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Intrinsic thermal stability of inverted perovskite solar cells based on electrochemical deposited PEDOT

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Journal of Energy Chemistry 2023年第8期83卷 445-453,I0011页

作者： Congtan Zhu Jing Gao Tian Chen xueyi guo Ying Yang School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina Laboratory of Photonics and Interfaces Ecole Polytechnique Fédérale de Lausane Lausanne 1015witzeland

Thermal stability of perovskite materials is an issue impairing the long-term operation of inverted perovskite solar cells(PSCs). Herein, the thermal attenuation mechanism of the MAPb I3films that deposited on two different hole transport layers(HTL), poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS) and poly(3,4-ethylenedioxythiophene)(PEDOT), is comprehensively studied by applying a heat treatment at 85℃. The thermal stress causes the mutual ions migration of I, Pb and Ag through the device, which leads to the thermal decomposition of perovskite to form Pb I2. Interestingly, we find that I ions tend to migrate more towards electron transport layer(ETL) during heating, which is different with the observation of I ions migration towards HTL when bias pressure is applied. Moreover, the use of electrochemical deposited PEDOT as HTL significantly decreases the defect density of MAPb I3films as compared to PEDOT:PSS supported one. The electrochemical deposition PEDOT has good carrier mobility and low acidity, which avoids the drawbacks of aqueous PEDOT:PSS. Accordingly, the inverted PSCs based on PEDOT show superior durability than that with PEDOT:PSS. Our results reveal detailed degradation routes of a new kind of inverted PSCs which can contribute to the understanding of the failure of thermal-aged inverted PSCs.

关键词： Inverted perovskite solarcells CH_(3)NH_(3)Pbl_(3) Thermal stability Electrochemical deposition PEDOT

Facile synthesis of spinel LiNi_(0.5)Mn_(1.5)O_(4) as 5.0 V-class high-voltage cathode materials for Li-ion batteries

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Chinese Journal of Chemical Engineering 2021年第11期34卷 247-254页

作者： xueyi guo Chenlin Yang Jinxiu Chen Qinghua Tian Hongmei Zhang guoyong Huang School of Metallurgy and Environment Central South UniversityChangsha 410083China College of New Energy and Materials China University of Petroleum-BeijingBeijing 102249China State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum-BeijingBeijing 102249China State Key Laboratory of Advanced Chemical Poer Sources Guizhou Meiling Power Sources Co.Ltd.Zunyi 563003China

LiNi_(0.5)Mn_(1.5)O_(4) and LiMn_(2)O_(4) with novel spinel morphology were synthesized by a hydrothermal and postcalcination *** synthesized LiMn_(2)O_(4) particles(5–10 lm)are uniform hexahedron,while the LiNi_(0.5)Mn_(1.5)O_(4) has spindle-like morphology with the long axis 10–15 lm,short axis 5–8 *** LiMn_(2)O_(4) and LiNi_(0.5)Mn_(1.5)O_(4) show high capacity when used as cathode materials for Li-ion *** the voltage range of 2.5–5.5 V at room temperature,the LiNi_(0.5)Mn_(1.5)O_(4) has a high discharge capacity of 135.04 mA·h·g^(-1) at 20 mAg^(-1),which is close to 147 mA·h·g^(-1)(theoretical capacity of LiNi_(0.5)Mn_(1.5)O_(4)).The discharge capacity of LiMn_(2)O_(4) is 131.08 mA·h·g^(-1) at 20 mAg^(-1).Moreover,the LiNi_(0.5)Mn_(1.5)O_(4) shows a higher capacity retention(76%)compared to that of LiMn_(2)O_(4)(61%)after 50 *** morphology and structure of LiMn_(2)O_(4) and LiNi_(0.5)Mn_(1.5)O_(4) are well kept even after cycling as demonstrated by SEM and XRD on cycled LiMn_(2)O_(4) and LiNi_(0.5)Mn_(1.5)O_(4) electrodes.

