ACS Applied Energy Materials
·
2020
·
IF 4.473
Jiayi Guan,Jian Ni,Xiaojun Zhou,Yue Liu,Junyang Yin,Jinlin Wang,Dan Wang,Yaofang Zhang,Juan Li,Hongkun Cai,Jianjun Zhang
Among deposition methods, ultrasonic spray-coating has particularly strong potential for large-scale production due to its low cost and capability to produce thin films with large-scale areas for industrial applications. In this work, SnO2 electron transport layers (ETLs) were successfully prepared via ultrasonic spray-coating at a low temperature. A series of spraying parameters were optimized to adjust the drying process. Finally, compact pinhole-free ETLs with high transmittance and preeminent electron migration efficiency were obtained. The small-area perovskite solar cells (PSCs) (0.29 cm2) were fabricated based on the aforesaid SnO2 ETLs exhibiting a distinguished power conversion efficiency (PCE) of 18.72%. More than 85% of the original PCE was retained after the cells were stored in a drying tower (room temperature (RT), 30% relative humidity (RH)) for 1000 h without encapsulation, which reflects the remarkable stability of the devices. Moreover, minimodules (4 cm × 4 cm) were also fabricated successfully with a PCE of 10.57%.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Yi Ding,Yan Wu,Ying Tian,Yuzeng Xu,Minna Hou,Bo Zhou,Jingshan Luo,Guofu Hou,Ying Zhao,Xiaodan Zhang
Guanidinium (GA) cations are intentionally introduced in MAPbI 3 perovskite by considering its potential capability of stabilizing the material through plenty of hydrogen bonds and mitigating hysteresis because of the zero dipole moment. The configurations of GA cation in film and its effects on structural, optoelectronic and photovoltaic properties of perovskite have been comprehensively studied by systematically modulating the GA ratio. It has been demonstrated that moderate GA cations can effectively passivate the defect surrounding perovskite grains, yielding an enhanced efficiency as high as ~19.2% in a p-i-n type planar solar cells with the GA ratio of 15%. Further increasing the GA ratio deteriorates device performance, as extra GA cations hinder grain growth and thus reduce the grain size, which facilitates the defect generation around the enhanced interface. Moreover, a new two-dimensional (2D) layered perovskite phase that features alternating GA and MA cations in the interlayer space (ACI) appears ultimately, while the ACI phase typically suffers from slow charge transportation across the parallel PbI 2 octahedral layers separated by large A-site cations.
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Li Yujiao,Li Chen,Yu Huanqin,Yuan Beilei,Xu Fan,Wei Haoming,Cao Bingqiang
To regulate the optical and electrical properties of the crystals and films of the intrinsic methylammonium lead iodide (CH3NH3PbI3), we dope them with sodium (Na) by selecting sodium iodide (NaI) as a dopant source. The highly conductive p-type sodium-doped CH3NH3PbI3 (MAPbI3: Na) perovskite single crystals and thin films are successfully grown using the inverse temperature crystallization (ITC) method and antisolvent spin-coating (ASC) method, respectively. With the increase of Na+ doping concentration, the grain size of the film increases, the surface becomes smoother, and the crystallinity improves. Hall effect results demonstrate that both the MAPbI3: Na thin films and single crystals change their quasi-insulating intrinsic conductivity to a highly conductive p-type conductivity. The room-temperature photoluminescence (PL) peaks of doped MAPbI3 films slightly blue shift, while the photocarriers' lifetime becomes longer. The optical fingerprints of the doped levels in MAPbI3: Na perovskites can be identified by temperature-dependent PL. Obvious fingerprints of Na-related acceptor (A0X) levels in the doped MAPbI3: Na were observed at 10 K. These results suggest that sodium doping is an effective way to grow highly conductive p-type MAPbI3 perovskites.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2020
