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Journal of Energy Chemistry 2021年第10期30卷 1-7,I0001页

作者： Yueqing Deng Zhengji Zhou Xin Zhang Lei Cao Wenhui Zhou Dongxing Kou Yafang Qi Shengjie Yuan Zhi Zheng Sixin Wu Key Lab for Special Functional Materials Ministry of EducationNational and Local Joint Engineering Research Center for High-Efficiency Display and Lighting TechnologyAnd School of MaterialsHenan UniversityKaifeng 475004HenanChina Collaborative Innovation Centre of Nano Functional Materials and Applications HenanChina Key Laboratory for Micro-Nano Energy Storage and Conversion Materials of Henan Province College of Advanced Materials and EnergyInstitute of Surface Micro and Nano MaterialsXuchang UniversityXuchang 461000HenanChina

The development of kesterite photovoltaic solar cells has been hindered by large open-circuit voltage(V_(oc))***,Snzn deep point defect and associative defect cluster have been recognized as the main culprit for the Voc ***,manipulating the deep-level donor of Snzn antisite defects is crucial for breaking through the bottleneck of present Cu_(2) ZnSn(S,Se)_(4)(CZTSSe)photovoltaic *** this study,the Snzn deep traps in CZTSSe absorber layer are suppressed by incorporation of *** energy levels and concentration of Snzn defects measured by deep-level transient spectroscopy(DLTS)decrease *** addition,the grain growth of CZTSSe films is also promoted due to Ge implantation,yielding the high quality absorber ***,the efficiency of CZTSSe solar cells increases from 9.15%to 11.48%,largely attributed to the 41 mV Voc increment.

关键词： CZTSSe Defect Absorber layer solar cells V_(oc)

Reductive ionic liquid-mediated crystallization for enhanced photovoltaic performance of Sn-based perovskite solar cells

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Science China Chemistry 2022年第10期65卷 1895-1902页

作者： He Dong Chenxin Ran Wangyue Li Xin Liu Weiyin Gao Yingdong Xia Yonghua Chen Wei Huang Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211816China Key Laboratory for Organic Electronics&Information Displays(KLOEID) and Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China

Tin(Sn)-based perovskite solar cells(PSCs)have recently made inspiring progress,and certified power conversion efficiency(PCE)has reached impressive value of 14.8%.However,it is still challenging to realize efficient and stable 3D Sn-based PSCs due to the fast crystallization and easy Sn^(2+)oxidation of Sn-based ***,we reported the utilization of a reductive ionic liquid,methylamine formate(MAFa),to drive the controlled crystallization process and suppress Sn^(2+)oxidation of FASnI_(3)perovskite *** coordination of C=O and Sn^(2+)and the hydrogen bonding of N-H···I between the MAFa and FASnI_(3)precursors are shown to be responsible for retarding the crystallization of FASnI_(3)during film-forming process,which promotes the oriented growth and reduced defect traps of the ***,the strong reducibility of–CHO groups in Fa−suppresses the oxidation of Sn^(2+)in the *** a result,MAFa-modified 3D PSCs device could reach champion PCE of up to 8.50%,which is enhanced by 26.11%compared to the control device with PCE of 6.74%.Most importantly,the MAFa-modified device shows much improved stability compared to the control device under same conditions without *** work adds key building blocks for further boosting the PCE and stability of Sn-based PSCs.

关键词： 3D Sn-based perovskite solar cells ionic liquid retarded crystallization suppressed Sn^(2+)oxidation

Overcoming the Limitation of Cs_(2)AgBiBr_(6) Double Perovskite solar cells Through Using Mesoporous TiO_(2) Electron Extraction Layer

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Energy & Environmental Materials 2022年第4期5卷 1317-1322页

作者： Dandan Zhao Chao Liang Bingzhe Wang Tanghao Liu Qi Wei Kaiyang Wang Hao Gu Sisi Wang Shiliang Mei Guichuan Xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipa Macao 999078China

Lead-free double perovskite Cs_(2)AgBiBr_(6) has gained increasing attention ***,the power conversion efficiency(PCE)of Cs_(2)AgBiBr_(6) perovskite solar cells(PSCs)is still low compared with their lead-based ***,by using photoluminescence(PL),time-resolved photoluminescence(TRPL),and ultrafast transient absorption(TA)measurements,the unbalance between the electron and hole in diffusion and transfer,which limits the performance of the Cs_(2)AgBiBr_(6) PSCs,was further *** this issue,a strategy of using the mesoporous TiO_(2) electron transport layer(ETL)to construct a bulk heterojunction in Cs_(2)AgBiBr_(6) PSCs was ***,the PCE had improved by over 24%comparing with that only used compact TiO_(2) ***,based on mesoporous TiO_(2),the unencapsulated Cs_(2)AgBiBr_(6) PSCs maintained 90%of their initial performance after approximately 1200 h of storage in a desiccator(humidity~30%).This work gives further understanding of Cs_(2)AgBiBr_(6) perovskite and demonstrates that a proper design of balancing the electron and hole diffusion can improve device performance.

