APPLIED PHYSICS LETTERS
·
2021
·Vol. 118
·期 26
·
IF 3.791
Zheng Haihua,Zhou Zhongpo,Wang Ti,Gui Pengbin,Wu Hao,Liu Chang
Inorganic perovskites, such as CsPbX 3 (X = Cl, Br, I), have attracted attention due to their excellent thermal stabilities and high photoluminescence quantum efficiencies. Here, we report on all-inorganic light-emitting diodes (LEDs), including inorganic perovskite emitters (CsPbBr 3 ) based on the heterostructure of n-ZnO/Al 2 O 3 /CsPbBr 3 /p-GaN. The effects of the CsPbBr 3 and Al 2 O 3 interlayers on the electroluminescence performance have been systematically investigated. It is observed that the Al 2 O 3 interlayer plays an important role in determining the emission performance. By introducing the Al 2 O 3 layers, the electron–hole recombination can almost be limited within the perovskite. The emission peaks of the heterojunction LEDs change from blue-green to pure green with the increased luminous intensities and decreased leakage currents. It provides an idea for the preparation of all-inorganic perovskite LEDs.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Journal of Analysis and Testing
·
2021
·Vol. 5
·期 1
·40-50
·
IF 0
Tan Xiao-Hong,Huang Guo-Bin,Cai Zhi-Xiong,Li Fei-Ming,Zhou Yan-Mei,Zhang Mao-Sheng
The application of all-inorganic CsPbX 3 (X = Cl − , Br − and I − ) perovskite nanocrystals (PNCs) is hindered by their poor stability under different environments (moisture, UV light and high temperature). Herein, we demonstrate a novel in-situ growth and post-coating technique to prepare monodisperse spherical sandwiched structured SiO 2 @CsPbX 3 @SiO 2 perovskite composites. In this strategy, the environmental stability of CsPbX 3 PNCs is remarkably improved due to protecting evenly distribution in the surface of composites through the design of spherical sandwiched structure, and the negative effects of SiO 2 coating on photoluminescence property of CsPbX 3 PNCs could be reduced effectively. Furthermore, regular monodisperse spherical structure and uniform size of composites greatly benefit their application in relative fields. The experiment results indicate that the as-prepared product have outstanding abilities of water-, oxidation- and UV radiation resistance. Finally, the SiO 2 @CsPbBr 3 @SiO 2 perovskite composites are successfully used for highly sensitive detection of Fe 3+ in water sample. The results show limit of detection (LOD) is 3 µM and good linearity is between 10 and 70 µM ( R 2 = 0.9963). Furthermore, the proposed perovskite composites have been successfully applied for the analysis of Fe 3+ in real samples with satisfactory results.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 7
·1-13
·
IF 2.02
Yang Liu,Li Dongmei,Wang Cong,Yao Wei,Wang Hao,Huang Kaixiang
Currently, all-inorganic cesium lead-halide perovskite nanocrystals have attracted enormous attentions owing to their excellent optical performances. While great efforts have been devoted to CsPbBr 3 nanocrystals, the perovskite-related Cs 4 PbBr 6 nanocrystals, which were newly reported, still remained poorly understood. Here, we reported a novel room-temperature reaction strategy to synthesize pure perovskite-related Cs 4 PbBr 6 nanocrystals. Size of the products could be adjusted through altering the amount of ligands, simply. A mixture of two good solvents with different polarity was innovatively used as precursor solvent, being one key to the high-yield Cs 4 PbBr 6 nanocrystals synthesis. Other two keys were Cs + precursor concentration and surface ligands. Ingenious experiments were designed to reveal the underlying reaction mechanism. No excitonic emission was observed from the prepared Cs 4 PbBr 6 nanocrystals in our work. We considered the green emission which was observed in other reports originated from the avoidless transformation of Cs 4 PbBr 6 into CsPbBr 3 nanocrystals. Indeed, the new-prepared Cs 4 PbBr 6 nanocrystals could transform into CsPbBr 3 nanosheets with surface ligands mediated. The new-transformed two-dimensional CsPbBr 3 nanosheets could evolve into large-size nanosheets. The influences of surface ligand density on the fluorescent intensity and stability of transformed CsPbBr 3 nanosheets were also explained. Notably, the photoluminescence quantum yield of the as-transformed CsPbBr 3 nanosheets could reach as high as 61.6% in the form of thin film. The fast large-scale synthesis of Cs 4 PbBr 6 nanocrystals and their ligand-mediated transformation into high-fluorescent CsPbBr 3 nanosheets will be beneficial to the future optoelectronic applications. Our work provides new approaches to understand the structural evolution and light-emitting principle of perovskite nanocrystals.
