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131.
SrCl2 Derived Perovskite Facilitating a High Efficiency of 16% in Hole‐Conductor‐Free Fully Printable Mesoscopic Perovskite Solar Cells 下载免费PDF全文
Hua Zhang Huan Wang Spencer T. Williams Dehua Xiong Wenjun Zhang Chu‐Chen Chueh Wei Chen Alex K.‐Y. Jen 《Advanced materials (Deerfield Beach, Fla.)》2017,29(15)
Despite the breakthrough of over 22% power conversion efficiency demonstrated in organic–inorganic hybrid perovskite solar cells (PVSCs), critical concerns pertaining to the instability and toxicity still remain that may potentially hinder their commercialization. In this study, a new chemical approach using environmentally friendly strontium chloride (SrCl2) as a precursor for perovskite preparation is demonstrated to result in enhanced device performance and stability of the derived hole‐conductor‐free printable mesoscopic PVSCs. The CH3NH3PbI3 perovskite is chemically modified by introducing SrCl2 in the precursor solution. The results from structural, elemental, and morphological analyses show that the incorporation of SrCl2 affords the formation of CH3NH3PbI3(SrCl2)x perovskites endowed with lower defect concentration and better pore filling in the derived mesoscopic PVSCs. The optimized compositional CH3NH3PbI3(SrCl2)0.1 perovskite can substantially enhance the photovoltaic performance of the derived hole‐conductor‐free device to 15.9%, outperforming the value (13.0%) of the pristine CH3NH3PbI3 device. More importantly, the stability of the device in ambient air under illumination is also improved. 相似文献
132.
Yu-Ting Yen Yi-Kai Lin Shu-Hao Chang Hwen-Fen Hong Hsing-Yu Tuan Yu-Lun Chueh 《Nanoscale research letters》2013,8(1):329
This work presents the systematic studies of bulk hybrid heterojunction solar cells based on Cu(In, Ga)Se2 (CIGS) nanocrystals (NCs) embedded in poly(3-hexylthiophene) matrix. The CIGS NCs of approximately 17 nm in diameter were homogeneously blended with P3HT layer to form an active layer of a photovoltaic device. The blend ratios of CIGS NCs to P3HT, solvent effects on thin film morphologies, interface between P3HT/CIGS NCs and post-production annealing of devices were investigated, and the best performance of photovoltaic devices was measured under AM 1.5 simulated solar illumination (100 mW/cm2). 相似文献
133.
Hsin-Wei Huang Chen-Fang Kang Fang-I Lai Jr-Hau He Su-Jien Lin Yu-Lun Chueh 《Nanoscale research letters》2013,8(1):483
We report a stability scheme of resistive switching devices based on ZnO films deposited by radio frequency (RF) sputtering process at different oxygen pressure ratios. I-V measurements and statistical results indicate that the operating stability of ZnO resistive random access memory (ReRAM) devices is highly dependent on oxygen conditions. Data indicates that the ZnO film ReRAM device fabricated at 10% O2 pressure ratio exhibits the best performance. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) of ZnO at different O2 pressure ratios were investigated to reflect influence of structure to the stable switching behaviors. In addition, PL and XPS results were measured to investigate the different charge states triggered in ZnO by oxygen vacancies, which affect the stability of the switching behavior. 相似文献
134.
Various quantities of non-toxic monomer (2-hydroxyethyl methacrylate, HEMA) was added to form porous alumina ceramic by gel casting process. Pure water, monomer, cross-linker (N, N'-methylene-bis-acrylamide (MBAm)), and dispersant (ammonium salt of poly (methacrylic acid), PAS) were combined to form an aqueous solution, which added alumina powder and was milled to form alumina slurry with zirconia balls for 240 minutes. An initiator (ammonium persulfate, APS) was added to the alumina slurry with a vacuum mi... 相似文献
135.
Strength and conductivity ofin situ Cu-Fe alloys 总被引:3,自引:0,他引:3
Alloys of Cu-Fe with iron contents from 10 to 30 wt % have been prepared by casting plus mechanical reduction. A series of heat treatments was done at various stages of the mechanical reduction to promote precipitation of the iron from the copper matrix with the hope of optimizing electrical conductivity at a given strength level. A curve of optimum tensile strength against electrical conductivity was determined. It was found to lie significantly below the available data for Cu-Nb alloys and it is suggested that further improvements may be possible in Cu-Fe alloys by improved thermal mechanism processing. 相似文献
136.
