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Comparison between P25 and anatase-based TiO_2 quasi-solid state dye sensitized solar cells

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Chinese Science Bulletin 2008年第6期53卷 954-957页

作者： LUO Fen wang liduo QIU Yong Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education Tsinghua University Beijing 100084China

Pure anatase TiO2 films have been made via hydration of titanium isopropoxide using a sol-gel tech- nique, while mixed TiO2 films which contained both anatase and rutile TiO2 were made from commercial P25 powder. Quasi-solid state dye-sensitized solar cells were fabricated with these two kinds of mesoporous films and a comparison study was carried out. The result showed that the open-circuit photovoltages (Voc) for both kinds of cells were essentially the same, whereas the short-circuit photo- currents (Isc) of the anatase-based cells were about 33% higher than that of the P25-based cells. The highest photocurrent intensity of the anatase-based cell was 6.12 mA/cm2 and that of the P25-based cell was 4.60 mA/cm2. Under an illumination with the light intensity of 30 mW/cm2, the corresponding en- ergy conversion efficiency was measured to be 7.07% and 6.89% for anatase-based cells and P25-based cells, respectively.

关键词：太阳能电池锐钛矿二氧化钛光电流

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Organic optocouplers

Science China Chemistry 2011年第7期54卷 1017-1026页

作者： SUN QiuJian DONG GuiFang wang liduo QIU Yong Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China

Organic optocoupler(OOC) or organic photocoupler,optical coupler is a novel and one of the most promising organic optoelectronic devices for its well electrical isolation and anti-jamming ability in long-distance and real-time digital *** performance parameters of OOC were greatly raised during the past decade,and its development was strongly associated with basic organic devices such as organic light emitting diodes(OLED),organic photodiodes(OPD) and organic phototransistors(OPT) *** we describe the principles of OOC,review recent breakthroughs in this field,and summarize the photosensor and light emitting parts which could be used in the *** technical points,such as current transfer ratio,frequency,matching and stability were also discussed in this paper.

关键词： organic optocoupler organic photocoupler photodiodes phototransistors light emitting diode current transfer ratio cut-off frequency

Solution-Processed Graphene Composite Films as Freestanding Platinum-Free Counter Electrodes for Bendable Dye Sensitized Solar Cells

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Chinese Journal of Chemistry 2016年第1期34卷 59-66页

作者： Qinqin Zhou Shan Chen Miao Zhang liduo wang Yingru Li Gaoquan Shi Department of Chemistry Tsinghua University Beijing 100084 China

Sulfuric acid-treated poly（3,4-ethylenedioxythiophene）：poly（styrenesulfonate）/less-defective reduced graphene oxide （ST-PEDOT：PSS/L-rGO） composite films were prepared via a solution-processing route and used as the counter electrodes of dye sensitized solar cells （DSSCs）. These platinum （Pt）- and transparent conductive oxide （TCO）-free counter electrodes exhibited strong catalytic activity and excellent flexibility, showing no obvious change in their sheet resistances after 10000 cycles of bending. The integrated quasi-solid-state DSSC device with a TiO2 nanotube/Ti mesh photoanode and a ST-PEDOT：PSS/L-rGO counter electrode exhibited an energy conversion efficiency （~/） of about 1.8%. It also displayed an excellent mechanical stability and durability after bending for 1000 cycles at a small curvature radius of 10 mm. The high flexibility, low cost and efficient catalytic activity make ST-PEDOT：PSS/L-rGO composite films promising counter electrodes for flexible DSSCs.

关键词： graphene polymers counter electrode dye sensitized solar cell

Preparation and spectral characteristics of anthracene/tetracene mixed crystals

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Science China Chemistry 2009年第2期52卷 181-187页

作者： LI HuiPing DUAN Lian ZHANG DeQiang DONG GuiFang wang liduo QIU Yong Key Lab of Organic Optoelectronics&Molecular Engineering of Ministry of Education Department of ChemistryTsinghua Univer-sityBeijing 100084China

A series of tetracene-doped anthracene crystals with different doping concentrations(the highest mo-lar ratio 100:1) are grown from *** structures and optical characteristics of the above mixed crystals are investigated at room *** changing the doping concentrations,the fluorescence can be adjusted from blue-green to green and even to *** emission spectra of anthracene/tetracene(An/Te) mixed crystals reveal the sensitized fluorescence of tetracene and the partial quenching of anthracene *** data of transient photoluminescence(PL) decays illus-trate that in An/Te mixed crystals,the decay of anthracene becomes faster,while the PL lifetime of tet-racene is longer than that of the tetracene single *** above experimental results suggest that there is excitation energy transfer from anthracene to tetracene in the mixed crystals.

