检索结果-南通市图书馆

A non-fullerene acceptor enables efficient P3HT-based organic solar cells with small voltage loss and thickness insensitivity

引用

Chinese Chemical Letters 2019年第6期30卷 1277-1281页

作者： Ning Wang Weitao Yang shuixing li Minmin Shi Tsz-Ki Lau Xinhui Lu Rafi Shikler Chang-Zhi li Hongzheng Chen MOE Key Laboratory of Macromolecular Synthesis and Functionalization State Key Laboratory of Silicon Materials Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Department of Physics The Chinese University of Hong Kong Hong Kong 999077 China Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Beer-Sheva 8410501 Israel

Poly(3-hexylthiophene)(P3HT) is a low-cost polymer donor for organic solar cells (OSCs). However, the P3HT-based OSCs usually give low power conversion efficiencies (PCEs) due to the wide bandgap and the high-lying energy levels of P3HT. To solve this problem, in this work, we design and synthesize a new A-D-A type non-fullerene acceptor, DFPCBR, which owns an electron-donating (D) core constructed by linking a 2,5-difluorobenzene ring with two cyclopentadithiophene moieties, and two electron-accepting (A) end-groups of benzo[c][1,2,5]thiadiazole connected with 3-ethyl-2-thioxothiazolidin-4-one. Because of the strong electron-donating ability and large conjugation effect of D core, DFPCBR shows appropriate energy levels and a narrow bandgap matching well with those of P3HT. Therefore, with P3HT as the donor and DFPCBR as the acceptor, the OSCs possess broad absorption range from 350 nm to 780 nm and the reduced energy loss (Eloss) of 0.79 eV (compared with ~1.40 eV for the P3HT:PC61BM device), providing a good PCE of 5.34% with a high open-circuit voltage (VOC) of 0.80 V. Besides, we observe that the photovoltaic performances of these devices are insensitive to the thickness of the active layers:even if the active layer is as thick as 320 nm,~80%of the best PCE is maintained, which is rarely reported for fullerene-free P3HT-based OSCs, suggesting that DFPCBR has the potential application in commercial OSCs in the future.

关键词： Poly(3-hexylthiophene) Non-fullerene acceptors Organic solar cells Energy loss Thickness insensitivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Design of Non-fused Ring Acceptors toward High-Performance,Stable,and Low-Cost Organic Photovoltaics

引用

Accounts of Materials Research 2022年第6期3卷 644-657页

作者： Qing Shen Chengliang He shuixing li lijian Zuo Minmin Shi Hongzheng Chen State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationInternational Research Center for X PolymersDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027P.R.China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Hangzhou 310027P.R.China

Toward future commercial applications of organic solar cells(OSCs),organic photovoltaic materials that enable high efficiency,excellent stability,and low cost should be ***-ring electron acceptors(FREAs)have declared that OSCs are capable of showing efficiencies over 19%,whereas stability and cost are not solved *** the counterparts of FREAs,non-fused ring electron acceptors(NFREAs)are more flexible in molecular *** have better stability because of the reduction of intramolecular tension via breaking fused backbone and have more advantages in cost with the reduction of synthetic ***,the challenge for NFREAs is the relatively lower efficiencies(around 15%at current stage),which require better molecular designs for addressing the issues of conformational unicity and effective molecular *** this Account,we comprehensively summarize works about NFREAs carried out in our group from three main frameworks,including molecular design and efficiency optimization,material cost,and ***,in the part of molecular design and efficiency optimization,the existing rotatable single bond in NFREAs will bring the problem of conformational uncertainty,but it can be solved through proper molecular design,which also regulates the energy levels,light absorption range,and the packing mode of the molecule for obtaining higher ***,in this part,we discuss the evolution of NFREAs in three aspects,including molecular skeleton optimization,terminal modification,and side chain *** strategies are used in the design of a molecular skeleton,such as utilizing the quinoid effect,introducing functional groups with the electron push−pulling effect,and using multiple conformational ***,simplifying the skeleton is also the preferred development *** for the terminal,the main modification strategy is adjusting the conjugation length and halogen *** is more,by adjusting the side chain to induce appropr