关键词： bulk heterostructure charge carrier dynamics Cs_(2)AgBiBr_(6) lead-free double perovskite solar cells

Residual solvent extraction via chemical displacement for efficient and stable perovskite solar cells

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Journal of Energy Chemistry 2021年第10期30卷 8-14,I0001页

作者： Min Fang Lei Tao Wen Wu Qi Wei Yingdong Xia Ping Li Xueqin Ran Qi Zhong Guichuan Xing Lin Song Peter Müller-Buschbaum Hui Zhang Yonghua Chen Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(Nanjing Tech)Nanjing 211816JiangsuChina Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina Key Laboratory of Advanced Textile Materials&Manufacturing Technology Ministry of EducationZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina Institute of Joint Key Laboratory of the Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipa 999078MacaoChina Lehrstuhl für Funktionelle Materialien Physik DepartmentTechnische Universität München.James-Franck-Str.185748 GarchingGermany Heinz Maier-Leibnitz Zentrum(MLZ) Technische Universität MünchenLichtenbergstr.185748 GarchingGermany

Solvent residue is inevitable to occur in solution processed thin films,but its influence on the thin film quality has not been identified and addressed to *** acetate(MAAc)ionic liquid has recently been realized as an environmentally friendly solvent for solution processed *** specific high viscosity,low vapor pressure and strong association with perovskite precursor of the MAAc solvent is a double-edged sword,which endowed an advantageously ambient air operational and anti-solvent free perovskite deposition,but the MAAc is likely to be retained within the film and bring in detrimental effects on device performance of the corresponding solar ***,we reported a novel route to eliminate the residual solvent via a facial hydrochloric acid(HCl)annealing post-treatment(HAAP).In particular,chemical displacement reaction between the incorporated HCl and residual MAAc can be initiated to form volatile MACl and HAc,efficiently extracting MAAc *** the meanwhile,the stimulated mass transport via downward penetration and upward escape can trigger secondary perovskite growth with enlarged grain size and smoothened surface,leading to reduced defect state and improved interfacial contact intimacy,and also partial chloride ions are able to enter the crystal lattice to stabilize perovskite phase *** a result,a champion efficiency up to20.78%originating from enhanced Voc was achieved,and more than 96%of its initial efficiency can be maintained after 1000 h shelf-storage.

关键词： Perovskite solar cells Solvent residue Methylammonium acetate Post-treatment Chemical displacement

Applications and functions of rare-earth ions in perovskite solar cells

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Chinese Physics B 2022年第3期31卷 36-51页

作者： Limin Cang Zongyao Qian Jinpei Wang Libao Chen Zhigang Wan Ke Yang Hui Zhang Yonghua Chen Research Center Ancai Hi-Tech Co.Ltd.Anyang 455000China Key Laboratory of Flexible Electronics Institute of Advanced MaterialsNanjing Tech UniversityNanjing 211800China

The emerging perovskite solar cells have been recognized as one of the most promising new-generation photovoltaic technologies owing to their potential of high efficiency and low production cost. However, the current perovskite solar cells suffer from some obstacles such as non-radiative charge recombination, mismatched absorption, light induced degradation for the further improvement of the power conversion efficiency and operational stability towards practical application. The rare-earth elements have been recently employed to effectively overcome these drawbacks according to their unique photophysical properties. Herein, the recent progress of the application of rare-earth ions and their functions in perovskite solar cells were systematically reviewed. As it was revealed that the rare-earth ions can be coupled with both charge transport metal oxides and photosensitive perovskites to regulate the thin film formation, and the rare-earth ions are embedded either substitutionally into the crystal lattices to adjust the optoelectronic properties and phase structure, or interstitially at grain boundaries and surface for effective defect passivation. In addition, the reversible oxidation and reduction potential of rare-earth ions can prevent the reduction and oxidation of the targeted materials. Moreover, owing to the presence of numerous energetic transition orbits, the rare-earth elements can convert low-energy infrared photons or high-energy ultraviolet photons into perovskite responsive visible light, to extend spectral response range and avoid high-energy light damage. Therefore, the incorporation of rare-earth elements into the perovskite solar cells have demonstrated promising potentials to simultaneously boost the device efficiency and stability.