关键词： LiMn_(2)O_(4) LiNi_(0.5)Mn_(1.5)O_(4) Novel morphology Li-ion battery Electrochemistry Preparation Nanomaterials

Revealing the stability origins of 596 days-humidity-stable semitransparentperovskite solar cells

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Journal of Energy Chemistry 2024年第7期94卷 208-216页

作者： Tian Chen Ying Yang Congtan Zhu Weihuang Lin Qilin Dai xueyi guo School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina Department of Chemistry Physics and Atmospheric SciencesJackson State UniversityJacksonMS 39217USA

Hybrid organic-inorganic perovskites(HOIPs)hold promise in the field of optoelectronics due to their excellent photoelectric conversion ***,the ion migration and hygroscopicity of these perovskite solar cells need to be ***,we presented semitransparent perovskite solar cells(ST-PSCs)using hole transport layer(HTL)combined with polyaniline(PANI)to stabilize HTL/perovskite interface,achieving a humidity durability(RH,50%-90%)for 596 days(14304 h)without ***,the decrease in hydrolysis products(LiF)showed the interaction between PANI with the addi-tives in HTL dramatically inhibited the water uptake and corrosion on MAPbI_(3),*** PANI modified samples had a higher I/Pb ratio and lower trap state density,which indicated the passivation effect of PANI on the uncoordinated Pb^(2+)and iodine ***,PANI successfully stabilized the interface and perovskite by inhibiting the formation of Pb^(0) and Au migration as long period *** work presented an interfacial design to develop HOiP in air with high humidity stability.

关键词： HTL/perovskite interface Polyaniline-passivation Humidity-degradation mechanism lon migration

POLYMORPH CONTROL OF ANTIMONY WHITE(Sb_2O_3)PREPARED BY HYDROMETALLURGY METHOD

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中国有色金属学会会刊:英文版 1997年第4期7卷 119-123页

作者： Zhang Duomo Xiao Songwen Cho Tongrae Liu Zhihong Ge Rongde Chen Huiguang guo xueyi Department of Nonferrous Metallurgy Central South University of TechnologyChangsha 410083 College of Engineering Chung Nam National UniversitySouth Korea

The effects of reaction solvent, the properties of Sb 4O 5Cl 2 material and the ligand additives on the reaction rate and polymorph of antimony white(Sb 2O 3) in the reaction of Sb 4O 5Cl 2 transforming into Sb 2O 3 have been investigated by XRD and IR method. It is revealed that the reaction solvent and the properties of Sb 4O 5Cl 2 are the key factors affecting the reaction rate. The polymorph of antimony trioxides is determined by the reaction mechanism, i.e. the coordination state of the antimony activated complex. Adding a little ligand such as EDTA is the most economical and effective method of synthesizing cubic antimony white(Sb 2O 3)in hydrometallurgical transformation process.

关键词： antimony white polymorph antimony activated complex structure selecting catalyst

Li_(3+x)V_2(PO_4)_3的合成及电化学性能研究

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稀有金属材料与工程 2009年第7期38卷 1184-1187页

作者：刘民忠郭学益中南大学湖南长沙410083

通过碳热还原法合成了化学计量比的Li3V2(PO4)3和富锂的锂离子电池正极材料Li3+xV2(PO4)3(x=0.02,0.04,0.05,0.06)。利用XRD、SEM和电化学测试对Li3+xV2(PO4)3进行研究表明:所合成的试样均为单斜晶系结构,无杂相存在;SEM测试发现,掺锂... 详细信息

通过碳热还原法合成了化学计量比的Li3V2(PO4)3和富锂的锂离子电池正极材料Li3+xV2(PO4)3(x=0.02,0.04,0.05,0.06)。利用XRD、SEM和电化学测试对Li3+xV2(PO4)3进行研究表明:所合成的试样均为单斜晶系结构,无杂相存在;SEM测试发现,掺锂可以明显改善Li3V2(PO4)3一次颗粒表面的结构和形貌;电化学性能测试表明,随着掺锂量的提高,试样的循环性能变好。通过研究发现,Li3.04V2(PO4)3具有较高的初始容量和良好的循环性能。

