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An Unprecedented Efficiency with Approaching 21%Enabled by Additive‑Assisted Layer‑by‑Layer Processing in Organic Solar Cells

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Nano-Micro Letters 2025年第2期17卷 372-375页

作者： Shuai Xu Youdi Zhang Yanna Sun Pei Cheng Zhaoyang Yao Ning Li Long Ye Lijian Zuo Ke Gao key laboratory of Advanced Green functional materials College of ChemistryChangchun Normal UniversityChangchun 130032People’s Republic of China Shandong Provincial key laboratory for Science of Material Creation and Energy Conversion School of Chemistry and Chemical EngineeringShandong UniversityQingdao 266237People’s Republic of China College of Polymer Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China State key laboratory and Institute of Elemento‑Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071People’s Republic of China Institute of Polymer Optoelectronic materials and devices State key laboratory of Luminescent materials and devices South China University of TechnologyGuangzhou 510640People’s Republic of China Tianjin key laboratory of Molecular Optoelectronic Sciences School of Materials Science and EngineeringTianjin UniversityTianjin 300350People’s Republic of China State key laboratory of Silicon materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China

Recently published in Joule,Feng Liu and colleagues from Shanghai Jiaotong University reported a record-breaking 20.8%power conversion efficiency in organic solar cells(OSCs)with an interpenetrating fibril network active layer morphology,featuring a bulk p-in structure and proper vertical segregation achieved through additive-assisted layer-by-layer *** optimized hierarchical gradient fibrillar morphology and optical management synergistically facilitates exciton diffusion,reduces recombination losses,and enhances light capture *** approach not only offers a solution to achieving high-efficiency devices but also demonstrates the potential for commercial applications of OSCs.

关键词： Organic solar cells Additive-assisted layer-by-layer processing Three-dimensional fibril morphology Bulk p-i-n structure Optical management

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Effects of Yttrium Ion on Formation Mechanism of ZrO_2-Y_2O_3 Ceramic Coatings Formed by Plasma Electrolytic Oxidation on Al-12Si Alloy

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Journal of Wuhan University of Technology(materials Science) 2014年第5期29卷 1044-1048页

作者：王萍 LI Jianping GUO Yongchun YANG Zhong WANG Jianli shaanxi key laboratory of photoelectric functional materials and devices Xi'an Technological University

ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation （PEO） on ZAlSil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD.： The results show that adding an appropriate amount of yttrium ion can improve the growing rate of ceramic coating at different oxidation stages and decrease arc voltage. The thickness of ZrO2-Y2O3 coating is 16 μn thicker than that of ZrO2 coating and the maximum oxidation rate improves by 0.6 μm/min. In addition, the arc voltage decreases from 227 to 172 V. It can be seen that the rate of oxidation firstly increases to some extent and then decreases with the content of yttrium ion increasing. The growth rate reaches the maximum while the content of yttrium ion is 0.05 g-L-1The maximum thickness is 90 μ*** to ZrO2 coating, the micropores of ZrO2-Y2O3 coating are less and the ceramic layer is repeatedly deposited by ZrO2 and Y2O3 ceramic particles. Meanwhile, the binding force between coating and substrate is better and the coating is uniform and compact. The ceramic layer is mainly composed of c-Y0.15Zr0.85O1.93□0.07, m-ZrO2, α-Al2O3, ,γ-Al2O3 and Y2O3. It is indicated that ZrO2 has beert fully stabilized by yttrium ion through the formation of solid solution.

