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Precursor engineering enables high-performance all-inorganic CsPbIBr_(2) perovskite solar cells with a record efficiency approaching 13%

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Journal of Energy Chemistry 2024年第3期90卷 16-22,I0003页

作者： Qingyan Chang Yidan An Huaiman Cao Yuzhen Pan Liangyu Zhao Yulong Chen Yi We sai-wing tsang Hin-Lap Yip Licheng Sun Ze Yu State Key Laboratory of Fine Chemicals Dalian University of Technology(DUT)Dalian 116024LiaoningChina Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong KongChina School of Chemistry Dalian University of Technology(DUT)Dalian 116024LiaoningChina Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)Dalian University of Technology(DUT)Dalian 116024LiaoningChina School of Energy and Environment City University of Hong KongKowloon 999077Hong KongChina Center of Artificial Photosynthesis for Solar Fuels and Department of Chemistry School of ScienceWestlake UniversityHangzhou 310024ZhejiangChina Department of Chemistry School of Engineering Sciences in ChemistryBiotechnology and HealthKTH Royal Institute of Technology10044 StockholmSweden

All-inorganic CsPbIBr_(2) perovskite has attracted widespread attention in photovoltaic and other optoelectronic devices because of its superior thermal ***,the deposition of high-quality solutionprocessed CsPbIBr_(2) perovskite films with large thicknesses remains ***,we develop a triple-component precursor(TCP) by employing lead bromide,lead iodide,and cesium bromide,to replace the most commonly used double-component precursor(DCP) consisting of lead bromide and cesium ***,the TCP system significantly increases the solution concentration to 1.3 M,leading to a larger film thickness(~390 nm) and enhanced light *** resultant CsPbIBr_(2) films were evaluated in planar n-i-p structured solar cells,which exhibit a considerably higher optimal photocurrent density of 11.50 mA cm^(-2) in comparison to that of DCP-based devices(10.69 mA cm^(-2)).By adopting an organic surface passivator,the maximum device efficiency using TCP is further boosted to a record efficiency of 12.8% for CsPbIBr_(2) perovskite solar cells.

关键词： All-inorganic perovskite solar cells CsPbIBr_(2) Precursor engineering Solubility High performance

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Record-high near-band-edge optical nonlinearities and two-level model correction of poled polymers by spectroscopic electromodulation and ellipsometry

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Science China Chemistry 2022年第3期65卷 584-593页

作者： Taili Liu Di Zhang Md Rashedul Huqe Wen Wang Juan Antonio Zapien sai-wing tsang Jingdong Luo Shenzhen Research Institute City University of Hong KongShenzhen 518057China Department of Chemistry City University of Hong KongHong Kong SARChina Department of Materials Science and Engineering City University of Hong KongHong Kong SARChina Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongHong Kong SARChina

The determination of nonlinearities near the band edge of organic and polymeric electro-optic(EO)materials is important from the viewpoint of molecular nonlinear optics(NLO)and photonic device *** on transmission-mode Stark effect electromodulation(EM)spectroscopy,we study the electric-field-induced changes in optical absorption and refraction of newly developed EO polymers from the visible to near-infrared(NIR)wavelengths and report record-high near-band-edge complex EO effects from poled thin *** ofΔn andΔk up to 10^(-3) and 10^(-2) are found at an applied electric field of 2.0×10^(5)-3.0×10^(5)V/*** study of linear optical properties of poled films by spectroscopic ellipsometry shows large polinginduced birefringence and a nearly two-fold increase in the extinction coefficients at the extraordinary *** the Kramers-Kronig analysis,we obtained the real and imaginary second-order nonlinear coefficients up to~3,500 and~5,600 pm/V,respectively,which are believed to be the highest NLO coefficients of poled polymers through the resonance *** approach goes beyond the previous works,applicable only to several discrete wavelengths,to a full-spectral analysis with independent verification of slab waveguide *** considering both the electroabsorption and electrorefraction effects,our study overcomes the limitation of the classic qualitative two-level model and provides a quantitative understanding of near-resonance optical nonlinearities of organic EO *** can inspire the exploration of high-speed,absorptive,or phase-shifting light-modulators using EO polymers for on-chip applications.

