APPLIED OPTICS
·
2021
·Vol. 60
·期 28
·8896-8903
·
IF 1.98
Li Ren,Kunpeng Gao,Qiuhong Tan,Qiuhong Tan,Qiuhong Tan,Chen Qing,Qianjin Wang,Qianjin Wang,Peizhi Yang,Yingkai Liu,Yingkai Liu
All inorganic perovskite materials have drawn extensive attention, owing to their outstanding performance, facile solution-processed method, and potential applications in optoelectronic devices. However, uncontrollable morphology, high defect density, and instability of perovskites prepared via solution-processed method are the main challenges for their large-scale production and commercialization. Herein, we prepared large-scale ${\rm{CsPbB}}{{\rm{r}}_3}$ microwire arrays with highly ordered morphology and high crystalline quality by a template-assisted method. The photodetectors based on ${\rm{CsPbB}}{{\rm{r}}_3}$ microwire arrays exhibited remarkable on/off photocurrent ratio of ${9.02} \times {{1}}{{{0}}^3}$, high detectivity of ${1.59} \times {{1}}{{{0}}^{13}}$ Jones, high responsivity of 4.55 A/W, and fast response speed of 4.9/3 ms. More importantly, the photocurrent of the photodetectors hardly changed in air after being stored for two months, indicating remarkable stability. This study demonstrates that ${\rm{CsPbB}}{{\rm{r}}_3}$ microwire arrays provide the possibility for preparing large-scale and high-performance optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 51
·1904461
·
IF 15.621
Junpeng Zeng,Cuifang Meng,Xiaoming Li,Ye Wu,Shuting Liu,Hai Zhou,Hao Wang,Haibo Zeng
Inorganic halide perovskite (HP)-based photodetectors (PDs) have exhibited fast response speed and high responsivity, but with low detectivity due to the high dark current of devices. Additionally, the intrinsic instability of HPs and interface deterioration originating from ion migration inhibit their practical applications severely. A tunneling organic layer is introduced to solve both these problems. Light-induced charge carriers can flow across the interfacial (poly(methyl methacrylate), PMMA) layer with appropriate thickness via the Fowler–Nordheim tunneling effect. Due to the effective control of dark current, the photo-/dark-current ratio reaches a giant value of 2.13 × 10 8 , and the peak detectivity is as high as 1.24 × 10 13 Jones. With such superiority, light signal as weak as 244 pW is accurately imaged by a PD array. Additionally, the hydrophobic organic layer inhibits the destruction of HPs caused by moisture and ion migration induced interface reaction, and negligible response attenuation is observed during continuous work in a humid environment for 48 h. This heterojunction structure design provides a new strategy to enhance the performance and stability of perovskite-based photoelectric and photovoltaic devices.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Bowang Shu,Yajing Chang,Li Dong,Leilei Chen,Huijuan Wang,Supeng Yang,Jinhua Zhang,Xiaopeng Cheng,Dabin Yu
CsPbBr 3 perovskite quantum dots (PQDs) have drawn much attention for their high photoluminescence quantum yield and great potential in optoelectronic applications. However, they suffer from poor stability under humid condition. This paper reports CsPbBr 3 PQDs incorporated in aluminum stearate (AlSt 3 ) matrix via an improved co-precipitation approach, in which AlSt 3 not only acted as hydrophobic matrix to protect CsPbBr 3 PQDs from surrounding environment, but also passivated the surface of PQDs via the coordination bond of St-Cs and St-Pb, as well as bond between Al 3+ and Br − . By this method, the as-synthesized CsPbBr 3 -AlSt 3 composites exhibited excellent stability in ambient condition even directly in water for more than 60 days. With the CsPbBr 3 -AlSt 3 composites (green emission) used as color-conversion layer, a white light-emitting diode (WLED) was fabricated with a high color rendering index (Ra) of 90 and a low color temperature (Tc) of 4929 K. These results suggest that this method pave an effective way to stabilize CsPbBr 3 PQDs, which is of great importance for their further application.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yuyao Zhang,Wen Chen,Min Zhou,Guobin Miao,Yueli Liu