·
IF 8.821
Kunlin Liu,Ting Yang,Xuewen Zheng,Chengyang Wang,Mingming Chen
Low energy density is a fatal disadvantage of electric double-layer capacitor (EDLC). The improvement of the operation voltage of EDLCs is a more effective method to increase the energy density of EDLCs. When the operation voltage of EDLCs is higher than 2.7 V, the oxygen-containing functional groups on the surface of electrode materials (porous carbon) will decompose or chemically react with the electrolyte, causing significant deterioration of EDLC performance. In this paper, porous carbon with low oxygen content is prepared by using the potassium-assisted carbonization of chlorobenzene in Ar/H 2 mixed gas to improve withstanding voltage characteristic of porous carbon. By constructing a relatively closed and stable pyrolysis environment (employing the nickel crucible with a lid), using the carbonaceous precursor without oxygen atoms (chlorobenzene) and selecting reasonable carbonization operation atmosphere (Ar/H 2 ), the oxygen content of the as-prepared porous carbon (PC-KC-1000) is only 4.02 wt%. When the PC-KC-1000 sample is used as the electrode material of EDLCs, the operation voltage of EDLCs in the TEABF 4 /PC and EMIMBF 4 electrolytes is respectively 3.3 and 3.5 V, and the maximum energy density is respectively 53.5 and 64.4 Wh kg −1 . This strategy provides a new idea for the preparation of porous carbon with low oxygen content.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Cui-Ping Ye,Ya-Fei Qiao,Rui-Nan Wang,Wen-Ying Li
To identify the effect of solvents and anthracene on the purification of carbazole, the solvent crystallization of carbazole was investigated with xylene, chlorobenzene and tetrachloroethylene (TCE) as solvents under two forced circulation cooling (FCC) modes. The co-crystalline experimental data were obtained from runs carried out at different anthracene levels between 1% (mass) and 10% (mass). The results showed that a uniform flake carbazole crystal obtained when using xylene and chlorobenzene under the FCC-1 mode with gradual cooling rate. Nevertheless, fine flake crystals grown under shock cooling of FCC-2 mode. It is beneficial to improving the purity of carbazole with chlorobenzene as solvent under cooling mode of FCC-1. Anthracene could promote the growth of carbazole in solution, and it has a significant influence on the purification of carbazole.
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2020
·Vol. 5
·期 3
·2000621
·
IF 7.527
Yonghui Chen,Xiaoqing Yang,Pengyun Liu,Wei Wang,Ran Ran,Wei Zhou,Zongping Shao
Organic–inorganic halide perovskite solar cells (PSCs) are a new class of photovoltaic devices, which have attracted increasing interests due to high efficiency, low cost, and simple fabrication process. Although a remarkable enhancement in power conversion efficiency (PCE) has been achieved in the last decade, the stability issue, including high water/heat sensitivity and UV light-induced degradation, has become one of the main obstacles for practical applications of PSCs. Herein, hydrophobic butyl acrylate with CO and CC groups is reported as a new additive to enhance the PCE and moisture/thermal stability of CH 3 NH 3 PbI 3 -based PSCs, which improves the quality of the perovskite film by promoting defect passivation, constructing a suitable energy-level alignment, and increasing the charge carrier lifetime in PSCs. Such an additive is easily introduced into PSCs without the need for thermal treatment, which is typically required by other additives, causing a negative effect on the efficiency. The CH 3 NH 3 PbI 3 -based PSC with butyl acrylate additive shows a superior PCE of 20.0%, 19% higher than that of the unmodified device (16.8%), as well as much improved moisture/thermal stability. Herein, a facile way is provided to enhance the PCE and stability of CH 3 NH 3 PbI 3 -based PSCs simultaneously, which facilitates the commercialization of PSCs.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jin Li,Ying Song,Yanna Wang,Hui Zhang
