Nature Communications
·
2020
·Vol. 11
·期 1
·1-9
·
IF 12.121
Wang Jifei,Luo Shiqiang,Lin Yun,Chen Yifu,Deng Yehao,Li Zhimin,Meng Ke,Chen Gang,Huang Tiantian,Xiao Si,Huang Han,Zhou Conghua,Ding Liming,He Jun,Huang Jinsong,Yuan Yongbo
The manipulation of crystal orientation from the thermodynamic equilibrium states is desired in layered hybrid perovskite films to direct charge transport and enhance the perovskite devices performance. Here we report a templated growth mechanism of layered perovskites from 3D-like perovskites which can be a general design rule to align layered perovskites along the out-of-plane direction in films made by both spin-coating and scalable blading process. The method involves suppressing the nucleation of both layered and 3D perovskites inside the perovskite solution using additional ammonium halide salts, which forces the film formation starts from solution surface. The fast drying of solvent at liquid surface leaves 3D-like perovskites which surprisingly templates the growth of layered perovskites, enabled by the periodic corner-sharing octahedra networks on the surface of 3D-like perovskites. This discovery provides deep insights into the nucleation behavior of octahedra-array-based perovskite materials, representing a general strategy to manipulate the orientation of layered perovskites.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 6
·1828
·
IF 4.927
Yingjie Su,Jianqiang Xue,Anmin Liu,Tingli Ma,Liguo Gao
Controlling the crystallographic orientations of 2D perovskite is regarded as an effective way to improve the efficiency of PSCs based on 2D perovskite. In this paper, five different assistant solvents were selected to unveil the effect of solvents on crystallization and morphology of 2D perovskite in a solvent-assisted method. Results demonstrated that the effect of Lewis basicity on the crystallization process was the most important factor for preparing 2D perovskite. The stability of the intermediate, reacted between the solvent and the Pb2+, determined the quality of 2D film. The stronger the Lewis basicity was, the more obvious the accurate control effect on the top-down crystallization process of 2D perovskite would be. This could enhance the crystallographic orientation of 2D perovskite. The effect of Lewis basicity played a more important role than other properties of the solvent, such as boiling point and polarity.Keywords:2D perovskite;perovskite solar cells;crystallization orientation;solvent
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Zhenbo Du,Yuan Xu,Yu Jing,Ruoshui Li,Jianming Lin,Jihuai Wu,Zhang Lan
All-inorganic carbon-based CsPbIBr 2 perovskite solar cells (PSCs) have attracted attention due to their more balanced performance and stability. The performance of the PSCs is highly dependent on the quality of the absorber films. Unfortunately, most high-performance films are prepared in a glove box and conventional preparation methods often produce perovskite films within 400 nm of thickness, which is detrimental to large area device fabrication and limits their commercial application. Here we had demonstrated a short chain ligands nano-CsPbIBr 2 particles modified hot-casting method to deposit a perovskite film with thickness up to 800 nm. It was carried out by spin-coating a hot CsPbIBr 2 precursor solution onto nano-CsPbIBr 2 particles film on an electron transport layer (ETL), and then depositing nano-CsPbIBr 2 particles on the precursor film again before annealing. The nano-CsPbIBr 2 particles on the ETL promotes precursor solution crystallization and increased film thickness, and the nano-CsPbIBr 2 particles on the precursor film promoted grain growth and reduced defects due to compositional deviations from stoichiometric ratios. The power conversion efficiency (PCE) of the PSCs fabricated by this method is up to 10.66 %. The unencapsulated PSCs still retain more than 85 % of the initial PCE when stored at ambient atmosphere (RH 50–60 %) for 10 days.
