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Optical bandgap energy of CH3NH3PbI3 perovskite studied by photoconductivity and reflectance spectroscopy

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Science China(Technological Sciences) 2018年第6期61卷 886-892页

作者： HUANG Wei LIU Yu YUE ShiZhong ZHU LaiPan JIN Peng WU Qing ZHANG Yang QU ShengChun wang zhijie CHEN YongHai Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beefing 100049 China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 China

Organic-inorganic hybrid perovskite materials have been receiving considerable attention due to their promising applications in many optoelectronic fields. However, the optical bandgap of CH3NH3PbI3 perovskite is still disputed. In order to comprehend the intrinsic characteristics of these materials, we study the near-band-edge optical responses of the solution-processed CH3NH3PbI3 perovskite crystals by photoconductivity and reflectance spectroscopy at room temperature. All these spectra of the CH3NH3PbI3 polycrystals show only one significant absorption edge at 1.58 eV. However, we observe an extra absorption edge at 1.47 eV in CH3NH3PbI3 single crystal. We establish a simple kinetic model of charge annihilation processes to explain why the low-energy structure of the photoconductivity and diffuse reflectance spectra of CH3NH3PbI3 polyerystals disappear, which provides another possibility for understanding the difference in absorption edge. It is noteworthy that this low-energy absorption edge of CH3NH3PbI3 single crystal has, to the best of our knowledge, seldom been reported on organic-inorganic hybrid perovskites. Therefore, the CH3NH3PbI3 single crystal exhibits a relatively wide absorption which makes it a promising candidate for photoelectric applications.

关键词： CH3NH3PbI3 perovskite photoconductivity spectroscopy reflectance spectroscopy absorption edge

Boron-doped Ⅲ–Ⅴ semiconductors for Si-based optoelectronic devices

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Journal of Semiconductors 2020年第1期41卷 28-38页

作者： Chao Zhao Bo Xu zhijie wang Zhanguo wang JARA-Fundamentals of Future Information Technology(JARA-FIT)and RWTH Aachen University 52074 AachenGermany Peter Grünberg Institute(PGI-9) Forschungszentrum Jülich52425 JülichGermany Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of Sciences and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 101804China

Optoelectronic devices on silicon substrates are essential not only to the optoelectronic integrated circuit but also to low-cost lasers,large-area detectors,and so *** heterogeneous integration of III-V semiconductors on Si has been welldeveloped,the thermal dissipation issue and the complicated fabrication process still hinders the development of these *** monolithic growth of III-V materials on Si has also been demonstrated by applying complicated buffer layers or *** the other hand,the growth of lattice-matched B-doped group-III-V materials is an attractive area of ***,due to the difficulty in growth,the development is still relatively ***,we present a comprehensive review of the recent achievements in this *** summarize and discuss the conditions and mechanisms involved in growing B-doped group-III-V *** unique surface morphology,crystallinity,and optical properties of the epitaxy correlating with their growth conditions are discussed,along with their respective optoelectronic ***,we detail the obstacles and challenges to exploit the potential for such practical applications fully.

关键词： BGaAs Si photodetector epitaxy

Atomic layer deposition-induced integration of N-doped carbon particles on carbon foam for flexible supercapacitor

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Journal of Materiomics 2020年第1期6卷 209-215页

作者： Zhe Zhao Ye Kong Chang Liu Jinrun Liu zhijie wang Gengfeng Zheng Gaoshan Huang Yongfeng Mei Department of Materials Science Fudan UniversityShanghai200433China Laboratory of Advanced Materials Fudan UniversityShanghai200438China

Flexible devices have attracted abundant attention in energy storage *** this paper,we presented a novel approach for fabricating flexible supercapacitor based on metal organic frameworks-derived *** this approach,a uniform zeolitic imidazolate frameworks-8 layer with a high mass loading was deposited on a flexible carbon foam(CF)skeleton efficiently by the induction of a uniform ZnO nanomembrane prepared via an atomic layer deposition technique.A flexible N-doped carbon particle-carbon foam(N-CP-CF)composite with a hierarchically porous structure and a large specific surface area(i.e.,538 m^(2) g^(-1))was obtained in a subsequent pyrolysis *** resultant materials have the excellent electrochemical performance(i.e.,a high specific capacitance of 300 F g^(-1) and a high energy density of 20.8 W h kg^(-1)).The N-CP-CF composite can provide a stable capacitance(i.e.,250 F g^(-1))and an energy density(i.e.,17.36 W h kg^(-1))under large deformation(25% of original thickness).This work could propose a promising strategy in fabrication of flexible electrode with a large potential towards energy storage applications in the future.

