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Functional polymer passivatingFA_(0.85)PEA_(0.15)SnI_(3) for efficient and stable lead-free perovskite solar cells

Nano Research 2023年第1期16卷 481-488页

作者： Wenzhan Xu Yu Gao Miao He Shuyan Chen Hongyan Fu guodan wei Tsinghua-Berkeley Shenzhen Institute(TBSI) Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518000China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518000China

Due to their excellent advantages such as low toxicity,superior optoelectronic properties,low-temperature fabrication,and costeffectiveness,Sn-based perovskites have become the most promising alternatives for high performance lead-free perovskite solar cells.However,the character of Sn ^(2+)is easily oxidized toSn ^(4+),causing unnecessary p-type self-doping and high leakage current.More seriously,trap-induced non-radiative recombination from rapid crystallization causes into large energy loss with a low open circuit voltage.Therefore,the Sn-based solar cells have efficiency far behind the Pb-based solar cells.Herein,the polymer poly(ethylene glycol)diacrylate(PEGDA)is used to control crystal growth and passivate the defects in FA_(0.85)PEA_(0.15)SnI_(3) thin film.This Sn-perovskite layer shows compact crystal with large grain size and reduced defects.Optimized perovskite thin film is further processed to fabricate the inverted solar cell with device structure of ITO(indium tin oxide)/PEDOT:PSS(Poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate))/FA_(0.85)PEA_(0.15)SnI_(3)/ICBA(indene-C60 bisadduct)/BCP(bathocuproine)/Ag,which shows the power conversion efficiency(PCE)of 11.45%with voltage of 0.82 V.Moreover,corresponding perovskite solar cells exhibit an enhanced stability due to PEGDA induced compressive strain in perovskite.This work could shed light on one of successful attempts to improve Sn-based solar cell efficiency for sustainable energy conversion.

关键词： FA_(0.85)PEA_(0.15)SnI_(3) perovskites solar cells crystal growth modulation stability

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Enhanced Emission of Molybdenum Disulfide by Organic−Inorganic Hybrid Heterojunctions

Precision Chemistry

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Precision Chemistry 2023年第6期1卷 357-362页

作者： Si-wei Zhang Fulong Ma Jinhui Jiang Zaiyu Wang Zijie Qiu Jacky W.Y.Lam guodan wei Zheng Zhao Ben Zhong Tang Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology999077 Hong KongChina School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Guangdong 518172China Tsinghua-Berkeley Shenzhen Institute Institute of Materials ScienceTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Tang−Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology999077 Hong KongChina Center for Aggregation-Induced Emission South China University of TechnologyGuangzhou 510640China

Due to their excellent stability and layer-dependent photoelectronic properties,transition metal dichalcogenides(TMDs)are one of the most extensively studied two-dimensional semiconductor materials in the postgraphene era.However,its low luminescence quantum yield limits its application in displays,lighting,and imaging.Here,a 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile(HATCN)layer was grown on the surface of chemical vapor deposition(CVD)-grown monolayer molybdenum disulfide(MoS_(2))by vacuum evaporation,which increased the photoluminescence intensity of MoS_(2)by 15 times.The enhanced luminescence originates from the charge transfer from the conduction band of MoS_(2)to the lowest unoccupied molecular orbital(LUMO)of HATCN,which suppresses the emission of the negatively charged exciton(trion)while increasing the emission of the neutral exciton.Temperature-dependent fluorescence and Raman spectra demonstrate the feasibility of organic−inorganic hybrid heterojunctions for regulating excitons.This facile and practical organic−inorganic hybrid heterojunction can elevate TMD applications,such as light-emitting diodes.