关键词： poled polymers electroabsorption electro-optic effect second-order nonlinear susceptibilities

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Subtle side chain modification of triphenylamine‐based polymer hole‐transport layer materials produces efficient and stable inverted perovskite solar cells

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Interdisciplinary Materials 2022年第2期1卷 281-293页

作者： Yue-Min Xie Qin Yao Qifan Xue Zixin Zeng Tianqi Niu Yingzhi Zhou Ming-Peng Zhuo sai-wing tsang Hin-Lap Yip Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouP.R.China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates(South China University of Technology) GuangzhouP.R.China Department of Materials Science and Engineering City University of Hong KongKowloonHong KongChina School of Energy and Environmental Science City University of Hong KongKowloonHong KongChina

Polymer hole-transport layers(HTLs)are critical components of inverted perovskite solar cells(IPVSCs).Triphenylamine derivatives PTAA(poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine])and Poly-TPD(poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine])have been widely adopted as hole-transport materials due to their perovskite passivation effects and suitable energy ***,the passivation mechanism(i.e.,the functional group responsible for perovskite passivation)of triphenylamine derivative polymers remains unclear,hindering the development and application of this polymer ***,we develop a novel Poly-TPD derivative,S-Poly-TPD,by replacing the n-butyl functional group of Poly-TPD with an isobutyl group to explore the influence of alkyl groups on HTL performance and top-deposited perovskite *** with Poly-TPD,the increased CH_(3)-terminal unit density and the decreased spatial distance between the-CH-CH_(3) and-CH_(2)-CH_(3) units and the benzene ring in S-Poly-TPD not only enhanced the hole-transport ability but also improved the perovskite passivation effect,revealing for the first time the role of the alkyl groups in perovskite *** a result,the S-Poly-TPD-based IPVSCs demonstrated high power-conversion efficiencies of 15.1% and 21.3% in wide-bandgap[MAPbI_(2)Br(SCN)0.12]and normal-bandgap[(FAPbI_(3))0.92(MAPbBr_(3))0.08]devices,respectively.

关键词： alkyl group inverted perovskite solar cells(IPVSCs) perovskite passivation polymer hole transport layers(HTLs) Poly-TPD,PTAA

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Revealing the crystallization process and realizing uniform 1.8 eV MA-based wide-bandgap mixed-halide perovskites via solution engineering

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Nano Research 2019年第5期12卷 1033-1039页

作者： Yue-Min Xie Chunqing Ma Xiuwen Xu Menglin Li Yuhui Ma Jing Wang Hrisheekesh Thachoth Chandran Chun-Sing Lee sai-wing tsang Department of Materials Science and Engineering City University of Hong KongHong Kong SARChina City University of Hong Kong Shenzhen Research Institute Shenzhen 518057China Center of Super-Diamond and Advanced Films (COSDAF) City University of Hong KongHong Kong SARChina

Wide-bandgap perovskites are recently drawing tremendous attention in the community for high-efficiency all-perovskite tandem solar ***,the formamidinium (FA^+) and methylammonium (MA^+) based wide-bandgap mixed halide perovskites suffered from high density of traps and pin-holes,*** understanding on the crystallization and film formation processes are keys to overcome those challenges but not yet clearly *** this study,an in-situ photoluminescence technique was used to investigate the perovskite crystallization during the thermal annealing *** is found that the crystallization of a mixed halide perovskite with bromide (Br^-) and iodine (I^-) ions following the Ostward ripening crystal ***,it is found that the initial nucleation reaction is quickly completed in the first few seconds,however,leaving the small crystals with inhomogeneous *** different aggregation affinities of such inhomogeneous small crystals provoke the formation of pin-holes during the thermal annealing *** engineering the precursor solution to control the nucleation rate,the chemical composition of the small crystals has become *** pin-hole free high Br-composited wide-bandgap MA0.9Cs0.1Pb(I0.6Br0.4)3 perovskite films with bandgap energy of 1.8 eV have been *** corresponding photovoltaic devices have achieved an encouraging device efficiency of 15.1% with superb photostability.

