OPTICAL MATERIALS
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2024
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IF 3.8
Wangchao Wan,Jindou Shi,Chen Zhang,Zheyuan Da,Junnan Wang,Qing Yao,Youlong Xu,Minqiang Wang
Thin films of organic halogenated perovskite MAPbX 3 (X = Cl, Br, I or mixed, CH 3 NH 3 = MA) display exceptional optical and electronic properties, rendering them highly promising materials for next-generation optoelectronics. However, achieving a large, thin, and smooth film poses a considerable challenge. Compared with the traditional spraying method, the atomized deposition method is able to break down the precursor solution molecules in the atomization system, and this method produces films with thinner thicknesses(800–1000 nm), smoother surfaces, high light transmittance and low surface roughness. By investigating the deposition time, annealing temperature, and film stability associated with the atomized deposition technique, we determined the optimal process parameters for producing nanometer-thick perovskite films. Specifically, we set the precursor solution concentration to 0.1 mmol/L, the deposition time to 450 s, added PVDF (polyvinylidene fluoride) colloid at a concentration of 3 wt%, and maintained an annealing temperature of 80 °C for 20 min. Ultimately, perovskite films with tunable bandgap were prepared for anti-counterfeit marking applications. This method of preparing perovskite films represents a significant advancement towards their commercial utilization in the realm of optoelectronic materials.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 30
·16201-16211
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IF 11.9
Haibin Li,Ziming Zhang,Wei Jiang,Chen Zhao,Haipeng Di,Jiwei Ren,Bing Ou,Ying Xiong,Feiyi Liao,Yiying Zhao
Defects and the ion migration in perovskite single crystals seriously degrade the performance of corresponding devices, regardless of the outstanding optoelectronic properties. In this work, we demonstrated that the ion migration and the defect density in MAPbX3 perovskite single crystals can be suppressed via lowering the growth temperature to 4 °C (LT) of the liquid-diffusion induced crystallization method (LDSC). The MAPbBr3 single crystals grown with the LT-LDSC method demonstrated a full-width at half-maximum (FWHM) of the (100) X-ray rocking curves of 0.0104°, a fluorescence lifetime of 1090 ns, a trap state density of 3.03 × 109 cm−3, an ionic activation energy of 0.52 eV, and a μτ product of 3.22 × 10−2 cm2 V−1. The low defect density and the weak ion migration in MAPbX3 single crystals lead to good X-ray detection performance under higher bias voltage. The X-ray detector has a high sensitivity of 409 μC Gyair−1 cm−2 at a high bias voltage of −40 V, which is the highest bias voltage of this single crystal radiation detector. This method of low temperature growth is instructive to the study of the whole crystal growth.
研究领域:
材料科学
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光学工程
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辐射探测技术
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2020
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IF 4.3
Qun Wang,Ming Ma,Xiaohong Wu,Wei Qin
Understanding carrier dynamic behavior including carrier lifetime and concentration, electrochemical behavior and band structure of the MAPbX 3 (X = I, Br) with high crystal quality are important for improving photocatalytic applications. Herein, a facile isopropanol-assisted solvothermal strategy was demonstrated for highly yielding synthesis MAPbX 3 (X = I, Br) cubic microcrystals with high crystallinity for degrading water insoluble dyes in an organic solvent system. Supported by time-dependent morphology evolution experimental evidence, a high temperature gradient inside the solution leads to natural convection which can induce the screw dislocation in microcrystals. The XRD, IR, steady-state photoluminescence (PL) spectra, fluorescence lifetimes UV–vis spectra and electrochemical tests were investigated to found a direct correlation between crystal quality (crystallinity and defects) and optical properties (PL intensity and bandgap). Importantly, MAPbBr 3 displayed almost an order of magnitude more efficient photocatalytic degradation of malachite green (MG) dye in isopropanol solvent relative to those of MAPbI 3 , which was ascribed to good stability and superior photoinduced electron transfer for molecular oxygen activation.
研究领域:
材料科学
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化学
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光催化
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DOI
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 34
·期 9
·2108408
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IF 30.849
Xiaobao Xu,Zeyao Han,Yousheng Zou,Junyu Li,Yu Gu,Dawei Hu,Yin He,Jiaxin Liu,Dejian Yu,Fei Cao,Haibo Zeng
Miniaturized multispectral detectors are urgently desired given the unprecedented prosperity of smart optoelectronic chips for integrated functions including communication, imaging, scientific analysis, etc. However, multispectral detectors require complicated prism optics or interference/interferometric filters for spectral recognition, which hampers the miniaturization and their subsequent integration in photonic integrated circuits. In this work, inspired by the advance of computational imaging, optical-component-free miniaturized multispectral detector on 4 mm gradient bandgap MAPbX 3 microwire with a diameter of 30 µm, is reported. With accurate composition engineering, halide ions in MAPbX 3 microwire vary from Cl to I giving in the gradual variation of optical bandgap from 2.96 to 1.68 eV along axis. The sensing units on MAPbX 3 microwire offer the response edge ranging from 450 to 790 nm with the responsivity over 20 mA W −1 , −3dB width over 450 Hz, LDR of ≈60 dB, and a noise current less than ≈1.4 × 10 −12 A Hz −0.5 . As a result, the derived miniaturized detector achieves the function of multispectral sensing and discrimination with spectral resolution of ≈25 nm and mismatch of ≈10 nm. Finally, the proof-of-concept colorful imaging is successfully conducted with the miniaturized multispectral detector to further confirm its application in spectral recognition.