关键词： anthracene tetracene organic mixed crystals fluorescence spectrum energy transfer

Synthesis and characterization of nano/microstructured crystalline germanium dioxide with novel morphology

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Chinese Science Bulletin 2009年第16期54卷 2810-2813页

作者： wang XiaoYan DUAN Lian DONG GuiFang WEI Peng wang Wei wang liduo QIU Yong Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua University Beijing 100084 China

Nano/micro-structured germanium oxide (GeO2) was prepared using GeCl4 and KOH by a simple solution method in alkalic alcoholic solution. Different morphologies of GeO2 were obtained by changing the reaction conditions. The effects of the reaction time, the concentration of the reactants, the reaction temperature and the dispersant upon the morphology of the deposited GeO2 have been investigated. The products were detected by X-ray diffraction (XRD), atomic force microscope (AFM), scanning electron microscope (SEM) and transmission electron microscope (TEM). Novel cross-like structures were obtained by using n-butylamine as the dispersant. The formation of the cross-like structures has been discussed and a solution-liquid-solid (SLS) mechanism was proposed.

关键词：二氧化锗分散形态微结构透射电子显微镜扫描电子显微镜表征合成结晶

Preparation of organic thin-film field effect transistor

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Chinese Science Bulletin 2002年第18期47卷 1529-1532页

作者： Yong Qiu Yuanchuan Hu Guifang Dong liduo wang Yudi Gao Tsing Hua Univ Dept Chem Beijing 100084 Peoples R China

The organic thin-film field effect transistor was prepared through vacuum deposition by using teflon as dielectric material. Indium-tin-oxide acted as the source and drain electrodes. Copper phthalocyanine and teflon were used as the semiconductor layer and dielectric layer, respectively. The gate electrode was made of Ag. The channel length between the source and drain was 50μm. After preparing the source and drain electrodes by lithography, the copper phthalocyanine layer, teflon layer and Ag layer were prepared by vacuum deposition sequentially. The field effect electron mobility of the device reached 1.1×10-6 cm2/(V·s), and the on/off current ratio reached 500.

关键词： organic thin-film transistor copper phthalocyanine teflon.

New hybrid encapsulation for flexible organic light-emitting devices on plastic substrates

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Chinese Science Bulletin 2008年第6期53卷 958-960页

作者： LIU Song ZHANG DeQiang LI Yang DUAN Lian DONG GuiFang wang liduo QIU Yong Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education Tsinghua University Beijing 100084China

The hybrid encapsulation for flexible organic light-emitting devices on plastic substrate was investi- gated. The hybrid encapsulation consisted of four periods of Alq3/LiF layers as the pre-encapsulation layer and a flexible aluminum foil coated with getter as the encapsulation cap. We measured the device lifetime at a continuous constant current of 20 mA/cm2, which corresponded to an initial luminance of 2000 cd/m2. The half-luminance decay time of the encapsulated device was about 458 h. More over, the hybrid encapsulation is ultrathin and flexible, ensuring device bendability.

关键词：有机发光设备可变形显示器混合包装使用寿命

Bipolar charge transport property of N,N'-dicarbazolyl1,4-dimethene-benzene:A study of the short range order model

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Chinese Science Bulletin 2013年第1期58卷 79-83页

作者： LI HaoYuan CHEN Liang QIAO Juan DUAN Lian DONG GuiFang wang liduo QIU Yong Key Labaratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education Department of ChemistryTsinghua University

Short range order model is commonly used to explain the charge transport property of disordered organic ***,its validity is not yet *** this paper,the hole and electron mobilities of a bipolar material,N,N'-dicarbazolyl-1,4dimethene-benzene(DCB),were measured through time of flight *** hole and electron mobilities of DCB based on the crystalline structure were *** order to investigate the short range order model,the ratios of charge mobilities at zero electric field of holes to electrons were *** results showed that this model cannot fully explain our *** reason was discussed in detail,and a correction method was *** showed that using the short range order model without preconditions to explain the charge transport property of amorphous materials may lead to deviations,which is often neglected in the past.

关键词：有序模型传输性能电荷短程双极苯有机半导体飞行时间法

Experimental and theoretical study of the charge transport property of 4,4′-N,N′-dicarbazole-biphenyl

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Science China Chemistry 2012年第11期55卷 2428-2432页

作者： LI HaoYuan CHEN Liang QIAO Juan DUAN Lian ZHANG DeQiang DONG GuiFang wang liduo QIU Yong Key Laboratory of Organic Optoelectronics&Molecular Engineering of Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China

The hole and electron mobilities of the amorphous films of the organic semiconductor 4,4′-N,N′-dicarbazole-biphenyl (CBP) at different electric fields were measured through the time of flight (TOF) method. Based on its crystalline structure, the hole and electron mobilities of CBP were calculated. A detailed comparison between experimental and theoretical results is necessary for further understanding its charge transport properties. In order to do this, charge mobilities at zero electric field, μ(0), were deduced from experimental data as a link between experimental and theoretical data. It was found that the electron transport of CBP is less affected by traps compared with its hole transport. This unusual phenomenon can be understood through the distributions of frontier molecular orbitals. We showed that designing materials with frontier molecular orbitals localized at the center of the molecule has the potency to reduce the influence of traps on charge transport and provide new insights into designing high mobility charge transport materials.

关键词： CBP organic semiconductors charge mobility time of flight method quantum chemical calculation electron transport