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ZnO/ZnS core-shell composites for low-temperature-processed perovskite solar cells

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Journal of Energy Chemistry 2018年第5期27卷 1461-1467页

作者： Enqiang Zheng Yaqin Wang Jiaxing song Xiao-Feng Wang Wenjing Tian Gang Chen tsutomu miyasaka Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) College of Physics Jilin University Changchun 130012 Jilin China State Key Laboratory of Supramolecular Structure and Materials. Jilin University Changchun 130012 Jilin China Graduate School of Engineering Toin University of Yokohama 1614 Kurogane-cho Aoba Yokohama Kanagawa 225-8503 Japan

Electron transport layers （ETLs） in perovskite solar cells （PSCs） are a key factor to determine the photo- voltaic performance. Herein, we demonstrate preparation of ZnO/ZnS core-shell composites through di- rectly synthesizing ZnS on the ZnO nanoparticles in solution. We confirmed the formation of ZnO/ZnS core-shell composites by the uses of X-ray diffraction patterns and the Fourier transform infrared spec- troscopy. ZnO/ZnS composites exhibit much homogeneous surface morphology as compared with the bare ZnO as revealed in the scanning electronic microscopy. Moreover, the upper shift of conduction band level upon composition of the ZnO/ZnS film results in a better alignment of energy level, which facilitates cas- cade charge extraction and thus improves the current density of perovskite solar cell. The shift of conduc- tion band also improves the voltage of the PSCs. The photoluminescence （PL） spectroscopies measured in both steady and transient states were carried out to characterize the charge extraction at the interface between CH_3NH_3Pbl_3 and the electron transport layers of either ZnO or ZnO/ZnS composite. The ZnO/ZnS composite can more efficiently quench the PL signal of perovskite absorber than bare ZnO resulting in enhanced photocurrent generation in PSCs.

关键词： ZnO/ZnS Electron transport layer Low-temperature-processed Chemical conversion Perovskite solar cells

Chlorophyll Derivative-Sensitized TiO2 Electron Transport Layer for Record Efficiency of Cs2AgBiBr6 Double Perovskite Solar Cells

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Chlorophyll Derivative-Sensitized TiO2 Electron Transport La...

第八届新型太阳能材料科学与技术学术研讨会

作者： Baoning Wang Na Li Lin Yang Chunxiang Dall’Agnese Ajay Kumar Jena Shinichi Sasaki tsutomu miyasaka Hitoshi Tamiaki Xiao-Feng Wang Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) College of PhysicsJilin University

The power conversion efficiency(PCE) of Cs AgBiBr-based perovskite solar cells(PSCs) is still low owing to the inherent defects of Cs AgBiBr films. Herein, we demonstrate a carboxy-chlorophyll derivative(C-Chl)-sensitized mesoporous TiO(m-TiO) film as an electron transport layer(ETL) to enhance and extend the absorption spectrum of Cs AgBiBr-based PSCs. The C-Chl-based device achieves a significantly improved PCE, exceeding 3% for the first time, with an increase of 27% in short-circuit current density. Optoelectronic investigations confirm that the introduction of C-Chl reduces the defects, accelerates the electron extraction, and suppresses charge recombination at the interface of ETL/perovskite. Moreover, the unencapsulated PSCs display restrained hysteresis and great stability under ambient conditions.

关键词： Chlorophyll derivative Cs2AgBiBr6 Solar cells

Surface-Modified Metallic Ti3C2Tx MXene as Electron Transport Layer for Planar Heterojunction Perovskite Solar Cells

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Surface-Modified Metallic Ti3C2Tx MXene as Electron Transpor...