A series of hierarchical nanosheet array-like Co–Al layered double hydroxides (LDHs)/reduced graphene oxide (rGO) hybrid supported ultrafine PdCu nanocluster (NC) catalysts m-PdCux/LDHs/rGO (x: Cu/Pd molar ratio of 1.5, 3.0, and 5.5; m: Pd loadings of ∼0.80, 0.40, 0.11, and 0.01 wt %) were assembled via an ultrasonic-assisted NaBH4 reduction–sol immobilization strategy. The as-obtained catalysts display ultrafine PdCu alloy NCs with sizes of ∼0.9–1.8 nm finely tuned by both Cu/Pd ratios and Pd loadings and mainly distributed on the edge sites of LDH nanosheets and part of LDHs–rGO junctions upon the unique hierarchical nanosheet array-like structure. Three catalysts 0.85-PdCu1.5/LDHs/rGO, 0.83-PdCu3.0/LDHs/rGO, and 0.80-PdCu5.5/LDHs/rGO exhibit excellent Heck reactivity for iodobenzene with styrene, of which the 0.83-PdCu3.0/LDHs/rGO shows the highest activity, much higher than Pd/LDHs/rGO and single LDHs or GO supported PdCu3.0 catalysts, attributed to the ultrafine PdCu3.0 NCs, the largest electron density of the Pd0 center, and the strongest PdCu3.0 NCs–LDHs–rGO three-phase synergistic effect. The lowest Pd-loading sample 0.01-PdCu3.0/LDHs/rGO shows an unprecedented turnover frequency of 210 000 h–1 (Pd dosage: 2 × 10–5 mol %) with the highest value so far, excellent adaptability for substrates, and reusability. The present work provides a versatile method for designing hierarchically structured ultrafine Pd–M alloy NC catalysts for varied catalysis processes.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 2
·405
·
IF 5.076
Daocheng Hong,Mingyi Xie,Yuxi Tian
Solution-processed organometal halide perovskites (OMHPs) have been widely used in optoelectronic devices, and have exhibited brilliant performance. One of their generally recognized advantages is their easy fabrication procedure. However, such a procedure also brings uncertainty about the opto-electric properties of the final samples and devices, including morphology, stability, coverage ratio, and defect concentration. Normally, one needs to find a balanced condition, because there is a competitive relation between these parameters. In this work, we fabricated CH3NH3PbI3films by carefully changing the ratio of the PbI2to CH3NH3I, and found that the stoichiometric and solvent engineering not only determined the photoluminescence efficiency and defects in the materials, but also affected the photostability, morphology, and coverage ratio. Combining solvent engineering and the substitution of PbI2by Pb(Ac)2, we obtained an optimized fabrication condition, providing uniform CH3NH3PbI3films with both high photoluminescence efficiency and high photostability under either I-rich or Pb-rich conditions. These results provide an optimized fabrication procedure for CH3NH3PbI3and other OMHP films, which is crucial for the performance of perovskite-based solar cells and light emitting devices.Keywords:CH3NH3PbI3;stoichiometric modification;morphology;photostability;solvent engineering
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Surface Science Advances
·
2020
·
IF 0
Min Liu,Naiqiang Yan,Congyang Zhang,Liang Li
This work presents a novel integrated solar cell with non-toxic copper indium disulfide (CuInS 2 ) nanocrystals (NCs) and stacked polymer bulk heterojunction. This parallel tandem structure avoids the use of the additional interlayer. Through the morphology, structure characterization, and optical property of the prepared CuInS 2 NCs film and CuInS 2 /P3HT:PCBM integrated structure, it is demonstrated that the CuInS 2 NCs layers in the integrated solar cells are multifunctional, which not only act as a strong light absorber but also an efficient hole transporter. Compared to the neat polymer bulk heterojunction solar cells, the photovoltaic performance of the integrated solar cells has been improved.
