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| 1 | Organic thin-film solar cells:Devices and materials显示文摘In recent years, the performance of organic thin-film solar cells has gained rapid progress, of which the power conversion efficiencies (ηp) of 3%-5% are commonly achieved, which were difficult to obtain years ago and are improving steadily now. The ηp of 7.4% was achieved in the year 2010, and ηp of 9.2% was disclosed and confirmed at website of Mitsubishi Chemical in April, 2011. The promising future is that the ηp of 10% is achievable according to simulation results. Apparently, these are attributed to material innovations, new device structures, and also the better understanding of device physics. This article summarizes recent progress in organic thin-film solar cells related to materials, device structures and working principles. In the device functioning part, after each brief summary of the working principle, the methods for improvements, such as absorption increment, organic/electrode interface engineering, morphological issues, are addressed and summarized accordingly. In addition, for the purpose of increasing exciton diffusion efficiency, the benefit from triplet exciton, which has been proposed in recent years, is highlighted. In the active material parts, the chemical nature of materials and its impact on device performance are discussed. Particularly, emphasis is given toward the insight for better understanding device physics as well as improvements in device performance either by development of new materials or by new device architecture. | LI ZhiGang1, ZHAO XinYan2, LI Xin1,2, GAO ZhiQiang1, MI BaoXiu1 & HUANG Wei2 1Jiangsu Engineering Centre for Flat-Panel Displays & Solid-state Lighting and School of Materials Science & Engineering, Nanjing University of Posts & Telecommunications, Nanjing 210046, China 2Key Laboratory for Organic Electronics & Information Displays (KLOEID) Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing 210046, China | 2012 | Science China Chemistry2012，55，4： | 9 |
| 2 | Triazatruxene-containing hyperbranched polymers:Microwave-assisted synthesis and optoelectronic properties显示文摘Hyperbranched polymer structures represent a class of high-functionality building blocks with excellent three-dimensional topology for the construction of highly substituted conjugated polymers.In this contribution,an efficient microwave synthesis protocol toward the synthesis of conjugated hyperbranched polymers is presented.A novel series of soluble hyperbranched polyfluorenes (PTF1-PTF3) incorporating triazatruxene moiety as the branch units with various branching degrees have thus been successfully constructed with good yields and high molecular weight via a facile 'A2+B2+C3' approach.The structures of the hyperbranched polymers were confirmed by NMR and GPC.Their thermal,optical,and electrochemical properties of the hyperbranched polymers were also investigated.The results showed that introduction of triazatruxene units into the hyperbranched structure endowed the polymer with good thermal stability and highly amorphous properties.Photophysical investigation of PTFx revealed strong blue emission in both solution and solid states.Hyperbranched polymers with higher degree of branching and proper content of linear fluorene units exhibited better photophysical properties in terms of narrow emission spectra and relatively high quantum efficiency as well as improved thermal spectral stability.The triazatruxene branching unit also played a role in raising the HOMO energy levels relative to those of polyfluorenes that would help to improve the charge injection and transport properties.The incorporation of triazatruxene unit into hyperbranched polymers has thus explored an effective avenue for constructing optoelectronic polymers with improved functional characteristics. | LAI WenYong,LIU Dong & HUANG Wei Key Laboratory for Organic Electronics & Information Displays (KLOEID) Institute of Advanced Materials (IAM),Nanjing University of Posts & Telecommunications,Nanjing 210046,China | 2010 | Science China Chemistry2010，53，12： | 4 |
| 3 | Molecular hosts for triplet emitters in organic light-emitting diodes and the corresponding working principle显示文摘This paper summarizes the mechanism and routes for excitation of triplet emitters in dopant emission based phosphorescent organic light-emitting diodes (PhOLEDs),providing a comprehensive overview of recent progress in molecular hosts for triplet emitters in PhOLEDs.Particularly,based on the nature of different hosts,e.g.,hole transporting,electron transporting or bipolar materials,in which the dopant emitters can be hosted to generate phosphorescence,the respective device performances are summarized and compared.Highlights are given to the relationships among the molecular structure,thermal stability,triplet energy,carrier mobility,molecular orbital energy level and their corresponding device performances. | MI BaoXiu1,2,GAO ZhiQiang1,LIAO ZhangJin2,HUANG Wei2 & CHEN Chin Hsin3 1Jiangsu Engineering Center for Flat-Panel Displays & Solid-State Lighting School of Materials Science & Engineering,Nanjing University of Posts & Telecommunications,Nanjing 210046,China 2Key Laboratory for Organic Electronics & Information Displays (KLOEID),Institute of Advanced Materials (IAM),Nanjing University of Posts & Telecommunications,Nanjing 210046,China 3Display Institute,Microelectronics and Information Systems Research Center,National Chiao Tung University Hsinchu,Hsinchu,300 China | 2010 | Science China Chemistry2010，53，8： | 4 |
