminescence (PL) lifetime and are widely developed for optical wireless communication (OWC). However, QDs often suffer from surface defects that limit their performance. In this work, we investigate the impact of post-treatment with didodecyldimethylammonium bromide (DDAB) and ${{\rm PbBr}_2}$ on the OWC performance of ${{\rm CsPbBr}_3}$ QDs. The treatment significantly improves the PL properties, leading to an increased quantum yield of 98% and a prolonged PL lifetime of 1.24 times compared to untreated QDs. As a consequence, the ${-}{3}\;{\rm dB}$ bandwidth and maximum data transmission rates under on–off-keying (OOK) modulation are also enhanced, reaching 0.79 and 1.15 times those of pristine QDs, respectively. This improvement highlights the importance of surface passivation for optimizing ${{\rm CsPbBr}_3}$ QDs in OWC applications.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yiyuan Peng,Mengbiao Liang,Ting Chen,Mengdi Zhao,Zhixiang Xie,Chunxian Guo
All-inorganic perovskite nanocrystals (CsPbX 3 NCs, X = Cl, Br, I) have emerged as promising candidates for applications in light-emitting diodes (LEDs), solar cells, photodetectors, and backlight displays, owing to their exceptional optoelectronic properties, including high photoluminescence quantum yield (PLQY), long carrier lifetimes, and narrow emission bandwidths. However, the intrinsic ionic nature of these nanocrystals renders them highly susceptible to environmental degradation, limiting their practical applications. Herein, we report the synthesis of CsPbBr 3 @MOF-5 composites through a physical mixing method: room-temperature supersaturated recrystallization of CsPbBr 3 NCs, followed by encapsulation within a hierarchical porous zinc-based metal-organic framework (MOF-5). By incorporating poly(ethylene oxide)-block-poly(propyleneoxide)-block-poly(ethylene oxide) Pluronic (P123) and 1,3,5-trimethylbenzene (TMB) as structure-directing agents, the pore architecture of MOF-5 was tailored to exhibit hierarchical porosity (2-35 nm), significantly enhancing both the PLQY and stability of CsPbBr 3 NCs. The CsPbBr 3 @MOF-5 composites achieved a remarkable PLQY improvement from 22% to 56%, retained 55% of their initial PL intensity after 60 days of ambient storage, and maintained 65% of PL emission under thermal stress (298-498 K). In contrast, pristine CsPbBr 3 NCs experienced complete quenching under identical conditions. Additionally, the composite exhibited superior resistance to anion exchange when combined with CsPbBr x I 3-x NCs. A white LED (WLED) device fabricated using CsPbBr 3 @MOF-5 composite and K 2 SiF 6 :Mn 2+ (KSF) red phosphor exhibited a luminous efficiency of 20.71 lm/W, a correlated color temperature (CCT) of 5486 K, and a broad color gamut covering 133.3% of the National Television Standards Committee (NTSC) standard, underscoring its potential for advanced lighting and display technologies.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Li-Yuan Wu,Fei Zhang,Ming-Zhe Cai,Min Zhang,Tong-Bu Lu,Ping Li,Yong-Hua Chen
Z-Scheme heterojunctions with strong redox capability and efficient photoinduced carrier separation are critical for sunlight-driven CO2 conversion, yet their optimal structural arrangement remains to be improved. Herein, we report a 2D/2D CsPbBr3/SnS2 nanosheet hybrid system featuring an extensive interfacial contact area that facilitates photoinduced carrier transfer. The inbuilt electric field directs photoinduced electrons to accumulate on CsPbBr3, while holes migrate to SnS2, thereby enhancing their respective redox capabilities. This system achieves a maximum CO rate of 75.6 µmol g−1 h−1, representing a 32.8-fold and 3.5-fold improvement compared to pristine 2D SnS2 and CsPbBr3–OA, respectively. Electrochemical characterization reveals that interlayer hybridization synergistically enhances both interfacial carrier transfer and surface redox ability. The electrostatic assembly approach enables the controlled synthesis of various CsPbBr3/SnS2 composites with tunable SnS2 ratios, providing a generalizable strategy for the precise fabrication of dual crystal facet-exposed catalysts.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Liming Zhang,Zhuang Zhao,Siyu Chen,Wei Chen,Xuying Zhong,Yuehua Peng,Yanling Yin,Jun Liu,Wei Dou,Dongsheng Tang,Weichang Zhou
CsPb 2 Br 5 has attracted a tremendous attention recently owing to its high stability and unusual optical properties. However, the transformation between CsPb 2 Br 5 and CsPbBr 3 has yet been fully understood and the origin of the bright green emission in CsPb 2 Br 5 is still under debate . In this work, we elucidate the mechanism of the abnormal green emission in CsPb 2 Br 5 and reveal the light/heating/humidity induced reversible transformation between CsPb 2 Br 5 and CsPbBr 3 . The detailed structure characterization indicates the successful synthesis of pure phase CsPb 2 Br 5 , which exhibits a non-luminous feature. Remarkably, after the treatment of ultraviolet laser irradiation or annealing, the pure phase CsPb 2 Br 5 can be transformed partially or completely into CsPbBr 3 , yielding an unexpected bright green emission. In addition, the transformed CsPbBr 3 can be converted back to CsPb 2 Br 5 under the humidity environment, demonstrating the reversible transformation and photoluminescence switch. Interestingly, CsPbBr 3 derived from transformed CsPb 2 Br 5 exhibits superior emission properties such as higher photoluminescence stability, compared with the one-spot directly synthesized CsPbBr 3 . Moreover, the light induced transformation facilitates the fabrication of CsPb 2 Br 5 /CsPbBr 3 nano-heterostructure diodes with a high rectification ratio. These results provide an important insight into the photophysics and transformation mechanism of all-inorganic Cs-Pb-Br perovskites for photonics/electronics device applications.
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Journal of Energy Chemistry
·
2024
·
IF 14
Mingxing Li,Xiaoge Wang,Xiaofan Cao,Zhiqun He,Chunjun Liang,Mingxing Chen,Jing Ju,Fangtian You
Lead-halide perovskite nanoparticles (LHP NPs) are highly promising materials for next-generation displays and solid-state lighting due to their exceptional optical properties. However, their inherent instability presents a significant challenge. Recent advances have demonstrated that optoelectronic devices based on monolayer nanoparticle films exhibit both high luminescence efficiency and long-term stability. Our research demonstrates that mobility limitations and anisotropic alignments in CsPbBr 3 nanocube monolayer films are key to their stabilization, hindering spontaneous growth through face-to-face fusion and resulting in the formation of connecting necks in a diagonal direction. Introducing laser irradiation confirmed this by significantly accelerating nanocubes growth, increasing mobility, and enhancing local structural ordering, leading to larger and more regularly shaped nanosheets. Fourier transform infrared spectroscopy and energy dispersive spectroscopy line-scan analyses indicated that laser irradiation did not disrupt the ligand structure. Transmission electron microscopy and correlative cathodoluminescence electron microscopy revealed the effects of post-growth and heterogeneous structures, including enhanced luminescence and inhomogeneous intensity in the nanosheets. These findings deepen the understanding of the post-growth mechanism of monolayer nanoparticles and the structure-emission correlation and highlight the unique role of laser irradiation in directing the formation of well-defined and regular nanostructures.
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