✓ 已验证
产品关联
DOI
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Junyang Yin,Yujie Yuan,Jian Ni,Jiayi Guan,Xiaojun Zhou,Yue Liu,Yi Ding,Hongkun Cai,Jianjun Zhang
Obtaining a perovskite light-absorbing layer with good crystallization, low defect concentration, good stability, and well-matched energy levels is critical to obtaining high-efficiency perovskite solar cells (PSCs). Here, a hybrid PSC with a graded band gap is explored using MAPbBr3 (MA = CH3NH3) and MAPbBr0.9I2.1 quantum dots (QDs) as component cells. We have creatively designed a solar cell device with a double-QD structure [indium tin oxide (ITO)/SnO2/perovskite:MAPbBr3 QDs/MAPbBr0.9I2.1 QDs/Spiro-OMeTAD/Au]. A better crystal film of the perovskite absorption layer can be obtained because the MAPbBr3 QDs are doped in an antisolvent, which induces nucleation and growth in the polycrystalline perovskite. In addition, we expect that digestive ripening occurred in the crystallization, and the oleic acid ligands on the surface of the QDs disintegrate during the doping process and transfer to the surface of the perovskite absorption layer finally; it follows that the hydrophobicity and stability of the perovskite film are greatly enhanced. Moreover, a thin film of MAPbBr0.9I2.1 QDs is introduced between the perovskite absorption layer and the hole layer, acting as an energy-level ladder, which leads to well-matched energy levels, an increase in fill factor (FF), and an enhanced hole transport capability. In particular, the mechanism of the crystallization process involving the effect of oleic acid ligands on the interior and surface of the perovskite film is fully discussed here. The final research results from the PSCs show that both high efficiency and long-term stability are achieved successfully by this design strategy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Dandan Lu,Keyang Yin,Ya Zhao,Zelin Gao,Nicolas Godbert,Hongmei Li,Hongguang Li,Jingcheng Hao
The synthesis of carbon dots (CDs) has attracted much attention in recent years. In this article, alkylated, blue-emitting CDs are prepared from dodecylamine through pyrolysis in differently substituted benzene solvents. The influences of the solvent on the size, yield and fluorescence quantum yield of the CDs have been investigated in detail. Overall, eight solvents were probed. It was found that the presence of halogen atom(s) in the solvent structure is beneficial for the production of the CDs, as seen from the poor yields of the CDs obtained in methylated benzenes. For the three mono-substituted halogenated benzenes with Cl, Br, I, as the atomic number of the halogen atom increases, hence increasing the resulting polarizability of the medium, the quantity of CDs obtained after pyrolysis also increases. For the two dichlorobenzenes probed, only the ortho-substitution is advantageous for the production of the CDs. The major quantity of CDs was obtained in iodobenzene (∼26 %) while the highest fluorescence quantum yield was observed for CDs prepared in bromobenzene (∼24 %), which is almost 4 times and 3 times that of the CDs developed in the old strategy using chlorobenzene as a solvent. Not only the change of the solvent tunes the photophysical properties of the CDs, it also alters their chemical structure. While the mono-substituted solvent is conducive to CDs with enriched C = O, the di-substituted one facilitates instead the formation of C-O. The possible interaction between the alkylamine and the solvent during pyrolysis was probed by adding lewis base and lewis acid to the system. Evidence of the occurrence of a process similar to Friedel-Crafts alkylation has been found. Our research illustrates new synthetic pathways and mechanism analysis for the preparation of CDs.
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 14
·期 4
·1012-1017
·
IF 8.183
Chen Hongye,Wang Liaoyu,Shen Chun,Zhang Jiahuan,Guo Wanlin
The electron-ion coupling in iontronics has great significance and potential for energy conversion and storage devices. However, it is a substantial challenge to integrate iontronics into all-solid-state semiconductor circuits and explore the electron-ion coupling in semiconductor devices. Here, by utilizing the organic-inorganic halide perovskite, we fabricate a planar heterojunction with a gradient distribution of halide anions. The diode-like halide migration was investigated by bias voltage induced asymmetric blue shift in photoluminescence spectrum. This pseudo-ionic diode behaviour was found to result from asymmetric charge injection characterized by I–V curves and gradient-halides-induced vacancy hopping indicated by energy dispersive spectroscopy (EDS). The planar gradient perovskite heterojunction provides a viable route for extending iontronic devices into the regime of all-solid-state semiconductors.
✓ 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）