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研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 12
·1909701
·
IF 16.836
Wen-Guang Li,Xu-Dong Wang,Jin-Feng Liao,Yong Jiang,Dai-Bin Kuang
Hybrid organic–inorganic lead halide perovskite single crystal thin film (SCTF) recently has attracted enormous interest in the field of optoelectronic devices, since it efficiently resolves the trade-off between thickness and carrier diffusion length. However, the toxicity of lead element and the instability induced by organic component still hinder its future developments. In this work, lead-free all-inorganic Cs 3 Bi 2 I 9 SCTF with a high orientation along (00h) has been in situ grown on indium tin oxide (ITO) glass via a space-limited solvent evaporation crystallization method. The trap density of Cs 3 Bi 2 I 9 SCTF (5.7 × 10 12 cm −3 ) is 263 folds lower than that of the polycrystalline thin film (PCTF) counterpart, together with a 5-order-of-magnitude higher carrier mobility. These superior charge transfer properties enable a photoresponse on–off ratio as high as 11 000, which far surpasses that of the PCTF device by 460 folds, comparable to the lead halide perovskite. Furthermore, the Cs 3 Bi 2 I 9 SCTF photodetector exhibits outstanding stability even without any encapsulation, whose initial performance is well maintained after aging 1000 h in humid air of 50% RH or continuous on–off light illumination for 20 h. This work will pave the way to produce new families of high-performance, stable, and nontoxic perovskite SCTF for future optoelectronic applications.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 37
·2102272
·
IF 13.281
Xi Guo,Biao Zhao,Kunxiang Xu,Shaomin Yang,Zhike Liu,Yu Han,Jie Xu,Dongfang Xu,Zhanao Tan,Shengzhong (Frank) Liu
Interface modification to minimize charge recombination and trapping for efficient charge transport is crucial for the performance of perovskite solar cells (PSCs). Herein, functionalized p-type blue carbon dots (B-CDs) are ventured as an interface passivation layer to enhance the efficiency and long-term stability of all-inorganic CsPbI 2 Br PSCs. It is found that first the blue carbon dots with abundant N H, C N, C O, and CO functional groups effectively passivate defects by reacting with I − and Pb 2+ ions in the perovskite through hydrogen and coordinative bonds. Second, the p-type B-CDs modifiers form a P–N junction with the n-type perovskite to provide efficient pathways for hole transfer and electron blocking. Third, the B-CDs increase the hydrophobicity of the perovskite film to improve the stability of CsPbI 2 Br PSCs. With the above advantages, the CsPbI 2 Br PSC with B-CDs modification shows an efficiency as high as 16.76%, one of the highest for its type. In addition, the modification renders significant improvement of air and light stability, with 95.33% of the initial PCE retained after storage in the ambient environment for 1000 h. This work demonstrates the great potential of B-CDs application in perovskite-based optoelectronic devices.
研究领域:
材料科学
·
光伏技术
·
界面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small Structures
·
2024
·
IF 13.9
Qile Li,Shuochen Fan,Xiaodong Luan,Ke Xu,Xianqi Wei,Qinlin Shao,Huaping Peng,Linxing Shi
All-inorganic perovskite CsPbBr 3 (CPB) nanocrystals (NCs) are not widely applied in aqueous environments due to their readily decomposable nature. Therefore, the aqueous-phase preparation of CPB NCs has been a considerable challenge. In this work, a feasible method is proposed for preparing aqueous-phase core–shell CPB nanorods (NRs) encapsulated with polydopamine (PDA) by employing a multifunctional additive cesium trifluoroacetate (Cs-TFA). Highly luminescent TFA-CPB NRs are obtained via a chemical transformation of Cs 4 PbBr 6 NCs in water. Subsequently, PDA constitutes a robust shell on the surface of TFA-CPB NRs through the covalent oxidative polymerization, which effectively reduces the original dynamic properties of surface ligands, retards the decomposition of ligands and inhibits the leakage of Pb 2+ ions. The results demonstrate that the fluorescence intensity of TFA-CPB@PDA NRs maintains 49.3% of the initial intensity after 136 days. Meanwhile, the NRs exhibit low cytotoxicity, and the cell viability remains at 80% when the concentration of the NRs is 200 μg mL −1 . The reliable preparation of aqueous-phase core–shell perovskite NRs (PNRs) will facilitate their development in many fields, such as materials science, biology, medicine, and their applications in aqueous environments.
