CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Junyang Yin,Feng Wu,Jiangnan Dai,Changqing Chen
Perovskite quantum dots (PQDs) are emerging as promising nanomaterials for optoelectronic applications. However, developing a cost-effective green synthesis process that simultaneously possesses satisfactory photoluminescence quantum yield (PLQY) and stability remains a severe challenge. Here, CsPbBr 3 @PbSO 4 nanocomposites with a near-unity PLQY of 99.8 % and robust ambient stability are synthesized in situ in water via 4-Bromobenzenesulfonic acid and ditetradecylamine ligands. Notably, these nanocomposites show no decline in PLQY even after being immersed in water for over 250 days, and also exhibit superior stability against heating, ultrasonication, UV irradiation, anion exchange, and erosion by polar solvents. First-principles calculations reveal that CsPbBr 3 @PbSO 4 nanocomposites can form a natural quantum well structure, which effectively promotes the radiative recombination of carriers in CsPbBr 3 QDs. Meanwhile, the remarkable stability is attributed to the ultrahigh decomposition enthalpy of PbSO 4 that serves as a strong barrier preventing the invasion of anions and polar media into the embedded CsPbBr 3 QDs. Finally, besides the convenient application of green fluorescent paper, a fingerprint recognition is demonstrated by fabricating a bright-green LED integrated with the CsPbBr 3 @PbSO 4 nanocomposites powder and a commercial UV chip. This work provides a new strategy for green synthesis and practical application of high-efficient and ultrastable PQDs.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
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纳米光学
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半导体物理
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光电材料
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固态化学
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器件物理
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功能材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 48
·17211-17221
·
IF 7.059
Chenyang Wang,Yongjin Long,Xiaohui Liu,Shiqiang Fu,Jiahao Wang,Jing Zhang,Ziyang Hu,Yuejin Zhu
Carbon-based all-inorganic cesium lead bromide (CsPbBr3) halide perovskite solar cells (PSCs) have attracted tremendous attention owing to their low cost, simplified preparation, and outstanding stability even under harsh conditions. However, the CsPbBr3 perovskite always suffers from an undesirable crystallization and film morphology with incomplete coverage and numerous grain boundaries. Herein, a novel dual promotion strategy combining interface modification with ion doping is proposed to achieve highly efficient and stable carbon-based planar CsPbBr3 PSCs. A thin CsBr modified layer was first inserted between the compact TiO2 (c-TiO2) and PbBr2 layers, wherein the crystallization of PbBr2 can be enhanced and then assist the growth of perovskite grains can be provided, so that CsPbBr3 films can reduce pinhole generation and accelerate carrier extraction, and decrease the hysteresis effect. Then an appropriate cobalt (Co2+) ion is doped into the CsPbBr3 film, which not only increases the grain size with decreasing grain boundary, but also ameliorates the energy level and recombination. Consequently, the champion power conversion efficiency (PCE) of the CsPbBr3 PSCs reaches up to 8.67% with an increment of about 30%. Moreover, the best-performing PSC without encapsulation also displays excellent humidity and thermal stability, maintaining above 98% of its initial PCE in an air atmosphere after 100 days, and over 95% under heat treatment at 85 °C after 600 hours, respectively. This study provides a promising route to boost the performance of all-inorganic perovskite solar cells.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
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2025
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IF 2
Yansong Yue,Rong Wu,Qingya Wang,Xiaoya Sun,Zhen Guan,Jing Wei,Hongbo Li,Fangze Liu
Metal halide perovskites have emerged as promising materials for radiation detection due to their outstanding optoelectronic properties. However, practical applications are often limited by surface defects and carrier recombination, which result in delayed charge carrier transit and reduced charge collection efficiency. Here, this study reports the successful fabrication and enhancement of CsPbBr 3 single-crystal (SC) detectors specifically optimized for photon-counting radiation detection. High-quality CsPbBr 3 SCs are grown using a space-confined inverse temperature crystallization method. Detectors fabricated with an asymmetric Au/CsPbBr 3 /Ga structure are successfully detected 5.48 MeV α -particle spectrum from a 241 Am source in photon-counting mode. Surface passivation with phenylethylammonium iodide markedly enhances device performance by forming a 2D perovskite layer, significantly increasing the μ - τ product and improving energy resolution (ER) from 25.6% to 13.2%. Employing transient current analysis allows direct visualization of accelerated charge transport and effective suppression of deep-level defects by surface passivation. Additionally, a simple pulse discrimination algorithm effectively excludes events with low charge collection efficiency, further improving ER without the need for material modification. These findings provide important insights for optimizing perovskite-based radiation detectors.