研究领域:
材料科学
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太阳能
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纳米技术
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化学工程
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DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 35
·14915-14924
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IF 7.79
Weihai Sun,Jinjun Zou,Xiaobing Wang,Shibo Wang,Yitian Du,Fengxian Cao,Lan Zhang,Jihuai Wu,Peng Gao
Regardless of the impressive progress that perovskite solar cells (PSCs) have achieved, especially considering their power conversion efficiency (PCE) over 25%, traditional PSCs still contend with an inherent instability with exposure to humidity, which remains as a critical issue for the realization of commercial production. Herein, we proposed an effective pathway to relieve the instability of PSCs without sacrificing efficiency by introducing a 2D phase at the surface of the 3D perovskite film, based on a novel organic cyclohexylmethylammonium iodide (CMAI). The self-assembled thin 2D capping layer atop the 3D perovskite layer can not only reduce the ionic defects, but also serve as a protective barrier against moisture. Consequently, the champion device incorporating 2D perovskite capping layers delivered an open-circuit voltage (Voc) of 1.19 V, which contributes to an impressive PCE of 22.06% on account of the improved charge extraction and decreased non-radiative recombination. More importantly, an excellent long-term stability along with mitigated hysteresis was observed for the modified devices as a result of the suppressed ion migration and high humidity resistance of the 2D perovskite film. Our finding provides a comprehensive approach for simultaneously enhancing the efficiency and stability of PSCs through dimension engineering utilizing CMA-based 2D perovskite materials.
研究领域:
材料科学
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能源技术
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DOI
PubMed
高影响因子
Crystals
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2021
·Vol. 11
·期 11
·1287
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IF 2.589
Yue Han,Rong Wen,Feng Zhang,Linlin Shi,Wenyan Wang,Ting Ji,Guohui Li,Yuying Hao,Lin Feng,Yanxia Cui
High-quality, all-inorganic CsPbBr3/Cs4PbBr6composite perovskite nanocrystals (NCs) were obtained with all-solution-processing at room temperature, and a photodetector (PD) with high detectivity was realized based on CsPbBr3/Cs4PbBr6NCs. The detectivity (D*) of the proposed PD is 4.24 × 1012Jones under 532 nm illumination, which is among the highest levels for PDs based on all-inorganic perovskite NCs. In addition, a high linear dynamic range (LDR) of 115 dB under 1 V bias was also realized. Furthermore, the underlying mechanism for the enhanced performance of the proposed PD was discussed. Our work might promote the preparation of high-performance PDs based on dual-phase all-inorganic perovskite nanocrystals.Keywords:all-inorganic lead halide perovskite;CsPbBr3;Cs4PbBr6;perovskite nanocrystals;photodetector
研究领域:
材料科学
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2019
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IF 5.383
Hainan Sun,Juan He,Zhiwei Hu,Chien-Te Chen,Wei Zhou,Zongping Shao
The oxygen evolution reaction (OER) plays a crucial role in the application of water splitting, which is a highly competitive option for a sustainable energy future. Thus, it is vital to design highly active and durable electrocatalyst for OER. Herein a hybrid with the nominal composition of Ba 2 Co 1.5 Mo 0.25 Nb 0.25 O 6-δ (denoted as BC1.5 MN) electrocatalyst consisting of both double perovskite and single perovskite structures is synthesized by a solid-state reaction method. When tested as an electrocatalyst for OER, the BC1.5 MN electrocatalyst requires a current density of 10 mA cm −2 at an overpotential of 400 mV, an onset overpotential of 260 mV, and a Tafel slope of 70 mV dec −1 , which are superior to that of precious metal oxide IrO 2 catalyst. Chronoamperometric and cyclic voltammetry studies demonstrate that the BC1.5 MN electrocatalyst has outstanding durability in alkaline solution. The synergistic effect between multi-active sites derived from a single/double perovskite hybrid structure results in one of the most active perovskite-based OER electrocatalysts in alkaline solution.