关键词： perovskite solar cells rare-earth ions power conversion efficiency

Investigation of shunt solar cells’ currents based on equivalent circuit model

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Science China(Technological Sciences) 2016年第9期59卷 1391-1398页

作者： YI ShiGuang ZHANG WanHui SHEN Hui ZHANG WenJie LUO ZhiRong CHEN Le College of Physical Science and Technology Engineering Guangxi Colleges and Universities Key Laboratory of Complex System Optimization and Large Data Processing Yulin Normal University Yulin 537000 China Institute for solar Energy Systems Sun Yat-sen University Guangzhou 510275 China Guangdong Testing Institute of Product Quality Supervision Foshan 528300 China

In view of the universality of the parallel connection of solar cells and their mismatch problem, in the present paper, we select two shunt solar cells (connected in parallel) as our research object, and use the equivalent one-diode circuit of the solar cell and the analysis of the two-body model. At first, the equations of current and voltage are deduced from the related electrical laws and the circuit diagram of the two solar cells connected in parallel. Then, according to the experimentally measured data of typical single-crystalline silicon solar cells (125 mm×125 mm), we select the appropriate simulation parameters. Following this, by using the photo-generated current, the shunt resistance, and the serial resistance of one of the shunt solar cells and the load resistance as independent variables, in turn, the changing characteristics of each branch current in the two shunt solar cells are numerically discussed and analyzed for these four cases for the first time. At the same time, we provide a simple physical explanation for the modeling results. Our analyses show that these parameters have different impacts on the internal currents of solar cells connected in parallel. These results provide a reference to solve the problem of connecting solar cells and to develop higher efficiency solar cells and systems. Meanwhile, the results will contribute to a better comprehension of the reasons for efficiency loss of solar cells and systems, and deepen the understanding of the electrical of solar cells behavior for high performance photovoltaic applications.

关键词： solar cells mismatch losses internal currents

Impeded degradation of perovskite solar cells via the dual interfacial modification of siloxane

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Science China Chemistry 2022年第11期65卷 2299-2306页

作者： Xiao Zhang Changsu Cao Yang Bai Cheng Zhu Huachao Zai Sai Ma Yihua Chen Zhenhua Cui Congbo Shi Chenyue Wang Chenxiao Zhou Guizhou Yuan Ziyan Gao Jiawang Hong Jie Dou Hao Wang Huanping Zhou Hai Xiao Jun Li Qi Chen Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing100081China Experimental Center of Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Chemistry and Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education Tsinghua UniversityBeijing 100084China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China Shanghai Synchrotron Radiation Facility(SSRF) Zhangjiang LabShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

It is challenging to improve the long-term stability of perovskite solar cells(PSCs) without sacrificing efficiency. The perovskite absorbers degrade from the film surface/interfaces, which follows entangled mechanisms that have not been fully revealed ***, we decouple and elaborate two distinctive pathways regarding film degradation based on ***, a dual interfacial modification strategy has been developed for improving the material’s intrinsic stability, thus leading to the film degrading in a more retardant pathway. The corresponding PSCs achieve a stable power output efficiency of 23.75%.More importantly, the unencapsulated PSCs devices retain over 93% of their initial PCE after the maximum power point(MPP)tracking under the continuous 1-sun illumination and show significantly improved stability after aged under the thermal treatment or stored in ambient atmosphere for over 1500 hours without obvious PCE decay. This work shows the importance of modulating the degradation pathway on stability improvement, and at the same time, proposes a strategy for designing perovskite-based optoelectronics with excellent performance and stability.

