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Stabilizing semi-transparent perovskite solar cells with a polymer composite hole transport layer

Nano Research 2024年第3期17卷 1500-1507页

作者： Yongbin Jin Huiping Feng Zheng Fang liu Yang kaikai liu Bingru Deng Jingfu Chen Xueling Chen Yawen Zhong Jinxin Yang Chengbo Tian Liqiang Xie Zhanhua Wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China

Semi-transparent perovskite solar cells(ST-PSCs)have broad applications in building integrated photovoltaics.However,the stability of ST-PSCs needs to be improved,especially in n-i-p ST-PSCs since the doped 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene(Spiro-OMeTAD)is unstable at elevated temperatures and high humidity.In this work,aπ-conjugated polymer poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione)](PBDB-T)is selected to form a polymer composite hole transport layer(HTL)with Spiro-OMeTAD.The sulfur atom of the thiophene unit and the carbonyl group of the polymer interact with the undercoordinated Pb2+at the perovskite surface,which stabilizes the perovskite/HTL interface and passivates the interfacial defects.The incorporation of the polymer also increases the glass transition temperature and the moisture resistance of Spiro-OMeTAD.As a result,we obtain ST-PSCs with a champion efficiency of 13.71%and an average visible light transmittance of 36.04%.Therefore,a high light utilization efficiency of 4.94%can be obtained.Moreover,the encapsulated device can maintain 84%of the initial efficiency after 751 h under continuous one-sun illumination(at 30%relative humidity)at the open circuit and the unencapsulated device can maintain 80%of the initial efficiency after maximum power tracking for more than 1250 h under continuous one-sun illumination.

关键词： semi-transparent solar cells π-conjugated polymer composite hole transport layer building integrated photovoltaics

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Enhancing Strength-Ductility Synergy of CoCrNi-Based Medium-Entropy Alloy Through Coherent L1_(2)Nanoprecipitates and Grain Boundary Precipitates

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 78-88页

作者： Leilei Li kaikai Song Qingwei Gao Changshan Zhou Xiaoming liu Yaocen Wang Xiaojun Bai Chongde Cao School of Physical Science and Technology Northwestern Polytechnical UniversityXi’an710016China Weihai Research Institute of Industrial Technology Shandong UniversityWeihai264209China Research and Development Institute of Northwestern Polytechnical University in ShenzhenShenzhen518057China

The L1_(2)-strengthened Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3)medium-entropy alloy(MEA)with precipitations of grain boundaries has been developed through selective laser melting(SLM)followed by cold rolling and annealing,exhibiting excellent strength-ductility synergy.The as-printed alloy exhibits low yield strength(YS)of~384 MPa,ultimate tensile strength(UTS)of~453 MPa,and uniform elongation(UE)of 1.5%due to the existence of the SLM-induced defects.After cold rolling and annealing,the YS,UTS,and UE are significantly increased to~739 MPa,~1230 MPa,and~47%,respectively.This enhancement primarily originates from the refined grain structure induced by cold rolling and annealing.The presence of coherent sphericalγ'precipitates(L1_(2)phases)and Al/Ti-rich precipitates at the grain boundaries,coupled with increased lattice defects such as dislocations,stacking faults,and ultrafine deformation twins,further contribute to the property’s improvement.Our study highlights the potential of SLM in producing high-strength and ductile MEA with coherent L1_(2)nanoprecipitates,which can be further optimized through subsequent rolling and annealing processes.These findings offer valuable insights for the development of high-performance alloys for future engineering applications.