关键词： Atomic layer deposition Zeolitic imidazolate framework-8 Flexible device Supercapacitor

Establishment of adult right ventricle failure in ovine using a graded, animal-specific pulmonary artery constriction model

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Animal Models and Experimental Medicine 2020年第2期3卷 182-192页

作者： Michael Nguyen-Truong Wenqiang Liu June Boon Brad Nelson Jeremiah Easley Eric Monnet zhijie wang School of Biomedical Engineering Colorado State UniversityFort CollinsCOUSA Veterinary Teaching Hospital Colorado State UniversityFort CollinsCOUSA Department of Clinical Sciences Colorado State UniversityFort CollinsCOUSA Department of Mechanical Engineering Colorado State UniversityFort CollinsCOUSA

Background: Right ventricle failure(RVF) is associated with serious cardiac and pulmonary diseases that contribute significantly to the morbidity and mortality of patients. Currently, the mechanisms of RVF are not fully understood and it is partly due to the lack of large animal models in adult RVF. In this study, we aim to establish a model of RVF in adult ovine and examine the structure and function relations in the ***: RV pressure overload was induced in adult male sheep by revised pulmonary artery constriction(PAC). Briefly, an adjustable hydraulic occluder was placed around the main pulmonary artery trunk. Then, repeated saline injection was performed at weeks 0, 1, and 4, where the amount of saline was determined in an animal-specific manner. Healthy, age-matched male sheep were used as additional controls. Echocardiography was performed bi-weekly and on week 11 post-PAC, hemodynamic and biological measurements were ***: This PAC methodology resulted in a marked increase in RV systolic pressure and decreases in stroke volume and tricuspid annular plane systolic excursion, indicating signs of RVF. Significant increases in RV chamber size, wall thickness, and Fulton's index were observed. Cardiomyocyte hypertrophy and collagen accumulation(particularly type III collagen) were evident, and these structural changes were correlated with RV ***: In summary, the animal-specific, repeated PAC provided a robust approach to induce adult RVF, and this ovine model will offer a useful tool to study the progression and treatment of adult RVF that is translatable to human diseases.

关键词： animal models fibrosis pulmonary artery banding pulmonary hypertension right heart failure

Therapeutic guidance of tumor mutation burden on immune checkpoint inhibitors in advanced non-small cell lung cancer:a systematic review and comprehensive meta-analysis

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Journal of the National Cancer Center 2022年第1期2卷 41-49页

作者： Jie Zhao Yiting Dong Hua Bai Jianchun Duan Guoqiang wang Jiachen Xu Jie wang zhijie wang State Key Laboratory of Molecular Oncology Department of Medical OncologyNational Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijingChina The Medical Department Burning Rock BiotechGuangzhouChina

Background:Tumor mutation burden(TMB)remains a promising but ambiguous predictive biomarker for the efficacy of immune checkpoint inhibitors(ICIs).We investigated the predictive value of TMB in patients with advanced non-small cell lung cancer(NSCLC)treated by ICI-containing therapies under strictly matched clinical ***:PubMed,Embase,Cochrane Central,***,and bioRxiv databases were searched till October 16,*** randomized controlled trials(RCTs)that compared patients with high TMB(TMB-H)and low TMB(TMB-L)and provided hazard ratio(HR)and corresponding 95%confidence interval(CI)in advanced NSCLC patients receiving ICIs were included,and mirror-based meta-analysis was performed(Part1).Bayesian network meta-analysis was conducted to investigate the efficacy of distinct first-line regimens in TMB-H and TMB-L groups(Part2).Public cohorts were used for validation and further exploration(Part3).Results:Twelve RCTs(n=5527)and 5 public cohorts(n=573)were *** Part1,TMB-H patients generally exhibited a more significant progression-free survival(PFS)benefit from ICI-containing therapies compared to TMB-L patients(HR=0.58,95%CI:0.49-0.67,P<0.0001).In Part2,anti-PD-1 plus chemotherapy ranked best for PFS in both TMB-H and TMB-L ***-PD-L1 plus anti-CTLA-4 therapies indicated better PFS and overall survival(OS)benefit than single ICI and chemotherapy in the TMB-H group,but ranked worst in the TMB-L ***,TMB was validated to be an independent predictive biomarker from programmed cell death-ligand 1(PD-L1)expression in Part3,which could further distinguish beneficiaries of ICI-containing therapies with PD-L1<50%.Conclusion:TMB-H could be a predictive biomarker independent of PD-L1 expression to identify beneficiaries of ICI-containing therapy in advanced NSCLC patients.

