Fabrication and Characterization of Inverted Organic Photovoltaics PDF Download
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Author: Tyler John Perlenfein
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 120
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Adviser: Jason Baxter.
Author: Tyler John Perlenfein
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 120
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Adviser: Jason Baxter.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 142
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Author: Liang Wang
Publisher:
ISBN:
Category : Energy conversion
Languages : en
Pages : 124
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Author: Sri Krishna Domakonda
Publisher:
ISBN:
Category : Hybrid solar cells
Languages : en
Pages : 252
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Author: Emre Yengel
Publisher:
ISBN: 9781124400662
Category : Energy conversion
Languages : en
Pages : 81
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Book Description
Bulk heterojunction organic solar cells have recently drawn tremendous attention because of their technological advantages for actualization of large-area and cost effective fabrication. Two important criteria of these cells are efficiency and cost. The research in this dissertation focuses on the enhancement of these criteria with two different approaches. In the first approach, power conversion efficiency of organic photovoltaic devices is enhanced by introducing Deoxyribonucleic acids DNA into the device structure. DNA provide exciting opportunities as templates in self assembled architectures and functionality in terms of optical and electronic properties. In the first method, we investigate the effects of DNA and metalized DNA sequences in polymer fullerene bulk-heterojunction (BHJ) solar cells. These effects are characterized via optical, quantum efficiency and current-voltage measurements. We demonstrate that by placing on the hole collection side of the active layer, DNA and Pt-DNA sequences lead to an increase in the power conversion efficiency (PCE) by %16 and %30, respectively. Furthermore, we studied the electrical charge characteristics of our DNA layer by using capacitance-voltage (C-V) measurements to explain the increase in hole collection which shows that spray coated DNA formed a negative layer which can increase the hole collection in the cathode side. In the second approach, device cost is tried to reduce by replacing the most expansive material, indium thin oxide (ITO) thin films, with graphene thin films. Large area graphene films were grown with chemical vapor deposition (CVD) method. It is observed that, its pristine form, the electrical and surface properties of these films are not sufficient enough for the organic photovoltaic applications. These properties are enhanced with a surface treatment of Argon (Ar) plasma and nitric acid bath. The results of these treatments show that the surface becomes hydrophilic and surface resistance can be decreased by %25. Then, it is demonstrated that the PCE of the graphene based solar cells can be reached up to one tenth of the ITO based devices. The research conducted in this dissertation offers promising potential of bulk heterojunction organic solar cells as a clean and affordable source of energy source in the near future.
Author: Pankaj Kumar
Publisher: CRC Press
ISBN: 1498723306
Category : Science
Languages : en
Pages : 338
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This book contains detailed information on the types, structure, fabrication, and characterization of organic solar cells (OSCs). It discusses processes to improve efficiencies and the prevention of degradation in OSCs. It compares the cost-effectiveness of OSCs to those based on crystalline silicon and discusses ways to make OSCs more economical. This book provides a practical guide for the fabrication, processing, and characterization of OSCs and paves the way for further development in OSC technology.
Author: Ruozhu Duan
Publisher:
ISBN:
Category :
Languages : en
Pages : 79
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Book Description
Organic solar cells (OSCs) offer the advantages of low fabrication cost, light weight and flexibility. Current research in this field has focused on increasing the power conversion efficiency (PCE) of organic solar cells beyond 5%, as well as improving long term stability and further reducing the fabrication cost. Key issues related to OSC technology include improving the processes of dissociation of photo induced excitons (bound electron-hole pairs), reducing charge recombination and transport losses, and better utilization of the sunlight spectrum. This project represents an effort to assess the feasibility of a new type of Photovoltaics (PV) device structure, namely nanodipole photovoltaics, in the case organic semiconducting host materials. The basic principle of nanodipole PV is based on the idea that the electric field of nanoparticles with uncompensated electric dipoles, which are dispersed in a photoconductor host material, can be used to replace the built-in electric field of p-n or other junctions in conventional PV devices. Thus, nanodipole PV devices can be considered junctionless and they employ active media that are comprised of nanocomposite materials. As part of the project, a process for the fabrication of P3HT:PCBM bulk-heterojunction (BH) solar cell structures was developed, following published information on the topic. As a next step, processes for the fabrication of nanocomposites of P3HT and P3HT: PCBM with commercially acquired nanoparticles of ZnO and BaTiO3 were developed. Thin film of these nanocomposites with various nanoparticles loading levels were fabricated by spin coating on glass and conducting transparent glass substrates. Metal back contacts were deposited to form back contacts for electrical and PV characterization. The films were also characterized by X-ray diffraction, scanning electron microscopy and spectrophotometry and a study on external-voltage nanodipole alignment in P3HT: ZnO composites were performed. The main results from the project can be summarized in the following. Basic BH P3HT: PCBM device structures, fabricated as a result of this work, showed typical PCE values of 0.9% or slightly above, which is considered adequate for the purposes of this project and in view of equipment and other limitations faced. The introduction of BaTiO3 nanoparticles in P3HT: PCBM did not produce any changes or effects that can be interpreted in terms of nanodipoles electric field and nanodipole PV action. This was most likely due to the fact that the particles had cubic crystalline structure, which is non-ferroelectric and therefore the particles dipole moments were very weak or nonexistent. The introduction of ZnO in P3HT at a concentration that was low enough to guarantee that hybrid BH solar cell devices did not form (i.e., volume concentration of up to 5%), showed an effect in the PV current-voltage characteristics, which was attributed to the existence of nanodipoles and their field.
Author: David Müller
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Man Keung Wong
Publisher:
ISBN:
Category : Nanostructured materials
Languages : en
Pages : 150
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Author: 董勁吾
Publisher:
ISBN:
Category :
Languages : en
Pages : 57
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