研究领域:
材料科学
·
生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2020
·Vol. 4
·期 7
·2000016
·
IF 7.527
Chong Liu,Jiajun He,Miao Wu,Yuanchuang Wu,Pengcheng Du,Limin Fan,Qin Zhang,Duofa Wang,Tianjin Zhang
The energy loss of all-inorganic metal halide perovskite solar cells is large, which reduces the open-circuit voltage and photoelectron conversion efficiency of the device. Herein, it is found that the cathode electron transfer speed is much lower than the anode hole transfer speed in CsPbI 2 Br perovskite solar cell with fluorine-doped tin oxide (FTO) glass/SnO 2 /CsPbI 2 Br/carbon structure, which induces charge accumulation at the cathode and energy loss of the device accordingly. By introducing a new conductive polymer additive polyaniline (PANI) to the CsPbI 2 Br film, the electron transfer speed at the cathode is enhanced, resulting in balanced charge transfer at both electrodes and reduced energy loss of the device. Ultraviolet photoelectron spectroscopy measurement reveals that the PANI pushes the conduction band minimum of CsPbI 2 Br upward, leading to stronger driving force for electron extraction. Therefore, the nonradiative recombination at the SnO 2 /CsPbI 2 Br interface is greatly suppressed. In addition, PANI can also effectively passivate defects and promote the crystal quality of CsPbI 2 Br, leading to reduced nonradiative recombination in perovskite materials. Accordingly, the optimized all-inorganic CsPbI 2 Br solar cell delivers a high V oc of 1.33 V and power conversion efficiency (PCE) of 13.52%.
研究领域:
材料科学
·
光伏技术
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yaofang Zhang,Yingwen Pan,Jian Ni,Zirui Yan,Nanping Deng,Wei Sun,Weimin Kang
Recently, all-inorganic CsPbX 3 (Br, I, CI) perovskites are hot and potential materials which apply to photoelectric device , due to their excellent photoelectric properties such as high carrier mobility , high fluorescence, etc. However, the poor stability greatly restricts their practical applications. In this paper, CsPbBr 3 nanocrystals (NCs) were in-situ encapsulated into PS polymer nanofibers by one step electrospinning with highly uniform size and spatial distribution. The hydrothermal stability of the obtained CsPbBr 3 @PS flexible fiber paper was radically improved with a photoluminescence quantum yield (PLQY) of 66.3%. The PL strength remained 97.2% of the initial value after immersion in water for 10 days. Their PLQY remains above 50% of its original value after heating at 80 °C for 5 h. Due to the excellent optical properties and stability of CsPbBr 3 @PS flexible fiber papers, the detection for rhodamine 6G (R6G) and rhodamine B (RhB) aqueous solution with high FRET value of 24.7% and 21.4%, respectively. Moreover, the minimum detection limit for R6G aqueous solution is 0.005 ppm. This study suggests that the CsPbBr 3 @PS flexible fiber paper is a good candidate for fabricating flexible optoelectronic devices, promising application potentials in lighting and display fields.