研究领域:
材料科学
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核物理
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光电子学
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辐射探测技术
✓ 已验证
产品关联
DOI
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.
研究领域:
材料科学
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纳米技术
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能量收集
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电化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 17
·175404
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IF 2.9
Yafei Xu,Cong Yan,Hongfei Liang,Sheng Huang,Ping Feng,Jian Song
Silicon solar cell is the most mature photovoltaic conversion device, and in order to further improve the performance of the device, application of downshifting films has become a research hotspot. In this paper, CsPbBr3 perovskite quantum dot/EVA composite adhesive film was prepared by melting method with CsPbBr3 perovskite quantum dot film under solution processing as masterbatch and EVA particles as excipient. The effect of synthesis conditions on the luminescence properties of the composite films were thoroughly studied. The optimized CsPbBr3 perovskite quantum dot/EVA composite adhesive film has excellent performance, and its light transmission reaches 85%. The CsPbBr3 perovskite quantum dot/EVA composite adhesive film absolutely improves the efficiency of silicon solar cells by 1.08%, which is much higher than that of pure EVA adhesive film (0.63%). In addition, the device efficiencies have almost no change after 30 d in the air, maintaining the working stability of the device and contributing to industrial applications. This study provides a novel, industrial and low-cost synthesis route for the synthesis of CsPbBr3 perovskite quantum dot/EVA composite adhesive film, which is expected to have broad application.
研究领域:
材料科学
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光伏技术
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纳米技术
✓ 已验证
DOI
高影响因子
RARE METALS
·
2025
·Vol. 44
·期 5
·3069-3079
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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
研究领域:
材料科学
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光伏技术
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纳米科技
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表面科学
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半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Chenrun Liu,Ziqi Wu,Peisheng Nong,Qiuting Cai,Xingliang Dai,Bobo Li,Haiping He,Wang Zhang,Mingxia Qiu
Perovskite light-emitting diodes (PeLEDs) have significant potential for display and lighting applications. However, the intrinsic issues such as material stability, efficiency limitation, spectral purity and color gamut challenges have hindered the development process. In this work, the efficient blue light PeLEDs were obtained through multiple modifications of doping strategy and surface passivation. Incorporating NdCl3 into CsPbBr3 perovskite nanocrystals (PeNCs) causes lattice contraction and improves crystallization quality, thereby increasing the photoluminescence quantum yield (PLQY) and reducing non-radiative recombination. Further homogeneous passivation with didodecyl dimethylammonium chloride (DDAC) can effectively fill the halogen vacancies on the surface of PeNCs, thus to reduce surface defects. Ultimately, the PeLEDs achieved a highest external quantum efficiency (EQE) of 15.74% at the emission wavelength of 478 nm. This study can provide important insights into the multi-component regulation of high-performance blue light PeLEDs and build the foundation for their practical application in full-color display.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Honghao Jiao,Yujie Gao,Jianing Guo,Huaiyu Zhang,Mingxing Wu
To enhance the inferior photovoltaic performance of all-inorganic carbon-based perovskite solar cells (C-PSCs) caused by inefficient charge extraction and transport processes of the CsPbBr 3 /carbon back interface, three types of tungsten oxides (WO 3 , WO 2.72 , WO 2 ) are synthesized as low cost and stable hole transport layers (HTLs) to modify the back interface by tunning the energy level alignment. Among the three kinds of tungsten oxides, WO 3 shows the best hole extraction and transport capability and the C-PSCs using WO 3 HTL generates a power conversion efficiency (PCE) of 7.90% with a high open circuit voltage (V oc ) of 1.307 V, indicating a great PCE enhancement of 43.9%, as compared with the device without HTL (5.49%). Meanwhile, WO 2.72 and WO 2 also are also proved to be qualified HTLs and the devices show PCE values of 7.57% and 6.24%, respectively. Importantly, WO 3 and WO 2.72 based device show excellent stabilities with PCE retention over 90% of the initial PCE values under ambient conditions for 60 days.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xue Zhang,Yanyu Cui,Siyuan Ye,Zhuohan Lin,Yan Li
