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A Facile Photo-cross-linking Method for Polymer Gate Dielectrics and Their Applications in Fully solution processed Low Voltage Organic Field-effect Transistors on Plastic Substrate

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Chinese Journal of Polymer Science 2018年第8期36卷 918-924页

作者： Ying Liu Jia-Qing Zhao Wen-Jian Sun Yu-Kun Huang Su-Jie Chen Xiao-Jun Guo Qing Zhang Shanghai Key Laboratory of Electrical Insulation and Thermal Aging Department of Polymer Science and EngineeringSchool of Chemistry and Chemical EngineeringShanghai Jiao Tong University Department of Electronic Engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong University

A simple and effective photochemical method was developed for cross-linking of polymer gate dielectrics. Laborious synthetic processes for functionalizing polymer dielectrics with photo-cross-linkable groups were avoided. The photo-cross-linker, BBP-4, was added into host polymers by simple solution blending process, which was capable of abstracting hydrogen atoms from polymers containing active C--H groups upon exposure to ultraviolet （UV） radiation. The cross-linking can be completed with a relatively long wavelength UV light （365 nm）. The approach has been applied to methacrylate and styrenic polymers such as commercial poly（methylmethacrylate）（PMMA）, poly（iso-butylmethacrylate）（PiBMA） and poly（4-methylstyrene）（PMS）. The cross-linked networks enhanced dielectric properties and solvent resistance of the thin films. The bottom-gate organic field-effect transistors （OFETs） through all solution processes on plastic substrate were fabricated. The OFET devices showed low voltage operation and steep subthreshold swing at relatively small gate dielectric capacitance.

关键词： Organic field-effect transistors solution processed Polymer dielectric Cross-linking Photochemistry

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Stable and low-cost solution processed perovsktie solar cells using a PTFE buffer layer

Stable and low-cost solution processed perovsktie solar cell...

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第二届新型太阳能电池学术研讨会

作者： Yang Dang Panpan Zhang Bonan Kang State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University

Organometal halide perovskite solar cells have achieved high power conversion efficiency(PCE) value of 6% using TiO-based structure[1]. The high performance is due to the strong light absorption, weak exciton binding energy and long hole-electron diffusion length[2,3]. In the TiO-based perovskite solar cells, the compact TiO layer requires high temperature treatment about 450℃. However, high temperature process is not suitable for flexible substrates or ITO substrates. The solution processed perovskite solar cells have attracted great attention for their low temperature treatment, low cost and flexibility. The latest reported PCEs of solution processed perovskite solar cells have been over 14%[4]. There is considerable spaces for further enhancement of devices efficiency by optimizing the perovskite film morphologies and device architectures. Here, we fabricated a solution processed perovskite solar cells using PTFE as a buffer layer. The CHNHPbICl layer was used as light absorber in the solar cells. A thin film of PTFE was evaporated on the top of ITO substrate. The open-circuit voltage and efficiency have significantly increased by introducing PTFE layer. The PCE was 7.81%, with an open-circuit voltage of 0.83 V, a short current density of 17.93 mA/cm, and fill factor of 52.48%. The performance will be optimized in our future work.

关键词： solution processed low temperature perovskite solar cells PTFE buffer layer

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A Three-dimensional Non-fullerene Small Molecule Acceptor for solution-processed Organic Solar Cellst

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Chinese Journal of Chemistry 2017年第11期35卷 1687-1692页

作者： Meijia Chang Yunchuang Wang Nailiang Qiu Yuan-Qiu-Qiang Yi Xiangjian Wan Chenxi Li Yongshen Chen State Key Laboratory of Elemento-Organic Chemistry Centre of Nanoscale Science and Technology andKey La- boratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 China

An acceptor-donor-acceptor （A-D-A） three-dimensional （3D） small molecule acceptor （SFTTIC）, using spiro- bifluorene as the core unit linking with four thieno[3,2-b]thiophenes （TT） and end-capped with 2-（3-oxo-2,3-dihy- dro-lH-inden-l-ylidene）malononitrile （INCN） was developed for solution processed organic solar cells. SFTTIC has a high absorption coefficient up to 3.12 × 105 mol-1,cm-1, good thermal stability and appropriate energy levels. The optimized power conversion efficiency （PCE） of 5.66% and 4.65% was achieved for the devices with PBDB-T：SFTTIC and PTB7-Th：SFTTIC, respectively.