关键词：锂离子电池 Li3V2(PO4)3 掺杂碳热还原

Modulation of energy spectrum and control of coherent microwave transmission at single-photon level by longitudinal field in a superconducting quantum circuit

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Chinese Physics B 2018年第7期27卷 339-344页

作者： xueyi guo Hui Deng Hekang Li Pengtao Song Zhan Wang Luhong Su Jie Li Yirong Jin Dongning Zheng Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

We study the effect of longitudinally applied field modulation on a two-level system using superconducting quantum circuits. The presence of the modulation results in additional transitions and changes the magnitude of the resonance peak in the energy spectrum of the qubit. In particular, when the amplitude ,λz and the frequency COl of the modulation field meet certain conditions, the resonance peak of the qubit disappears. Using this effect, we further demonstrate that the longitudinal field modulation of the Xmon qubit coupled to a one-dimensional transmission line could be used to dynamically control the transmission of single-photon level coherent resonance microwave.

关键词： longitudinal field modulation (LFM) superconducting quantum circuit microwave photonics

Building a Harmonious and Prosperous Tibet- Interview with Yang Chuantang, Secretary of the CPC Tibet Autonomous Region Committee

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China Today 2005年第9期54卷 30-31页

作者： By GONG XIXIANG, XI JUAN & guo xueyi

Interview with Yang Chuantang, Secretary of the CPC Tibet Autonomous Region Committee.

关键词：西藏经济增长产业结构 GDP 投资环境市场经济

Fabrication of Josephson parameter amplifier and its application in squeezing vacuum fluctuations

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Chinese Physics B 2021年第12期30卷 640-647页

作者： Pengtao Song xueyi guo Kai Xu Xiaohui Song Zhan Wang Zhongcheng Xiang Hekang Li Luhong Su Yirong Jin Dongning Zheng Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

Josephson parameter amplifier(JPA)is a microwave signal amplifier device with near-quantum-limit-noise *** has important applications in scientific research fields such as quantum computing and dark matter *** work reports the fabrication and characterization of broadband JPA devices and their applications in multi-qubit readout and squeezing of vacuum *** use a process in which transmission lines and electrodes are made of niobium thin film and aluminum Josephson junctions are made by Dolan bridge *** believe this process is more convenient than the process we used *** whole production process adopts electron beam lithography technology to ensure high structural *** test result shows that the gain value of the manufactured JPA can exceed 15 dB,and the amplification bandwidth is about 400 *** noise temperature is about 400 mK at the working frequency of 6.2 *** devices have been successfully used in experiments involving superconducting multi-qubit quantum ***,the device is applied to squeeze vacuum fluctuations and a squeezing level of 1.635 dB is achieved.

关键词： Josephson parameter amplifier squeezed state quantum computing

Observation of the exceptional point in superconducting qubit with dissipation controlled by parametric modulation

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Chinese Physics B 2021年第10期30卷 66-72页

作者： Zhan Wang Zhongcheng Xiang Tong Liu Xiaohui Song Pengtao Song xueyi guo Luhong Su He Zhang Yanjing Du Dongning Zheng Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China China University of Geosciences Beijing 100083China

Open physical systems described by the non-Hermitian Hamiltonian with parity-time-reversal(PT)symmetry show peculiar phenomena,such as the presence of an exceptional point(EP)at which the PT symmetry is broken and two resonant modes of the Hamiltonian become *** the EP,the system could be more sensitive to external perturbations and this may lead to enhanced *** this paper,we present experimental results on the observation of PT symmetry broken transition and the EP using a tunable superconducting *** quantum system of investigation is formed by the two levels of the qubit and the energy loss of the system to the environment is controlled by a method of parametric modulation of the qubit *** method is simple with no requirements for additional elements or qubit device *** believe it can be easily implemented on multi-qubit devices that would be suitable for further exploration of non-Hermitian physics in more complex and diverse systems.

关键词： exceptional point parity-time-reversal(PT)symmetry longitudinal field modulation