第七届新型太阳能电池材料科学与技术学术研讨会

作者： Lin Yang Chunxiang Dall’Agnese Yohan Dall’Agnese Gang Chen Yu Gao Yoshitaka Sanehira Ajay Kumar Jena Xiao-Feng Wang Yury Gogotsi tsutomu miyasaka Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University

MXenes are a large and rapidly expanding family of two-dimensional(2 D) materials which,owing to their unique optoelectronic properties and tunable surface termination,find a wide range of applications including energy storage and energy *** this work,TiCT MXene nanosheets are applied as a novel type of electron transport layer(ETL) in low-temperature processed planar-structured perovskite solar cells(PSCs).Interestingly,simple UV-ozone treatment of the metallic TiCT that increases the surface Ti-O bonds without any change in its bulk properties like high electron mobility improves its suitability as an *** electron transfer and suppressed recombination at the ETL/perovskite interface results in augmentation of the power conversion efficiency(PCE) from 5.00% in the case of TiCT without UV-ozone treatment to the champion PCE of 17.17%,achieved using the TiCT film after 30 minutes of UV-ozone *** the first report on the use of pure MXene layer as an ETL in PSCs,this work shows great potential of MXenes to be used in PSCs and displays their promises for applications in photovoltaic technology in general.

关键词： UV-ozone treatment Ti3C2Tx MXene electron transport layers perovskite solar cells

Semantic segmentation-based semantic communication system for image transmission

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Digital Communications and Networks 2024年第3期10卷 519-527页

作者： Jiale Wu Celimuge Wu Yangfei Lin tsutomu Yoshinaga Lei Zhong Xianfu Chen Yusheng Ji The University of Electro-Communication Tokyo182-8585Japan Toyota Motor Corporation Tokyo112-8701Japan VTT Technical Research Centre of Finland OuluFinland National Institute of Informatics(NII) Tokyo101-8430Japan

With the rapid development of artificial intelligence and the widespread use of the Internet of Things, semantic communication, as an emerging communication paradigm, has been attracting great interest. Taking image transmission as an example, from the semantic communication's view, not all pixels in the images are equally important for certain receivers. The existing semantic communication systems directly perform semantic encoding and decoding on the whole image, in which the region of interest cannot be identified. In this paper, we propose a novel semantic communication system for image transmission that can distinguish between Regions Of Interest (ROI) and Regions Of Non-Interest (RONI) based on semantic segmentation, where a semantic segmentation algorithm is used to classify each pixel of the image and distinguish ROI and RONI. The system also enables high-quality transmission of ROI with lower communication overheads by transmissions through different semantic communication networks with different bandwidth requirements. An improved metric θPSNR is proposed to evaluate the transmission accuracy of the novel semantic transmission network. Experimental results show that our proposed system achieves a significant performance improvement compared with existing approaches, namely, existing semantic communication approaches and the conventional approach without semantics.

关键词： Semantic Communication Semantic segmentation Image transmission Image compression Deep learning

Féeton(B-L gauge boson)dark matter for the 511-keV gamma-ray excess and the prediction of low-energy neutrino flux

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Chinese Physics C 2024年第8期48卷 76-82页

作者： Jie Sheng Yu Cheng Weikang Lin tsutomu T.Yanagida Tsung-Dao Lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityChina Key Laboratory for Particle Astrophysics and Cosmology(MOE)&Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai Jiao Tong UniversityShanghai 200240China South-Western Institute For Astronomy Research Yunnan UniversityKunming 650500China Kavli IPMU(WPI) UTIASUniversity of TokyoKashiwa277-8583Japan

The féeton is the gauge boson of the U(1)_(B−L) gauge *** the gauge coupling constant is extremely small,the féeton becomes a candidate for dark *** show that its decay to a pair of an electron and a positron explains the observed Galactic 511-keV gamma-ray excess in a consistent *** féeton dark matter decays mainly into pairs neutrino and *** low-energy experiments with improved directional capability will enable capturing these neutrino *** seesaw-motivated parameter space predicts a relatively short féeton lifetime that is comparable to the current cosmological constraint.

关键词： feeton 511-keV gamma-ray excess low-energy neutrino

Performance improvement of MXene-based perovskite solar cells upon property transition from metallic to semiconductive by oxidation of Ti3C2Tx in air

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Performance improvement of MXene-based perovskite solar cell...

