INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Tian Xing,Jiawei Wang,Jiayu Zhang,Hao Liu,Lijie Xu,Wen Zhang,Ruijin Hong,Chunxian Tao,Qi Wang,Hui Lin,Zhaoxia Han,Dawei Zhang
Ag 2 O-Ag/CH 3 NH 3 PbBr 3 (MAPbBr 3 ) heterojunction composites were synthesized using a strategy that combines one-step spin coating, electron beam evaporation, and laser irradiation. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analyses confirmed the formation of dense and uniform nanoparticles on the sample surface after laser irradiation, as well as the successful introduction of oxygen vacancies. These nanostructures and oxygen defects contribute to the emergence of a broad plasmonic resonance absorption peak and enhance the local electromagnetic field intensity, thereby promoting stronger nonlinear optical effects. Z -scan results show that the Ag 2 O-Ag/MAPbBr 3 heterojunction composites exhibit strong saturable absorption (SA), in contrast to monolayer Ag 2 O–Ag or MAPbBr 3 , due to efficient interfacial charge transfer that suppresses reverse saturable absorption (RSA) arising from excited-state absorption and multiphoton absorption. The nonlinear optical absorption was effectively tuned by laser irradiation with different pulse widths. The maximum third-order nonlinear absorption coefficient of the heterojunction was measured to be −7.96 × 10 −7 cm/W. In addition, the finite-difference time-domain (FDTD) simulation results were in good agreement with the experimental data. These results indicate that the as-synthesized Ag 2 O-Ag/MAPbBr 3 heterojunction composites have promising potential for applications in nonlinear optical devices.
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高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 24
·2041
·
IF 4.4
Yi Zhang,Huilong Chen,Junfeng Qu,Jiayu Zhang,Gavin Conibeer
The hot carrier multi-junction solar cell (HCMJC) is an advanced-concept solar cell with a theoretical efficiency greater than 65%. It combines the advantages of hot carrier solar cells and multi-junction solar cells with higher power conversion efficiency (PCE). The thermalization coefficient (Qth) has been shown to slow down by an order of magnitude in low-dimensional structures, which will significantly improve PCE. However, there have been no studies calculating theQthof MAPbBr3quantum dots so far. In this work, theQthvalues of MAPbBr3quantum dots and after BABr addition were calculated based on power-dependent steady-state photoluminescence (PD-SSPL). Their peak positions in PD-SSPL increased from 2.37 to 2.71 eV after adding BABr. The fitting shows that, after adding BABr, theQthdecreased from 2.64 ± 0.29 mW·K−1·cm−2to 2.36 ± 0.25 mW·K−1·cm−2, indicating a lower relaxation rate. This is because BABr passivates surface defects, slowing down the carrier thermalization process. This work lays the foundation for the theoretical framework combining perovskite materials, which suggests that the appropriate passivation of BABr has the potential to further reduceQthand make MAPbBr3QDs with BABr modified more suitable as the top absorption layer of HCMJCs.
研究领域:
材料科学
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光电子学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 39
·14580-14589
·
IF 8.067
Changqian Li,Feitong Chen,Kaiyu Wang,Qing Yao,Jie Zhang,Qiqi Zhao,Qi Huang,Huiling Zhu,Jianxu Ding
Metal halide perovskite materials exhibit remarkable optoelectronic properties due to their unique crystal and electronic structures. In perovskite polycrystalline films, the carrier transport is easily affected by grain boundaries where the defect density and stress are concentrated. Lacking grain boundaries, single crystals exhibit lower defect density, higher carrier mobility and longer carrier lifetime, thus benefiting longer carrier diffusion length. However, the large thickness of single crystals is not conducive to direct extraction of carriers out of photoelectric devices because the carrier diffusion length is within dozens of micrometers. Therefore, ultrathin single crystal films (SCFs) are demanded for photoelectric devices. In this paper, we put forward an improved space confined method, in which the nucleation and growth processes are controlled through altering the heating area. A series of MAPbBr3 SCFs with maximum size over 30 mm and controllable thickness (15–45 μm) are obtained. The growth kinetics of MAPbBr3 SCFs are analyzed in detail. Owing to the controllable growth kinetics, MAPbBr3 SCFs possess higher crystallinity, higher photo-induced carrier densities and longer carrier lifetimes than the corresponding bulk single crystals (BSCs). Therefore, MAPbBr3 SCFs exhibit better optoelectronic performance and device stability as planar photo-detectors, such as lower dark currents and higher photo-currents, higher R and EQE values and higher on/off ratios.