关键词： in-situ photoluminance wide-bandgap perovskite pin-holes solution engineering

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吩噁嗪基D-p-D型空穴传输材料及其自组装特性研究

吩噁嗪基D-p-D型空穴传输材料及其自组装特性研究

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第三届全国太阳能电池材料与器件大会

作者：蔡宁 sai-wing tsang Alex K.-Y.Jen 广东工业大学轻工化工学院香港城市大学材料科学与工程系

在钙钛矿太阳能电池(PSCs)中,空穴传输材料(HTMs)负责空穴的提取和传输,在PSCs中起着至关重要的作用。常用的商用HTM材料,如聚[双(4-苯基)(2,4,6-三甲苯基)胺(PTAA),仍然存在成本高、聚合物的批次差异以及需要掺杂等问题。而无掺杂小分... 详细信息

在钙钛矿太阳能电池(PSCs)中,空穴传输材料(HTMs)负责空穴的提取和传输,在PSCs中起着至关重要的作用。常用的商用HTM材料,如聚[双(4-苯基)(2,4,6-三甲苯基)胺(PTAA),仍然存在成本高、聚合物的批次差异以及需要掺杂等问题。而无掺杂小分子HTMs具有精确可调的物理化学性质、简单并可放大生产的合成工艺、高批次重复性、低成本等特点,是非常具有应用前景的一类HTMs,特别是在柔性和叠层光伏器件领域中将有希望大放异彩。鉴于此,我们发明了一种新型吩噁嗪基D-p-D型HTM(Figure 1a),其中以烷基溴取代的吩噁嗪为给体(D),以苯并[1,2-b:4,5-b']二噻吩为中间p共轭单元。这一系列吩噁嗪HTM的成本可以控制在19～59美元之间,作为非掺杂HTMs应用于反式PSCs中可以获得最高81.7%的填充因子(FF)[1],最高21.85%的功率转化效率[2]。通过单晶X射线衍射分析可知,这种吩噁嗪基HTM具有独特的链式自组装模式(Figure 1b),进一步借助烷基溴的协同非共价键作用,使得这类新型HTM展现出独特的薄膜吸收、热相转变和薄膜形貌,并进一步获得了良好的电荷提取和传输能力,最终获得了一系列高效稳定的PSCs。

关键词：钙钛矿太阳能电池空穴传输材料吩噁嗪自组装

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Rational Design of Dopant-Free Coplanar D-pi-D Hole-Transporting Materials for High-Performance Perovskite Solar Cells with Fill Factor Exceeding 80%

Rational Design of Dopant-Free Coplanar D-pi-D Hole-Transpor...

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第七届新型太阳能电池材料科学与技术学术研讨会

作者： Yatong Chen Xiuwen Xu Ning Cai sai-wing tsang School of Chemical Engineering and Light Industry Guangdong University of Technology Department of Materials Science and Engineering City University of Hong Kong

In this paper, we report two novel D-pi-D hole-transporting materials(HTM),abbreviated as BDT-PTZ and BDT-POZ,which consists of 4,8-di(hexylthio)-benzo[1,2-b:4,5-b’]dithiophene(BDT) as conjugated linker,and N-(6-bromohexyl) phenothiazine(PTZ)/N-(6-bromohexyl) phenoxazine(POZ) as donor *** above two HTMs were deployed in p-i-n perovskite solar cells as dopant-free hole transporting layers,exhibiting excellent power conversion efficiencies of 18.26% and 19.16% ***,BDT-POZ demonstrated a superior fill factor of 81.7%,which is consistent with its more efficient hole extraction and transport verified via steady state/transient fluorescence spectra and space-charge-limited current *** crystal XRD characterization and analysis implies molecule packing mode and distance of redox center located on adjacent molecules may affect the intrinsic hole extract and transport ability of HTM in perovskite solar cells,which will pave a way for further designing low-cost,high-performance HTM molecules.

