Design, syntheses and structure-property relationships of benzazole and isoindigo comprising conducting polymers/

Download

index.pdf

Date

2019

Author

Göker, Seza

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

69
views

59
downloads

Donor–acceptor (D–A) conjugated polymers have been widely used for potential applications such as organic light emitting diodes, solar cells, electrochromic devices and organic field effect transistors. Benzazole comprising conducting polymers are popular for the last few decades since they can be used as low-band-gap donor materials because of their strong intramolecular charge transfer characteristics and excellent photovoltaic performances. Strong electron-donating and withdrawing building blocks are necessary to lower the band gaps and HOMO energy levels of D–A polymers. Alkoxy substitution to the acceptor groups provides polymers better solubility and higher molecular weight whereas fluorine substitution increases the strength of the acceptors via lowering electron density. In this thesis, 2,1,3-benzazole moieties were substituted with alkoxy and fluorine groups. Benzazole and isoindigo were coupled with several donor groups via both Stille and Suzuki polycondensation reactions to investigate structure-property relationships. On the other hand, Direct Heteroarylation Polymerization (DHAP) was also performed to obtain new polymers via an eco-friendly method. Molecular weights of polymers were investigated with GPC analysis. Oxidation and reduction behavior of the polymers were conducted using cyclic voltammetry. Polymers were used as active layers in optoelectronic applications. The effect of thermal and solvent annealing on morphology were determined. After optimizing thickness and morphologies of polymer:PCBM, device production and current/voltage property measurements were performed in a nitrogen filled glove box system. The analysis of the photovoltaic devices ITO/ PEDOT:PSS/Polymer: PCBM/ Metal) were achieved by means of the energy conversion efficiency measured under standard AM 1.5G illumination.

Subject Keywords

Isoindole., Donor-Acceptor Approach, Benzazole, Isoindigo, Conducting Polymers, Photovoltaic

URI

http://etd.lib.metu.edu.tr/upload/12624349/index.pdf
https://hdl.handle.net/11511/45155

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Synthesis, electrochemical characterization and organic solar cell applications of selenophene containing conjugated polymers Yaşa, Mustafa; Toppare, Levent Kamil; Department of Polymer Science and Technology (2017) Donor-Acceptor (D-A) type conjugated polymers are very popular for potential applications such as organic light emitting diodes, solar cells, electrochromic devices and organic field effect transistors. In literature, cyclopentadithiophene and its derivatives are commonly used electron donor units for organic solar cells. The incorporation of selenium atom into polymer backbone results in low band gap polymers as compared to sulfur and oxygen counterparts. In this study, selenophene containing conjugated po...
Synthesis of novel diketopyrrole and selenophene containing nir absorbing polymers and their application in bulk-heterojunction solar cells Öklem, Gülce; Günbaş, Emrullah Görkem; Department of Polymer Science and Technology (2017) DPP-based conjugated polymers are recently used in organic light emitting diodes, electrochromic devices, organic field effect transistor and organic solar cell applications. Their advantageous properties, such as broad optical absorption in Near Infra Red (NIR) region, high charge carrier mobility and good film forming ability make them an excellent choice for generation of highly efficient solar cells. In this thesis, using donor-acceptor approach (D-A) we aimed to synthesize novel polymers with furan bas...
Development of AZO TCOs with ALD for HEMT and HJSC Solar Cell Applications Tugrul, Deniz; Cakmak, Huseyin; Özbay, Ekmel; İmer, Muhsine Bilge (2021-12-01) Transparent Conductive Oxide (TCO) films are widely used in optoelectronic devices, such as solar cells, LEDs, and Lasers. Utilization of these contacts directly affects the device efficiencies. Purpose of this study is to produce and optimize properties of Aluminum doped Zinc Oxide (AZO) using a vapor phase technique, Atomic Layer Deposition (ALD) for (n+) a-Si:H surface of silicon Heterojunction Solar Cells (HJSCs) and High Electron Mobility Transistor (HEMT) applications. This study is focused on the eff...
Development of AZO TCOs with ALD for HEMT and HJSC solar cell applications Tugrul, Deniz; Cakmak, Huseyin; Özbay, Ekmel; İmer, Muhsine Bilge (2020-10-04) Transparent Conductive Oxide (TCO) films are widely used in optoelectronic devices, such as solar cells, LEDs, and Lasers. Utilization of these contacts directly affects the device efficiencies. These films can be produced with solid, liquid and vapor phase deposition techniques. Generally, metal oxides such as CdO, In2O3, SnO2, Ga2O3 and ZnO can be used in these structures as intrinsic or extrinsic semiconductors. Purpose of this study is to reproduce widely studied Aluminium doped Zinc Oxide (AZO) using a...
Design, synthesis and characterization of 2,1,3-benzothiadiazole comprising polymers: the effect of bridging units on the optoelectronic properties and opv device construction Zeytun Karaman, Cansu; Toppare, Levent Kamil; Özçubukçu, Salih; Department of Chemistry (2021-2-10) Recently, conjugated polymers have obtained increasing popularity in a wide range of application areas such as electrochromic (EC) devices, biosensors, organic solar cells (OPVs) and organic light-emitting diodes (OLEDs). This popularity results from ease of processability, a good charge transporting capability, and broad optical absorption ability of the conjugated polymers. 2,1,3 benzothiadiazole has been commonly used in D-A type conjugated polymers since it is one of the strongest acceptor groups result...

Citation Formats

S. Göker, “Design, syntheses and structure-property relationships of benzazole and isoindigo comprising conducting polymers/,” Thesis (Ph.D.) -- Graduate School of Natural and Applied Sciences. Chemistry., Middle East Technical University, 2019.