第八届新型太阳能材料科学与技术学术研讨会

作者： Lin Yang Dongxiao Kan Chunxiang Dall’Agnese Yohan Dall’Agnese Baoning Wang Ajay Kumar Jena Yingjin Wei Gang Chen Xiao-Feng Wang Yury Gogotsi tsutomu miyasaka Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) College of PhysicsJilin University

The unique properties of MXenes that arise from terminated functional groups and oxidization of MXenes make them attractive for application in photovoltaic devices like perovskite solar cells(PSCs). Here, oxidation of TiCT hydrocolloid was carried out to tune its properties desirable for an electron transport layer(ETL) in low-temperature processed PSCs. The calculations of the energy levels were carried out by the Vienna ab initio Simulation Package(VASP) code based on density functional theory(DFT). Oxidation of TiCT can generate Ti-O bonds and effectively reduce the defects of the film fabricated by spin-coating, while a transition from metallic material to semiconductor occurred after heavy oxidation. A better matching of energy levels between perovskite and ETL layer in the case of a hybrid of oxidized and pristine TiCT renders a champion power conversion efficiency(PCE) of 18.29 %. The improvement in PCE can be attributed to the increased electron mobility in the ETL, which promotes electron transport and reduces the electronhole recombination. Hence, by presenting a simple method for high performance in PSCs by MXene-derived materials, the work demonstrates the great potential of these materials for applications in low-temperature processed PSCs and other photovoltaic technologies.

关键词： Ti3C2Tx MXene electron transport layers perovskite solar cells DFT calculations

基于低温处理ZnO-SnO2纳米复合材料的高效平面钙钛矿太阳能电池

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基于低温处理ZnO-SnO2纳米复合材料的高效平面钙钛矿太阳能电池

中国化学会第30届学术年会-第二十二分会：有机光伏的机遇和挑战

作者：宋嘉兴郑恩强王晓峰田文晶 tsutomu miyasaka 吉林大学超分子结构与材料国家重点实验室吉林大学新型电池物理与技术教育部重点实验室桐荫横滨大学

在有机卤素钙钛矿太阳能电池中,电子收集层是决定器件效率最关键的因素之一。我们在低温条件下制备了具有不同Zn/Sn比率的ZnO–SnO纳米复合材料用于基于CHNHPbI的平面结构的钙钛矿太阳能电池的制备。经过优化后,基于含有89mol%ZnO的ZnO... 详细信息

在有机卤素钙钛矿太阳能电池中,电子收集层是决定器件效率最关键的因素之一。我们在低温条件下制备了具有不同Zn/Sn比率的ZnO–SnO纳米复合材料用于基于CHNHPbI的平面结构的钙钛矿太阳能电池的制备。经过优化后,基于含有89mol%ZnO的ZnO–SnO复合材料的器件相比于基于ZnO的器件具有更高的效率。我们运用稳态和瞬态的光致发光谱和电化学阻抗谱来表征CHNHPbI和不同电子收集材料的界面,发现基于ZnO–SnO电子收集层的钙钛矿太阳能电池的高效率同时归因于高的电荷收集效率和界面处大的电荷复合电阻。CHNHPbI吸收层的热稳定性和相应电池的耐老化性都依赖于电子收集层,表现为SnO>ZnO–SnO>ZnO,表明在环境条件下羟基诱导的CHNHPbI分解可能是其最主要因素。此外,通过引入低温处理的AlO作为ZnO–SnO复合材料的覆盖层,最优的器件效率进一步提高到15.2%。

关键词： ZnO–SnO2 电子收集层低温处理平面钙钛矿太阳能电池

基于低温SnO2电子选择接触层高效且稳定的钙钛矿太阳能电池

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基于低温SnO2电子选择接触层高效且稳定的钙钛矿太阳能电池