研究领域:
材料科学
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电化学
✓ 已验证
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Liping Fang,Kai Wang,Chen Han,Xinyong Li,Pei Li,Jieshan Qiu,Shaomin Liu
Piezocatalysis utilizes mechanical energy to achieve the required charge separation for redox reactions, a promising method for clean H 2 O 2 production. However, the efficiency of conventional piezocatalysts is limited by the undesirable low piezoelectricity. Herein, novel piezocatalysts composed of La, Sr, Co (Fe) in simple single perovskites (La 0.5 Sr 0.5 FeO 3-δ and La 0.5 Sr 0.5 CoO 3-δ ) and Ruddlesden-Popper (R-P) type perovskites (LaSrFeO 4-δ and LaSrCoO 4-δ ) are developed for piezocatalytic H 2 O 2 production. Results indicate that Fe-containing catalysts outperform Co-containing counterparts and the unique R-P perovskite oxides demonstrate significantly enhanced piezocatalytic performance than the corresponding single perovskites. For example, via piezocatalysis, the LaSrFeO 4-δ exhibits H 2 O 2 yields of 548 (in 10 % ethanol) and 247 µmol g −1 h −1 (without sacrificial agent), improved by a factor of 1.14, 4.94, or 21.73 compared to La 0.5 Sr 0.5 FeO 3-δ , LaSrCoO 4-δ , or La 0.5 Sr 0.5 CoO 3-δ , respectively. The piezoelectricity is an overwhelming factor in determining the H 2 O 2 generation. Furthermore, the piezoelectricity and oxygen vacancy (OV) content is well correlated. The R-P phase with lower OV exhibits a higher piezoelectricity because of the eliminated pining effect to the polarization domain reversion. Mechanism exploration suggests that H 2 O 2 formation stems from the efficient O 2 reduction via a 2-electron transferring pathway, during which the piezoelectric polarization drives the charge separation and transportation, favoring the redox reactions.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
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DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 10
·2738
·
IF 5.076
Jinsong Qi,Shixun Wang,Arsenii Portniagin,Stephen V. Kershaw,Andrey L. Rogach
Lead-free two-dimensional metal halide perovskites have recently emerged as promising light-emitting materials due to their improved stability and attractive optical properties. Herein, a facile room temperature wet milling method has been developed to make Dion–Jacobson (DJ) phase ODASnBr4perovskite microcrystals, whose crystallization was accomplished via the aid of introduced primary alcohols: ethanol, butanol, pentanol, and hexanol. Due to the strong intermolecular hydrogen bonding, the use of ethanol promoted the formation of non-doped ODASnBr4microcrystals, with an emission peaked at 599 nm and a high photoluminescence quantum yield (PL QY) of 81%. By introducing other primary alcohols with weaker intermolecular hydrogen bonding such as butanol, pentanol, and hexanol, [SnBr6]4−octahedral slabs of the DJ perovskite microcrystals experienced various degrees of expansion while forming O–H…Br hydrogen bonds. This resulted in the emission spectra of these alcohol-doped microcrystals to be adjusted in the range from 572 to 601 nm, while keeping the PL QY high, at around 89%. Our synthetic strategy provides a viable pathway towards strongly emitting lead-free DJ perovskite microcrystals with an improved stability.Keywords:Dion–Jacobson perovskites;tin bromide perovskites;photoluminescence;crystallization;primary alcohols
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2023
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IF 6.4
Zihui Liang,Yang Shi,Tian Yuan,Bowen Jin,Yidong Ming,Fengxiang Chen,Shimin Wang,Jing Li,Congcong Wu
The synthetical strategy of methylamine (MA) molecular treatment for fabricating perovskite film has been attracting increasing attention because of the ease of fabrication feature and the high-throughput process. In this approach, we found both of perovskite salts (MAI and PbI2) and crystals have been used as the source materials for the interaction with MA molecules. Even though both alternatives are applicable, the reaction routes toward perovskite crystalline film are distinct, which correlates with the photovoltaic performance and the fabrication process design. Therefore, we systematically studied the difference between perovskite salts and crystals with respect to precursor solubility, crystallization dynamics, perovskite crystal structure, and photoelectric properties. The results show the configuration and the crystallization dynamic of the salts and crystal-derived solution are different. The salt-derived solution consists of iodoplumbate complexes, while the crystal-derived solution is composed of perovskite sheet intermediates. Because of the ordered stacking behavior of the perovskite sheet intermediates, the crystal-derived perovskite films showed faster crystallization and preferred crystal orientation, which results in superior charge carrier transport properties and higher conversion efficiency. The disclosure of the distinct features between salts and crystals provides guidelines to modulate the solution chemistry for higher photovoltaic performance.
