Inverted organic solar cell applications of benzodithiophene and benzotriazole bearing alternating copolymers

Bolayır, Eda
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 and acceptor units. Electrochemical studies revealed that both polymers have ambipolar character. Cyclic voltammetry analysis were carried out to calculate HOMO and LUMO energy levels of polymer P1 and P2. Inverted organic photovoltaic applications of polymers were constructed as following ITO / ZnO / POLYMER:PC71BM / MoO3 / Ag. The J-V measurements of the photovoltaic devices were performed under the standard AM 1.5G illumination. AFM and TEM techniques were used in order to examine thickness and morphology of the polymer films. As a result of several optimization studies, power conversion efficiencies were achieved as 1.30% for P1 and 1.02% for P2, respectively.


Benzodithiophene and benzotriazole bearing alternating copolymers, effect of thiophene and bithiophene _-bridges on photovoltaic properties
İstanbulluoğlu, Çağla; Toppare, Levent Kamil; Department of Chemistry (2016)
In this study, two novel 1,2,3-benzotriazole and benzodithiophene bearing alternating copolymers were synthesized via Stille coupling reaction. Benzodithiophene was used as the donor moiety due to its strong electron donating ability and planar structure. Benzotriazole moiety was incorporated as the acceptor unit due to its electron deficient nature. Moreover, thiophene (P1) and bithiophene (P2) conjugated moieties were incorporated between donor and acceptor units in order to investigate the effect of π-br...
Synthesis of new conjugated donor-acceptor type polymers for photovoltaic device applications
Akpınar, Hava Zekiye; Toppare, Levent Kamil; Özkan, Necati; Department of Polymer Science and Technology (2015)
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 co...
Imaging solar cells using terahertz waves
Kayra, Seda; Altan, Hakan; Department of Physics (2011)
In this thesis, Terahertz Time-Domain spectroscopy (THz-TDS) was used in order to measure the electrical properties of silicon solar cells. The advantage of THz-TDS is that it allows us to measure the electrical properties without electrical contacts. In order to perform these measurements, a reflection based system was constructed and the changes in the peak amplitude in the time-domain under a, 450mW 808 nm continuous wave laser source were measured. The solar cell that was used in this thesis was manufac...
Synthesis and characterization of novel quinoxalinebased and thieno[3,4-c]pyrrole-4,6-dione-based conjugated polymers and their applications in organic electronics
Karabağ, Aliekber; Günbaş, Emrullah Görkem; Department of Polymer Science and Technology (2017)
In this thesis novel quinoxaline-based and thieno[3,4-c]pyrrole-4,6-dione (TPD)- based monomers were firstly synthesized. Structural analysis of each material synthesized was performed with Nuclear Magnetic Resonance (NMR) Spectroscopy and High-Resolution Mass Spectroscopy (HRMS). Two novel quinoxaline-based monomers were polymerized with electrochemical and/or chemical polymerization whereas TPD-based monomer was polymerized with benzodithiophene-based acceptor via Stille coupling polycondensation reaction...
Polymer light emitting diodes and organic solar cells towards ito free devices and high efficiency devices using electrochemically synthesized polymers /
Hızalan Özsoy, Gönül; Toppare, Levent Kamil; Department of Chemistry (2017)
In this study, polymer based solar cells and polymer based light emitting diodes were constructed. In the third and fourth chapters of this study, effect of terminal units and effect of molecular weight on electroluminescence and photovoltaic properties were investigated. Triphenyl end capped polymer P1 based PLED shows luminance value of 10411cd/m2 at 8.5V whereas benzene end capped polymer P2 based PLED has the peak luminance value of 14583cd/m2 at 8V. P2 based photovoltaic devices exhibited superior perf...
Citation Formats
E. Bolayır, “Inverted organic solar cell applications of benzodithiophene and benzotriazole bearing alternating copolymers,” M.S. - Master of Science, Middle East Technical University, 2018.