关键词： TMDs MoS_(2) CVD photoluminescence organic−inorganic hybrid heterojunction

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Organic near-infrared photodetectors with photoconductivityenhanced performance

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Aggregate 2023年第5期4卷 120-127页

作者： Siwei Zhang Zhenlong Li Jingzhou Li Bingzhe Wang Fang Chen Xubiao Li Shunjie Liu Jacky W.Y.Lam Guichuan Xing Jiangyu Li Zheng Zhao Feiyu Kang guodan wei Ben Zhong Tang Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Guangdong-Hong Kong-Macro Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsThe Hong Kong University of Science and TechnologyKowloonHong KongChina Tsinghua-Berkeley Shenzhen Institute Institute of Materials ScienceTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhenChina Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhouChina Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacaoChina Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhenChina Changchun Institute of Applied Chemistry Chinese Academy of SciencesChangchunChina School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenChina Center for Aggregation-Induced Emission South China University of TechnologyGuangzhouChina

Organic near-infrared(NIR)photodetectors with essential applications in medical diagnostics,night vision,remote sensing,and optical communications have attracted intensive research interest.Compared with most conventional inorganic counterparts,organic semiconductors usually have higher absorption coefficients,and their thin active layer could be sufficient to absorb most incident light for effective photogeneration.However,due to the relatively poor charge mobility of organic materials,it remains challenging to inhibit the photogenerated exciton recombination and effectively extract carriers to their respective electrodes.Herein,this challenge was addressed by increasing matrix conductivities of a ternary active layer(D–A–D structure NIR absorber[2TT-oC6B]:poly(N,N′-bis-4-butylphenyl-N,N′-bisphenyl)benzidin[PolyTPD]:[6,6]-phenyl-C61-butyric acid methyl ester[PCBM]=1:1:1)upon in situ incident light illumination,significantly accelerating charge transport through percolated interpenetrating paths.The greatly enhanced photoconductivity under illumination is intrinsically related to the unique donor–acceptor molecular structures of PolyTPD and 2TT-oC6B,whereas stable intermolecular interaction has been verified by systematic molecular dynamics simulation.In addition,an ultrafast charge transfer time of 0.56 ps from the NIR aggregation-induced luminogens of 2TT-oC6B absorber to PolyTPD and PCBM measured by femtosecond transient absorption spectroscopy is beneficial for effective exciton dissociation.The solution-processed organic NIR photodetector exhibits a fast response time of 83μs and a linear dynamic range value of 111 dB under illumination of 830 nm.Therefore,our work has opened up a pioneering window to enhance photoconductivity through in situ photoirradiation and benefit NIR photodetectors as well as other optoelectronic devices.

关键词： AIEgens organic NIR photodetectors photoconductivity

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Carbon nanodots enhanced performance of Cs_(0.15)FA_(0.85)PbI_(3) perovskite solar cells

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Nano Research 2021年第7期14卷 2294-2300页

作者： Yu Gao Wenzhan Xu Fang He Pengbo Nie Qingdan Yang Zhichun Si Hong Meng guodan wei Tsinghua-Berkeley Shenzhen Institute(TBSI) Tsinghua UniversityShenzhen 518000China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518000China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510080China Peking University Shenzhen Graduate School Peking UniversityShenzhen 518055China

A high-quality hybrid Cs_(0.15)FA_(0.85)PbI_(3) thin film is deposited through doping of carbon nanodots(CNDs)into perovskite precursor solution.The corresponding inverted planar perovskite solar cells(PSCs)of ITO/PTAA/Cs_(0.15)FA_(0.85)PbI_(3)/PC_(61)BM/BCP/Ag exhibit an improvement in efficiency from 17.36%to 20.06%,which could be attributed to the passivation of the defects at the crystallized perovskite thin film and enhanced perovskite phase uniformity.The results of electron trap density indicate that the addition of CNDs significantly reduces the defects density at the perovskite thin film and the recombination of charge carriers in transport process is minimized.These results demonstrate that low-cost CNDs are effective additives for passivating defects,further reducing charge carrier recombination and improving device efficiency.