关键词： Al-12Si alloys yttrium ion plasma electrolytic oxidation ZrO2-Y2O3 ceramic coating

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Microstructure and Thermal-protective Property of CPED Coating with ZrO2 Nanoparticles Addition on Al-12Si Alloy

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Journal of Wuhan University of Technology(materials Science) 2019年第5期34卷 1187-1192页

作者： WANG Ping MA Qun LI Bin LI Yaoyao shaanxi key laboratory of photoelectric functional materials and devices School of Materials and Chemical Engineering Xi’an Technological University

A novel thermal-protective coating has been successfully prepared by CPED process on a cast Al-12%Si alloy with the addition of ZrO2 nano-particles in the electrolyte. The microstructures and phase composition of the coatings were analyzed by SEM and XRD, and the heat insulation performance and the thermal shock resistance of the coatings were investigated. With ZrO2 nanoparticles addition, the cathode plasma discharge on the coating surface is more obvious than that without ZrO2 nanoparticles addition, the coating is more uniform and compact, and the thickness of the coating increases. Furthermore, the content of Zr and Y elements increases and the degree of crystallization of the coating is more complete. The formation of the solid solution of yttrium stabilized zirconia is promoted by cathode plasma discharge. In addition, the thermal insulation temperature increases as ZrO2 nano-particles are added to the electrolyte. After 1 000 cycles of thermal shock, there was no cracking in the coating surface layer, which indicated that the CPED coating with ZrO2 nanoparticles addition possessed a good thermal shock resistance.

关键词： Al-12Si piston alloy cathode plasma electrolytic deposition(CPED) ZrO2 nanoparticles heat-shielding performance thermal shock performance

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Structure instability-induced high dielectric properties in[001]-oriented 0.68Pb(Mg_(1/3)Nb_(2/3))O_3–0.33PbTiO_3 crystals

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Chinese Physics B 2019年第5期28卷 318-322页

作者： Xiao-Juan Li Xing Fan Zeng-Zhe Xi Peng Liu Wei Long Pin-Yang Fang Rui-Hua Nan shaanxi key laboratory of photoelectric functional materials and devices School of Materials and Chemical EngineeringXi’an Technological University School of Physics and Information Technology Shaanxi Normal University

The structure evolution and origin of ultrahigh dielectric properties have been investigated in the low temperature range from 300 K to 5 K for [001]-oriented 0.68 Pb(Mg_(1/3)Nb_(2/3))O_3–0.33PbTiO_3(PMN–33 PT) crystal. The experimental results reveal that a short-range ordered monoclinic MAis the dominant phase at ambient temperature. As the temperature drops below 270 K, the MAtransforms into monoclinic MC, and the MCremains stable until 5 K. Although no phase transition occurs from 5 K to 245 K, polar nanoregions(PNRs) display visible changes. The instability of PNRs is suggested as responsible for the low temperature relaxation. The ultrahigh dielectric constant at room temperature is associated with the instability of local structure and phase transition. Our research provides an insight into the design of high-performance ferroelectric materials.

关键词： ferroelectric crystal phase transition local structure dielectric properties

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Effect of phosphorus and heat treatment on microstructure of Al-25%Si alloy

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China Foundry 2017年第1期14卷 10-15页

作者： Bo Dang Zeng-yun Jian Jun-feng Xu Fang-e Chang Man Zhu shaanxi key laboratory of photoelectric functional materials and devices Xi'an Technological UniversityXi'an 710021China

It is known that phosphorus can refine the primary silicon and heat treatment can spheroidize the eutectic silicon. This paper presents an optimal combination of heat treatment processes and P refinement on hypereutectic AI-Si alloy. The optimal P addition amount, and the solution and aging temperatures for AI-25%Si alloy were obtained through the orthogonal experiment, and their modification effects were discussed. The results show that P addition has the greatest modification effect, followed by aging temperature, and the modification effect of solution temperature is the least. The optimized modification parameters are： addition of 0.6% P, solution at 540℃ and aging at 160℃. In addition, the cooling curve, superheating and hardness of the alloy were also analyzed.