关键词： perovskite solar cells dopant-free hole transporting materials hole mobility

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Dopant-Free Coplanar D-π-D Hole-Transporting Materials for Highly Efficient Perovskite Solar Cells with Enhanced Fill Factors

Dopant-Free Coplanar D-π-D Hole-Transporting Materials for ...

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第六届新型太阳能电池材料科学与技术学术研讨会

Recently, a large amount of dopant-free HTMs including small molecules and conjugated polymers have been vigorously explored, however, in most of cases, perovskite solar cells exhibit much lower FFs(mostly less than 75%) , which may derive from inefficient charge extraction or current leakage through shunts and accompanying additional recombination losses. Herein, hole extraction through the dopant-free HTL plays a key role in avoiding charge transport losses and maximizing the FF. Nevertheless, significantly less effort has been devoted to improve the FF of PSCs and to probe inherent structure-property correlations. In this study, we designed and synthesized two novel D-p-D hole-transporting materials(HTM), coded BDT-PTZ and BDT-POZ, which consists of benzo[1,2-b:4,5-b’]dithiophene(BDT) as p conjugated linker, and phenothiazine(PTZ)/phenoxazine(POZ) as donor units. Herein, BDT-PTZ and BDT-POZ were utilized in p-i-n perovskite solar cells as dopant-free hole transporting layers, exhibiting excellent power conversion efficiencies of 18.26% and 19.16%, respectively. Particularly, BDT-POZ demonstrated a superior fill factor of 82%, which is consistent with its more efficient hole extract and hole transport demonstrated by steady state/transient fluorescence spectra and space-charge-limited current(SCLC) technique. Single crystal XRD characterization implies these two HTM molecules present diverse packing tendencies, which may account for various interfacial hole transport ability in perovskite solar cells.

关键词： dopant-free hole-transporting materials perovskite solar cells

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Circadian rhythm dysfunction and psychopathology in the offspring of parents with bipolar disorder:a highrisk study in the Chinese population

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General Psychiatry 2024年第3期37卷 388-400页

作者： Binbin Lei Hongliang Feng Lulu Yang Jing Wang Jie Chen Weidong Song Chao Jiang Kun Zhang Qunfeng Wang Jessie Chi Ching tsang Ngan Yin Chan Yaping Liu Joey W.Y.Chan Jiyang Pan Bin Zhang Tao Li Kathleen Ries Merikangas Jihui Zhang Yun Kwok wing Guangdong Cardiovascular Institute Guangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouGuangdongChina Guangdong Mental Health Center Guangdong Provincial People's Hospital(Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhouGuangdongChina Li Chiu Kong Family Sleep Assessment Unit Department of PsychiatryFaculty of MedicineThe Chinese University of Hong KongHong KongChina Center for Sleep and Circadian Medicine The Affiliated Brain Hospital of Guangzhou Medical UniversityGuangzhouGuangdongChina Department of Psychiatry Faculty of MedicineThe Chinese University of Hong KongNew TerritoriesHong KongChina Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province and the Ministry of Education of China Guangzhou Medical UniversityGuangzhouGuangdongChina Shenzhen Nanshan Center for Chronic Diseases Control(Shenzhen Nanshan Mental Health Center) ShenzhenChina Department of Clinical Psychology Shenzhen Fuyong People's HospitalShenzhenChina Department of Mental Illness Prevention and Treatment Shenzhen Longgang Center for Chronic Diseases ControlShenzhenChina Department of Neurology Zhongnan Hospital of Wuhan UniversityWuhanHubeiChina Sleep Medical Center The First Affiliated Hospital of Jinan UniversityGuangzhouGuangdongChina Department of Psychiatry Nanfang HospitalSouthern Medical UniversityGuangdong-Hong Kong-Macao Greater Bay Area Center for Brain Science and Brain-Inspired IntelligenceGuangzhouGuangdongChina Department of Neurobiology Affiliated Mental Health Center&Hangzhou Seventh People's HospitalZhejiang University School of MedicineHangzhouZhejiangChina Genetic Epidemiology Research Branch Intramural Research ProgramNational Institute of Mental HealthBethesdaMarylandUSA