Photoreduction of CO2 into useable hydrocarbon fuels has been widely used in the energy conversion field. However, the high carrier recombination rate and the low conversion efficiency of as-prepared catalysts greatly restrict their photocatalytic application. Herein, we synthesize Ti3C2/CsPbBr3 quantum dot (Ti3C2/CsPbBr3 QD) composites by the method of self-assembly, which are used in the photoreduction of CO2. As a result, Ti3C2/CsPbBr3 QD composites exhibit excellent photocatalytic activity and stability for the photocatalytic CO2 reduction. Especially, the generation rate of CO (17.98 μmol h–1 g–1) for Ti3C2/CsPbBr3 QD composites is 9.37 times higher than that of CsPbBr3 QDs (1.92 μmol h–1 g–1), and 97.35% of the activity is still retained after three consecutive cycles. The improved photocatalytic performance is mainly attributed to the construction of the type II-2 heterojunction as the built internal electric field (IEF) in the p–n junction could accelerate the separation for both photoinduced holes and electrons. Therefore, this work provides an insight into the construction of heterojunction photocatalysts with halide perovskite QD materials for photocatalytic applications.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhenghai Ou,Yongsheng Yi,Ziting Hu,Jiajie Zhu,Wenzhen Wang,Hua Meng,Xiaozheng Zhang,Shengqi Jing,Shanhu Xu,Feng Hong,Jian Huang,Juan Qin,Fei Xu,Run Xu,Yanyan Zhu,Linjun Wang
The optoelectrical properties of semiconductor devices are strongly related to the film morphology. Here, we found that, for CsPbBr 3 thin films prepared by spray coating, the addition of polymethyl methacrylate (PMMA) can completely eliminate voids and greatly reduce the surface roughness of the as-deposited films. As a consequence, the optoelectronic properties of the photodetectors fabricated as a simple vertical structure of Au/CsPbBr 3 (PMMA)/ITO can be improved. With the addition of PMMA, the dark current of the photodetector is reduced at least four times, and the photodetector exhibits a favourable optical response. With the illumination ranging from 400 to 510 nm, the calculated responsivity varies from 3.70 to 5.20 A/W. A good response speed with a rise time of 6.6 ms and a decay time of 11.3 ms can be achieved. Moreover, unlike the inorganic-organic hybrid perovskite detectors, this inorganic perovskite photodetector without encapsulation shows a favourable stability with a decay of 20% after 40 days under ambient air at 20% humidity.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 32
·24895-24905
·
IF 2.779
Liu Chao,Chen Hang,Lin Ping,Hu Haihua,Meng Qingyu,Xu Lingbo,Wang Peng,Wu Xiaoping,Cui Can
CsPbBr 3 emerges as a representative inorganic perovskite due to its feasible synthesis and outstanding properties. In this work, high-quality orthorhombic and cubic CsPbBr 3 single crystals (SCs) are successfully grown by a modified inverse temperature crystallization method. Current–voltage ( I – V ) and current–time ( I – t ) curves were systematically measured under various biases and light illumination intensities to investigate the correlation between the photoelectrical properties and the crystal structures. Even though the cubic CsPbBr 3 has a larger averaged carrier lifetime than those of the orthorhombic CsPbBr 3 crystal, extremely asymmetry in the I–V curves and abnormal hysteresis behaviors are observed in cubic CsPbBr 3 , and an overshoot followed by a slow decay in the photocurrent becomes more pronounced in cubic CsPbBr 3 as light illumination intensity increases, reflecting the significant effect of ion migration in the photoelectric performance in cubic CsPbBr 3 . On the other hand, the photocurrent in orthorhombic CsPbBr 3 exhibits excellent response ability and stability, showing a large light-to-dark ratio of 15.2, roughly 7 times larger than cubic CsPbBr 3 . The differences in the photoelectrical properties between cubic and orthorhombic CsPbBr 3 provide insights into the influence of crystal structure on the photoelectronic properties of perovskite materials.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Huan Tian,Yi Liu,Feng-Lei Jiang
