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Epitaxial quasi-2D/3D hybrid perovskite heterojunctions for photodetector with enhanced detectivity and stability

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Nano Research 2024年第7期17卷 6594-6602页

作者： Yifu Chen Lin Zhang Xinxin Peng Weiran Qin Shiqing Li Yingwei Wang Zhihui Chen Si Xiao Bin yang Biao Liu junliang yang Han Huang Yun Lin Jun He Liming Ding Yongbo Yuan Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of PhysicsCentral South UniversityChangsha 410083China Hunan Key Laboratory of Nanophotonics and Devices School of PhysicsCentral South UniversityChangsha 410083China College of Materials Science and Engineering Hunan UniversityChangsha 410082China Department of Photoelectric Information School of PhysicsCentral South UniversityChangsha 410083China Center for Excellence in Nanoscience Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyChinese Academy of ScienceBeijing 100190China

Although numerous metal halide perovskite materials have been investigated in the field of optoelectronic,the development of perovskite heterojunctions with exotic structures is still ***,we report the epitaxial growth of quasi-two-dimensional(Q-2D)perovskites on methylammonium lead iodide(MAPbI_(3))single crystals to form perovskite heterojunctions with interfacial *** MAPbI_(3)adjacent to epitaxial Q-2D perovskite shows blue shifted photoluminescence with shortened lifetime,which becomes significant with the reduced layer number of the Q-2D *** findings suggest the presence of an interfacial strain gradient leading to enhanced photocarrier ***,compared to the MAPbI_(3)single crystal detector,the BA_(2)MAPb_(2)I_(7)/MAPbI_(3)(BA:n-butylamine)heterojunction-based photodetector demonstrates a bandpass detecting property and exhibits 5 times enhanced external quantum efficiency and 83 times enhanced specific detectivity(D*=3.26×10^(11)Jones).Remarkably,the unencapsulated BA_(2)MAPb_(2)I_(7)/MAPbI_(3)heterojunction is stable in ambient condition for>300 *** Q-2D/3D heterojunction shows suppressed ion inter-diffusion due to the presence of Q-2D phase.

关键词： epitaxial growth interfacial strain quasi-two-dimensional/three-dimensional(Q-2D/3D)heterojunctions ion inter-diffusion

The issues on the commercialization of perovskite solar cells

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Materials Futures

Materials Futures 2024年第2期3卷 1-35页

作者： Lixiu Zhang Yousheng Wang Xiangchuan Meng Jia Zhang Pengfei Wu Min Wang Fengren Cao Chunhao Chen Zhaokui Wang Fu yang Xiaodong Li Yu Zou Xi Jin Yan Jiang Hengyue Li Yucheng Liu Tongle Bu Buyi Yan Yaowen Li Junfeng Fang Lixin Xiao junliang yang Fuzhi Huang Shengzhong Liu Jizhong Yao Liangsheng Liao Liang Li Fei Zhang Yiqiang Zhan Yiwang Chen Yaohua Mai Liming Ding Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190People’s Republic of China Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhou 510632People’s Republic of China Institute of Polymers and Energy Chemistry(IPEC) Nanchang UniversityNanchang 330031People’s Republic of China School of Information Science and Technology Fudan UniversityShanghai 200433People’s Republic of China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072People’s Republic of China School of Physical Science and Technology Soochow UniversitySuzhou 215006People’s Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123People’s Republic of China Institute of optoelectronics Fudan UniversityShanghai 200433People’s Republic of China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123People’s Republic of China School of Physics and Electronic Science East China Normal UniversityShanghai 200241People’s Republic of China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Department of PhysicsPeking UniversityBeijing 100871People’s Republic of China College of Biophotonics South China Normal UniversityGuangzhou 510631People’s Republic of China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Physics and Electronics Central South UniversityChangsha 410083People’s Republic of China School of Materials Science and Engineering Shaanxi Normal UniversityXi’an 710119People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Microquanta semiconductor Hangzhou 311121People’s Republic of China