Background Understanding the evolution of circadian rhythm dysfunction and psychopathology in the high-risk population has important implications for the prevention of bipolar ***,some of the previous studies on the emergence of psychopathologies and circadian dysfunction among high-risk populations were inconsistent and *** To examine the prevalence rates of sleep and circadian dysfunctions,mental disorders and their symptoms in the offspring of parents with(O-BD)and without bipolar disorder(O-control).Methods The study included 191 O-BD and 202 O-control subjects aged 6-21 years from the Greater Bay Area,*** diagnoses and symptoms of sleep/circadian rhythm and mental disorders were assessed by the Diagnostic Interview for Sleep Patterns and Disorders,and the Schedule for Affective Disorders and Schizophrenia for School-Age Children-Present and Lifetime Version,*** estimating equations and shared frailty proportional hazards models of survival analysis were applied to compare the outcomes in the *** Adjusting for age,sex and region of recruitment,there was a significantly higher risk of delayed sleep phase symptoms(9.55%vs 2.58%,adjusted OR:4.04)in O-BD than in O-control.O-BD had a nearly fivefold higher risk of mood disorders(11.70%vs 3.47%,adjusted OR:4.68)and social anxiety(6.28%vs 1.49%,adjusted OR:4.70),a fourfold higher risk of depressive disorders(11.17%vs 3.47%,adjusted OR:3.99)and a threefold higher risk of mood symptoms(20.74%vs 10.40%,adjusted OR:2.59)than *** analysis revealed that O-BD children(aged under 12 years)had a nearly 2-fold higher risk of any mental and behavioural symptoms than O-control,while there was a nearly 4-fold higher risk of delayed sleep phase symptoms,a 7.5-fold higher risk of social anxiety and a 3-fold higher risk of mood symptoms in O-BD adolescents(aged 12 years and over).Conclusions There was an increase in delayed sleep phase symptoms in O-BD

关键词： prevention dysfunction bipolar

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吩噁嗪基D-π-D型空穴传输材料及其自组装行为研究

吩噁嗪基D-π-D型空穴传输材料及其自组装行为研究

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第八届新型太阳能材料科学与技术学术研讨会

作者：蔡宁 sai-wing tsang Alex K.-Y.Jen 广东工业大学香港城市大学

近年来,反式p-i-n结构钙钛矿太阳能电池(PSCs)由于其可忽略的迟滞、制备过程简单、及其与柔性和叠层器件的良好兼容性而受到越来越多的关注。其中,空穴传输材料(HTMs),负责空穴提取和传输,在反式PSCs中起着至关重要的作用。然而,常用的... 详细信息

近年来,反式p-i-n结构钙钛矿太阳能电池(PSCs)由于其可忽略的迟滞、制备过程简单、及其与柔性和叠层器件的良好兼容性而受到越来越多的关注。其中,空穴传输材料(HTMs),负责空穴提取和传输,在反式PSCs中起着至关重要的作用。然而,常用的商用HTM材料,如聚[双(4-苯基)(2,4,6-三甲苯基)胺(PTAA),仍然存在成本高、聚合物的批次差异以及需要掺杂等问题。鉴于此,我们发明了一种新型吩噁嗪基D-π-D型HTM(Figure 1a),其中以烷基溴取代的吩噁嗪为给体(D),以苯并[1,2-b:4,5-b’]二噻吩为中间π共轭单元。这一系列吩噁嗪HTM的成本可以控制在19～59美元之间,作为非掺杂HTMs应用于反式PSCs中可以获得最高81.7%的填充因子(FF)[1],最高21.85%的功率转化效率。通过单晶X射线衍射分析可知,这种吩噁嗪基HTM具有独特的链式自组装模式(Figure 1b),进一步借助烷基溴的协同非共价键作用,使得这类新型HTM展现出独特的薄膜吸收、热相转变和薄膜形貌,并进一步获得了良好的电荷提取和传输能力,最终获得了一系列高效稳定的PSCs。

