JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Cong Xie,Jinchan He,Yuanna Zhu,Ling Chen,Ping Yang
CsPbBr 3 nanoplatelets (NPLs) have been considered as a promising candidate in the field of blue-emitting because of large exciton binding energies, thickness-tunable emission and excellent charge-transfer properties. In this paper, the effect of ligand concentration, solvent polarity, and ligand hydrocarbon chain on the photoluminescence (PL) and morphology properties of NPLs were studied. The PL properties of the NPLs depended strongly on the thickness which was controlled by ligands. The thickness of NPLs increased with increasing the amount of oleylamine. In contrast, the addition amount of oleic acid did not affect the PL properties of the NPLs. In addition, the thickness of NPLs becomes thinner with shortening carbon chain. Furthermore, the polarity of solvent ( n -hexane instead of toluene) played an important role in the thickness of NPLs. The higher polarity of toluene induces the preparation of thicker NPLs. These results contribute to the further study of the formation mechanism of perovskite NPLs and promote the application of NPLs in the field of optoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2017
·Vol. 6
·期 2
·1700864
·
IF 6.875
Qingsong Hu,Zha Li,Zhifang Tan,Huaibing Song,Cong Ge,Guangda Niu,Jiantao Han,Jiang Tang
Rare earth ions Eu 3+ and Tb 3+ are doped into CsPbBr 3 nanocrystals (NCs) for the first time, utilizing a one-pot ultrasonication method. As-synthesized NCs exhibit dual emissions from NCs and rare earth ions, further strengthening the competitiveness of perovskite NCs for lighting application.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lei Wang,Decao Ma,Chun Guo,Xin Jiang,Mingliang Li,Tingting Xu,Jinpeng Zhu,Bingbing Fan,Wen Liu,Gang Shao,Hongliang Xu,Hailong Wang,Rui Zhang,Hongxia Lu
All-inorganic halide perovskite nanocrystals (NCs) are generally prepared by liquid phase method with the help of volatile organic solvents, inert gas protection and complex organometallic precursors. Herein, a simple, efficient and green method based on all-solid-state mechanochemical synthesis is proposed to prepare CsPbBr 3 NCs. NCs with excellent performance can be prepared by grinding raw materials CsBr and PbBr 2 through high energy ball milling, and prepared NCs show good stability in ethanol and living conditions. Interestingly, CsPbBr 3 NCs prepared by ball milling have a sudden increase in their fluorescence intensity dispersed in water. After soaking for 8 h, CsPbBr 3 NCs have been almost entirely transformed into CsPb 2 Br 5 NCs. The fluorescence intensity of samples is 80 times of that before soaking, and absolute PL quantum yield (PLQY) of samples increases significantly by up to 92%. These results provide a strong evidence for the current debate about whether CsPb 2 Br 5 emits light and propose a deeper understanding about structural transition from orthorhombic CsPbBr 3 to tetragonal CsPb 2 Br 5 , which is of great significance to the application of CsPb 2 Br 5 in optoelectronic devices. This will provide a new idea for the synthesis and transformation of halide perovskites.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2022
·
IF 1.438
Zhenyang Yao,Yali Yin,Yu Xia,Haitao Chen
All-inorganic halide perovskite (CsPbX 3 ) is a photoelectric material with great potential. However, the Pb element in CsPbX 3 is toxic, which affects the further use of these materials. The toxicity problem can be solved by adding Zn ions into CsPbBr 3 . In this work, Zn-doped cesium lead bromide perovskites (CsPbBr 3 ) nanocrystals (NCs) were synthesized by thermal injection method, and their optical properties were also studied. When Zn was introduced into CsPbBr 3 , its exciton emission summit shifts slightly. By changing the concentration of Zn 2 + , the size and optical properties of Zn:CsPbBr 3 NCs can be controlled. We also study the decay lifetime of its emission peak, and the results showed that Zn:CsPbBr 3 had a longer PL decay lifetime than undoped CsPbBr 3 . This indicated that the incorporation of CsPbBr 3 into Zn 2 + had a good application prospect in the optical field.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Li Zou,Xiaoyan Li,Meili Yang,Jiahao Yan,Jiaming Wang,Jiajie Cheng,Jie Xing,Hao Liu,Huiying Hao,Jingjing Dong