Perovskite solar cells have aroused a worldwide research upsurge in recent years due to their soaring photovoltaic performance,ease of solution processing,and low *** power conversion efficiency record is constantly being broken and has recently reached 26.1%in the lab,which is comparable to the established photovoltaic technologies such as crystalline silicon,copper indium gallium selenide and cadmium telluride(CdTe)solar ***,perovskite solar cells are standing at the entrance of industrialization,where huge opportunities and risks ***,towards commercialization,challenges of up-scaling,stability and lead toxicity still remain,the proper handling of which could potentially lead to the widespread adoption of perovskite solar cells as a low-cost and efficient source of renewable *** review gives a holistic analysis of the path towards commercialization for perovskite solar cells.A comprehensive overview of the current state-of-the-art level for perovskite solar cells and modules will be introduced first,with respect to the module efficiency,stability and current status of *** will then discuss the challenges that get in the way of commercialization and the corresponding strategies to address them,involving the upscaling,the stability and the lead toxicity *** into the future direction of commercialization of perovskite photovoltaics was also provided,including the flexible perovskite cells and modules and perovskite indoor ***,the future perspectives towards commercialization are put forward.

关键词： commercializations perovskite solar cells state-of-the-art level challenges and perspectives indoor photovoltaics

前交叉韧带部分断裂对膝关节应力影响的三维有限元分析

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中国组织工程研究 2024年第9期28卷 1347-1353页

作者：杨骏良路坦徐彪姜亚琼王富成新乡医学院第一附属医院关节与创伤外科二病区新乡市骨关节退行性疾病研究重点实验室河南省卫辉市453100 新乡医学院第一附属医院泌尿外科河南省卫辉市453100

背景:前交叉韧带损伤容易导致继发性的半月板损伤和骨性关节炎,目前关于前交叉韧带损伤所致的半月板及关节软骨损伤力学研究较少。目的:利用有限元分析方法研究前交叉韧带部分断裂对膝关节内外侧半月板及关节软骨应力的影响。方法:选择... 详细信息

背景:前交叉韧带损伤容易导致继发性的半月板损伤和骨性关节炎,目前关于前交叉韧带损伤所致的半月板及关节软骨损伤力学研究较少。目的:利用有限元分析方法研究前交叉韧带部分断裂对膝关节内外侧半月板及关节软骨应力的影响。方法:选择一名健康志愿者的膝关节CT和MRI影像资料,将扫描数据导入Mimics、Geomagic及Solidworks软件,经配准融合后建立4种膝关节三维模型,分别为前交叉韧带完整、前交叉韧带后外侧束断裂、前交叉韧带前内侧束断裂及前交叉韧带缺失模型,最后导入Ansys软件,对膝关节施加4种模式荷载:在股骨顶端施加纵向荷载750 N;在股骨顶端施加纵向荷载750 N及胫骨后方134 N向前推力;在股骨顶端施加纵向荷载750 N及10 Nm内翻力矩,模拟膝内翻;在股骨近端面施加纵向荷载750 N及4 Nm内旋力矩,模拟膝内旋,进行膝关节半月板与软骨生物力学有限元分析。结果与结论:①在膝关节伸直状态下,在股骨顶端施加纵向荷载750 N时,前交叉韧带前内侧束断裂和缺失使半月板总体应力及其峰值明显增大,但其应力分布无明显变化,关节软骨应力无明显变化;在股骨顶端施加纵向荷载750 N及胫骨后方134 N向前推力时,前交叉韧带前内束断裂使胫骨前移增大,半月板后角受挤压应力增大,关节软骨应力无明显变化;模拟膝内翻时,前交叉韧带不同程度损伤较完整时的外侧半月板后角应力减小,内侧半月板应力增大,关节软骨应力稍减小;模拟膝内旋时,前交叉韧带前内束断裂及缺失使股骨软骨和胫骨软骨的等效应力峰值由内侧软骨转向外侧软骨,半月板应力峰值明显增大,此时对膝关节旋转稳定性起主导作用的是前交叉韧带前内侧束;②结果显示,在膝关节处于伸直站立位、内翻及内旋时,前交叉韧带前内侧束断裂患者继发半月板损伤的风险远大于后外侧束断裂患者,而对关节软骨的影响无明显差异。

关键词：前交叉韧带损伤有限元分析生物力学半月板关节软骨

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内侧副韧带不同程度损伤时膝关节的应力变化

中国组织工程研究 2024年第33期28卷 5270-5275页

作者：姜亚琼路坦徐彪杨骏良阴玉娇新乡医学院第一附属医院关节与创伤外科一病区新乡市骨关节退行性疾病研究重点实验室河南省卫辉市453100 新乡医学院第一附属医院手术一部河南省卫辉市453100