关键词： Medium-entropy alloy Selective laser melting Precipitation Strength Ductility

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Progress toward understanding the fullerene-related chemical interactions in perovskite solar cells

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Nano Research 2022年第8期15卷 7139-7153页

作者： kaikai liu Chengbo Tian Yuming Liang Yujie Luo Liqiang Xie Zhanhua Wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China

Fullerene materials have been widely used to fabricate efficient and stable perovskite solar cells(PSCs)due to their excellent electron transport ability,defect passivation effect,and beyond.Recent studies have shown that fullerene-related chemical interaction has played a crucial role in determining device performance.However,the corresponding fullerene-related chemical interactions are yet well understood.Herein,a comprehensive review of fullerene materials in regulating carrier transport,passivating the surface and grain boundary defects,and enhancing device stability is provided.Specifically,the influence of the fullerene-related chemical interactions,including fullerene-perovskite,fullerene-inorganic electron transport layer(IETL),and fullerene-fullerene,on the device performance is well discussed.Finally,we outline some perspectives for further design and application of fullerene materials to enhance the performance and commercial application of PSCs.

关键词： perovskite solar cells functional fullerenes chemical interactions device performance

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Preparation of Perovskite Solar Cells in the Air:Degradation Mechanism and Prospects on Large-Area Fabrication

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Chinese Journal of Chemistry 2023年第5期41卷 599-617页

作者： Shuaishuai Guo kaikai liu Li Rao Xiaotian Hu Yiwang Chen School of Physics and Materials Nanchang University999 Xuefu AvenueNanchangJiangxi 330031China College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry Nanchang University999 Xuefu Avenue NanchangJiangxi330031China Peking University Yangtze Delta Institute of Optoelectronics NantongJiangsu 226010China National Engineering Research Centerfor Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministryof Education Jiangxi Normal University99 Ziyang VenueNanchangJiangxi 330022China

The preparation of perovskite solar cells(PsCs)in the air environment has attracted the attention of numerous experimenters due to its low preparation cost and the possibility of commercialization.Although the power conversion efficiency(PCE)of PSCs has increased rapidly and exceeded 25%,which is comparable to commercial polysilicon solar cells,most certified or reported high-efficiency perovskite solar cells are still confined to glove boxes or relatively small active areas in the air environment due to moisture,oxygen,high temperature,and ultraviolet(UV)factors.In this review.

关键词： Perovskite solar cells Degradation mechanism Fabrication in the air Stability strategy Large-area fabrication Thin films Photooxidation

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Multicolor biomass based carbon nanodots for bacterial imaging

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Chinese Chemical Letters 2022年第2期33卷 798-802页

作者： Wenbo Zhao Yong Wang kaikai liu Rui Zhou Chongxin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

Biomass-based carbon nanodots(CNDs) are becoming promising fluorescent materials due to their superior optical properties and excellent biocompatibility. However, most fluorescent CNDs are prepared under high temperatures with artificial chemicals as precursors. In this work, multicolor biomass-based CNDs have been prepared by employing natural biomass as precursors through an ultrasonic-assisted method at room temperature. The multicolor biomass-based CNDs can be prepared within 10 min, and cavitation produced by ultrasound in solution contributes to the polymerization of biomolecules into nanodots. The emission of the CNDs covers from blue to red region, with emission peaks centered at 410 nm, 520 nm and 670 nm, and the corresponding photoluminescence quantum yields of the CNDs are 11%, 12% and28%, respectively. Furthermore, bacterial imaging by using the biomass-based CNDs as fluorescent imaging agent has been demonstrated. This work provides a convenient ultrasonic-assisted way for fabrication multicolor and eco-friendly biomass CNDs, demonstrating their application in bacterial imaging.

关键词： Carbon nanodots Biomass Fluorescence Ultrasonic methods Bacterial imaging

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Efficient Semi‑Transparent Wide‑Bandgap Perovskite Solar Cells Enabled by Pure‑Chloride 2D‑Perovskite Passivation

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Nano-Micro Letters 2023年第8期15卷 35-48页