关键词： carbon nanodots perovskite solar cells passivation power conversion efficiency

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Fast Remaining Capacity Estimation for Lithium-ion Batteries Based on Short-time Pulse Test and Gaussian Process Regression

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Energy & Environmental Materials 2023年第3期6卷 238-246页

作者： Aihua Ran Ming Cheng Shuxiao Chen Zheng Liang Zihao Zhou Guangmin Zhou Feiyu Kang Xuan Zhang Baohua Li guodan wei Tsinghua-Berkeley Shenzhen Institute(TBSI) Tsinghua UniversityShenzhen 518055China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China

It remains challenging to effectively estimate the remaining capacity of the secondary lithium-ion batteries that have been widely adopted for consumer electronics,energy storage,and electric vehicles.Herein,by integrating regular real-time current short pulse tests with data-driven Gaussian process regression algorithm,an efficient battery estimation has been successfully developed and validated for batteries with capacity ranging from 100%of the state of health(SOH)to below 50%,reaching an average accuracy as high as 95%.Interestingly,the proposed pulse test strategy for battery capacity measurement could reduce test time by more than 80%compared with regular long charge/discharge tests.The short-term features of the current pulse test were selected for an optimal training process.Data at different voltage stages and state of charge(SOC)are collected and explored to find the most suitable estimation model.In particular,we explore the validity of five different machine-learning methods for estimating capacity driven by pulse features,whereas Gaussian process regression with Matern kernel performs the best,providing guidance for future exploration.The new strategy of combining short pulse tests with machine-learning algorithms could further open window for efficiently forecasting lithium-ion battery remaining capacity.

关键词： capacity estimation data-driven method Gaussian process regression lithium-ion battery pulse tests

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Ultrafast FA0.8PEA0.2SnI3 photodetectors for flexible imaging array with high stability

Ultrafast FA0.8PEA0.2SnI3 photodetectors for flexible imagin...

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第二届全国太阳能电池材料与器件大会

作者： Miao He Zhuhua Xu guodan wei Tsinghua-Berkeley Shenzhen Institute (TBSI) Tsinghua University Tsinghua Shenzhen International Graduate School (SIGS) Tsinghua University

Nontoxic tin-based perovskite is a currently promising material for photoelectrical applications due to its outstanding optical and electrical properties. However, undesired oxidation of Sn2+ to Sn4+ and amounts of intrinsic defects significantly impair their photodetector performance, leading to low detectivity, long response time and atmospheric instability, which further limit their applications in flexible optoelectronics. Herein, the phenylethylammonium(PEA+) is introduced into pristine FASnI3 structure as a large ammonium cation to obtain uniform and stable active layer in photodetector fabrication. The further processed device with structure of ITO/PEDOT:PSS/FA0.8PEA0.2SnI3/PCBM/BCP/Ag exhibits excellent performances with responsivity, detectivity and external quantum efficiency of up to 0.262 A/W, 2.3ⅹ1011 Jones, and 45%, respectively. To note, the as-prepared photodetector device possesses a rise and decay time of 27.7 μs and 20.4 μs responsivity, which is the shortest response time among the reported tin-perovskite photodetectors to the best of our knowledge. Additionally, an unencapsulated tin-based photodetector can continuously work over 7.5 hours in the air and a flexible photodetector still shows an ultrafast response after 10000 bending cycles. Furthermore, typical imaging with high stability can be realized by a flexible 5×5 tin-based photodetector array. This work on tin-based flexible photodetector with PEA+ additive provides systematic and in-depth suggestions to the next-generation flexible optoelectronic device.

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用于可见光和近红外成像的低电压调制的钙钛矿/有机双波段光电探测器

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Science Bulletin 2022年第19期67卷 1982-1990页

作者：高雨赵聪蒲凯何淼蔡万清邓敏聪康飞宇叶轩立韦国丹 Tsinghua-Berkeley Shenzhen Institute Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518000China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518000China State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640China Department of Materials Science and Engineering City University of Hong KongHong KongChina School of Energy and Environment City University of Hong KongHong KongChina

可见光和近红外光双波段光电探测器因其高选择性和灵活多功能,在信号检测、生物成像、光通信和安全监控方面具有应用潜力.本文报道了一种基于钙钛矿/有机异质结结构的双波段探测器,实现了可见光波段和近红外波段具有电压可调制的光电响... 详细信息