关键词： stability fused stability

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Can urban forests provide acoustic refuges for birds?Investigating the influence of vegetation structure and anthropogenic noise on bird sound diversity

引用

Journal of Forestry Research 2024年第2期35卷 163-175页

作者： Zezhou Hao Chengyun Zhang Le li Bing Sun shuixing Luo Juyang liao Qingfei Wang Ruichen Wu Xinhui Xu Christopher A.Lepczyk Nancai Pei Research Institute of Tropical Forestry Chinese Academy of ForestryGuangzhou 510520People’s Republic of China School of Electronics and Communication Engineering Guangzhou UniversityGuangzhou 510006People’s Republic of China Hunan Botanical Barden Changsha 410116People’s Republic of China Guangdong Eco-Engineering Polytechnic Guangzhou 510520People’s Republic of China College of Forestry Wildlife and EnvironmentAuburn UniversityAuburnAL 36849USA

As a crucial component of terrestrial ecosystems,urban forests play a pivotal role in protecting urban biodiversity by providing suitable habitats for acoustic *** studies note that vegetation structure is a key factor influencing bird sounds in urban forests;hence,adjusting the frequency composition may be a strategy for birds to avoid anthropogenic noise to mask their ***,it is unknown whether the response mechanisms of bird vocalizations to vegetation structure remain consistent despite being impacted by anthropogenic *** was hypothesized that anthropogenic noise in urban forests occupies the low-frequency space of bird songs,leading to a possible reshaping of the acoustic niches of forests,and the vegetation structure of urban forests is the critical factor that shapes the acoustic space for bird *** acoustic monitoring in various urban forests was used to monitor natural and anthropogenic noises,and sounds were classified into three acoustic scenes(bird sounds,human sounds,and bird-human sounds)to determine interconnections between bird sounds,anthropogenic noise,and vegetation *** noise altered the acoustic niche of urban forests by intruding into the low-frequency space used by birds,and vegetation structures related to volume(trunk volume and branch volume)and density(number of branches and leaf area index)significantly impact the diversity of bird *** findings indicate that the response to low and high frequency signals to vegetation structure is *** clarifying this relationship,our results contribute to understanding of how vegetation structure influences bird sounds in urban forests impacted by anthropogenic noise.

关键词： Anthropogenic noise Bird sounds Urban forests Vegetation structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modulating morphology via side-chain engineering of fused ring electron acceptors for high performance organic solar cells

引用

Science China Chemistry 2019年第6期62卷 790-796页

作者： Fuwen Zhao Dan He Jingming Xin shuixing Dai Han Xue li Jiang Zhixiang Wei Wei Ma Xiaowei Zhan Yongfang li Chunru Wang Institute of Chemistry Chinese Academy of Sciences State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Department of Materials Science and Engineering College of Engineering Peking University National Center for Nanoscience and Technology

In this work, four fused ring electron acceptors(FREAs), 2F-C5, 2F-C6, 2F-C8 and 2F-C10, are developed to investigate the effect of side-chain size on the molecular properties and photovoltaic performance of FREA systematically. The elongation of side-chains in the FREAs not only improves their solubility in the processing solvent, but also enhances their miscibility with the donor PBDB-T. It helps the FREA diffuse into the donor PBDB-T during film-formation, thus leading to the decrease in domain size and domain purity from PBDB-T:2F-C5 to PBDB-T:2F-C10 blend films in sequence. The smaller domain size affords more D/A interfaces to benefit exciton dissociation and inhibit monomolecular recombination. However, severe bimolecular recombination occurs when the domain purity decreases to a critical point. Due to the dual function of the increment of side-chain length, both short-circuit current density(J_(SC)) and fill factor(FF) of devices exhibit an evolution of first increasing then decreasing from 2F-C5, 2F-C6, 2F-C8 to 2F-C10 based OSCs. The PBDB-T:2F-C8 based OSCs get a fine balance in morphology with moderate domain size as well as high domain purity simultaneously for the least charge carrier recombination, thus achieving the highest power conversion efficiency of 12.28% with the best J_(SC)(21.27 mA cm^(-2)) and FF(71.96%).

