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- 저자 : Demadrille, Renaud (검색결과 3 건)
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Choi, Seung‐,Hoon,Hwang, Daesub,Kim, Dong‐,Young,Kervella, Yann,Maldivi, Pascale,Jang, Sung‐,Yeon,Demadrille, Renaud,Kim, Il‐,Doo WILEY‐VCH Verlag 2013 Advanced Functional Materials Vol.23 No.25
<P>Highly porous amorphous Zn<SUB>2</SUB>SnO<SUB>4</SUB> electrodes are prepared using electrospinning techniques and combined with organic or ruthenium dyes to fabricate dye‐sensitized solar cells. As reported by Sung‐Yeon Jang, Renaud Demadrille, Il‐Doo Kim, and co‐workers on page 3146, the devices based on 3‐μm‐thick electrodes and the organic dyes demonstrate significantly improved performances compared to those using the ruthenium complex. Using this approach, solar cells with power conversion efficiencies up to 3.7% are obtained. </P>
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Choi, Seung-Hoon,Jang, Bong-Hoon,Park, Jin-Seong,Demadrille, Renaud,Tuller, Harry L.,Kim, Il-Doo American Chemical Society 2014 ACS NANO Vol.8 No.3
<P>Field effect transistors (FETs), incorporating metal-oxide nanofibers as the active conductive channel, have the potential for driving the widespread application of nanowire or nanofiber FETs-based electronics. Here we report on low voltage FETs with integrated electrospun In<SUB>2</SUB>O<SUB>3</SUB>–ZnO–ZnGa<SUB>2</SUB>O<SUB>4</SUB> composite fiber channel layers and high-K dielectric (MgO)<SUB>0.3</SUB>-(Bi<SUB>1.5</SUB>Zn<SUB>1.0</SUB>Nb<SUB>1.5</SUB>O<SUB>7</SUB>)<SUB>0.7</SUB> gate insulator and compare their performance against FETs utilizing conductive single phase, polycrystalline ZnO or In<SUB>2</SUB>O<SUB>3</SUB> channel layers. The polycrystalline In<SUB>2</SUB>O<SUB>3</SUB>–ZnO–ZnGa<SUB>2</SUB>O<SUB>4</SUB> composite fibers provide superior performance with high field effect mobility (∼7.04 cm<SUP>2</SUP>V<SUP>–1</SUP>s<SUP>–1</SUP>), low subthreshold swing (390 mV/dec), and low threshold voltage (1.0 V) combined with excellent saturation, likely resulting from the effective blocking of high current-flow through the In<SUB>2</SUB>O<SUB>3</SUB> and ZnO nanocrystallites by the insulating spinel ZnGa<SUB>2</SUB>O<SUB>4</SUB> phase. The microstructural evolution of the individual In<SUB>2</SUB>O<SUB>3</SUB>, ZnO, and ZnGa<SUB>2</SUB>O<SUB>4</SUB> phases in composite fibers is clearly observed by high resolution TEM. A systematic examination of channel area coverage, ranging from single fiber to over 90% coverage, demonstrates that low coverage results in relatively low current outputs and reduced reproducibility which we attribute to the difficulty in positioning fibers and fiber length control. On the other hand, those with ∼80% coverage exhibited high field effect mobility, high on/off current ratios (>10<SUP>5</SUP>), and negligible hysteresis following 15 sweep voltage cycles. A special feature of this work is the application of the FETs to modulate the properties of complex polycrystalline nanocomposite channels.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-3/nn405769j/production/images/medium/nn-2013-05769j_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn405769j'>ACS Electronic Supporting Info</A></P>
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Electrospun materials for solar energy conversion: innovations and trends
Joly, Damien,Jung, Ji-Won,Kim, Il-Doo,Demadrille, Renaud The Royal Society of Chemistry 2016 Journal of Materials Chemistry C Vol.4 No.43
<▼1><P>This feature article discusses the highly promising and versatile electrospinning methods and electrospun materials employed for the fabrication of solar cells.</P></▼1><▼2><P>This feature article discusses the highly promising and versatile electrospinning methods and electrospun materials employed for the fabrication of solar cells. Electrospinning is attractive for creating one dimensional mesostructured organic, inorganic and hybrid nanomaterials of controlled dimensions, prepared as random or oriented continuous nanofibers (NFs), with possibilities of ordered internal morphologies such as core–sheath, hollow or porous fibres, or even multichanneled microtube arrangements. The dimensionality, directionality and compositional flexibility of electrospun NFs and mats are increasingly being investigated for the targeted development of electrode and electrolyte materials, where the specific properties associated with nanoscale features such as high surface areas and aspect ratios, low density and high pore volume allow performance improvements in solar energy conversion devices.</P></▼2>
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