Carbon-based, all-inorganic CsPbBr 3 perovskite solar cells (PSCs) have attracted considerable interests because of their superior environmental stability, simple and low-cost fabrication process. However, the large energy barrier and high defect states at the CsPbBr 3 /Carbon interface will cause poor carrier extraction and serious carrier recombination, which further degrade performance of final devices. In this work, we introduce zinc phthalocyanine (ZnPc), CsPbBr 3 quantum dots (QDs), and ZnPc mixed CsPbBr 3 QDs in proper proportion as the CsPbBr 3 /carbon interface modification layers of CsPbBr 3 PSCs. It is found that the modification layers, especially the ZnPc mixed CsPbBr 3 QDs modification layer, can passivate trap states, improve interface contact and optimize energy level alignment at the CsPbBr 3 /carbon interface, which can further enhance carrier extraction, suppress carrier recombination and improve performance of final devices. By virtue of ZnPc mixed CsPbBr 3 QDs modification, a highest efficiency of 10.20% and long-term stability over 6 months has been achieved.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhenwei Zhang,Junkai Zhang,Yixing Zhao,Yanli Wan,Sen Li,Yingwen Tang,Tao Li,Tingfang Tian,Li Wang
All-inorganic halide perovskite quantum dots are widely known to suffer luminescence degradation owing to their intrinsic instability in atmospheric circumstances. Their high surface energy and weak internal ionic bonding could result in quantum dot agglomeration and structural degradation. In this work, we demonstrate that triallylamine is an efficient recovery agent to reignite the luminescence emission of aged CsPbBr 3 quantum dots. The aged CsPbBr 3 quantum dots re-emit bright green light instantly after triallylamine etching. The X-ray photoelectron spectroscopy results indicate a noticeable decrease of surface under-coordinated Pb ions content, leading to surface re-healing and photoluminescence quantum yields increasing. The unique emission recovery could reveal the details of CsPbBr 3 quantum dot surface variety and facilitate the development of perovskite quantum dot display devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA SCRIPTA
·
2025
·Vol. 100
·期 3
·035954
·
IF 2.6
Lairong Yan,Penghui Ren,Jianping Yang,Zhenxuan Ding,Hao Hu,Guoqiang Zhang,Yanbin Zhang,Ping Lin,Lingbo Xu,Peng Wang,Can Cui
Perovskite-based semiconductor photodetectors have attracted wide attention in the photoelectric fields. By local MoO3 induction, MoO3:CsPbBr3−CsPbBr3 homojunction photodetector was constructed by chemical vapor deposition, exhibiting not only excellent response speed in the scale of microsecond, but also high responsivity of 247.1 A W−1 and detectivity (8.7 × 1012 Jones), roughly an order of magnitude higher than that of CsPbBr3 devices. Ultraviolet photoelectron spectroscopy measurements show that the Fermi level moves closer to the top of the valence band due to the local MoO3 induction, leading to the conversion of weak p-type CsPbBr3 to a strong p-type semiconductor, which is consistent with the calculation result based on density functional theory (DFT). The band alignment in the homojunction accelerates the photo-generated carrier separation and transfer, thus improving the photoelectric performance of MoO3:CsPbBr3−CsPbBr3 homojunction. Our results provide a new strategy to design photodetectors with excellent performance by constructing homojunctions with perovskite on different substrates.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yuehong Yin,Yukun Liu,Guohua Cao,Zhaoyue Lv,Haitao Zong,Yujie Cheng,Qifan Dong,Chen Liu,Ming Li,Baoqing Zhang
The Cs-Pb-Br system possesses excellent optical properties and unique phase transition characteristics due to soft lattice structures. Herein, a simple and green synthetic method based on self-assembly in Dimethyl formamide (DMF) is proposed to prepare CsPb 2 Br 5 nanocrystals (NCs) with typical tetragonal structure, which exhibit orange emission and small size around 3.87 nm. Interestingly, the phase transition from CsPb 2 Br 5 to CsPbBr 3 occurs easily in DMF through mechanical induction, while the metastable mixed-phase structural CsPbBr 3 NCs with an average size of about 5 nm appear and show bright yellow emission. Afterwards, in combination with the supersaturation crystallization method, stable cubic CsPbBr 3 NCs with 13 nm size are obtained and display the effective green emission. The synthesized CsPb 2 Br 5 and steady-state CsPbBr 3 NCs exhibit good optical stability in solution, while the metastable CsPbBr 3 NCs undergo a change in emission from yellow to green with increasing time.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 13
·6586-6591
·
IF 7.79
Jianhua Shen,Yu Wang,Yihua Zhu,Yiqin Gong,Chunzhong Li