关键词： perovskite solar cells stability degradation kinetics

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Perovskite bridging PbS quantum dot/polymer interface enables efficient solar cells

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Nano Research 2022年第7期15卷 6121-6127页

作者： Xing Meng Yifan Chen Fan Yang Jieqi Zhang Guozheng Shi Yannan Zhang Haodong Tang Wei Chen Yang Liu Lin Yuan Shaojuan Li Kai Wang Qi Chen Zeke Liu Wanli Ma Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China State Key Laboratory of Applied Optics Changchun Institute of Optics Fine Mechanics and PhysicsChangchun 130033China i-Lab CAS Center for Excellence in NanoscienceSuzhou Institute of Nano-Tech and Nano-BionicsSuzhou 215123China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China

Conjugated polymers have been explored as promising hole-transporting layer(HTL)in lead sulfide(PbS)quantum dot(QD)solar *** fine regulation of the inorganic/organic interface is pivotal to realize high device *** this work,we propose using CsPbI_(3) QDs as the interfacial layer between PbS QD active layer and organic polymer *** relative soft perovskite can mediate the interface and form favorable energy level alignment,improving charge extraction and reducing interfacial charge *** a result,the photovoltaic performance can be efficiently improved from 10.50%to 12.32%.This work may provide new guidelines to the device structural design of QD optoelectronics by integrating different solutionprocessed semiconductors.

关键词： lead sulfide quantum dot solar cells perovskite energy level alignment

Ultrathin microcrystalline hydrogenated Si/Ge alloyed tandem solar cells towards full solar spectrum conversion

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Frontiers of Chemical Science and Engineering 2020年第6期14卷 997-1005页

作者： Yu Cao Xinyun Zhu Xingyu Tong Jing Zhou Jian Ni Jianjun Zhang Jinbo Pang Key Laboratory of Modem Power System Simulation and Control&Renewable Energy Technology Northeast Electric Power UniversityJilin 132012China School of Electrical Engineering Northeast Electric Power UniversityJilin 132012China School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Key Laboratory of Photo-electronics Thin Film Devices and Technique of Tianjin Institute of Photo-electronic Thin Film Devices and TechnologyCollege of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong Institute for Advanced Interdisciplinary Research(iAIR)University of JinanJinan 250022China

Thin film solar cells have been proved the next generation photovoltaic devices due to their low cost,less material consumption and easy mass *** them,micro-crystalline Si and Ge based thin film solar cells have advantages of high efficiency and ultrathin absorber *** individual junction devices are limited in photoelectric conversion efficiency because of the restricted solar spectrum range for its specific *** this work,w e designed a nd simulated a multi-junction solar cell with its four sub-cells selectively absorbing the full solar spectrum including the ultraviolet,green,red as well as near infrared range,respectively.B y tuning the G e content,the record efficiency of 24.80%has been realized with the typical quadruple junction structure of a-Si:H/a-Si0.9Ge0.1:H/μc-Si:H/μc-Si0.5Ge0.5:*** further reduce the material cost,thickness dependent device performances have been *** can be found that the design of total thickness of 4μm is the optimal device design in balancing the thickness a nd the *** the design of ultrathin quadruple junction device with total thickness of 2μm is the optimized device design regarding cost and long-term stability with a little bit more reduction in *** results indicated that our solar cells combine the advantages of low cost and high *** work may provide a general guidance rule of utilizing the full solar spectrum for developing high efficiency and ultrathin multi-junction solar cells.

关键词： thin films solar cells quadruple junction solar cell amorphous silicon silicon germanium alloy quantum efficiency

One-dimension carbon self-doping g-C3N4 nanotubes： Synthesis and application in dye-sensitized solar cells

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Nano Research 2018年第3期11卷 1322-1330页

作者： Xue Li Kai Pan Yang Qu Guofeng Wang Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Science Heilongjiang University Harbin 150080 China

One-dimensional carbon self-doping g-C3N4 nanotubes （CNT） with abundant communicating pores were synthesized via thermal polymerization of saturated or supersaturated urea inside the framework of a melamine sponge for the first time. A - 16% improvement in photoelectric conversion efficiency （η） is observed for the devices fabricated with a binary hybrid composite of the obtained CNT and TiO2 compared to pure TiO2 device. The result of EIS analysis reveals that the interfacial resistance of the TiO2-dye｜ I3^-/I- electrolyte interface of TiO2-CNT composite cell is much lower than that of pure TiO2 cell. In addition, the TiOa-CNT composite cell exhibits longer electron recombination time, shorter electron transport time, and higher charge collection efficiency than those of pure TiO2 cell. Systematic investigations reveal that the CNT boosts the light harvesting ability of the photovoltaic devices by enhancing not only the visible light absorption but also the charge separation and transfer.

关键词： g-C3N4 nanotube photoelectric conversion solar cells