Early nursing reforms in the 19th century are usually associated with Nightingale, although later emphasis has been placed on similar movements in the Poor Law sector. Extension of nursing influence over decision-making in terms of nursing practice and education is charted, using examples from 19th century Minutes of hospital committees and more recent experience based mainly on the observations made by one of the writers, who had substantial input into steering the hospital through the stages prior to achieving National Health Service (NHS) Trust status. The significance of nurse executive power following the 1990s NHS reforms is highlighted and means of extending the use of this authority are explored. 相似文献
137.
138.
Electrocatalysis: Wafer Scale Phase‐Engineered 1T‐ and 2H‐MoSe2/Mo Core–Shell 3D‐Hierarchical Nanostructures toward Efficient Electrocatalytic Hydrogen Evolution Reaction (Adv. Mater. 44/2016) 下载免费PDF全文
139.
I-Hsiang Chao Yu-Ting Yang Ming-Hsuan Yu Chiung-Han Chen Chwen-Haw Liao Bi-Hsuan Lin I-Chih Ni Wen-Chang Chen Anita W. Y. Ho-Baillie Chu-Chen Chueh 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(20):2207734
Two-dimensional (2D) tin (Sn)-based perovskites have recently received increasing research attention for perovskite transistor application. Although some progress is made, Sn-based perovskites have long suffered from easy oxidation from Sn2+ to Sn4+, leading to undesirable p-doping and instability. In this study, it is demonstrated that surface passivation by phenethylammonium iodide (PEAI) and 4-fluorophenethylammonium iodide (FPEAI) effectively passivates surface defects in 2D phenethylammonium tin iodide (PEA2SnI4) films, increases the grain size by surface recrystallization, and p-dopes the PEA2SnI4 film to form a better energy-level alignment with the electrodes and promote charge transport properties. As a result, the passivated devices exhibit better ambient and gate bias stability, improved photo-response, and higher mobility, for example, 2.96 cm2 V−1 s−1 for the FPEAI-passivated films—four times higher than the control film (0.76 cm2 V−1 s−1). In addition, these perovskite transistors display non-volatile photomemory characteristics and are used as perovskite-transistor-based memories. Although the reduction of surface defects in perovskite films results in reduced charge retention time due to lower trap density, these passivated devices with better photoresponse and air stability show promise for future photomemory applications. 相似文献
140.
Uniform Luminous Perovskite Nanofibers with Color‐Tunability and Improved Stability Prepared by One‐Step Core/Shell Electrospinning 下载免费PDF全文
Ping‐Chun Tsai Jung‐Yao Chen Ender Ercan Chu‐Chen Chueh Shih‐Huang Tung Wen‐Chang Chen 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(22)
A one‐step core/shell electrospinning technique is exploited to fabricate uniform luminous perovskite‐based nanofibers, wherein the perovskite and the polymer are respectively employed in the core and the outer shell. Such a coaxial electrospinning technique enables the in situ formation of perovskite nanocrystals, exempting the needs of presynthesis of perovskite quantum dots or post‐treatments. It is demonstrated that not only the luminous electrospun nanofibers can possess color‐tunability by simply tuning the perovskite composition, but also the grain size of the formed perovskite nanocrystals is largely affected by the perovskite precursor stoichiometry and the polymer solution concentration. Consequently, the optimized perovskite electrospun nanofiber yields a high photoluminescence quantum yield of 30.9%, significantly surpassing the value of its thin‐film counterpart. Moreover, owing to the hydrophobic characteristic of shell polymer, the prepared perovskite nanofiber is endowed with a high resistance to air and water. Its photoluminescence intensity remains constant while stored under ambient environment with a relative humidity of 85% over a month and retains intensity higher than 50% of its initial intensity while immersed in water for 48 h. More intriguingly, a white light‐emitting perovskite‐based nanofiber is successfully fabricated by pairing the orange light‐emitting compositional perovskite with a blue light‐emitting conjugated polymer. 相似文献