背景:膝关节内侧副韧带损伤易导致继发性的半月板及软骨损伤,长期慢性损害会引起骨关节炎的发生。目前,关于内侧副韧带断裂所致半月板及关节软骨损伤的力学研究较少。目的:探讨膝关节内侧副韧带不同程度损伤对膝关节半月板及软骨生物力... 详细信息

背景:膝关节内侧副韧带损伤易导致继发性的半月板及软骨损伤,长期慢性损害会引起骨关节炎的发生。目前,关于内侧副韧带断裂所致半月板及关节软骨损伤的力学研究较少。目的:探讨膝关节内侧副韧带不同程度损伤对膝关节半月板及软骨生物力学的影响。方法:选择一名健康志愿者行膝关节CT和MRI检查,获取其影像资料,将扫描数据依次导入Mimics、Geomagic及Solidworks软件,经配准融合后建立正常膝关节三维模型,并在此基础上模拟出膝关节内侧副韧带不同程度损伤的模型,共分为4组,包括:①内侧副韧带完整;②内侧副韧带深层断裂;③内侧副韧带浅层断裂;④内侧副韧带完全断裂。最后导入Ansys软件,对膝关节施加3种模式载荷:①股骨顶端施加10 N·m外翻力矩;②股骨顶端施加4 N·m内旋力矩;③股骨顶端施加4 N·m外旋力矩。分析4组模型在不同载荷下对膝关节生物力学的影响。结果与结论:①在膝关节伸直位,对膝关节施加10N·m外翻力矩时,内侧副韧带不同程度损伤后外侧半月板总体应力均增加,关节软骨应力变化不明显,并且当内侧副韧带浅层出现断裂后外侧半月板应力峰值明显增大;②在膝关节伸直位,对膝关节施加4 N·m内旋力矩时,内侧副韧带不同程度损伤后内外侧半月板总体应力均增加,当内侧副韧带浅层出现断裂时半月板应力峰值从内侧半月板前角转移至外侧半月板前角;③在膝关节伸直位,对膝关节施加4 N·m外旋力矩,内侧副韧带不同程度损伤后外侧半月板应力峰值较内侧半月板增加更明显,关节软骨应力变化较小;④结果表明,膝关节处于伸直状态下,膝关节内侧副韧带浅层断裂继发半月板损伤的风险远大于内侧副韧带深层断裂,而外侧半月板较内侧半月板更易受到损伤;内侧副韧带浅层和深层对膝关节的旋转稳定性均有重要作用。

关键词：膝关节内侧副韧带半月板有限元分析生物力学

Fully Roll‑to‑Roll Processed Efficient Perovskite Solar Cells via Precise Control on the Morphology of PbI_(2):CsI Layer

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Nano-Micro Letters 2022年第5期14卷 110-121页

作者： Hengyue Li Chuantian Zuo Dechan Angmo Hasitha Weerasinghe Mei Gao junliang yang Hunan Key Laboratory of Nanophotonics and Devices School of Physics and ElectronicsCentral South UniversityChangsha 410083People’s Republic of China Flexible Electronics Laboratory CSIRO ManufacturingClaytonVIC 3168Australia

Perovskite solar cells(PSCs)have attracted tremendous attention as a promising alternative candidate for clean energy *** attempts have been made with various deposition techniques to scale-up ***-die coating is a robust and facile deposition technique that can be applied in large-area roll-to-roll(R2R)fabrication of thin film solar cells with the advantages of high material utilization,low cost and high ***,we demonstrate the encouraging result of PSCs prepared by slot-die coating under ambient environment using a twostep sequential process whereby PbI_(2):CsI is slot-die coated first followed by a subsequent slot-die coating of organic cations containing solution.A porous PbI_(2):CsI film can promote the rapid and complete transformation into perovskite *** crystallinity and morphology of perovskite films are significantly improved by optimizing nitrogen blowing and controlling substrate temperature.A power conversion efficiency(PCE)of 18.13%is achieved,which is promising for PSCs fabricated by two-step fully slot-die-coated ***,PSCs with a 1 cm2 area yield a champion PCE of 15.10%.Moreover,a PCE of 13.00%is obtained on a flexible substrate by the roll-to-roll(R2R)coating,which is one of the highest reported cells with all layers except for metal electrode fabricated by R2R process under ambient condition.