关键词：钙钛矿太阳能电池空穴传输材料吩噁嗪自组装

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Superior antibody and membrane protein‑specific T‑cell responses to CoronaVac by intradermal versus intramuscular routes in adolescents

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World Journal of Pediatrics 2024年第4期20卷 353-370页

作者： Jaime S.Rosa Duque Samuel M.S.Cheng Carolyn A.Cohen Daniel Leung Xiwei Wang Xiaofeng Mu Yuet Chung Tsun Ming Lau Manni Wang Wenyue Zhang Yanmei Zhang Howard H.W.Wong Leo C.H.tsang Sara Chaothai Tsz Chun Kwan John K.C.Li Karl C.K.Chan Leo L.H.Luk Jenson C.H.Ho wing Yan Li Amos M.T.Lee Jennifer H.Y.Lam Sau Man Chan Wilfred H.S.Wong Issan Y.S.Tam Masashi Mori Sophie A.Valkenburg Malik Peiris Wenwei Tu Yu Lung Lau Department of Paediatrics and Adolescent Medicine The University of Hong KongHong KongChina School of Public Health The University of Hong KongHong KongChina HKU‑Pasteur Research Pole School of Public HealthThe University of Hong KongHong KongChina Research Institute for Bioresources and Biotechnology Ishikawa Prefectural UniversityNonoichiJapan Department of Microbiology and Immunology Peter Doherty Institute for Infectionand ImmunityUniversity of MelbourneMelbourneVICAustralia Center for Immunology and Infection C2i Hong KongChina

Background Optimising the immunogenicity of COVID-19 vaccines to improve their protection against disease is *** dosing by intradermal(ID)administration has been shown to be equally immunogenic as intramuscular(IM)administration for several vaccines,but the immunogenicity of ID inactivated whole severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)at the full dose is *** study(NCT04800133)investigated the superiority of antibody and T-cell responses of full-dose CoronaVac by ID over IM administration in *** Participants aged 11–17 years received two doses of IM or ID vaccine,followed by the 3rd dose 13–42 days *** and cellular immunogenicity outcomes were measured post-dose 2(IM-CC versus ID-CC)and post-dose 3(IMCCC versus ID-CCC).Doses 2 and 3 were administered to 173 and 104 adolescents,*** Spike protein(S)immunoglobulin G(IgG),S-receptor-binding domain(RBD)IgG,S IgG Fcγreceptor IIIa(FcγRIIIa)-binding,SNM[sum of individual(S),nucleocapsid protein(N),and membrane protein(M)peptide pool]-specific interleukin-2(IL-2)+CD4^(+),SNM-specific IL-2^(+)CD8^(+),S-specific IL-2^(+)CD8^(+),N-specific IL-2^(+)CD4^(+),N-specific IL-2^(+)CD8^(+)and M-specific IL-2^(+)CD4^(+)responses fulfilled the superior and non-inferior criteria for ID-CC compared to IM-CC,whereas IgG avidity was *** ID-CCC,S-RBD IgG,surrogate virus neutralisation test,90%plaque reduction neutralisation titre(PRNT90),PRNT50,S IgG avidity,S IgG FcγRIIIa-binding,M-specific IL-2^(+)CD4^(+),interferon-γ+CD8^(+)and IL-2^(+)CD8^(+)responses were superior and non-inferior to *** estimated vaccine efficacies were 49%,52%,66%and 79%for IM-CC,ID-CC,IM-CCC and ID-CCC,*** ID groups reported more local,mild adverse *** This is the first study to demonstrate superior antibody and M-specific T-cell responses by ID inactivated SARSCoV-2 vaccination and serves as the basis for future research to improve the

关键词： CoronaVac Coronavirus disease 2019 Immunity Intradermal Vaccine

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