Syntheses of benzodithiophene and thienopyrroledione containing conjugated random polymers as components for organic solar cells

Download

index.pdf

Date

2017

Author

Azeri, Özge

Metadata

Show full item record

Item Usage Stats

273
views

90
downloads

In recent years organic solar cells (OSC) have attracted considerable attention as promising candidates for renewable energy technology because of their low cost, light weight and flexibility. In this study, in order to improve the efficiency of a bulk heterojunction solar cell, two conjugated random polymers were designed. For this purpose, benzodithiophene and thienopyrroledione containing two random copolymers were synthesized. The effects of several acceptors such as benzotriazole and benzothiadiazole on optoelectronic properties and the performance of bulk heterojunction polymer solar cells were investigated. Electrochemical and optical studies prove that these polymers could be candidates for organic solar cell applications. Both copolymers were n-and p- dopable. Thus, the HOMO and LUMO values were determined by using cyclic voltammetry resulted with the values -5.53 and -3.43 eV for P1 and -5.54 and -3.53 for P2, respectively. The optical band gap of the polymers were calculated by using UV-VIS-NIR spectroscopy as 2.10 and 2.01 eV for P1 and P2, correspondingly. Bulk-heterojunction solar cells were constructed with the configuration of ITO/PEDOT:PSS/Polymer:PC71BM/LiF/Al and the synthesized polymers were used as the electron donors and PC71BM as the electron acceptor in the active layer. The best performance is observed for device of P2 1:2 (w:w) ratio with a PCE of 5.83 % under standard AM 1.5 G at 100 mW/cm2.

Subject Keywords

Solar cells., Photovoltaic cells., Conjugated polymers.

URI

http://etd.lib.metu.edu.tr/upload/12620951/index.pdf
https://hdl.handle.net/11511/26430

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Syntheses of functional materials for organic photovoltaic and electrochromic device applications Varlıoğlu, Figen; Günbaş, Emrullah Görkem; Department of Polymer Science and Technology (2017) Thienothiophene based moities are widely investigated for organic solar cell applications. In this study, after synthesizing 2-ethylhexyl 4,6-dibromothieno [3,4-b]thiophene-2-carboxylate successfully, copolymerization with commercially available donor 4-(2-ethylhexyl)-2,6-bis(trimethylstannyl)-4H-dithieno[3,2-b:2',3'-d]pyrrole, DTPy, was performed via Stille coupling. At each step, Nuclear Magnetic Resonance (NMR) Spectroscopy were performed for structural analysis. Cyclic voltammogram was used for investig...
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...
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...
Syntheses and investigation of optoelectronic properties of benzothiadiazole and benzotriazole containing conjugated polymers Keleş, Duygu; Çırpan, Ali; Arslan Udum, Yasemin; Department of Polymer Science and Technology (2017) Benzothiadiazole is one of the most widely used acceptor units in Donor–Acceptor copolymers for organic solar cells (OSCs) with its strong electron withdrawing ability. It is also known that fluorine atom substitution directly to the backbone of conjugated polymers can improve the important parameters such as power conversion efficiency (PCE), open-circuit voltage (Voc), short-circuit current density (Jsc), and fill factor (FF) of OSCs. Besides benzothiadiazole, benzotriazole is another acceptor moiety whic...
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...

Citation Formats

Ö. Azeri, “Syntheses of benzodithiophene and thienopyrroledione containing conjugated random polymers as components for organic solar cells,” M.S. - Master of Science, Middle East Technical University, 2017.