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Improving open-circuit voltage and short-circuit current of high-efficiency silicon-based planar heterojunction solar cells by combining V_(2)O_(5)with PEDOT:PSS

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Journal of Materiomics 2023年第3期9卷 438-446页

作者： Zhiting Luo Chen Yang Xiuhua Chen Wenhui Ma Shaoyuan Li Kaixin Fu School of materials and Energy Yunnan UniversityYunnan650500China Yunnan Silicon Materials Engineering Technology Research Center Kunming University of Science and Technology650093China National Joint International research center for Optoelectronic Energy materials Yunnan UniversityYunnan650500China

In recent years,a novel PEDOT:PSS/n-Si planar heterojunction solar cell has been extensively studied in the photovoltaic field.Different V_(2)O_(5)-IPA concentrations mixed in PEDOT:PSS samples as hole transport layer were prepared by means of spin coating technique and mechanical mixing of organic and inorganic materials.V_(2)O_(5)was studied for its effects on the surface morphology,chemical composition,and optical transmittance of PEDOT:PSS films.The findings of the study show that the addition of V_(2)O_(5)particles changes the surface morphology of PEDOT:PSS films and promotes its superior ohmic contact with the Si interface.Furthermore,PEDOT:PSS incorporated with V_(2)O_(5)particles that have outstanding optical and semiconductor properties reduces the rate of carrier recombination at the device interface and blocks electron transport to the anode in the fabricated Si-based solar cells.When compared to conventional PEDOT:PSS/Si planar heterojunction solar cells,the fill factor,photoelectric conversion efficiency,open-circuit voltage,and short-circuit current density of the devices prepared in this study can be significantly improved,reaching up to 70.98%,15.17%,652 mV and 32.8 mA/cm^(2),respectively.This research provides a promising and effective method for improving the photoelectric conversion performance of PEDOT:PSS/Si heterojunction solar cells,which enables the application of V_(2)O_(5)in Si solar cells.

关键词： Si PEDOT:PSS Heterojunction photovoltaic devices V_(2)O_(5)-IPA High conductivity Semiconductor film

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Centimeter-sized Cs_(3)Cu_(2)I_(5)single crystals grown by oleic acid assisted inverse temperature crystallization strategy and their films for high-quality X-ray imaging

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Journal of Energy Chemistry 2023年第4期79卷 382-389页

作者： Tao Chen Xin Li Yong Wang Feng Lin Ruliang Liu Wenhua Zhang Jie Yang Rongfei Wang Xiaoming Wen Bin Meng Xuhui Xu Chong Wang National center for International research on Photoelectric and Energy materials School of Materials and EnergyYunnan UniversityKunming 650091YunnanChina College of materials Science and engineering Key Laboratory of Advanced Materials of Yunnan ProvinceKunming University of Science and TechnologyKunming 650093YunnanChina Centre for Translational Atomaterials Swinburne University of TechnologyHawthorn 3122Australia

Low-dimensional halide perovskites have become the most promising candidates for X-ray imaging,yet the issues of the poor chemical stability of hybrid halide perovskite,the high poisonousness of lead halides and the relatively low detectivity of the lead-free halide perovskites which seriously restrain its commercialization.Here,we developed a solution inverse temperature crystal growth(ITCG)method to bring-up high quality Cs_(3)Cu_(2)I_(5)crystals with large size of centimeter order,in which the oleic acid(OA)is introduced as an antioxidative ligand to inhibit the oxidation of cuprous ions effieiently,as well as to decelerate the crystallization rate remarkalby.Based on these fine crystals,the vapor deposition technique is empolyed to prepare high quality Cs_(3)Cu_(2)I_(5)films for efficient X-ray imaging.Smooth surface morphology,high light yields and short decay time endow the Cs_(3)Cu_(2)I_(5)films with strong radioluminescence,high resolution(12 lp/mm),low detection limits(53 nGyair/s)and desirable stability.Subsequently,the Cs_(3)Cu_(2)I_(5)films have been applied to the practical radiography which exhibit superior X-ray imaging performance.Our work provides a paradigm to fabricate nonpoisonous and chemically stable inorganic halide perovskite for X-ray imaging.