Two-dimensional (2D) CsPbBr 3 nanoplatelets (NPLs) have attracted great attention as one of promising semiconductor nanomaterials due to their large exciton binding energy and narrow emission spectra. However, the labile ionic and weakly bound surfaces of deep-blue emitting CsPbBr 3 NPLs with wide bandgap result in their colloidal instability, thus degrading their optical properties. It is challenging to obtain deep-blue emitting CsPbBr 3 NPLs with excellent optical properties. In this study, high-quality blue-emitting CsPbBr 3 NPLs with tunable thickness were prepared adopting the DBSA-mediated confinement effect based on the hot-injection method. Thanks to the coordination interaction of − SO 3 − of DBSA ligand and the Pb 2+ on the surface of the CsPbBr 3 NPLs, as well as the effective passivation of Br vacancy defects on the surface of NPLs by OAm-Br, the obtained pure-blue CsPbBr 3 NPLs and deep-blue CsPbBr 3 NPLs show high photoluminescence quantum yield (PLQY) of 92 % and 81.2 %, respectively. To the best of our knowledge, this is the highest PLQY recorded for deep-blue emitting CsPbBr 3 NPLs with two monolayers [PbBr 6 ] 4− octahedra. Furthermore, the agglomeration of CsPbBr 3 NPLs due to ligand loss induced by moisture, oxygen, and irradiation was also suppressed by the dual passivation effect of DBSA and OAm-Br. Our work provided a new approach to developing high-performance and stable deep-blue emitting CsPbBr 3 perovskite nanoplatelets.
研究领域:
材料科学
·
纳米技术
·
光电学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 18
·2200683
·
IF 10.05
Huanxin Yang,Rui Yun,Changjiu Sun,Yiyue Chu,Guodong Su,Mingjian Yuan,Suli Wu,Libing Zhang,Xiyan Li
Quasi 2D metal halide perovskite nanoplatelets (NPls), as a kind of important materials to achieve pure blue emission, attract significant attention in pursuit of high gamut trichromatic display. However, in-depth study on the specific growth processes of NPls is still lacking due to the ultrafast reaction rate. Here, a single ligand passivation strategy to investigate the concrete growth mechanism of NPls is proposed, in which the PbBr x (OAm) y clusters play a pivotal template role in guiding the growth of crystals, and the final products with 3-monolayer (3ML) are grown from the intermediate 2ML NPls instead of being synthesized directly. Based on the new discovery about growth mechanism of NPls, the reaction time has been shortened from hours to seconds by introducing hydrobromic acid and ethanol. The ethanol used here is considered as an accelerator for the transition from 2ML to 3ML NPls rather than an initiator for nucleation of products, which is different from the generally accepted viewpoints. With further passivation of hydrobromic acid, the synthesized 3ML NPls show 462 nm emission with quantum yield of 97.04% and great photostability. The novel growth model proposed in this work will provide a paradigm for future design and optimization of new synthesis schemes.
研究领域:
材料科学
·
化学工程
·
光学材料
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Xuyong Tao,Boyan Liu,Guoqing Tong,Hanwen Zhu,Junchun Li,Yuanyuan Sheng,Chengyun Wu,Yajing Chang,Yangqing Wu,Yang Jiang
Ligand exchange has been demonstrated as an efficient strategy to improve the photoluminescence quantum yield (PLQY) and stability of quantum dots (QDs). Long-term illumination can considerably accelerate the ligand desorption after ligand exchange because of the weak bonding between the ligand and QDs. Here, a novel light-driven luminescence evolution strategy in combination with ligand exchange is devised by using N-acetyl-l-cysteine (NAC) as a ligand. NAC is expected to coordinate with the uncoordinated Pb2+ to improve the bonding between NAC and QDs. Light illumination is employed to accelerate the digestive ripening process and realize the uniform distribution of QDs. On the basis of the synergistic effect of NAC ligand exchange and light illumination, the CsPbBr3 QDs show reduced surface defects with nearly 100% PLQY and remarkable stability in polar solvents. Furthermore, a white light-emitting diode is demonstrated with a high rendering index of 80.7 and color temperature of 5595 K.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）