Fused conjugated structures for organic electronics

Download

index.pdf

Date

2019

Author

Cevher, Şevki Can

Metadata

Show full item record

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

Item Usage Stats

276
views

160
downloads

In the first application, to investigate the organic light emitting diode device performances three different polymers were synthesized in which fused phenantroimidazole ring was combined with benzotirazole based polymeric backbone. P1 incorporated electroluminescent device exhibited superior performance. The highest luminance efficiency for P1 based device was 3.01 cd/A with a luminance value of 140,180 cd/m2. In the second part, monomer M1 was synthesized and functionalized from ketone (M1) to oxime (M2) and enamine (M3) for laccase based catechol biosensors. Laccase immobilized by crosslinking with glutaraldehyde on bare polymer coated galssy carbon electrode. M1 based electrode exhibited superior performance linear range between 0.005-0.175 mM with detection limit of 9.86 μM without need of any additional support material. In the final part, four similar polymers were synthesized where the effect of chalcogens or effect of electron donating/withdrawing ability of substituents were investigated separately. PO gave the highest power conversion efficiency among others with a value of 4.72 %. Hence preliminary studies of polymers exhibited promising properties for efficient solar cells. Two more polymers were synthesized to enlarge the absorption of conjugated polymers to infrared region. Optical band gaps of polymers were calculated from absorption on set values of 870 and 760 nm as 1.42 and 1.63 eV respectively for PIQBDT and PIQCAR. The last study covered the synthesis of polymeric material, which can covalently bond to plasmonic nanoparticles. In this way morphological distribution of plasmonic nanoparticles could be in close proximity to polymer in solar cells.

Subject Keywords

Molecular electronics., Fused molecules, conjugated polymers, biosensor, OLED, solar cell.

URI

http://etd.lib.metu.edu.tr/upload/12624487/index.pdf
https://hdl.handle.net/11511/45441

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

A triazoloquinoxaline and benzodithiophene bearing low band gap copolymer for electrochromic and organic photovoltaic applications HACIOGLU, Serife O.; UNLU, Naime A.; AKTAS, Ece; HIZALAN, Gonul; Yildiz, Esra D.; Çırpan, Ali; Toppare, Levent Kamil (2017-06-01) A new triazoloquinoxaline and benzodithiophene based copolymer was synthesized to investigate its electro-chemical, optical and photovoltaic behaviors. According to the polymer design, combination of two acceptor units (benzotriazole and quinoxaline) which contribute imine bonds to the structure and a triazoloquinoxaline unit for enhancing electron accepting ability was pursued. As a result of electrochemical studies, the copolymer PTQBDT has a low lying HOMO energy level as - 5.23 eV which increases the ch...
Fabrication of a promising immobilization platform based on electrochemical synthesis of a conjugated polymer Buber, Ece; SÖYLEMEZ, SANİYE; UDUM, YASEMİN; Toppare, Levent Kamil (2018-07-01) Since conjugated polymers are an important class of materials with remarkable properties in biosensor applications, in this study, a novel glucose biosensor based on a conjugated polymer was fabricated via the electropolymerization of the monomer 10,13-bis(4-hexylthiophen-2-yl)dipyridol[3,2-a:2',3'-c]phenazine onto a graphite electrode surface. Glucose oxidase (GOx) was used as the model biological recognition element. As a result of the enzymatic reaction between GOx and glucose, the glucose amount was det...
Alkyl-end phenanthroimidazole modification of benzotriazole based conjugated polymers for optoelectronic applications Cevher, Şevki Can; Keles, Duygu; Hızalan, Gonul; Toppare, Levent Kamil; Çırpan, Ali (2018-10-01) A new triazoloquinoxaline and benzodithiophene based copolymer was synthesized to investigate its electrochemical, optical and photovoltaic behaviors. According to the polymer design, combination of two acceptor units (benzotriazole and quinoxaline) which contribute imine bonds to the structure and a triazoloquinoxaline unit for enhancing electron accepting ability was pursued. As a result of electrochemical studies, the copolymer PTQBDT has a low lying HOMO energy level as −5.23 eV which increases the chem...
Synthesis of bistriphenylamine- and benzodithiophene-based random conjugated polymers for organic photovoltaic applications CETIN, Asli; ISTANBULLUOGLU, Cagla; HACIOGLU, Serife Ozdemir; CEVHER, ŞEVKİ CAN; Toppare, Levent Kamil; Çırpan, Ali (2017-11-15) In this study, donor-acceptor random polymers containing benzotriazole acceptor and bistriphenylamine and benzodithiophene donors, P1 and P2, were successfully synthesized by Stille coupling polymerization. The effect of bistriphenylamine moiety and thiophene -conjugated linker on electrochemical, spectroelectrochemical, and optical behaviors of the polymers were investigated. Optoelectronic properties and photovoltaic performance of the polymers were examined under the illumination of AM 1.5G, 100 mWcm(-2)...
Controlled assemble and microfabrication of zeolite particles on SiO2 substrates for potential biosensor applications Öztürk, Semra; Turan, Raşit; Akata Kurç, Burcu (2008-12-04) Zeolite nanoparticles were organized into functional entities on SiO2 substrates and microfabrication technique was tested to form patterns of zeolite nanoparticles on SiO2 using the electron beam lithography (EBL). The effect of different techniques for efficient zeolite assembly on the SiO2 substrates was investigated. For this purpose, three different assembly techniques were tested. The first two methods are spin-coating (SC) and ultrasound aided strong agitation (US) methods, which were tested using ba...

Citation Formats

Ş. C. Cevher, “Fused conjugated structures for organic electronics,” Thesis (Ph.D.) -- Graduate School of Natural and Applied Sciences. Chemistry., Middle East Technical University, 2019.