关键词： Al-Si alloys combination modifi cation microstructure orthogonal experiment

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Inluence of heat treatment on microstructure and tensile properties of a cast Al-Cu-Si-Mn alloy

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China Foundry 2013年第6期10卷 355-359页

作者： Liu Zhixue Dang Long Cheng Juqiang shaanxi key laboratory of photoelectric functional materials and devices Xi’an Technological University

Solution and aging treatments are important approaches to improve mechanical properties and microstructure of aluminum-base alloys. In this research, a new type high strength AI-Cu-Si-Mn cast alloy was prepared. The effect of different solution and aging treatment temperatures on microstructure and mechanical properties of the AI-Cu-Si-Mn cast alloy were studied by means of microstructure observation and mechanical properties testing. Results showed that after solution treated at different temperatures for 12 h and aged at 175 ℃ for 12 h, with the increase of the solution temperature, both the tensile strength and the elongation of the alloy firstly increase and then decrease, and reach their peak values at 530 ℃. When the solution temperature is below 530 ℃, the microstructure of the alloy consists of a phase, undissolved e phase and T phase; while when it exceeds 530 ℃, the microstructure only consists of cr phase and T phase. After solution treated at 530 ℃ for 12 h and aged at different temperatures for 12 h, both the tensile strength and the elongation of the alloy firstly increase and then decrease with the increasing of temperature, and reach their peak values at 175 ℃. Therefore, the optimal heat treatment process for the alloy in this study is 12 h solution at 530 ℃ and 12 h aging at 175 ℃, and the corresponding tensile strength is 417 MPa, elongation is 4.0%.

关键词： Al-Cu-Si-Mn cast alloy solution treatment aging microstructure property

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White organic light-emitting device with both phosphorescent and fluorescent emissive layers

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Chinese Physics B 2008年第8期17卷 3097-3102页

作者：张丽娟华玉林吴小明王宇印寿根 key laboratory of Display materials and photoelectric devices Ministry of Education key laboratory of photoelectric materials and devices of Tianjin Institute of Material Physics Tianjin University of Technology

This paper reports the fabrication of novel white organic light-emitting device（WOLED） by using a high efficiency blue fluorescent dye N-（4-（（E）-2-（6-（（E）-4-（diphenylamino）styryl）naphthalen-2-yl）vinyl）phenyl）oN- phenylbenzenamine （N-BDAVBi） and a red phosphoresecent dye bis （1-（phenyl） isoquinoline） iridium （III） acetylanetonate （Ir（piq）2（acac））. The configuration of the device was ITO/PVK：TPD/CBP： N-BDAVBi /CBP/ BALq： Ir（piq）2（acac）/BCP/Alq3/LiF：AL. By adjusting the proportion of the dopants （N-BDAVBi, Ir（piq）2（acac）） in the light-emitting layer, white light with Commission Internationale de l＇Eclairage （CIE） coordinates of （0.35, 0.35） and a maximum luminance of 25350cd/m2 were obtained external quantum and current efficiency of 6.78% and between the two light-emitting layers and using BCP at an applied voltage of 22V. The WOLED exhibits maximum 12cd/A respectively. By placing an undoped spacer CBP layer as hole blocking layer, the colour stabilization slightly changed when the driving voltage increased from 6 to 22 V.

关键词： WOLED colour stability N-BDAVBi

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Improving efficiency of organic light-emitting devices by optimizing the LiF interlayer in the hole transport layer

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Chinese Physics B 2011年第10期20卷 426-429页

作者：焦志强吴晓明华玉林董木森苏跃举申利莹印寿根 School of materials Science and Engineering Tianjin University of Technology key laboratory of Display materials and photoelectric devices Ministry of Education Tianjin key laboratory for photoelectric materials and devices

The efficiency of organic light-emitting devices （OLEDs） based on N,N＇-bis（1-naphthyl）-N,N＇-diphenyl-N,1＇- biphenyl-4,4＇-diamine （NPB）（the hole transport layer） and tris（8-hydroxyquinoline） aluminum （Alq3）（both emission and electron transport layers） is improved remarkably by inserting a LiF interlayer into the hole transport layer. This thin LiF interlayer can effectively influence electrical performance and significantly improve the current efficiency of the device. A device with an optimum LiF layer thickness at the optimum position in NPB exhibits a maximum current efficiency of 5.96 cd/A at 215.79 mA/cm2, which is about 86% higher than that of an ordinary device （without a LiF interlayer, 3.2 cd/A）. An explanation can be put forward that LiF in the NPB layer can block holes and balance the recombination of holes and electrons. The results may provide some valuable references for improving OLED current efficiency.