研究领域:
材料科学
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光电技术
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DOI
高影响因子
Advanced Optical Materials
·
2023
·
IF 9
Shumei Wang,Chuang Ma,Xinmei Liu,Wenliang Huang,Tinghuan Yang,Chenxing Li,Haochen Ye,Zhan Liu,Lei Yin,Ningyi Yuan,Jianning Ding,Lihua Chen,Kui Zhao
Perovskite nanocrystals (NCs), such as MAPbX 3 (MA + = methylammonium; X = Cl, Br, or I), have received attention owing to their excellent optoelectronic properties and ease of integrating with flexible substrates. Lanthanide ion doping is widely used as an effective strategy to enhance the optoelectronic performance of perovskite NCs. However, incorporating the lanthanide dopant and ensuring the emission stability of the perovskite NCs in high-performance optoelectronic devices remains a major challenge. Herein, the synthesis of Eu 2+ -doped MAPbBr 3 NCs within the channels of SBA-15 is presented to improve their stability. The doped MAPbBr 3 NC@SBA-15 composites exhibit significantly improved stability than that of undoped MAPbBr 3 NCs. The doped MAPbBr 3 NC@SBA-15 composites exhibit moderate PL quantum yields and excellent stability under ambient conditions and UV irradiation. In addition, the MAEu 0.3 Pb 0.7 Br 3 NC@SBA-15 composite applied in white-light-emitting diodes (WLEDs) achieves a color rendering index of 73.5. Moreover, MAEu 0.3 Pb 0.7 Br 3 NC@SBA-15 can be combined with styrene-ethylene-butylene-styrene to fabricate a flexible direct X-ray detector, realizing a high sensitivity of 7592.2 µC Gy air −1 cm −2 and a low detection limit of <77 nGy air s −1 ; this is an outstanding value for a NC-based flexible direct X-ray detector. This work serves as a guide for the design of perovskite NCs for both WLEDs and flexible X-ray detectors.
研究领域:
材料科学
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光学工程
·
电子器件
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 11
·5874-5884
·
IF 3.361
Sheng Tang,Xinyu Xiao,Jing Hu,Bo Gao,Hunglin Chen,Zhuang Zuo,Qi Qi,Zongyang Peng,Jianchun Wen,Dechun Zou
Organic–inorganic hybrid perovskites have emerged as promising light harvesting materials for many optoelectronic devices. Here, we present a facile mechanochemical synthesis (MCS) route for the preparation of a series of pure phase mixed-cation/anion (FAPbI3)x(MAPbBr3)1−x (0 ≤ x ≤ 1) hybrid perovskite materials for high-efficiency thin-film perovskite solar cells (PSCs). The use of (α-FAPbI3)0.95(MAPbBr3)0.05 perovskite prepared by MCS for the thin-film PSCs achieves a maximum PCE of 15.9% from a current–voltage (J–V) scan, which stabilises at 15.4% after 120 s of the maximum power point output. Furthermore, PSCs based on (KPbI3)0.05(FAPbI3)0.9(MAPbBr3)0.05 perovskite prepared by MCS exhibit higher photovoltaic performance and lower hysteresis compared with (α-FAPbI3)0.95(MAPbBr3)0.05, with a maximum PCE of 16.7%. These results indicate that the use of mechanochemically synthesised perovskites provides a promising strategy for high performance PSCs and superior control in optoelectronic properties, leading to improved control in fabrication approaches and facilitating the development of efficient and stable PSCs in the future.
研究领域:
材料科学
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能源科学
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光电子学
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DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Fucai Cui,Peng Zhang,Longzhen Zhang,Yunqiu Hua,Xue Sun,Xiang Li,Guodong Zhang,Xutang Tao
Metal halide perovskites have emerged as next-generation semiconductors for X-ray detection because of their excellent photoelectric properties. However, severe ion migration in three-dimensional (3D) halide perovskites usually causes dark current drift in radiation detectors, especially in high electric fields. Here, we report a liquid-phase epitaxial method based on inverse-temperature crystallization (ITC), with which a hybrid/all-inorganic 3D perovskite single-crystal heterojunction is constructed, using an orientated CsPbBr3 single crystal as a substrate. MAPbBr3–nCln/CsPbBr3 single-crystal heterojunctions and single-crystal arrays (through the addition of a mask onto the substrate) with good lattice matching were successfully constructed, laying the foundation for high-performance X-ray detectors. In particular, the MAPbBr3/CsPbBr3 heterojunction drastically enhances the X-ray response of the CsPbBr3 single crystal, with a record-high sensitivity of 2.0 × 105 μC Gyair–1 cm–2 and lowest detection limit of 96 nGyair s–1 for 120 keV hard X-ray detection. Moreover, the dark current drift caused by ion migration is suppressed to 3.92 × 10–4 nA cm–1 s–1 V–1 even in a high reverse electric field of −125 V mm–1. Based on the superior detection performance, it is confirmed that a robust and uniform X-ray imaging detector with good resolution was successfully devised using the heterojunction. Our study provides a simple strategy for constructing perovskite single-crystal heterojunction films and arrays that effectively suppress ion migration that otherwise occurs in 3D halide perovskite single crystals to enable the creation of robust ultrasensitive X-ray detection and imaging systems.