研究领域:
材料科学
·
光电设备
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Yeming Xian,Yongli Zhang,Naveed Ur Rahman,Hang Yin,Yi Long,Peng Liu,Wenzhe Li,Jiandong Fan
Owing to the high toxicity of Pb-based hybrid perovskites, a hypotoxic element, e.g., Sn, was employed to partially or completely replace Pb with the aim of gaining environmentally friendly lead-free photoelectronic device. Herein, for the first time we hydrothermally grow a series of all-inorganic CsSnxPb1–xBr3 (0 ≤ x ≤ 1) perovskite single crystals and carefully study their crystallographic structure and electronic structure that are subject to the varied x value. The phase transition and narrowed band gap from CsPbBr3 to CsSnBr3 are observed, which is similar to the evolution of MASnxPb1–xBr3 perovskites while varying the ratio of Sn/Pb. Likewise, the incremental concentration of Sn atoms in the lattice tend to cause the energy level splitting that likely derives from the orbital overlapping between Sn and/or Pb atoms, which thereby gives rise to the narrowed band gap. Equally important is that the incorporation of Sn atoms is demonstrated to be capable of tightening the electron orbital coupling between Sn and/or Pb atoms, which thereafter enables advantageous balancing of the orbital overlap in the crystal structure with balanced and highly ordered arrangement of [SnBr6]4– and/or [PbBr6]4– octahedra and thus allows us to improve carrier transport and to benefit the real ecofriendly application of photoelectronic devices.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 10
·3351-3358
·
IF 7.059
Shoulong Chen,Tianju Zhang,Xiaolin Liu,Jinli Qiao,Lin Peng,Jun Wang,Yongsheng Liu,Tieying Yang,Jia Lin
Inorganic CsPbI2Br halide perovskite has received extensive attention due to its excellent thermal stability and suitable bandgap for high-performance solar cells. However, CsPbI2Br can easily transform from the perovskite phase to the non-perovskite phase due to a water vapour-induced phase transition under ambient conditions, leading to a rapid degradation of device performance. Herein, we introduced lanthanum (La3+) ions into the lattice to stabilize the perovskite phase in CsPbI2Br-based all-inorganic solar cells. A power conversion efficiency of 8.03% was obtained at an optimized La3+-doping level of 2%, leading to a 27% efficiency improvement. Moreover, the La3+-doped solar cell retained 90% of its efficiency in ambient air for 400 h, showing a significantly enhanced moisture stability compared to that of the pristine (undoped) device. Detailed analysis indicates that La3+-ions can induce lattice shrinking and thus inhibit the formation of a non-perovskite phase, and enhance the charge carrier lifetime, which contribute to the improved moisture stability and efficiency. Our results indicate that highly stable all-inorganic solar cells can be produced in an air atmosphere, showing great potential for future commercialization.
研究领域:
材料科学
·
太阳能电池
·
光电转换
✓ 已验证
DOI
高影响因子
Energies
·
2025
·Vol. 18
·期 9
·2162
·
IF 3.2
Yufan Jiang,Dongdong Deng,Jingjing Dong
All-inorganic CsPbX3perovskites have significant potential for applications in the photovoltaic field. However, during their preparation, the slow evaporation rate of the precursor solution limits the extent of solution supersaturation, leading to porous perovskite films that substantially impair device performance. Anti-solvent engineering, which introduces a secondary solvent to modulate the crystallization process, is a well established technique in perovskite photovoltaic research. This study systematically examines the effects of four different anti-solvents on perovskite films and corresponding devices. It also investigates the optimal dipping-time of (trifluoromethyl)benzene as an anti-solvent, as well as the impact of varying amounts of anti-solvent additive perfluorinated acid. The optimized devices achieved a maximum power conversion efficiency of 12.68%.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Jing Yang,Yunlong Gan,Mengqi Han,Shiheng Wang,Pengwei Li,Yiqiang Zhang,Gang Li,Yanlin Song
Wide-bandgap mixed-halide perovskites, particularly CsPbIBr 2 , hold great promise for multi-junction solar cells due to their well-matched bandgap and all-inorganic material system. However, their inherent susceptibility to light-induced phase segregation (LIPS) limits efficiency and stability. In this work, we investigate the effect of three organic additives—4-cyclopentene-1,3-dione (CPD), maleimide (HPD), and 3,4-dibromo-1H-pyrrole-2,5(2H,5H)-dione (BrPD)—on LIPS in wide-bandgap CsPbIBr 2 perovskite films. The additives form various chemical interactions, including coordination bonds, hydrogen bonds, and ionic bonds, with I − and undercoordinated Pb 2+ ions, among which BrPD has the strongest interaction. This interaction regulates crystallization and improves film morphology. The BrPD-modified films have the largest grain size and the highest light stability, suppressing LIPS, enhancing carrier transfer, and improving device performance. BrPD-modified CsPbIBr 2 -based solar cells achieve a power conversion efficiency (PCE) of 11.34%, outperforming the control (8.96%) and other additives. Moreover, BrPD-modified devices show excellent stability, retaining 94% of their initial PCE after 60 min of continuous light exposure. This work highlights the potential of strategically selected organic additives to enhance the stability and performance of perovskite solar cells, offering valuable insights for the design of high-efficiency and long-lasting perovskite-based optoelectronic devices.
研究领域:
材料科学
·
光伏技术
·
太阳能电池
✓ 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）