A triazoloquinoxaline and benzodithiophene bearing low band gap copolymer for electrochromic and organic photovoltaic applications

2017-06-01
HACIOGLU, Serife O.
UNLU, Naime A.
AKTAS, Ece
HIZALAN, Gonul
Yildiz, Esra D.
Çırpan, Ali
Toppare, Levent Kamil
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
199
views
0
downloads
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 chemical stability of the resulting polymer and leads to a higher V-oc. In addition, the copolymer has an ambipolar character with two well-defined redox couples in the n-doped state and multichromic behavior. In the context of optical studies, PTQBDT has wide absorption range in the visible region with a tail in the NIR region, which yields a low band gap of 1.20 eV. Organic photovoltaic devices were designed using PTQBDT (the electron donor) and PC71BM (the electron acceptor) for the preliminary studies. The resulting device exhibits a power conversion efficiency of 2.0% with a current density of 8.07 mA cm(-2), an open-circuit voltage of 0.45 V, and a fill factor of 55%. The carrier mobility of the PTQBDT was calculated as 3.00 x 10(-3) cm(2) V-1 S-1 via space-charge-limited current (SCLC) method.
Conjugated polymers, Triazoloquinoxaline, Benzodithiophene, Organic solar cell, Organic solar cell, Copolymer
https://hdl.handle.net/11511/35454
SYNTHETIC METALS
Department of Chemistry, Article

Suggestions

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 selenophene substituted benzodithiophene and fluorinated benzothiadiazole based conjugated polymers for organic solar cell applications
Cevher, Duygu; Taşkaya Aslan, Sultan; Bolayır, Eda; Hizalan Ozsoy, Gonul; UDUM, YASEMİN; Yıldırım, Erol; Toppare, Levent Kamil; Çırpan, Ali (2021-12-01)
A series of alternating conjugated copolymers which contain selenophene modified benzodithiophene and fluorine bearing benzothiadiazole have been synthesized via Stille polycondensation reaction to investigate the effect of the number of fluorine atoms substituted to the benzothiadiazole. Three different polymers, PBDTSe-BT, PBDTSe-FBT and PBDTSe-FFBT, were reported and their electrochemical, spectroelectrochemical, and photovoltaic behaviors were examined. Density functional theory calculations were perfor...
Fused conjugated structures for organic electronics
Cevher, Şevki Can; Çırpan, Ali; Department of Chemistry (2019)
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) ...
A functional immobilization matrix based on a conducting polymer and functionalized gold nanoparticles: Synthesis and its application as an amperometric glucose biosensor
Kesik, Melis; Kanik, Fulya Ekiz; Hizalan, Gonul; Kozanoglu, Duygu; Nalbant Esentürk, Emren; Timur, Suna; Toppare, Levent Kamil (Elsevier BV, 2013-08-02)
Combination of nanoparticles and biomolecules attracted considerable attention in biosensing applications. In this study, effective surface design was investigated by modifying the electrode surface with pristine and functionalized gold nanoparticles. For this purpose, spherical gold nanoparticles were synthesized and characterized with UV-vis spectroscopy and transmission electron microscopy (TEM) analyses. Then, gold nanoparticles were modified with mercaptopropionic acid (MPA) yielding Au-S bonds (Au NPs...
Tuning the electron beam evaporation parameters for the production of hole and electron transport layers for perovskite solar cells
Coşar, Mustafa Bura; Özenbaş, Ahmet Macit; Department of Metallurgical and Materials Engineering (2019)
This study evaluates the use of electron beam evaporation technique for the deposition of electron and hole transport layers for perovskite solar cells where cell productions were performed in n-i-p structure. NiO and TiO layers were studied for hole transport layer and TiO2 and Nb2O5 layers were deposited for electron transport purposes. To optimize the suitable evaporation parameters for efficient perovskite cell production, single layers of each material were deposited at different conditions of oxygen f...
Citation Formats
S. O. HACIOGLU et al., “A triazoloquinoxaline and benzodithiophene bearing low band gap copolymer for electrochromic and organic photovoltaic applications,” SYNTHETIC METALS, pp. 111–119, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35454.
METU IIS - Integrated Information Service open@metu.edu.tr