关键词： Perovskite solar cells Slot-die coating Roll-to-roll Ambient condition Flexible

Organic additives in all-inorganic perovskite solar cells and modules:from moisture endurance to enhanced efficiency and operational stability

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Journal of Energy Chemistry 2022年第4期31卷 361-390页

作者： Yameen Ahmed Bilawal Khan MBilal Faheem Keqing Huang Yuanji Gao junliang yang State Key Laboratory of Powder Metallurgy School of Physics and ElectronicsCentral South UniversityChangsha 410083HunanChina Department of Materials Science and Engineering City University of HongkongHongkong SAR 999077China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina

Power conversion efficiency(PCE) of perovskite solar cells(PSC) has been skyrocketed to certified 25.5% owing to their improved and tunable optoelectronic properties. Although, various strategies have been adopted to date regarding PCE and stability enhancement within PSC technology, certain instability factors(moisture, heat, light) are hindering their commercial placement. Recently, all-inorganic PSCs got hype in the photovoltaic research community after they attained PCE > 20% and due to their significant endurance against heat and light mishmashes, but there only left moisture sensitivity as the only roadblock for their industrial integration. Here, we review the recent progress of additive inclusion into allinorganic(CsPbX_(3)) PSCs to stabilize their intrinsic structure and to withstand the performance limiting factors. We start with the detailed description of chemical instability of different perovskite compositions, phase segregation, and how organic molecules and dyes help to repair the structural defects to improve the overall PCE and stability of PSCs. Moisture endurance as a result of chemical passivation through organic additives, low-dimensional inorganic PSCs to enhance device stability and scalable fabrication of CsPbX_(3) PSCs are also reviewed. The challenges of module degradation and design implications with proposed strategies and outlook are interpreted in the ending phrases of this review.

关键词： Perovskite solar cells Organic additives Chemical instability Phase segregation Modules

Crystallization and Orientation Modulation Enable Highly Efficient Doctor-Bladed Perovskite Solar Cells

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Nano-Micro Letters 2023年第10期15卷 40-52页

作者： Jianhui Chang Erming Feng Hengyue Li yang Ding Caoyu Long Yuanji Gao Yingguo yang Chenyi Yi Zijian Zheng junliang yang Hunan Key Laboratory of Nanophotonics and Devices School of Physics and ElectronicsCentral South UniversityChangsha 410083HunanPeople’s Republic of China Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204People’s Republic of China Department of Electrical Engineering Tsinghua UniversityBeijing 100084People’s Republic of China Department of Applied Biology and Chemical Technology Faculty of ScienceThe Hong Kong Polytechnic UniversityHong Kong 999077People’s Republic of China

With the rapid rise in perovskite solar cells(PSCs)performance,it is imperative to develop scalable fabrication techniques to accelerate potential ***,the power conversion efficiencies(PCEs)of PSCs fabricated via scalable two-step sequential deposition lag far behind the state-of-the-art spin-coated ***,the additive methylammonium chloride(MACl)is introduced to modulate the crystallization and orientation of a two-step sequential doctorbladed perovskite film in ambient *** can significantly improve perovskite film quality and increase grain size and crystallinity,thus decreasing trap density and suppressing nonradiative ***,MACl also promotes the preferred face-up orientation of the(100)plane of perovskite film,which is more conducive to the transport and collection of carriers,thereby significantly improving the fill *** a result,a champion PCE of 23.14%and excellent longterm stability are achieved for PSCs based on the structure of ITO/SnO_(2)/FA_(1-x)MA_xPb(I_(1-y)Br_y)_3/Spiro-OMeTAD/*** superior PCEs of 21.20%and 17.54%are achieved for 1.03 cm~2 PSC and 10.93 cm~2 mini-module,*** results represent substantial progress in large-scale two-step sequential deposition of high-performance PSCs for practical applications.