关键词： Inverse temperature crystal growth Cs_(3)Cu_(2)I_(5)single crystal Vapor deposition Cs_(3)Cu_(2)I_(5)films X-ray imaging

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Revealing the dominant factor of domain boundary resistance on bulk conductivity in lanthanum lithium titanates

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Journal of Energy Chemistry 2022年第10期31卷 354-359,I0009页

作者： Xuefeng Zhou Cong Gao Dandan Wang Shang Peng Lujun Huang Wenge Yang Wen-Hua Zhang Xiang Gao Sichuan research center of New materials Institute of Chemical MaterialsChina Academy of Engineering PhysicsChengdu 610200SichuanChina center for High Pressure Science and technology Advanced research Beijing 100094China School of materials Science and engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina School of materials and Energy Yunnan UniversityKunming 650500YunnanChina

Perovskite-type lithium lanthanum titanates(LLTO)display a high bulk ionic conductivity and are considered a promising electrolyte for building up to advanced solid-state Li-ion batteries.The LLTO crystals contain a high concentration of intrinsically formed 90ο-rotated domain boundaries(DBs)serving as barriers to bulk Li-ion conduction.However,the mechanism of how the DB concentration and DB resistance can compete with each other to determine the bulk conductivity of LLTO is still unknown.Here we report a comprehensive study of LLTO compounds,aimed to unravel the mechanism and hence explore new path(s)for further improving the conductivity of this material.Our results show that both the sintering temperature and chemical composition can affect significantly the domain structures in LLTO.It is found that a decrease in the DB concentration is always accompanied by increased DB resistance due to the increased lattice mismatch at DBs,and vice versa.By unifying the electrochemical impedance spectroscopy and transmission electron microscopy analysis,it is clearly shown that the high DB resistance,instead of DB concentration,acts as the dominant factor governing the bulk conductivity of LLTO.The results thus renew the conventional understanding of the bulk Li-ion conduction in LLTO and shed light on developing novel LLTO electrolyte materials with improved ionic conductivity.

关键词： Solid electrolyte La_(2)/_(3-x)Li_(3x)TiO_(3) Conductivity Domain Domain boundary

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Remarkable synergistic effect in cobalt-iron nitride/alloy nanosheets for robust electrochemical water splitting

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Journal of Energy Chemistry 2022年第2期31卷 405-414页

作者： Mingpeng Chen Di Liu Baoye Zi Yuyun Chen Dong Liu Xinyu Du Feifei Li Pengfei Zhou Ye Ke Jielei Li Kin Ho Lo Chi Tat Kwok Weng Fai Ip Shi Chen Shuangpeng Wang Qingju Liu Hui Pan Institute of Applied Physics and materials engineering University of MacaoMacaoChina yunnan Key Laboratory for Micro/Nano materials&technology National Center for International Research on Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091YunnanChina Department of Electromechanical engineering Faculty of Science and TechnologyUniversity of MacaoMacaoChina Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoMacaoChina

Design and synthesis of noble-metal-free bifunctional catalysts for efficient and robust electrochemical water splitting are of significant importance in developing clean and renewable energy sources for sustainable energy consumption.Herein,a simple three-step strategy is reported to construct cobalt-iron nitride/alloy nanosheets on nickel foam(CoFe-NA/NF)as a bifunctional catalyst for both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).The electrocatalyst with optimized composition(CoFe-NA2/NF)can achieve ultralow overpotentials of 73 mV and 250 mV for HER and OER,respectively,at a current density of 10 mA cm^(-2) in 1 M KOH.Notably,the electrolyzer based on this electrocatalyst is able to boost the overall water splitting with a cell voltage of 1.564 V to deliver 10 mA cm^(-2) for at least 50 h without obvious performance decay.Furthermore,our experiment and theoretical calculation demonstrate that the combination of cobalt-iron nitride and alloy can have low hydrogen adsorption energy and facilitate water dissociation during HER.In addition,the surface reconstruction introduces metal oxyhydroxides to optimize the OER process.Our work may pave a new pathway to design bifunctional catalysts for overall water splitting.