研究领域:
材料科学
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半导体物理
·
辐射探测技术
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DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Zi Yin,Jiangwen Liao,Guikai Zhang,Shouwei Zuo,Shengqi Chu,Lirong Zheng,Pengfei An,Huan Huang,Juncai Dong,Jing Zhang
Surface ligand passivation strategies have been extensively used to produce metal halide perovskite nanoparticles (NPs) with excellent optoelectronic properties, and a better understanding of the ligand–NP interactions is essential to unleash the full potential of perovskite NPs. Here, the well-passivated methyl ammonium lead bromide NPs were obtained when (3-aminopropyl) triethoxysilane (APTES) and oleic acid (OA) were involved as efficient dual surface ligands. We systematically explored ligand–NP interactions by using spectroscopic analysis and theory calculations. Our results demonstrated that –[−OOC–R]− from OA would preferably occupy the Br vacancies on the surface under-coordinated Pb sites in the corner-sharing octahedral framework to form [PbBr5]3–-[−OOC–R]− complexes, whereas –NH3+ of APTES can connect with Br– on the NP surface via hydrogen bonds. These surface binding interactions can trigger the lattice contraction of NPs, which can lead to an increased Pb2+ off-centering by promoting the lone pair stereochemical activity. Furthermore, the electronic band structure can be modulated by orbital interactions within the inorganic Pb–Br frame through the surface ligand effect. This work not only increases our understanding of ligand–NP interactions in terms of coordination geometry but also reveals their influence on the stereochemical activity of the Pb 6s2 electron pair, which will provide valuable inspiration for the ligand passivation strategies in the future.
研究领域:
材料科学
·
物理化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yunxiao Du,Xiang Zhang,Yunfan Shi,Xiaoyi Hou,Fangjie Li,Qilin Zhang,Qidong Tai,Pei Liu,Xing-Zhong Zhao
The preparation of high-quality perovskite films with low defect density and long carrier lifetime is a precondition for achieving high-efficiency perovskite solar cells (PSCs). In this work, we successfully incorporated Y 3+ ions into perovskite films to enhance the photovoltaic performance of hole-transport-layer-free (HTL-free) carbon-based MAPbBr 3 PSCs in ambient atmosphere. The perovskite films exhibit better crystallinity, lower trap density, and longer carrier lifetime after the introduction of Y 3+ ions. By optimizing the doping dosage, a maximal power conversion efficiency (PCE) of 8.313% (open-circuit voltage ( V OC ) = 1.562 V) is achieved for MAPb 0.98 Y 0.02 Br 3 PSCs. Moreover, the unencapsulated device also shows remarkable long-term stability over 80 days under dry condition with 20–30% relative humidity (RH) at 20–25 °C, which even maintains 95% of its initial PCE when stored in harsh environment (80 °C and 40–70% RH) over 72 h.