研究领域:
材料科学
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光伏技术
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化学工程
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Yuan Cai,Jialun Wen,Zhike Liu,Fang Qian,Chenyang Duan,Kun He,Wenjing Zhao,Sheng Zhan,Shaomin Yang,Jian Cui,Shengzhong (Frank) Liu
The replacement of small cations with bulkier organic cations containing long alkyl chains or benzene rings to form a thin two-dimensional (2D) perovskite passivation layer on three-dimensional (3D) perovskite (2D/3D) has become a promising strategy for improving both the efficiency and stability of perovskite solar cells (PSCs). The 2D layer defines the interfacial chemistry and physics at the 2D/3D bilayer and endows the 2D/3D structure with better chemical and thermal stability. Herein, 2D/3D (CF 3 -PEA) 2 FA 0.85 MA 0.15 Pb 2 I 7 /FA 0.85 MA 0.15 PbI 3 planar heterojunction perovskite was produced using a facile interfacial ion exchange process. The 2D (CF 3 -PEA) 2 FA 0.85 MA 0.15 Pb 2 I 7 capping layer can not only passivate the FA 0.85 MA 0.15 PbI 3 film but also act as super-hydrophobic layer to inhibit water diffusion and significantly enhance the stability. The 2D capping layer can also establish a unique graded band structure at the perovskite/Spiro-OMeTAD interface and lead to p-type doping for Spiro-OMeTAD layer which is beneficial for efficient charge transport. Optimized PSCs based on this 2D/3D heterojunction yield a champion power conversion efficiency (PCE) of 23.1% and improved stability. The device maintains 84% output for 2400 h aging under ambient environmental conditions without encapsulation, and maintains 81% for 200 h under illumination with encapsulation. This work will inspire the design of more fluorinated 2D perovskite interfaces for advanced photovoltaics and beyond.
研究领域:
材料科学
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光伏技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
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IF 2.605
Yabing Zhang,Li Zhong,Dongping Duan
In the present study, strontium titanate (SrTiO 3 ) nanoparticles were successfully synthesized by a single-step direct hydrothermal process under the strong alkaline condition using crystalline anatase titanium dioxide (TiO 2 ) and strontium hydroxide octahydrate (Sr(OH) 2 ·8H 2 O) as the starting materials at 220 °C. The X-ray diffraction (XRD) patterns identified the products were highly crystalline and well matched with standard SrTiO 3 data. The crystalline structure, lattice parameters , and atomic position were refined by Highscore Plus and Maud program. The results of Rietveld refinement showed high purity of products. The thermal field emission scanning electron microscope and energy dispersive spectrometer (FE-SEM-EDS) displayed the samples prepared were perovskite phase cubic SrTiO 3 nanoparticles having regular morphology and small particle with a size distribution of 32–45 nm. The fine morphologies and structures of SrTiO 3 nanoparticles were investigated by field emission transmission electron microscope (FE-TEM). The results showed the important roles played by reaction duration and mole ratio of Sr and Ti (Sr/Ti) to the grain size of SrTiO 3 nanoparticles. The particle sizes increased with prolonging reaction duration and reducing Sr/Ti. Compared to SrTiO 3 synthesized by solid state reaction, the as-synthesized SrTiO 3 nanoparticles had large specific surface areas (up to 32.98 m 2 /g), which would exhibit potential applications in photocatalysis . The reaction mechanism of the process was illustrated using the dissolution–precipitation mechanism finally.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Sustainable Energy & Fuels
·
2023
·Vol. 7
·期 12
·2853-2860
·
IF 5.6
Yuanjing Wang,Tie Liu,Jiawei Zhang,He Liu,Hongfei Li,Ying Lv,Xiaoyang Guo,Xingyuan Liu,Langping Tu,Yulei Chang,Bin Li
The formation of a two-dimensional (2D) perovskite layer on the top of three-dimensional (3D) perovskite has been demonstrated to be effective in reducing interfacial charge recombination and improving the performance and stability of perovskite solar cells (PSCs). However, it is difficult to fabricate a 2D/3D perovskite heterojunction with accurate composition and structure through a solution-only process, and the location of the 2D perovskite is also difficult to regulate owing to the uncontrolled cation exchange between organic constituents, which results in mismatched energy level arrangements. Herein, a 2D perovskite with a spacer cation of 1,4-dimethylphenylene ammonium is grown on 3D perovskite film by the solid-state heat-pressure method. The relevant growth process, light absorption ability, energy level regulation, and stability of the samples are systematically investigated. A broad range of experimental characterizations show that the introduction of 2D perovskite improves the energy level alignment with the adjacent carbon electrode and enhances the hydrophobic property of the perovskite sample. As a result, a remarkable power conversion efficiency (PCE) of 15.63% is achieved for the carbon-based hole-transport-layer-free PSCs based on 2D/3D heterojunction, which is higher than that of the control 3D device (11.88%). Simultaneously, the improved device retains 90% of its initial performance after aging for 1000 h in ambient conditions. The present work opens a new avenue for designing 2D/3D perovskite heterojunctions and improving the performance and stability of PSCs.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）