关键词： Carcinoma Non-small cell lung Tumor mutation burden Immune checkpoint inhibitors Predictive biomarker Meta-analysis

Overcoming EGFR-TKI resistance by targeting the tumor microenvironment

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Chinese Medical Journal Pulmonary and Critical Care Medicine 2024年第3期2卷 151-161页

作者： Jinsong Zhang Natalie Vokes Man Li Jiachen Xu Hua Bai Jie wang zhijie wang Jianjun Zhang State Key Laboratory of Molecular Oncology CAMS Key Laboratory of Translational Research on Lung CancerDepartment of Medical OncologyNational Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeNo.17PanjiayuannanliChaoyang DistrictBeijing 100021China Department of Thoracic/Head and Neck Medical Oncology Department of Genomic MedicineThe Lung Cancer Interception ProgramThe Lung Cancer Genomics ProgramThe University of TexasMD Anderson Cancer CenterHoustonTX 77030USA Shanxi Cancer Hospital(Shanxi Cancer Institute) Cancer Hospital of Chinese Academy of Medical Sciences Shanxi HospitalShanxi Medical University Affiliated HospitalTaiyuanShanxi 030013China

Targeted therapy has ushered in a new era of precision medicine for non-small cell lung cancer(NSCLC).Currently,epidermal growth factor receptor(EGFR)-tyrosine kinase inhibitors(TKIs)stand as the recommended first-line therapy for advanced NSCLC harboring sensitive EGFR ***,most patients inevitably confront the challenge of drug *** phenomenon arises not solely from intrinsic alterations within cancer cells but also from the intricate dynamics of the tumor microenvironment and the complex interactions that occur between cancer cells and their immediate *** review consolidates the current knowledge regarding EGFR-TKI resistance mechanisms,with a specific emphasis on unraveling the role played by the tumor *** addition,the review delineates strategic approaches to surmount TKI resistance,thereby enriching the understanding of the interplay between therapeutic agents and the intricate milieu surrounding cancer cells.

关键词： Non-small cell lung cancer Epidermal growth factor receptor Tumor microenvironment Epidermal growth factor receptor-tyrosine kinase inhibitor Drug resistance

Circulating cell-free DNA for cancer early detection

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The Innovation 2022年第4期3卷 44-60页

作者： Qiang Gao Qiang Zeng zhijie wang Chengcheng Li Yu Xu Peng Cui Xin Zhu Huafei Lu Guoqiang wang Shangli Cai Jie wang Jia Fan Department of Liver Surgery and Transplantation Liver Cancer InstituteZhongshan HospitalKey Laboratory of Carcinogenesis and Cancer Invasion of Ministry of EducationFudan UniversityShanghai 200032China Key Laboratory of Medical Epigenetics and Metabolism Institutes of Biomedical SciencesFudan UniversityShanghai 200032China Health Management Institute The Second Medical Center&National Clinical Research Center for Geriatric DiseasesChinese PLA General HospitalBeijing 100853China State Key Laboratory of Molecular Oncology Department of Medical OncologyNational Cancer Center/Cancer HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100006China Burning Rock Biotech Guangzhou 510320China

Effective screening modalities are currently available for only a small subset of cancers,and they generally have suboptimal performance with complicated ***,there is an urgent need to develop simple,accurate,and non-invasive methods for early detection of *** and epigenetic alterations in plasma circulating cell-free DNA(cfDNA)have shown the potential to revolutionize methods of early detection of cancers and facilitate subsequent diagnosis to improve survival of *** medical interest in cfDNA assays has been inspired by emerging single-and multi-early detection of cancers *** review summarizes current technological and clinical advances,in the hopes of providing insights into the development and applications of cfDNA assays in various cancers and clinical *** key phases of clinical development of biomarkers are highlighted,and the future developments of cfDNA-based liquid biopsies in early detection of cancers are *** is hoped that this study can boost the potential integration of cfDNA-based early detection of cancers into the current clinical workflow.

关键词： alterations diagnosis subsequent

A close step towards industrialized application of solar water splitting

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Journal of Semiconductors 2020年第9期41卷 1-3页

作者： Jun Liu zhijie wang Yong Lei Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Institut für Physik&IMN MacroNano®(ZIK) Technische Universität IlmenauIlmenau 98693Germany

The efficient utilization of solar energy and the decomposition of water into oxygen and hydrogen are the current hot spots in the community of research,with great application *** is an important clean fuel and widely used in the fuel *** is a necessary gas for human *** is of significance for manned space exploration to achieve efficient oxygen acquisition and gas recycling in confined space.

关键词： space. splitting Oxygen

Weakly solvating electrolytes for next-generation lithium batteries:design principles and recent advances

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Energy Materials and Devices

Energy Materials and Devices 2023年第1期1卷 4-19,3页

作者： zhijie wang Biao Zhang Department of Applied Physics&Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHung HomHong Kong 999077China

Lithium(Li)batteries are major players in the power source market of electric vehicles and portable electronic *** are critical to determining the performance of Li *** electrolytes fall behind the ever-growing demands for fast-charging,wide-temperature operation,and safety properties of Li *** the great success of(localized)high-concentration electrolytes,they still suffer from disadvantages,such as low ionic conductivity and high *** solvating electrolytes(WSEs),also known as low-solvating electrolytes,offer another solution to these challenges,and they have attracted intensive research interests in recent *** contribution reviews the working mechanisms,design principles,and recent advances in the development of WSEs.A summary and perspective regarding future research directions in this field is also *** insights will benefit academic and industrial communities in the design of safe and high-performance next-generation Li batteries.

关键词： weakly solvating electrolytes solvation structure salt design solvent engineering lithium batteries