可见光和近红外光双波段光电探测器因其高选择性和灵活多功能,在信号检测、生物成像、光通信和安全监控方面具有应用潜力.本文报道了一种基于钙钛矿/有机异质结结构的双波段探测器,实现了可见光波段和近红外波段具有电压可调制的光电响应.即正向偏压下探测器仅对可见光具有光电响应,反向偏压下又仅对近红外光具有光电响应.探测器包括1个吸收可见光(500~810 nm)的钙钛矿层和1个用于近红外光吸收(810~950 nm)的有机层,吸光层顶部和底部的N型载流子传输层则实现了对钙钛矿/有机层中光生载流子的电压可控传输,进而实现可电压调制的可见光/红外光响应.该器件在可见光和近红外波段的峰值响应率分别为93.5和102.2 m A/W,对近红外光的探测度达到了1012 Jones,并在可见光模式和近红外模式下都具有宽动态范围(>120 d B).本文同时实现了这种可电压调制的双波段探测器在可见光和近红外成像中的应用.

关键词：光电探测器电压调制光电响应近红外光反向偏压双波段信号检测近红外成像

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CRISPR/Cas9系统构建 ROCK2 基因敲除肺癌细胞系

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西部医学 2022年第9期34卷 1260-1264,1271页

作者：莫婷张海涛李苑琪余华军李国丹魏婷黄小琴贾玉芳涂名进严秀文广东医科大学生物化学与分子生物学研究所广东湛江524023 广东医科大学生物多肽与蛋白质研究应用重点实验室广东湛江524023 南方海洋科学与工程广东省实验室广东湛江524023

目的利用CRISPR/Cas9编辑系统对人肺癌细胞系A549、H460细胞中Rho相关卷曲螺旋形成蛋白激酶2(ROCK2)基因进行稳定敲除,并对其敲除效果进行验证。初步探讨ROCK2基因敲除肺癌细胞株的细胞水平上的功能改变。方法利用Rock-2 CRISPR质粒和Ro... 详细信息

目的利用CRISPR/Cas9编辑系统对人肺癌细胞系A549、H460细胞中Rho相关卷曲螺旋形成蛋白激酶2(ROCK2)基因进行稳定敲除,并对其敲除效果进行验证。初步探讨ROCK2基因敲除肺癌细胞株的细胞水平上的功能改变。方法利用Rock-2 CRISPR质粒和Rock-2 HDR质粒转染构建A549、H460 ROCK2基因敲除稳定细胞株。蛋白质印迹法验证敲除效果、用定量逆转录-聚合酶链反应(RT-qPCR)检测ROCK2基因的mRNA表达水平。平板克隆形成实验、MTT法检测各细胞株的增殖能力。结果A549、H460肺癌细胞中ROCK2基因稳定敲除株构建成功。与原始细胞株相比,ROCK2敲除株细胞中的蛋白表达水平完全缺失,细胞内的mRNA表达水平显著下降,而且能降低A549、H460肺癌细胞的增殖能力。结论利用CRISPR/Cas9基因编辑系统获得ROCK2基因敲除的肺癌细胞系,为进一步研究ROCK2对肺癌生长的影响奠定基础。

关键词： ROCK2 肺癌 CRISPR/Cas9

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青藏高原高血压患者蛋白尿影响因素分析

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中华地方病学杂志 2021年第8期40卷 616-621页

作者：赵丽明李洪卫周瑶刘兰昕吴勇杜薇付永兴周丹之车千秋施静赵国丹李骞杨夏娇陈金子西藏自治区人民政府驻成都办事处医院心血管内科 610041

目的了解青藏高原高血压患者蛋白尿发生的危险因素。方法采用前瞻性设计,2019年3月至2020年6月,在西藏自治区人民政府驻成都办事处医院心血管内科收集续贯入组的青藏高原高血压患者。对入选患者进行问卷调查、体格检查及血压测量;采集... 详细信息

