Electrospun Polymer-Fiber Solar Cell

A novel electrospun polymer-fiber solar cell was synthesized by electrospinning a 1 : 2.5 weight% ratio mixture of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) resulting in bulk heterojunctions. Electrospinning is introduced as a technique that may increase polymer solar cell efficiency, and a list of advantages of the technique applied to solar cells is discussed. The device achieved a power conversion efficiency of η = 3.08 x 10-7%. The absorption and photoluminescence of MEH-PPV nanofibers are compared to thin films of the same material. Electrospun nanofibers are discussed as a favorable structure for application in polymer solar cells

ELECTROSPUN POLYMER-FIBER SOLAR CELL

A study of fabricating the first electrospun polymer-fiber solar cell with MEHPPV is presented. Motivation for the work and a brief history of solar cell is given. Limiting factors to improvement of polymer solar cell efficiency are illustrated. Electrospinning is introduced as a technique that may increase polymer solar cell efficiency, and a list of advantages in the technique applied to solar cell is discussed. Results of electrospun polymer-fiber solar cell, absorption, and its device parameter diagnosis through an equivalent circuit analysis are presented

Innovative Micro- and Nanostructured Materials and Devices for Energy Applications

1 Dipartimento di Ingegneria Elettrica e dell'Informazione (DEI), Politecnico di Bari, Via E. Orabona 4, 70125 Bari, Italy 2 Consiglio Nazionale delle Ricerche-Istituto di Fotonica e Nanotecnologie (CNRIFN), Via alla Cascata 56/C, 38123 Trento, Italy 3 Istituto Italiano di Tecnologia (IIT), Center for Biomolecular Nanotechnologies (CBN), Via Barsanti 1, 73010 Arnesano, Italy 4Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, Kharagpur 721302, Indi

Electrospun Polymer Fiber Lasers for Applications in Vapor Sensing

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/138331/1/adom201700248_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/138331/2/adom201700248.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/138331/3/adom201700248-sup-0001-S1.pd

Electrospun Polymer-Fiber Solar Cell

A novel electrospun polymer-fiber solar cell was synthesized by electrospinning a 1 : 2.5 weight% ratio mixture of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) resulting in bulk heterojunctions. Electrospinning is introduced as a technique that may increase polymer solar cell efficiency, and a list of advantages of the technique applied to solar cells is discussed. The device achieved a power conversion efficiency of %. The absorption and photoluminescence of MEH-PPV nanofibers are compared to thin films of the same material. Electrospun nanofibers are discussed as a favorable structure for application in polymer solar cells

静電紡糸法によるポリマー短繊維の合成および繊維長の制御

広島大学(Hiroshima University)博士(工学)Doctor of Engineering in Chemical Engineeringdoctora

Dye-Doped Polymeric Lasers for Sensing Applications

The topic of this thesis is polymeric lasers and their applications in optical sensing. The first part is about whispering gallery mode lasers and presents different approaches how their sensitivity can be enhanced leading to an improved detection limit. The second part focusses on dye-doped electrospun polymer fiber networks with lasing emission and demonstrates possible sensing applications of these structures

A comparison of fiber mat thickness measurement techniques using laser interferometry and water displacement

Polymer fiber mats may often be very thin which leads to complications in measuring thickness. The thickness of fiber mats, however, is crucial in understanding their behavior. Thickness affects how well the mat works as a filter as well as the pressure drop across the mat, and herein lies the need for accurate measurement techniques. Currently two of the available techniques for measuring mat thickness are by laser interferometry[1] and by buoyancy force when submerged in water[2]. Instead of measuring the buoyancy force in this experiment, an enclosure intended to measure the thickness via water displacement was fabricated. A glass slide that has had a fiber mat spun onto it is placed into a dish with the fiber mat facing down, and the water displacement is recorded. The goal of this project is to identify and quantify the difference – or lack thereof – between laser interferometry and water displacement measurement techniques. Polyvinylidene difluoride (PVDF) was chosen for its high hydrophobicity, and fiber mats of varying basis weights were produced via electrospinning. Then the thicknesses were to be obtained with both methods of measurement. Repeat tests were to be run to observe variance within and between the groupings. The expected result of this experiment is that the difference between the two measurement techniques will be statistically insignificant. Unfortunately, due to circumstances surrounding Covid-19, the tests were not possible to be run. [1] (Zhou, et al., 2019) [2] (Samaha, Tafreshi, & Gad-el-Hak, 2013

Nanoparticle-doped electrospun fiber random lasers with spatially extended light modes

Complex assemblies of light-emitting polymer nanofibers with molecular materials exhibiting optical gain can lead to important advance to amorphous photonics and to random laser science and devices. In disordered mats of nanofibers, multiple scattering and waveguiding might interplay to determine localization or spreading of optical modes as well as correlation effects. Here we study electrospun fibers embedding a lasing fluorene-carbazole-fluorene molecule and doped with titania nanoparticles, which exhibit random lasing with sub-nm spectral width and threshold of about 9 mJ cm^-2 for the absorbed excitation fluence. We focus on the spatial and spectral behavior of optical modes in the disordered and non-woven networks, finding evidence for the presence of modes with very large spatial extent, up to the 100 micrometer-scale. These findings suggest emission coupling into integrated nanofiber transmission channels as effective mechanism for enhancing spectral selectivity in random lasers and correlations of light modes in the complex and disordered material.Comment: 22 pages, 6 figure