关键词： organic solar cells non-fullerene acceptor solution processed three-dimensional structure

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High performance solution processed planar heterojunction perovskite solar cells

High performance solution processed planar heterojunction pe...

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第一届新型太阳能电池暨钙钛矿太阳能电池学术研讨会

作者： Xichang Bao Renqiang Yang Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences

Organometal halide perovskite is an ideal photovoltaic material that exhibits a direct optical bandgap(1.5 eV), a long diffusion length, a broad range of light absorption covering the visible to near infrared spectrum. Most importantly, organo-lead halide perovskites behave the ambipolar characteristics and work very well with organic carrier transport materials [1]. They have been applied as active layer in both mesoporous structure and planar heterojunction solar cells with the highest demonstrated power conversion efficiency(PCE) exceeding 15% [2,3]. Moreover, solution processed low cost, high efficiency photovoltaic devices have been persistently pursued in the past decade for renewable solar to electric energy conversion. Recently, low temperature solution processed planar structure perovskite solar cells attract great attention due to their low cost, easy fabrication, and flexible application. Recently, the PCEs of solution processed perovskite solar cells have been over 12% [4]. That the obvious efficiency losses in solution processed perovskite solar cells can be mainly ascribed to the charge recombination at imperfect interfaces chemical defects in perovskite films [5]. In this abstract, we report a low temperature solution process to form relatively high quality continuous CHNH PbI layer that was used in planar perovskite solar cells(as shown in Fig. 1). Through increasing the weight ratio of CHNHI and PbI from 1:1 to 2:1, the highest performance was obtained at the weight ratio of 1.2:1 and the result was shown in Fig. 2. The PCE was 10.79%, with an open circuit voltage of 0.99 V, a short current density of 18.51 m A/cm, and a fill factor of 58.54%. The work is under optimizing in our group, and we believe that the performance will be further improved soon.

关键词： perovskite solar cell solution processed planar structure low temperature

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High performance flexible metal oxide/silver nanowire based transparent conductive films by a scalable lamination-assisted solution method

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Journal of Materiomics 2017年第1期3卷 77-82页

作者： Hua Yu Andrew J.Stapleton David A.Lewis Lianzhou Wang a Nanomaterials Centre School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandBrisbaneQLD4072Australia Flinders Centre for NanoScale Science and Technology Flinders UniversityGPO Box 2100AdelaideSA 5001Australia CSIRO Materials Science and Engineering Private Bag 33Clayton SouthVictoria 3169Australia

Flexible MoO_(3)/silver nanowire(AgNW)/MoO_(3)/TiO_(2)/Epoxy electrodes with comparable performance to ITO were fabricated by a scalable solution-processed method with lamination assistance for transparent and conductive *** nanoparticle-based electrodes were also prepared for *** a simple spin-coating and lamination-assisted planarization method,a full solution-based approach allows preparation of AgNW-based composite electrodes at temperatures as low as 140℃.The resulting flexible AgNW-based electrodes exhibit higher transmittance of 82%at 550 nm and lower sheet resistance about 12-15Ωsq^(-1),in comparison with the values of 68%and 22-25Ωsq^(-1) separately for AgNP based *** electron microscopy(SEM)and Atomic force microscopy(AFM)reveals that the multi-stacked metal-oxide layers embedded with the AgNWs possess lower surface roughness(solution-processed method is cost-effective and scalable,which is desire for large-area *** in view of the materials cost and comparable performance,this AgNW-based transparent and conductive electrodes is potential as an alternative to ITO for various optoelectronic applications.

关键词： Silver nanowires Transparent conductive film MoO_(3) solution processed Lamination

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