Synthesis of new conjugated donor-acceptor type polymers for photovoltaic device applications

Akpınar, Hava Zekiye
Electrochromism and photoelectric effect are the mostly investigated areas of conducting polymers. In electrochromism, electrochemical parameters of the polymers are firstly examined. Spectroelectrochemical studies are performed with specified wavelengths. Parameters, such as optical contrast and switching times of the polymer films are explored. In bulk heterojunction polymer solar cells, semiconducting polymer materials in combination with fullerene are used as the active layer. Photons are absorbed by conjugated polymer and strongly bounded excitons are formed. In order to efficiently separate the bounded electron hole pairs, HOMO and LUMO levels of the polymer and fullerene should be compatible with each other. The performance of the devices is also highly dependent on the molecular structure of the polymer side chains. In this thesis study, five novel conjugated polymers containing donor-acceptor units such as thiazolothiazole, thiophene, furan, benzotriazole and fluorene were synthesized via Suzuki and Stille coupling polymerizations. Electrochemical and optical properties of the polymers were examined and bulk heterojunction organic photovoltaic devices were fabricated using (C 61) fullerene. Solar cell parameters such as open circuit voltage, short circuit current density, fill factor and power conversion efficiency were measured.


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Fused bithiophene containing conjugated polymers are recently used in different applications; for example organic light emitting diodes, solar cells, electrochromic devices and organic field effect transistors. Fused bithiophene derivatives increase the planarity, charge mobility and decrease band gap when incorporated into the polymer backbone. Connecting atom between the bithiopheneunit can be phosphorous, silicon, nitrogen and sulphur. In this thesis, dihienothiophene was coupled with benzotriazole via S...
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In this thesis, electrochemical, optical and photovoltaic studies of two novel benzodithiophene and 1,2,3-benzotriazole bearing alternating copolymers were investigated. Benzodithiophene which has a strong electron donating ability and planar structure was used as the donor moiety. On the other hand, benzotriazole was used as an acceptor moiety due to its electron deficient nature. In order to determine the effect of л-bridges, thiophene (P1) and selenophene (P2) moieties were incorporated between the donor...
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The use of slotted quartz tube (SQT) as an atom trap in atomic absorption spectrometry (AAS) provides a more stable chemical environment for atomization; the technique is simple and easily applicable in any laboratory. This thesis study involves application of SQT together with some other approaches to thallium determination by AAS. The first stages involve the efforts to improve nebulization efficiency of conventional flame atomic absorption spectrometry (FAAS) with and without the use of SQT. This is achi...
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Akbaşoğlu Ünlü, Naime; Çırpan, Ali; Department of Chemistry (2015)
Donor-acceptor (D-A) approach is highly efficient to obtain p-type and n-type materials with desired intrinsic optical and electrochemical properties. Therefore, in this study a series of p-type and n- type DA type conjugated polymers was synthesized with combination of electron donating and electron-withdrawing heterocyclics to understand the effects of structural modifications on electrochemical, optoelectronic and photovoltaic properties. Synthesized polymers were utilized for electrochromic and organic ...
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Radiation characteristics of infinitesimal dipole in multilayered circular cylindrical structure including gyromagnetic media are investigated. Transversal field equations in spectral domain are obtained for gyromagnetic medium in cylindrical coordinates. These expressions are formed into a set of linear differential equations. The solution at each layer is expressed in terms of state transition matrices. Fields are matched at the interfaces. Far fields are evaluated asymptotically. The effects of changing ...
Citation Formats
H. Z. Akpınar, “Synthesis of new conjugated donor-acceptor type polymers for photovoltaic device applications,” Ph.D. - Doctoral Program, Middle East Technical University, 2015.