研究领域:
材料科学
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能源技术
·
光伏器件
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Shuya Wang,Yipeng Huang,Linchun Zhang,Feiming Li,Fangyuan Lin,Yiru Wang,Xi Chen
Highly fluorescent methylammonium lead bromide (MAPbBr 3 ) perovskite could in situ grow in a sulfydryl functionalized mesoporous alumina film when methylammonium bromide (MABr) meets the sulfydryl-captured Pb(II). In this work, the extraction ability of the mesoporous alumina film towards Pb(II) was found to drastically enhanced after sulfydryl modification. Under the optimal conditions, the Pb(II) adsorption capacity of the sulfydryl functionalized film was 94.9 μg/g. With the strong extraction capability to Pb(II), fluorescence turn-on determination of Pb(II) was enabled by in-situ formation of MAPbBr 3 perovskite in the sulfydryl functionalized alumina film, and a limit of detection (LOD) as low as 5 × 10 −3 μg/mL was achieved. This method integrates the extraction and background-free determination of Pb(II), well addressed the low concentration determination issue and facilitating the whole analysis processes.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
OPTICS EXPRESS
·
2020
·Vol. 28
·期 8
·10714-10724
·
IF 3.669
Bin Liu,Bin Liu,Jinkai Li,Jinkai Li,Jinkai Li,Guangbin Duan,Min Ji,Yizhong Lu,Tao Yan,Bingqiang Cao,Zongming Liu,Zongming Liu
Organic-inorganic hybrid perovskite nanocrystals have been widely studied for their excellent photoelectric properties. However, the irregular morphologies of organic-inorganic hybrid perovskite nanocrystals have limited application in the field of lighting and display. From this, the regular morphologies of nanospheres, nanorods, nanoplatelets and MAPbBr3 (MA = CH3NH3+) nanocrystals have been synthesized by regulating the type and proportion of auxiliary ligands. The phase evolution, morphology and fluorescent properties were systematically studied by the various instruments of XRD, TEM, PL/UV-vis spectroscopy and fluorescence decay analysis. With the morphologies changing from nanospheres to nanoplatelets, the emission peaks of MAPbBr3 nanocrystals red-shifted, and the lifetimes have increased gradually. The underlying mechanisms were thoroughly investigated and elucidated. On this basis, the role of acid and amine in the synthesis of MAPbBr3 nanocrystals was systematically studied by regulating the ratio of oleic acid and N-octylamine. The fluorescence kinetics of MAPbBr3 nanocrystals were studied by femtosecond transient absorption spectroscopy, and the charge carrier relaxation mechanism was clarified. Furthermore, the effect of temperature on the fluorescence properties of the nanocrystal was investigated in detail. Organic-inorganic hybrid perovskite nanocrystals with morphologies-controlled and excellent fluorescence properties are expected to be widely used in lighting and display fields.
研究领域:
材料科学
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光电技术
·
纳米技术
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DOI
高影响因子
APL Materials
·
2023
·Vol. 11
·期 10
·
IF 6.1
Wu Jie,Wang Xin,Xu Yubing,Pan Yuzhu,Chai Shunjie,Zhao Jingda,Cheng Qi,Zhao Zhiwei,Li Qing,Bae Byung Seong,Fayemi Omolola Esther,Zhou Jianming,Zhu Ying,Lei Wei
Compared with the pure lead-based MAPbBr 3 (MA = CH 3 NH 3 ) perovskite single crystals (PSCs), tin–lead alloy (MAPb x Sn 1−x Br 3 ) PSCs with higher carrier mobility and longer carrier lifetime are expected to perform as better-quality ionization radiation detectors. In this work, we design MAPbBr 3 –MAPb 0.9 Sn 0.1 Br 3 –MAPb 0.8 Sn 0.2 Br 3 structure detectors by employing solution-process epitaxial growth. Because of the gradient change in tin element proportion, the relatively low mismatch rates between different PSC layers can effectively reduce defects generated at the interface, which improves charge collection efficiency. Moreover, band barriers between different PSC layers form depletion layers due to the differences in band structure, and the high resistivity and built-in electric field of depletion layers can suppress dark current under high voltages. The optimized detector exhibits a high x-ray detection sensitivity of 6.76 × 10 4 μ C Gy −1 cm −2 and the lowest detectable dose rate of 7.4 nGy s −1 under 40 kVp x-ray radiation. Based on 241 Am (5.95 MeV) α particle irradiation, tin–lead HD has lower detection noise and more obvious response compared to MAPbBr 3 PSCs. The electron mobility was indicated as high as 612 cm 2 s −1 V −1 , and the mobility-lifetime ( μ τ) products were measured to be 3.5 × 10 −3 cm 2 V −1 using the Hecht equation, demonstrating superior transport properties.
研究领域:
材料科学
·
辐射检测
·
半导体物理
·
纳米技术
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产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2022
·
IF 16.383
Chuying Ye,Jiawei Jiang,Shaolan Zou,Wenbo Mi,Yin Xiao
We developed type-II core–shell nanocrystals (NCs) with a chiral low-dimensional perovskite shell and an achiral 3D MAPbBr3 core. The core–shell NCs exhibit spin-polarized luminescence at the first excitation band of the achiral core, which is due to the chiral-induced spin selectivity (CISS) effect-governed spin-dependent shell-to-core electron transportation and the subsequent electron–hole recombination in the core. The preferred spin state of the transferred electrons is determined by the handness of the chiral shell. For the core–shell NCs film, a photoluminescence quantum yield (PLQY) of 54% and a circularly polarized luminescence (CPL) with a maximum |glum| of 4.0 × 10–3 are obtained at room temperature. Finally, we achieved a spin-polarized light-emitting diode (spin-LED), affording a circularly polarized electroluminescence (CP-EL) with a |gCP-EL|of 6.0 × 10–3 under ambient conditions.
研究领域:
材料科学
·
纳米技术
·
自旋电子学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）