目的了解青藏高原高血压患者蛋白尿发生的危险因素。方法采用前瞻性设计,2019年3月至2020年6月,在西藏自治区人民政府驻成都办事处医院心血管内科收集续贯入组的青藏高原高血压患者。对入选患者进行问卷调查、体格检查及血压测量;采集空腹静脉血,进行肝功能、血脂、血糖、血红蛋白等检测;取3次非同日晨尿,进行尿蛋白肌酐比值(UACR)检测,按检测结果进行分组,其中UACR<30 mg/g为尿蛋白阴性,UACR≥30 mg/g为尿蛋白阳性;同时对入选患者行颈动脉彩超和心脏彩超检查;并进行蛋白尿的危险因素分析。结果符合入选标准的高血压患者共588例,其中接受降压药物治疗的472例(80.3%),存在降压治疗依从性的239例(40.6%),治疗后血压达标的252例(42.9%);高血压合并糖尿病者150例(25.5%),尿蛋白阳性者126例(21.4%)。在单因素分析中,尿蛋白阳性组(n=126)与阴性组(n=462)比较,民族构成、收缩压[(138.19±19.65)比(133.16±18.45)mmHg,1 mmHg=0.133 kPa]、舒张压[(85.80±13.51)比(83.17±12.19)mmHg]、尿酸[(411.79±101.54)比(379.96±102.18)μmol/L]、血红蛋白[(152.86±30.70)比(143.49±21.15)g/L]、肺动脉主干宽度[(21.76±3.94)比(20.98±3.34)mm]、室间隔厚度[(9.90±1.70)比(9.47±1.60)mm]差异均有统计学意义(P<0.01或<0.05)。在多因素logistic回归分析中,收缩压[比值比(OR)=1.015,95%置信区间(95%CI):1.005~1.026],尿酸(OR=1.003,95%CI:1.001~1.005),肺动脉主干宽度(OR=1.058,95%CI:1.001~1.118)增加均是蛋白尿的危险因素;且藏族相对于汉族发生蛋白尿的风险较低(OR=0.505,95%CI:0.317~0.805),但血红蛋白增高相对于血红蛋白正常发生蛋白尿的风险增加(OR=1.890,95%CI:1.231~2.903)。结论高海拔地区的高血压患者中,血红蛋白增高,收缩压、尿酸、肺动脉主干宽度增加是蛋白尿发生的危险因素;与藏族高血压患者相比,汉族高血压患者发生蛋白尿的风险更高。

关键词：高血压蛋白尿高原

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广东优质籼稻陈化过程理化品质变化情况及相关性研究

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粮食加工 2019年第5期44卷 43-46页

作者：谢宇霞万娟吴秋婷吴军辉老国丹陈威钟国才王亚军广东省粮食科学研究所

选取广东地区种植的5个优质籼稻谷品种,通过模拟南方高温高潮储藏环境,分析陈化过程中稻谷的基本理化指标、品质指标等变化情况,并进行了各指标的相关性分析。结果表明:随着储藏时间的加长,稻米的直链淀粉含量、脂肪酸值越来越高,而出... 详细信息

选取广东地区种植的5个优质籼稻谷品种,通过模拟南方高温高潮储藏环境,分析陈化过程中稻谷的基本理化指标、品质指标等变化情况,并进行了各指标的相关性分析。结果表明:随着储藏时间的加长,稻米的直链淀粉含量、脂肪酸值越来越高,而出糙率、整精米率、品尝评分值、过氧化氢酶活性等均越来越低,说明随着陈化的不断加深,米质和口感都不断下降。模拟陈化1个月后,脂肪酸值(KOH)已达20.2 mg/100 g,5个月后,脂肪酸值已达轻度不易存,食味品质评分值达70分以下,品质逐渐变差。直链淀粉含量和整精米率在陈化初期变化幅度不大,在陈化后期出现较大幅度地改变。通过相关性分析得出稻谷储藏时间与直链淀粉、脂肪酸值呈极显著正相关,与出糙率、整精米率、品尝评分值及过氧化氢酶活性呈极显著负相关。

关键词：优质籼稻陈化理化品质相关性

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