关键词： Bifunctional electrocatalyst Metal nitride/alloy nanocomposite Overall water splitting High performance

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Highly Durable Ag-CuO Heterostructure-Decorated Mesh for Efficient Oil/Water Separation and In Situ Photocatalytic Dye Degradation

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Energy & Environmental materials 2021年第4期4卷 611-619页

作者： Jiakai Li Changpeng Lv Xuehua Liu Zhengbo Jiao Na Liu College of materials Science and engineering Institute of Materials for Energy and EnvironmentQingdao UniversityQingdao 266071China Anhui Provincial engineering Laboratory of silicon-based materials Engineering Technology Research Center of Silicon-based Materials AnhuiSchool of Material and Chemical EngineeringBengbu UniversityBengbu 233030China

It is of great necessity yet still a challenge to develop superwetting functional interfacial materials for simultaneously separating insoluble oil and degrading soluble dye pollutants in practical wastewater.In this work,a Ag-CuO heterostructure-decorated mesh was fabricated via facile alkali etchingcalcination and photoreduction approaches.The as-synthesized mesh with superhydrophilicity and underwater superoleophobicity displayed high separation efficiency(>99.998%)for diverse oil/water mixtures.Besides,it demonstrated more superior photocatalytic performance in dye degradation than those of bare CuO nanostructure-coated materials,which is primarily attributed to the intensive visible light harvesting and efficient electron-holes separation occurred on noble metal-semiconductor heterostructures.Furthermore,on account of the tenacity of Cu substrate as well as enhanced structural stability,this binary composite-decorated mesh exhibited highly reliable durability and robustness after 10 cycles of photocatalytic degradation tests,and even being ultrasonic worn for 30 min.More importantly,our developed mesh was capable of in situ catalytic degrading water-soluble organic dyes during oil/water separation under visible light irradiation.Therefore,such a dexterous and feasible strategy may afford a new route to construct bifunctional and predurable materials for actual sewage purification.

关键词： Ag-CuO heterostructures highly durable in situ bifunctional oil/water separation photocatalytic dye degradation

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Separation and enrichment mechanism of C54–TiSi_(2) from hypoeutectic Ti–65 wt.%Si alloy during directional solidification via alternating electromagnetic fields

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Journal of Iron and Steel research(International) 2021年第1期28卷 29-37页

作者： Kui‑song Zhu Jing‑fei Hu Wen‑hui Ma Kui‑xian Wei Yong‑nian Dai The National engineering Laboratory for Vacuum Metallurgy State Key Laboratory of Complex Nonferrous Metal Resources Clean UtilizationKunming University of Science and TechnologyKunming 650093YunnanChina College of Vanadium and Titanium Panzhihua UniversityPanzhihua 617000SichuanChina Key Laboratory for Nonferrous Vacuum Metallurgy of yunnan Province Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial UniversitiesKunming University of Science and TechnologyKunming 650093YunnanChina

The effects of directional solidification parameters and the coupling of directional solidification parameters and alternating electromagnetic fields on separation and enrichment of the C54–TiSi2 phase were investigated in a directionally solidified hypoeutectic Ti–65 wt.%Si alloy.The results indicated that by increasing the pull-down velocity at a given position within the ingot,the cooling rate,growth rate,and temperature gradient of ingot could be increased.At a pull-down velocity near 5μm/s,the temperature gradient,cooling rate,and growth rate decreased with increasing the thickness of the C54–TiSi2-rich layer.Electromagnetic fields enhanced mass transfer at pull-down velocities of 5,10,15,and 20μm/s,with resulting enriched layer thicknesses of 15,10,10,and 5 mm,respectively.By increasing the percentage of Ti in the Ti–Si alloy from 25 to 35 wt.%,the thickness of the C54–TiSi2-rich layer was increased from 2.5 to 3.3 cm.However,the maximum C54–TiSi2 content obtained experimentally in this layer decreased from 92.06 to 79.49 mass%.