研究领域:
光电技术
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光子学
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材料科学
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成像技术
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2023
·Vol. 39
·期 4
·654-659
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IF 3.1
Zhu Xia,An Jiakun,Chen Gaoyu,Xing Chenyu,Bao Jianchun,Xu Xiangxing
Perovskite single crystals are prominent semiconductor materials due to their high carrier mobility, long carrier diffusion length, and large absorption coefficient. They can be used as optoelectronic functional materials for narrowband or broadband photodetectors. In this report, the photodetection band tunability was achieved by doping MAPbX 3 (MA=methylammonium, X=Cl/Br/I) perovskite single crystals with sub-nano carbon dots (MAPbX 3 -C). The sub-nano size and good dispersibility of the carbon dots ensured controllable doping. The absorption of the sub-nano carbon dots and trap states in the MAPbX 3 -C single crystals resulted in the special responsivity spectrum features.
研究领域:
材料科学
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光电子学
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半导体物理
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纳米技术
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光子学
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DOI
高影响因子
ACS Applied Electronic Materials
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2022
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IF 4.494
Ziming Zhang,Haibin Li,Haipeng Di,Dong Liu,Wei Jiang,Jiwei Ren,Zhengfang Fan,Feiyi Liao,Lin Lei,Gaocai Li,Ying Xiong,Yiying Zhao
The crystal quality limits the mobility-lifetime (μτ) product and the further applications of perovskite single crystals (PSC) in high energy radiation detections regardless of their high attenuation coefficient. In this paper, high-quality and controllable growth of MAPbX3 PSCs is demonstrated using the liquid-diffusion induced crystallization (LDSC) method. The growth kinetics are modeled to demonstrate the feasibility of the controllable growth via keeping the growth in the mass-transport-limited regime. The crystal growth rate is confirmed theoretically and experimentally to be constant and solely dependent on the growth temperature. A facile method is developed to measure the growth rate without disturbing or suspending the whole process. MAPbBr3 PSC grown at the optimal condition demonstrates a full-width at half-maximum of the (100) X-ray rocking curves of 0.0096°, a fluorescence lifetime of 1099 ns, a trap density of 4.5 × 109 cm–3, and a μτ product of 1.495 × 10–2 cm2 V–1. The resulting MAPbBr3 X-ray detector has a sensitivity of 2181 μC Gyair–1 cm–2. All results indicate that the controllable growth is beneficial to the crystal qualities and device performances. The concept proposed here will be inspiring for the community of researchers of perovskite materials.
研究领域:
材料科学
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辐射探测技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yun Tang,Ben Liu,Hudie Yuan,Yalou Xin,Xiaohu Ren,Qiang Chen,Hongfeng Yin
The development of functionalized polymer-based filament enables the fused deposition modeling (FDM) 3D-printed materials or structures with a wide range of unique functions. This work explores the use of MAPbX 3 (MA = CH 3 NH 3 , X = Cl, Br, I or mixture of them) perovskite quantum dots (PQDs) by harnessing their unique optical properties for the development of fluorescent 3D printing filaments. Firstly, a one-pot strategy for scalable synthesis of MAPbX 3 PQDs-polycaprolactone (PCL) composite was proposed by in situ formation of PQDs in PCL matrix. To demonstrate the ability for the obtained PQDs-PCL composites to fabricate fluorescent filaments, the effects of filament functionalization on optical properties of PQDs, as well as thermal and mechanical properties of polymer matrix were then comprehensively studied. Owing to the good protective capability of PCL, the synthesized PQDs-PCL composites exhibit comparable PLQY and enhanced UV, water and thermal stability compared to that of pure PQDs. Moreover, high concentration of embedded PQDs in PQDs-PCL composites was obtained with decreasing amount of PCL. The aggregation of PQDs at high temperature combined with the poor interaction between PQDs and surrounding PCL matrix led to the decreased thermal transition temperature and reduced mechanical properties in PQDs-PCL composites relative to pure PCL. The glass transition temperature was found to decrease by 5.5 °C, while the mode of failure changed from plastic fracture for pure PCL to brittle fracture for the highest concentration of PQDs in PCL tested. Consequently, PQD-PCL composites were further processed into fluorescent filaments and further fluorescent objects or structures via 3D printing. Green LED and white LED devices were realized by the combination of UV LED chip with 3D printed MAPbBr 3 PQD-PCL thin-film, and blue LED chip with MAPbBr 3 PQD-PCL thin-film and K 2 SiF 6 :Mn 4+ phosphor, respectively, demonstrating that the PQDs-functionalized 3D printing filaments have great potential in fields of optoelectronic application .