Metal halide perovskites show abundant photophysical properties and great potential in photovoltaic and electroluminescence devices, but their poor stability is an obvious shortcoming. Here, we successfully synthesized polymer-coated CsPbBr3 quantum dots (QDs) grown in situ on a template. Conjugated linoleic acid (CLA) is used as a ligand to passivate the surface defects of QDs. QDs can be used as photoinitiators in polymerization to initiate CLA crosslinking under illumination, thereby forming polymer coatings to improve the stability of QDs. The mesoporous silica microspheres are used as templates to make CsPbBr3 QDs grow in situ in the pores and avoid the size growth and agglomeration of QDs. The obtained composite material has a narrow full width at half maximum and an absolute photoluminescence quantum yield of 79.16%. Due to the protection of the hydrophobic polymer layer, it can still maintain 77% of the photoluminescence intensity after soaking in water for a week.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Energies
·
2023
·Vol. 16
·期 18
·6426
·
IF 3.2
Jiajie Cheng,Jiahao Yan,Jiaming Wang,Yufan Jiang,Jie Xing,Hao Liu,Huiying Hao,Jingjing Dong
An increasing number of researchers are interested in studying CsPbBr3perovskite solar cells (PSCs) due to their high stability. However, the use of methanol during the spin-coating process is extremely hazardous, both to humans and the environment. CsBr is very soluble in water, but owing to its high specific heat capacity, water causes uneven crystallization and the creation of pores, which negatively impact the performance of CsPbBr3devices. In this paper, water is introduced as the solvent for CsBr in place of methanol to prepare CsPbBr3films and ethanol is used as the surface treatment solvent. The morphology and crystal quality of CsPbBr3films are improved by varying the concentration and spin-coating cycles of the CsBr/H2O solution and adding ethanol post-treatment. The results show that high-quality CsPbBr3films with reduced grain boundaries and high phase-purity were obtained by spin-coating 100 mg/mL CsBr/H2O solution three times and using ethanol as a post-treatment. The CsPbBr3solar cells yielded a maximum efficiency of 7.65% and demonstrate long-term stability over 1100 h.Keywords:perovskite solar cells;CsPbBr3;green solvent;post-treatment
研究领域:
材料科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xuandong Wang,Jie He,Liang Mao,Xiaoyan Cai,Chuanzhi Sun,Mingshan Zhu
Photocatalytic CO 2 conversion to valuable fossil fuels has been demonstrated to be a promising approach to reduce emissions of CO 2 and produce renewable energy, which primarily depends on developing the high efficiency of charge separation photocatalysts. Herein, CsPbBr 3 , one typical kind of all-inorganic perovskite nanocrystal, is immobilized on monolayer MoS 2 nanosheets to construct a new and ideal CsPbBr 3 /MoS 2 photocatalyst in the application of CO 2 photoreduction. In comparison with pure CsPbBr 3 , CsPbBr 3 /MoS 2 heterostructures possessed a specific electric field to more efficiently separate charges and generated more active sites for facilitating CO 2 activation, resulting in 3.0 and 2.4 times yields for CO 2 photoreduction to CH 4 and CO, respectively. Detailed characterization methods such as photoluminescence, surface photovoltage spectroscopy and theory calculations indicate the vivid illustrations of photogenerated carries separation which contributes to improving photocatalytic CO 2 conversion efficiency. The present investigation is anticipated to provide a new way for fabricating highly efficient perovskite-based photocatalyst in solar-energy-driven applications.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nuclear Science and Techniques
·
2022
·Vol. 33
·期 8
·1-11
·
IF 2.389
Lü Zhi-Wei,Wei Gong-Xiang,Wang Han-Qiu,Guan Yu,Jiang Ning,Liu Yun-Yan,Li Zhao,Qin Hua,Liu Hui-Qiang
The evolution of lead halide perovskites used for X-ray imaging scintillators has been facilitated by the development of solution-processable semiconductors characterized by large-area, flexible, fast photoresponse. The stability and durability of these new perovskites are insufficient to achieve extended computed tomography scanning times with hard X-rays. In this study, we fabricated a self-assembled CsPbBr 3 -based scintillator film with a flexible large-area uniform thickness using a new room-temperature solution-processable method. The sensitivity and responsivity of X-ray photon conversion were quantitatively measured and showed a good linear response relationship suitable for X-ray imaging. We also demonstrated, for the first time, that the self-assembled CsPbBr 3 -based scintillator has good stability for hard X-ray microtomography. Therefore, such an inexpensive solution-processed semiconductor easily prepared at room temperature can be used as a hard X-ray scintillator and equipped with flexible CsPbBr 3 -based X-ray detectors. It has great potential in three-dimensional high-resolution phase-contrast X-ray-imaging applications in biomedicine and material science because of its heavy Pb and Br atoms.
研究领域:
材料科学
·
医学影像
·
半导体技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）