关键词： Ti–Si alloy Directional solidification Electromagnetic field Separation C54–TiSi2

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Modulating CsPbl_(3)crystallization by using diammonium agent for efficient solar cells

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SusMat 2023年第6期3卷 894-908页

作者： Junming Qiu Qisen Zhou Mei Yu Jianhua Liu Rongshan Zhuang Yong Hua Liming Ding Xiaoliang Zhang School of materials Science and engineering Beihang UniversityBeijingChina yunnan Key Laboratory for Micro/Nano materials&technology School of Materials and EnergyYunnan UniversityKunmingChina National center for Nanoscience and technology BeijingChina

Cesium lead triiodide(CsPbI_(3))perovskite receives tremendous attention for photovoltaic applications,owing to its remarkable thermal stability and optoelectronic properties.However,realizing the CsPbI_(3)perovskite with high black-phase stability and optoelectronic properties remains a significant challenge,which largely affects the photovoltaic performance of perovskite solar cells(PSCs).Herein,aromatic ammonium agents are used to modulate the crystallization of the CsPbI_(3)perovskite to improve its black-phase stability and optoelectronic properties for efficient PSCs.Systemically experimental studies and comprehensively theoretical calculations are performed,which reveal that histammonium dihydrochloride(HACl_(2))could strongly couple with the perovskite during its crystallization,leading to faster nucleation and slower perovskite growth,and thus modulating the crystallization dynamics of the perovskites.Moreover,the residual diammonium cations(HA^(2+))distributed at the grain boundaries and on the surface of the perovskites can effectively passivate defects through electrostatic interactions,substantially suppressing trap-assisted nonradiative recombination,and prompting more matched perovskite surface energetics.Consequently,the photovoltaic performance of CsPbI_(3)PSCs is largely improved because of a combination of enhanced crystallinity and optoelectronic properties of the perovskites.This work offers a new avenue to prepare inorganic perovskites with high optoelectronic properties for photovoltaics.

关键词： crystallization modulation CsPbI_(3) diammonium salt optoelectronic property perovskite solar cells

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Residual alkali-evoked cross-linked polymer layer for anti-air-sensitivity LiNi_(0.89)Co_(0.06)Mn_(0.05)O_(2)cathode

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Journal of Energy Chemistry 2024年第5期92卷 450-458页

作者： Chao Zhao Xuebao Li Yun Zhao Jingjing He Yuanpeng Cao Wei Luo Ding Wang Jianguo Duan Xianshu Wang Baohua Li National and Local Joint engineering research center of Lithium-ion Batteries and materials Preparation technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093YunnanChina School of materials Science and engineering Central South UniversityChangsha 410083HunanChina Institute of materials research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055Guangdong China City College Kunming University of Science and TechnologyKunming 650051YunnanChina

High-energy density lithium-ion batteries(LIBs)with layered high-nickel oxide cathodes(LiNi_(x)Co_(y)Mn_(1-x-y)O_(2),x≥0.8)show great promise in consumer electronics and vehicular applications.However,LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)faces challenges related to capacity decay caused by residual alkalis owing to high sensitivity to air.To address this issue,we propose a hazardous substances upcycling method that fundamentally mitigates alkali content and concurrently induces the emergence of an anti-air-sensitive layer on the cathode surface.Through the neutralization of polyacrylic acid(PAA)with residual alkalis and then coupling it with 3-aminopropyl triethoxysilane(KH550),a stable and ion-conductive cross-linked polymer layer is in situ integrated into the LiNi_(0.89)Co_(0.06)Mn_(0.05)O_(2)(NCM)cathode.Our characterization and measurements demonstrate its effectiveness.The NCM material exhibits impressive cycling performance,retaining 88.4%of its capacity after 200 cycles at 5 C and achieving an extraordinary specific capacity of 170.0 mA h g^(-1) at 10 C.Importantly,this layer on the NCM efficiently suppresses unfavorable phase transitions,severe electrolyte degradation,and CO_(2)gas evolution,while maintaining commendable resistance to air exposure.This surface modification strategy shows widespread potential for creating air-stable LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)cathodes,thereby advancing high-performance LIBs.