研究领域:
材料科学
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高分子化学
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纳米光学
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增材制造
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光电功能材料
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 4
·2208841
·
IF 19.924
Jinshuai Zhang,Chun Li,Yin Liang,Jiepeng Song,Qiuyu Shang,Liyun Zhao,Huifeng Tian,Lei Liu,Qing Zhang
Suspended nano/microstructures on semiconductor surfaces that can manage light are attractive for various on-chip and efficiency-enhanced optoelectronics. Hybrid halide perovskites have shown considerable potential for optoelectronic and photonic applications. However, the ionic and soft lattices of perovskites are sensitive to polar solvents, photons, and heat, limiting the post-processing of suspended microstructures. Herein, a solution-processed selective area homoepitaxial growth (SAEG) method is introduced to create well-ordered, suspended microstructure arrays on the surface of MAPbX 3 (X = Br, Cl) single-crystalline thin films. The suspended micro-arrays exhibit single crystalline structures and 11.2 fold photoluminescence enhancement compared to the thin-film substrates. The success of SAEG lies in the making use of perovskite supersaturated HX aqueous solutions that not only repair surface defects induced by lithography but also satisfy homoepitaxial growth kinetics. This study paves a pathway for the fabrication of cost-effective perovskite surface-suspended microstructures for efficiency-enhanced and on-chip optoelectronic devices.
研究领域:
材料科学
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光学
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半导体技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Yubing Xu,Xin Wang,Shilin Liu,Yuzhu Pan,Abida Perveen,Damian Chinedu Onwudiwe,Omolola Esther Fayemi,Elias Emeka Elemike,Byung Seong Bae,Ying Zhu,Razika Zair Talaighil,Xiaobing Zhang,Jing Chen,Zhiwei Zhao,Qing Li,Wei Lei,Xiaobao Xu
Sensitive thermometry or thermography by responding to blackbody radiation is urgently desired in the intelligent information life, including scientific research, medical diagnosis, remote sensing, defense, etc. Even though thermography techniques based on infrared sensing have undergone unprecedented development, the poor compatibility with common optical components and the high diffraction limit impose an impediment to their integration into the established photonic integrated circuit or the realization of high-spatial-resolution and high-thermal-resolution imaging. In this work, we present a sensitive temperature-dependent visible photon detection in Bi-doped MAPbX3 (X = Cl, Br, and I) and employ it for uncooled thermography. Systematic measurements reveal that the Bi dopant introduces trap states in MAPbX3, thermal energy facilitates the carriers jumping from trap states to the conduction band, while the vacancies of trap states ensure the sequential absorption of visible photons with energy less than the band gap. Subsequently, the change of response toward the visible photon is applied to construct the thermograph, and it possesses a specific sensitivity of 2.11% K–1 along temperature variation. As a result, our thermograph presents a temperature resolution of 0.21 nA K–1, a high responsivity of 2.06 mA W–1, and a high detectivity of 2.08 × 109 Jones at room temperature. Furthermore, remote thermal imaging is successfully achieved with our thermograph.
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DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
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IF 3.4
Kai Liu,Qingyi Zhang,Chengwei Wang,Lei Wang,Feng Chen
Organic–inorganic lead halide perovskite (MAPbX3, X = Cl, Br, I) single crystals exhibit superior optoelectrical and physical characteristics and have been developed in various optical and electrical applications. However, the poor stability against moisture and light remains the most critical demerit of perovskite materials. In this work, light- and waterproof MAPbBr3-MAPbBr3@PbBr(OH) core–shell single crystals were successfully synthesized by surface engineering-induced transformation from MAPbBr3 to MAPbBr3@PbBr(OH). In addition, an in situ electrode preparation method was developed to construct the Ag/MAPbBr3-MAPbBr3@PbBr(OH)/Ag structure during the crystal growing process. The thickness-adjustable MAPbBr3@PbBr(OH) shell can present dual shielding effects and not only sustains the MAPbBr3 single crystal core with the highest responsivity of 31 mA W1–, response time ∼47 ms, and a detection rate of 4.8 × 1011 Jones but also achieves the embedded MAPbBr3 nanocrystal with bright photoluminescence (quantum yield of 56.1%). Moreover, the similar MAPbCl3-MAPbBrnCl3–n@PbBr(OH) and MAPbI3-MAPbBrnI3–n@PbBr(OH) core–shell single crystals have been prepared, which also exhibit excellent photoresponsivity and high emission. This work provides an effective strategy for the fabrication of high-performance and environmentally stable photodetectors.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
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