第二届新型太阳能电池学术研讨会

作者：宋嘉兴郑恩强边佶王晓峰田文晶 Yoshitaka Sanehira tsutomu miyasaka 吉林大学超分子结构与材料国家重点实验室吉林大学新型电池物理与技术教育部重点实验室桐荫横滨大学

近年来,钙钛矿太阳能电池成为下一代光伏技术中最为闪耀的明星,基于低温溶液处理的平面异质结钙钛矿太阳能电池因为其易于制备且能耗低等优势备受研究者青睐。我们以低温旋涂的SnO层作为基于CHNHPbI平面异质结钙钛矿太阳能电池的电子选... 详细信息

近年来,钙钛矿太阳能电池成为下一代光伏技术中最为闪耀的明星,基于低温溶液处理的平面异质结钙钛矿太阳能电池因为其易于制备且能耗低等优势备受研究者青睐。我们以低温旋涂的SnO层作为基于CHNHPbI平面异质结钙钛矿太阳能电池的电子选择接触,并且采用一种改进的连续沉积方法,以一种等效于溶剂蒸气退火(SVA)的过程来控制PbI前驱体的晶粒尺寸从而在SnO上制得CHNHPbI。我们发现,伴随着SVA过程,残留的Pb I2纳米晶可以稳定的存在于CHNHPbI/SnO界面从而起到一种钝化作用;此外,基于SnO的钙钛矿太阳能电池的光伏性能同时依赖于SVA时间和钙钛矿层的厚度,优化后的器件在模拟太阳光的照射下能量转化效率最高可以达到13%,并且储存在环境空气条件下30天表现出很高的耐久性。

关键词：平面异质结 SnO2 溶剂蒸气退火(SVA)

Correlation between dose-volume parameters and rectal bleeding after 12 fractions of carbon ion radiotherapy for prostate cancer

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World Journal of Radiology 2024年第7期16卷 256-264页

作者： Takashi Ono Hiraku Sato Yuya miyasaka Yasuhito Hagiwara Natsuko Yano Hiroko Akamatsu Mayumi Harada Mayumi Ichikawa Department of Radiation Oncology Faculty of MedicineYamagata UniversityYamagata 990-9585Japan Department of Heavy Particle Medical Science Yamagata University Graduate School of Medical ScienceYamagata 990-9585Japan

BACKGROUND Carbon ion radiotherapy(CIRT)is currently used to treat prostate *** bleeding is a major cause of toxicity even with ***,to date,a correlation between the dose and volume parameters of the 12 fractions of CIRT for prostate cancer and rectal bleeding has not been ***,the clinical risk factors for rectal bleeding were absent after 12 fractions of *** To identify the risk factors for rectal bleeding in 12 fractions of CIRT for prostate *** Among 259 patients who received 51.6 Gy[relative biological effectiveness(RBE)],in 12 fractions of CIRT,15 had grade 1(5.8%)and nine had grade 2 rectal bleeding(3.5%).The dose-volume parameters included the volume(cc)of the rectum irradiated with at least x Gy(RBE)(Vx)and the minimum dose in the most irradiated x cc normal rectal volume(Dx).RESULTS The mean values of D6cc,D2cc,V10 Gy(RBE),V20 Gy(RBE),V30 Gy(RBE),and V40 Gy(RBE)were significantly higher in the patients with rectal bleeding than in those *** cutoff values were D6cc=34.34 Gy(RBE),D2cc=46.46 Gy(RBE),V10 Gy(RBE)=9.85 cc,V20 Gy(RBE)=7.00 cc,V30 Gy(RBE)=6.91 cc,and V40 Gy(RBE)=4.26 *** D2cc,V10 Gy(RBE),and V20 Gy(RBE)cutoff values were significant predictors of grade 2 rectal *** The above dose-volume parameters may serve as guidelines for preventing rectal bleeding after 12 fractions of CIRT for prostate cancer.

关键词： Carbon ion radiotherapy Prostate cancer Rectal bleeding Dose volume parameters Prevention