作者： liu Yang Yongbin Jin Zheng Fang Jinyan Zhang Ziang Nan Lingfang Zheng Huihu Zhuang Qinghua Zeng kaikai liu Bingru Deng Huiping Feng Yujie Luo Chengbo Tian Changcai Cui Liqiang Xie Xipeng Xu Zhanhua Wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021People’s Republic of China MOE Engineering Research Center for Brittle Materials Machining Institute of Manufacturing EngineeringCollege of Mechanical Engineering and AutomationHuaqiao UniversityXiamen 361021People’s Republic of China Gold Stone(Fujian)Energy Company Limited Quanzhou 362005People’s Republic of China Collaborative Innovation Center of Chemistry for Energy Materials Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005People’s Republic of China

Wide-bandgap(WBG)perovskite solar cells suffer from severe non-radiative recombination and exhibit relatively large opencircuit voltage(V_(OC))deficits,limiting their photovoltaic performance.Here,we address these issues by in-situ forming a well-defined 2D perovskite(PMA)_(2)PbCl_(4)(phenmethylammonium is referred to as PMA)passivation layer on top of the WBG active layer.The 2D layer with highly pure dimensionality and halide components is realized by intentionally tailoring the side-chain substituent at the aryl ring of the post-treatment reagent.First-principle calculation and single-crystal X-ray diffraction results reveal that weak intermolecular interactions between bulky PMA cations and relatively low cation-halide hydrogen bonding strength are crucial in forming the well-defined 2D phase.The(PMA)_(2)PbCl_(4)forms improved type-I energy level alignment with the WBG perovskite,reducing the electron recombination at the perovskite/hole-transport-layer interface.Applying this strategy in fabricating semi-transparent WBG perovskite solar cells(indium tin oxide as the back electrode),the V_(OC)deficits can be reduced to 0.49 V,comparable with the reported state-of-the-art WBG perovskite solar cells using metal electrodes.Consequently,we obtain hysteresis-free 18.60%-efficient WBG perovskite solar cells with a high V_(OC)of 1.23 V.

关键词： Wide-bandgap perovskite solar cells Transparent back electrodes Defect passivation Bulky cations

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Monolithic bilayered In_(2)O_(3) as an efficient interfacial material for high-performance perovskite solar cells

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Interdisciplinary Materials 2022年第4期1卷 526-536页

作者： Wanjia Tian Peiquan Song Yaping Zhao Lina Shen kaikai liu Lingfang Zheng Yujie Luo Chengbo Tian Liqiang Xie Zhanhua Wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamenPeople's Republic of China

Carrier recombination at the buried SnO_(2)/perovskite interface limits the efficiency and stability of n-i-p-structured perovskite solar cells(PSCs).Herein,we report an In_(2)O_(3)interfacial layer with the distinctive structure of the monolithic compact/nanostructured bilayer.The partial hydrolysis nature of the In^(3+)ion enables the formation of nanorods on top of the compact In_(2)O_(3)layer when spin-coating the In(NO_(3))_(3) aqueous solution.This novel interfacial layer reduces the pinholes of the SnO_(2)film and increases the contact area between the perovskite and electron transport material.Therefore,PSCs with the incorporation of the interfacial layer demonstrate enhanced electron extraction and suppressed carrier recombination.Consequently,the champion device achieves a power conversion efficiency of 23.87%with a high fill factor of 82.14%.The optimized device also shows robust operational stability,retaining over 80%of the initial power conversion efficiency after working at the maximum power point for over 500 h under continuous one-sun illumination.

关键词： charge transfer indium oxide interfacial layer perovskite solar cells

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Sputtering under Mild Heating Enables High-Quality ITO for Efficient Semi-Transparent Perovskite Solar Cells

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Journal of Renewable Materials 2022年第10期10卷 2509-2518页

作者： Yongbin Jin Zheng Fang liu Yang kaikai liu Mingliang Li Yaping Zhao Yujie Luo Huiping Feng Bingru Deng Chengbo Tian Changcai Cui Liqiang Xie Xipeng Xu Zhanhua Wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen361021China MOE Engineering Research Center for Brittle Materials Machining Huaqiao UniversityXiamen361021China