Perovskite nanocrystals attract growing interest owing to their unique optoelectronic properties. However, their chemical stability is relatively poor due to their ionic nature. In this work, we found that inorganic cations (e.g., Cs+) and ligands (e.g., didodecyldimethylammonium bromide, DDAB), used in the synthesis of CsPbBr3 nanocrystals (NCs) at ambient temperature, quickly converted CsPbBr3 NCs to Cs4PbBr6 NCs during the synthesis or postsynthetic treatment. These cations (Cs+, DDA+) were involved in both the chemical composition and dissociation of CsPbBr3 NCs. Nevertheless, DDA+ induced the generation of an impurity in addition to Cs4PbBr6 NCs due to its different nature from that of Cs+. The transformation process was observed by optical spectroscopy and transmission electron microscopy. The reverse transformation of Cs4PbBr6 NCs to CsPbBr3 NCs can be carried out completely by adding sufficient PbBr2 into Cs4PbBr6 NCs. Therefore, the forward and backward reactions were driven by Cs+ and Pb2+. With additional DDAB for passivation during the reverse transformation, the resulting product possessed a better photoluminescence quantum yield (PLQY, ∼90%) compared with that without the involvement of DDAB (∼69%). By considering the Cs4PbBr6 NCs as the Cs source, the reverse transformation can be analogized to the synthesis of CsPbBr3 NCs, providing a possible strategy for synthesizing luminescent perovskite NCs at room temperature with theoretical stoichiometry.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Lan Ding,Burenbayaer Borjigin,Yuning Li,Xiaoxue Yang,Xiaojing Wang,Huiqin Li
Conversion of CO2 into valuable chemical feedstocks through artificial photosynthesis is an effective strategy to alleviate energy and environmental issues. Herein, we have developed a novel perovskite-based catalyst via in situ growing CsPbBr3 quantum dots (QDs) on the affinal 2D CsPb2Br5 nanosheets for CO2 photoconversion. CsPbBr3 QDs were generated by peeling off layers from their cubic counterpart; meanwhile, CsPb2Br5 nanosheets were formed by heaping up the peeled layers. The resultant dual-phase composite exhibited outstanding activity and selectivity for photocatalytic conversion of gaseous CO2 with a CO generation rate of 197.11 μmol g–1 h–1 under 300 W Xe lamp irradiation, which is 2.5 and 1.1 times higher than that of pure CsPb2Br5 or CsPbBr3. Importantly, the fabricated dual-phase material presented extremely high stability and was able to maintain an unchangeable CO2 conversion rate under wet air in the consecutive 10 h of recycling test. Furthermore, attributing to the in situ assembling strategy, the close contact allowed photo-generated electrons in CsPbBr3 QDs to transfer rapidly to CsPb2Br5, and the affluent active sites in such an architecture enabled achieving enhanced CO2 photoconversion activity. The present work provides an attractive approach for in situ constructing a consubstantial perovskite-based composite photocatalyst to ensure great stability and excellent activity for artificial photocatalytic CO2 conversion.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2021
·Vol. 11
·期 8
·953
·
IF 2.881
Hongyu Chen,Yunfei Wang,Jianing Wang,Wenyan Liu
Nowadays, the excellent performance of metal halide perovskite quantum dots (PQDs) has been demonstrated, but the stability is still a perplexing issue. In this paper, the CsPbBr3QDs were assembled into SBA-15 for the first time. The thermal stability and photoluminescence (PL) intensity of SBA-15@CsPbBr3QDs were improved. The PL spectra of pure CsPbBr3QDs have red-shift (~6 nm) with the increasing temperature. However, that of SBA-15@CsPbBr3QDs have almost no red-shift. The PL intensity of SBA-15@CsPbBr3QDs decreased slightly after heating and cooling for several times. By comparison, the PL intensity of pure CsPbBr3QDs decreased more significantly. The experimental results showed that SBA-15 played a significant role in improving the thermal stability of PQDs, which will have an excellent potential for the application of PQDs in the future.Keywords:CsPbBr3QDs;SBA-15;thermal stability
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Haochen Zhou,Mengbiao Liang,Ting Chen,Yiyuan Peng,Wenkui Wu,Youpeng Li,Mengdi Zhao,Chunxian Guo,Zhixiang Xie