关键词： Crystallization regulation Orientation modulation Perovskite solar cells Doctor-blading Ambient condition

离子液体界面修饰的高效稳定FAPbI_(3)钙钛矿太阳能电池

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物理化学学报 2024年第6期40卷 34-37页

作者： Yameen Ahmed 封想想高远基丁洋龙操玉 Mustafa Haider 李恒月李专黄誓成 Makhsud I.Saidaminov 阳军亮中南大学物理与电子学院超微结构与超快过程湖南省重点实验室长沙410083 中南大学粉末冶金国家重点实验室长沙410083 广西晶联光电材料有限公司广西柳州545036 中南大学材料科学与工程学院长沙410083 Department of Electrical&Computer Engineering University of Victoria3800 Finnerty RoadVictoriaBritish Columbia V8P 5C2Canada Department of Chemistry University of Victoria3800 Finnerty RoadVictoriaBritish Columbia V8P 5C2Canada

碘铅甲眯(FAPbI_(3))钙钛矿太阳能电池因其优异的光伏性能而受到广泛关注,但器件的长期稳定性仍然是FAPbI_(3)太阳能电池的关键问题。FAPbI_(3)黑色钙钛矿相在室温下会相变为黄色非钙钛矿相,且水分会加速这一相变。界面工程是提高钙钛... 详细信息

碘铅甲眯(FAPbI_(3))钙钛矿太阳能电池因其优异的光伏性能而受到广泛关注,但器件的长期稳定性仍然是FAPbI_(3)太阳能电池的关键问题。FAPbI_(3)黑色钙钛矿相在室温下会相变为黄色非钙钛矿相,且水分会加速这一相变。界面工程是提高钙钛矿太阳能电池稳定性的常用方法之一。作为绿色溶剂,离子液体被认为是有毒界面修饰剂的潜在替代品,这也提高了它们的商业可行性,并加速了它们在可再生能源市场的应用。本研究利用具有低挥发性、低毒性、高导电性和高热稳定性的离子液体1-乙基-3-甲基咪唑四氟硼酸盐(EMIM[BF_(4)])来修饰钙钛矿太阳能电池的电子传输层和钙钛矿层之间的界面。离子液体的引入不仅减少了界面缺陷,而且提高了钙钛矿薄膜的质量。密度泛函理论计算表明,离子液体与钙钛矿表面之间存在较强的界面相互作用,有利于降低钙钛矿表面缺陷态密度,稳定钙钛矿晶格。除钙钛矿薄膜缺陷外,溶液处理的SnO_(2)也存在表面缺陷。在SnO_(2)表面的缺陷产生缺陷态,也会导致能带对准问题和稳定性问题。密度泛函理论计算表明,有离子液体的表面间隙态比没有离子液体的表面间隙态小,这种减弱的表面间隙态表明表面区域载流子复合减少,有利于提高器件性能。因此,我们实现了功率转换效率大于22%的离子液体修饰的FAPbI_(3)钙钛矿太阳能电池(对照21%)。在相对湿度~20%的干箱中存放1800h以上后,冠军器件保留了初始状态的~90%,而控制器件降解为非钙钛矿黄色六方相(δ-FAPbI_(3))。

关键词： FAPbI_(3) 相稳定性 SnO_(2) 钙钛矿太阳能电池离子液体界面工程

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Nickel-Catalyzed Regio-and Stereoselective Defluorinative Arylation of gem-Difluorinated Cyclopropanes

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Chinese Journal of Chemistry 2024年第8期42卷 823-828页

作者： Shutao Qi Yunkai Hua Liangkai Pan Junfeng yang junliang Zhang Department of Chemistry Fudan University2005 Songhu RoadShanghai200438 China Fudan Zhangjiang Institute Shanghai201203 China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiangHenan 453007China

Comprehensive Summary,Herein,we report nickel-catalyzed cross-coupling of gem-difluorinated cyclopropanes with boronic acids,providing the corresponding arylated 2-fluoroallylic *** approach used commercially available phosphine ligand Xantphos to obtain monofluorinated alkenes with high regioselectivity and *** studies proposed a Ni(II)-fluoroallyl pathway and excluded the radical pathway.

关键词： Nickel Monofluoroolefin Cyclopropane Regioselectivity Stereoselectivity C-C coupling Cross-coupling Synthetic methods