Semi-transparent perovskite solar cells(ST-PSCs)are promising in building-integrated photovoltaics(BIPVs)and tandem solar cells(TSCs).One of the keys to fabricate high-performance ST-PSCs is depositing efficient transparent electrodes.Indium tin oxide(ITO)is an excellent transparent conductive oxide with good light transmittance and high conductivity.However,the high sheet resistance of ITO sputtered at room temperature leads to the low fill factor(FF)and poor power conversion efficiency(PCE)of the ST-PSCs.Here,we study the effect of the sputtering temperature on the properties of ITO and the performance of ST-PSCs.We find that when the sputtering temperature increases from the room temperature to 70℃,the crystallinity of the sputtered ITO gradually improves.Therefore,the sheet resistance decreases and the corresponding device performance improves.However,once the sputtering temperature further increases over 70℃,the underlying hole transport layer will be damaged,leading to poor device performance.Therefore,the optimized mild heating temperature of 70℃is applied and we obtain ST-PSCs with a champion PCE of 15.21%.We believe this mild heating assisted sputtering method is applicable in fabricating BIPVs and TSCs.

关键词： Indium tin oxide sputtering temperatures semi-transparent perovskite solar cells

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Pressure-induced photoluminescence enhancement and ambient retention in confined carbon dots

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Nano Research 2022年第3期15卷 2545-2551页

作者： Qing Lou Xigui Yang kaikai liu Zhongzheng Ding Jinxu Qin Yizhe Li Chaofan Lv Yuan Shang Yuewen Zhang Zhuangfei Zhang Jinhao Zang Lin Dong Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China Supercomputer Center Zhengzhou UniversityZhengzhou 450001China

Piezochromic luminescent materials have shown great potential in advanced optoelectronic applications.However,most of luminescent materials usually undergo emission quenching under external stimuli.Herein,we demonstrate for the first time that the photoluminescence of carbon dots(CDs)confined within sodium hydroxide can be enhanced when high pressure is applied.They exhibit a 1.6-fold fluorescence enhancement compared with pristine CDs.Importantly,the enhanced fluorescence intensity can be retained after the release of pressure to ambient conditions.A combination of experimental analysis and theoretical simulations indicates that such an enhanced emission is mainly attributed to the strong conﬁnement resulting from the sodium hydroxide matrix,which can separate the CDs spatially and restrict the nonradiative pathway.These results provide a rational strategy for manipulating the optical properties of CDs with enhanced and retainable photoluminescence(PL)performance,thus opening up a venue for designing luminescent CDs-based materials.

关键词： carbon nanodots high pressure piezochromic fluorescence confinement effect emission enhancement

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基于IPSO的舰载机出动离场规划研究

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系统工程与电子技术 2024年第4期46卷 1337-1345页

作者：刘玉杰崔凯凯韩维李樾海军航空大学航空基础学院山东烟台264001 海军招收飞行学员工作办公室北京100071 中国人民解放军92942部队北京100161 中国人民解放军92728部队上海200436

针对舰载机机群出动离场效率问题,提出了一种改进的粒子群优化(improved particle swarm optimization, IPSO)算法。首先,基于舰载机的出动离场流程及约束建立了舰载机出动离场数学模型,并根据出动离场问题特点设计了一种连续编码形式... 详细信息

针对舰载机机群出动离场效率问题,提出了一种改进的粒子群优化(improved particle swarm optimization, IPSO)算法。首先,基于舰载机的出动离场流程及约束建立了舰载机出动离场数学模型,并根据出动离场问题特点设计了一种连续编码形式以表示出动规划方案。然后,通过在参数自适应粒子群优化算法的基础上引入基于莱维飞行扰动的模拟退火机制,提出了将IPSO用于对出动离场规划问题进行求解。最后,分别针对8、10、12机的出动离场规划场景进行了仿真验证。仿真结果表明,所提算法较已有的优化算法而言具有更好的寻优能力。

关键词：舰载机出动离场粒子群优化莱维飞行模拟退火

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