All-inorganic perovskite nanocrystals (NCs) offer excellent optoelectronic properties but suffer from poor stability under environmental factors such as water, oxygen, and heat, which limits their broader applications. To address this, we developed a two-stage heating method to synthesize cruciform CsPbBr3 NCs, followed by embedding them in a silica matrix to enhance both fluorescence and stability. The CsPbBr3 NCs measured 30.5 nm in length and 28.5 nm in width. Coating with SiO2, derived from 3-aminopropyl triethoxysilane (APTES) with an APTES/Pb molar ratio of 2.0, increased the photoluminescent quantum yield (PLQY) from 65% to 87%. The CsPbBr3@SiO2 composite retained 27% of its fluorescence after 210 min in ethanol, while the pristine CsPbBr3 NCs were almost fully quenched. After storage in water for 24 h, the PL intensity was 43.5% for the CsPbBr3@SiO2 composite and 3.6% for uncoated NCs. At 398 K, the composite retained 31% of its PL while uncoated NCs were nearly fully quenched. The CsPbBr3@SiO2-based white-light-emitting diode (WLED) exhibited a color rendering index (CRI) of 40.4, a correlated color temperature (CCT) of 5218 K, and a luminous efficiency of 35 lm/W, covering 134.5% of the NTSC color gamut, demonstrating excellent potential in WLED applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA SCRIPTA
·
2024
·Vol. 99
·期 8
·085986
·
IF 2.6
Yajuan Wang,Jianing Wang,Lei Wang,Shuonan Wang,Wenyan Liu
All inorganic CsPbBr3 nanocrystals (NCs) have gained significant attention due to their potential as light-emitting diodes, solar cells and other optoelectronic devices. However, to a certain extent, the stability issues of CsPbBr3 NCs under water, light, and thermal conditions limit their further applications. In order to improve stability, this article proposes a strategy of modifying CsPbBr3 NCs with poly(ethylene adipate) (PEA). The surface passivation of macromolecular polymer PEA not only increases the distance between NCs which inhibits the aggregation of small NCs, but also provides a dense protective layer to protect NCs from corrosion by water, air and light. Therefore, the performance of PEA-modified CsPbBr3 NCs in terms of optical properties and stability is significantly improved. The photoluminescence intensity of PEA-modified CsPbBr3 NCs remains at about 40% of the initial intensity when heated to 100 °C, while that of pure CsPbBr3 NCs has decreased to less than 10%. The photoluminescence intensity of PEA-modified CsPbBr3 NCs decreased to 83% of the initial intensity after 7 cycles of heating to 100 °C and then cooling to room temperature, while that of pure CsPbBr3 NCs decreased to 13%. Meanwhile, the PL intensity of PEA-modified CsPbBr3 NCs remained at 66% of the initial intensity after 10 h under 365 nm ultraviolet light, and there is no obvious red shift in PL spectra, while the PL intensity of pure CsPbBr3 NCs only maintained 21% of the initial intensity, accompanied by obvious red shift in PL spectra. The results show that the PEA-modified CsPbBr3 NCs have a positive effect on stability.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Ziwei Sun,Yong Wang,Ye Liu,Ruliang Liu,Tao Chen,Shuming Ye,Niu Lai,Haoyang Cui,Feng Lin,Rongfei Wang,Jie Yang,Shaoying Ke,Chong Wang
All-inorganic perovskite materials have gained enormous attention in photodetectors (PDs) due to their high charge carrier mobility, cost-effectiveness, and tunable bandgap. However, instability and corresponding performance degradation of perovskite PDs when exposed to surrounding humidity persist as challenges. In this work, a composite PD was fabricated by combining CsPb2Br5 nanowires and CsPbBr3 thin-film perovskites as an example to address these problems. The CsPb2Br5 nanowires were prepared by a facile water-bath method to improve the water resistance, and the subsequent evaporation of the CsPbBr3 film formed a type-I heterostructure to enhance its photosensitivity of PDs. As a result, the device exhibits a 10 times higher responsivity of 206 mA/W than that of the bare CsPbBr3 thin film device and maintains 92.85% of its original detectivity after being exposed to a humid environment (RH = 75%) for 144 h. Furthermore, the corresponding fundamental characterization was also performed to reveal the role of CsPb2Br5 nanowires in enhancing the overall performance of the PD. This work provides a simple and efficient approach to enhancing the durability and performance of all-inorganic halide perovskite devices through the embedding of CsPb2Br5 perovskite nanowires.
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
危险品化学品经营许可证（带存储）