| 4 | Synthesis,characterization and applications of vinylsilafluorene copolymers:New host materials for electroluminescent devices显示文摘Vinylsilafluorene(VSiF) was successfully synthesized and copolymerized with vinylcarbazole and methyl methacrylate via free radical copolymerization for the first time.The synthesis,photophysical properties,computational modeling studies,and organic light-emitting devices of the VSiF copolymers were presented.The good coordinated photoluminescent(PL) spectra with the absorption of blue light-emitting materials and the high energy band-gap of the VSiF copolymers were observed.Higher triplet band gap(3Eg) to host the blue phosphorescent emitters and better HOMO and LUMO than PVK for electron and hole injection and transportation of the VSiF model compounds were revealed by density functional theory(DFT) calculations.The preliminary device results in applications of these copolymers as host materials for green phosphorescent emitters demonstrate the copolymers of VSiF and vinylcarbazole have comparable device performance of polyvinylcarazole(PVK),suggesting a bright future of VSiF as building blocks for host materials. | CHEN RunFeng,ZHU Rui,ZHENG Chao,FAN QuLi & HUANG Wei* Key Laboratory for Organic Electronics & Information Displays(KLOEID) Institute of Advanced Materials(IAM),Nanjing University of Posts and Telecommunications(NUPT),Nanjing 210046,China | 2010 | Science China Chemistry2010，53，11： | 2 |
| 5 | Etiology of preterm premature rupture of membranes显示文摘 | Shubert PJ Diss E Iams JD | 1992 | Obstet Gynecol Clinnorth AM1992，19，： | 1 |
| 6 | Epidemiology and causes of preterm birth 显示文摘 | Goldenberg RL Culhane JF Iams JD | 2008 | Lancet2008，371，9606： | 1 |
| 7 | Firm size and dynamic technological innovation显示文摘 | Gregory N. Stock Noel P. Greis Wil iam A. Fischer | | 0，，22： | 1 |
| 8 | Increased matenal plasma leptin in early pregnancy and risk of gestational diabetes mellitus 显示文摘 | Qiu c Will iams M A Vadachkor ia S | 2004 | Obstet Gynecol2004，103，3： | 1 |
| 9 | Etiology of preterm premature rupture of the membranes显示文摘 | Shubert P J Diss E Iams J D | | 0，，02： | 1 |
| 10 | Epidemiology and causes of preterm birth 显示文摘 | Goldenberg RL Culhane JF Iams JD | 2008 | Lancet2008，371，9606： | 1 |
| 11 | Intercellular communication and cell proliferation in precision-cut rat liver slice:effect of medium composition and DDT显示文摘 | Graaf IAM de Tajima O Groten JP | 2000 | Cancer Lett2000，154，： | 1 |
| 12 | Prediction and early detection of preterm birth 显示文摘 | Iams | 2003 | Obstet Gynecol2003，101，： | 1 |
| 13 | Auditor Liability to Third Parties:An International Focus显示文摘 | Carl Pacini Wil iam Hil ison David Sinason | | 0，，08： | 1 |
| 14 | A new look at pelvicrelax -ation显示文摘 | Richardson AC Lyon JB Wil iams NL | | 0，，05： | 1 |
| 15 | Successful short-segment and fusion for thoracolumbar spine fractures:a consecutive 41/2-year series显示文摘 | Parker JW Iame JR Karaikovic EE et a/ | 2000 | Spine(Phila Pa 1976)2000，25，9： | 1 |
| 16 | The preterm prediction study: risk factors in twin gestation 显示文摘 | Goldenberg RL Iams JD Moodovnik M | 1996 | Obstet Gynecol1996，175，10： | 1 |
| 17 | Small for gestational age (SGA) and fetal growth restriction (FGR)显示文摘 | Iams JD | 2010 | Am J Obstet Gynecol2010，202，6： | 1 |
| 18 | Treatment of Proxi-maj Ureteral Calculi:YAG Laser Ureterolitho-tripsy Versus Extracorpreal Shock Waxe Lithotripsy显示文摘 | Iam J S Greene T D Gupta M | 2002 | J Urol2002，167，5： | 1 |
| 19 | The torque and tilt gamble 显示文摘 | Teichmann KD Teichmann IAM | 1997 | J Cataract Refract Surg1997，23，3： | 1 |
| 20 | A rectifying diode with hysteresis effect from an electroactive hybrid of carbazole-functionalized polystyrene with CdTe nanocrystals via electrostatic interaction显示文摘One of the strategies to tune current-voltage behaviors in organic diodes is to combine field-induced charge transfer processes with schottky barrier.According to this principle,a rectifying diode with hysteresis effect was fabricated utilizing a hybrid of electroactive polystyrene derivative covalently tethered with electron-donor carbazole moieties and electrostatic linked with electron-acceptor CdTe nanocrystals.Current-voltage characteristics show an electrical switching behavior with some hysteresis is only observed under a negative bias,with three orders of On/Off current ratio.The hybrid material based rectifier exhibits a rectification ratio of six and its maximum rectified output current is about 5 × 10-5 A.The asymmetric switching is interpreted as the result of both field induced charge transfer and schottky barrier,capable of reducing the misreading of cross-bar memory.Meanwhile,chemical doping of CdTe nanocrystals instead of physical blend favor their uniform dispersion in matrix and stable operation of device. | LIU JuQing1,QI XiaoYing2,JIANG Ting1,LIN ZongQiong1,CHEN ShuFen1,XIE LingHai1*,FAN QuLi1,LING QiDan1,ZHANG Hua2 & HUANG Wei1* 1Key Laboratory for Organic Electronics & Information Displays(KLOEID) and Institute of Advanced Materials(IAM),Nanjing University of Posts and Telecommunications,Nanjing 210046,China 2School of Materials Science and Engineering,Nanyang Technological University,Singapore 639798,Singapore | 2010 | Science China Chemistry2010，53，11： | 1 |
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