关键词： organic light-emitting devices LiF interlayer efficiency

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Improvement of electron injection of organic light-emitting devices by inserting a thin aluminum layer into cesium carbonate injection layer

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Chinese Physics B 2015年第3期24卷 390-393页

作者：辛利文吴晓明华玉林肖志慧王丽张欣印寿根 School of materials Science and Engineering Tianjin University of Technology key laboratory of Display materials and photoelectric devices of Ministry of Education Tianjin key laboratory of photoelectric materials and devices

We investigate the electron injection effect of inserting a thin aluminum（Al） layer into cesium carbonate（Cs2CO3）injection layer. Two groups of organic light-emitting devices（OLEDs） are fabricated. For the first group of devices based on Alq3, we insert a thin Al layer of different thickness into Cs2CO3 injection layer, and the device＇s maximum current efficiency of 6.5 cd/A is obtained when the thickness of the thin Al layer is 0.4 nm. However, when the thickness of Al layer is 0.8 nm, the capacity of electron injection is the strongest. To validate the universality of this approach, then we fabricate another group of devices based on another blue emitting material. The maximum current efficiency of the device without and with a thin Al layer is 4.51 cd/A and 4.84 cd/A, respectively. Inserting a thin Al layer of an appropriate thickness into Cs2CO3 layer can result in the reduction of electron injection barrier, enhancement of the electron injection, and improvement of the performance of OLEDs. This can be attributed to the mechanism that thermally evaporated Cs2CO3 decomposes into cesium oxides, the thin Al layer reacts with cesium oxides to form Al–O–Cs complex, and the amount of the Al–O–Cs complex can be controlled by adjusting the thickness of the thin Al layer.

关键词： Al–O–Cs complex Cs2CO3 electron injection layer thin Al layer organic light-emitting devices(OLEDs)

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Efficiency of Blue Organic Light-emitting Diodes Enhanced by Employing an Exciton Feedback Layer

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Chinese Physics Letters 2016年第8期33卷 146-150页

作者：于倩倩张旭毕敬萱刘冠廷张棋雯吴晓明华玉林印寿根 key laboratory of Display materials and photoelectric devices of Ministry of Education and Tianjin Key Laboratory of Photoelectric Materials and DevicesSchool of Materials Science and EngineeringTianjin University of Technology

We report that a novel exciton feedback effect is observed by introducing the bis（2-methyl-8-quinolinolato）（4- phenylphenolato）Muminum （BAlq） inserted between the emitting layer （EML） and the electron transporting layer in blue organic light emitting diodes. As an exciton feedback layer （EFL）, the BAlq does not act as a traditional hole blocking effect. The design of this kind of device structure can greatly reduce excitons＇ quenching due to accumulated space charge at the exciton formation interface. Meanwhile, the non-radiative energy transfer from EFL to the EML can also be utilized to enhance the excitons＇ formation, which is confirmed by the test of photolumimescent transient lifetime decay and electroluminescence enhancement of these devices. Accordingly, the optimal device presents the improved performances with the maximum current efficiency of 4.2 cd/A and the luminance of 24600cd/m2, which are about 1.45 times and 1.75 times higher than those of device A （control device） without the EFL, respectively. Simultaneously, the device shows an excellent color stability with a tiny offset of the CIE coordinates （△x = ±0.003, △y = ±0.004） and a relatively lower efficiency roll-off of 26.2% under the driving voltage varying from 3 V to 10 V.

关键词： of in with is as Efficiency of Blue Organic Light-emitting Diodes Enhanced by Employing an Exciton Feedback Layer EFL OLEDs EML NPB by

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