关键词： solar cells fused ring electron acceptor side-chain length morphology

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Advances in magnetic particle imaging and perspectives on liver imaging

引用

iliVER 2022年第4期1卷 237-244页

作者： Wei li Xiaohua Jia lin Yin Zhiyun Yang Hui Hui Jianlin li Wenhui Huang Jie Tian shuixing Zhang Department of Radiology The First Affiliated HospitalJinan UniversityNo.613Huangpu West RoadTianhe DistrictGuangzhou510627GuangdongChina CAS Key Laboratory of Molecular Imaging Institute of AutomationBeijing100190China Beijing Key Laboratory of Molecular Imaging Beijing100190China University of Chinese Academy of Sciences Beijing100080China School of Food Science and Pharmaceutical Engineering Nanjing Normal UniversityNanjing 210023China Beijing Advanced Innovation Center for Big Data-Based Precision Medicine School of Engineering MedicineBeihang UniversityBeijing100083China Zhuhai Precision Medical Center Zhuhai People's HospitalAffiliated with Jinan UniversityZhuhai519000China

Magnetic particle imaging(MPI)is an emerging technique to visualize the spatial distribution of super-paramagnetic iron oxide with high temporal–spatial resolution,high sensitivity,unlimited image depth,and true quantitative *** is based on the nonlinear response of superparamagnetic iron oxide in an alter-nating magnetic field without tissue background *** is a promising imaging modality for various applica-tions,including vascular imaging,cell tracking,tumor imaging,and catheter *** applications of liver imaging could be improved or created with *** this review,we cover the principle and construction of MPI,we evaluate the features and advantages of MPI with relation to its own rationale and via comparison with other imaging modalities,and we review MPI liver imaging applications with a view toward assisting hepatic researchers in drawing inspiration.

关键词： Magnetic particle imaging liver imaging SPIO

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Safety and Diagnostic Image Quality of Ultravist<sup>®</sup>in an Unselected Sub-Set of Chinese Patients: Data Analyses from a Previous Post Marketing Surveillance

引用

Open Journal of Radiology 2017年第1期7卷 63-74页

作者： shuixing Zhang Changhong liang Ziping li Jary Wang Department of Radiology Guangdong General Hospital/Guangdong Academy of Medical Sciences Guangzhou China Department of Radiology The First Affiliated Hospital of Sun Yat-sen University Guangzhou China Medical & Scientific Affairs Bayer HealthCare Pharmaceuticals Beijing China

Background: Iopromide (Ultravist®) has been shown to be a very safe CM agent in previous post-marketing surveillance studies on Western and Asian populations. Our study aimed to analyse data pertaining to the safety, tolerability and diagnostic image quality of Iopromide in an unselected sub-set of the Chinese population. Methods: we analysed data for Chinese ambulatory and in-patients who received Iopromide for an imaging procedure (in accordance with the local package insert and routine clinical practice), as part of an international post-marketing surveillance study. Use of premedication was at the discretion of the attending physician. Patient demographics, clinical history, type of examination, contrast quality and tolerability, including pre-specified adverse drug reactions, were recorded. All statistical analyses were descriptive. Results: case report forms for 20,000 Chinese patients (61.3% men) were analysed, of whom 153 patients (0.77%) had risk factors for idiosyncratic contrast media reactions (at-risk group). Use of premedication, most commonly corticosteroids, was recorded for 5658 patients (28.3%) and 86 at-risk patients (56.2% of the at-risk group), respectively. The mean (±standard deviation) dose of iodine administered was 29 ± 5.5 g. During the physician’s evaluation of image parameters, contrast quality was considered to be “good” (64.7%) or “excellent” (29.3%) in the majority of patients. 571 patients (2.9%) experienced at least one adverse drug reaction [most frequently nausea (0.70%) and dysgeusia (0.62%)], which were typically transient and of mild intensity. Two serious adverse drug reactions were reported [edema (n = 1), decreased blood pressure and dyspnea (n = 1)]. The incidence of adverse drug reactions was increased in the at-risk group versus the overall patient population, and tended to reduce with premedication (mainly corticosteroids). Conclusions: Iopromide was well tolerated and proved to be an efficient contrast agent in a lar

关键词： Contrast Media Iopromide Adverse Drug Reaction Chinese Sub-Population Post-Marketing Surveillance

来源：

维普期刊数据库评论