关键词： Lithium-ion batteries Nickel-rich layered cathode Residual alkalis Cross-linked polyme rmodification Airsensitivity

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Boron removal from metallurgical-grade silicon by CaO–SiO_2 slag refining

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Rare Metals 2015年第7期34卷 522-526页

作者： Kui-Xian Wei Hai-Fei Lu Wen-Hui Ma Yan-Long Li Zhao Ding Ji-Jun Wu Yong-Nian Dai The National engineering Laboratory for Vacuum Metallurgy and State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Key Laboratory for Nonferrous Vacuum Metallurgy of yunnan Province and engineering research center for silicon Metallurgy and silicon materials of yunnan Provincial Universities Kunming University of Science and Technology

Boron removal from metallurgical-grade silicon(MG-Si) using CaO–SiO2 slag was studied by employing a medium-frequency electromagnetic induction furnace.The relationship between the optical basicity(K)of the CaO–SiO2 slag and the distribution coefficient of boron(LB) was investigated.Consequently, the local minimum and maximum LBvalues of 0.72 and 1.58 are obtained when K = 0.56 and K = 0.71, respectively.The boron content in MG-Si decreases gradually with refinement time increasing, down to a minimum value of4.73 9 10-6.The controlling step in the removal of boron from MG-Si is not the chemical reaction at the interface of the slag and silicon.Instead, the controlling step is a diffusion mass transfer, in which boron impurities diffuse from molten silicon to the interface of the slag and silicon,or B2O3 formed by the chemical reaction diffuses from the slag–silicon interface to molten slag.

关键词： Metallurgical-grade silicon Boron removal Slag ref

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Enhanced efficiency of graphene-silicon Schottky junction solar cell through inverted pyramid arrays texturation

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Journal of materials Science & technology 2018年第11期34卷 2197-2204页

作者： Jiajia Qiu Yudong Shang Xiuhua Chen Shaoyuan Li Wenhui Ma Xiaohan Wan Jia Yang Yun Lei Zhengjie Chen State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Faculty of Physical Science and technology Yunnan University Institute of New Energy/silicon Metallurgy and silicon Material engineering research center of Universities in yunnan Province Kunming University of Science and Technology

Nanostructures of silicon are gradually becoming hot candidate due to outstanding capability for trapping light and improving conversion efficiency of solar cell. In this paper, silicon nanowires（SiNWs） and silicon inverted pyramid arrays（SiIPs） were introduced on surface of Gr-Si solar cell through silver and copper-catalyzed chemical etching, respectively. The effects of SiNWs and SiIPs on carrier lifetime, optical properties and efficiency of Gr-SiNWs and Gr-SiIPs solar cells were systematically analyzed. The results show that the inverted pyramid arrays have more excellent ability for balancing antireflectance loss and surface area enlargement. The power conversion efficiency（PCE） and carrier lifetime of Gr-SiIPs devices respectively increase by 62% and 34% by comparing with that of Gr-SiNWs solar cells. Finally, the Gr-SiIPs cell with PCE of 5.63% was successfully achieved through nitric acid doping. This work proposes a new strategy to introduce the inverted pyramid arrays for improving the performance of Gr-Si solar cells.

关键词： Graphene-Si solar cell Silver/copper-assisted chemical etching silicon nanowires silicon inverted pyramid arrays

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