Syntheses of conjugated polymers and investigation the effect of gold nanoparticle - thiol interaction for organic solar cell application

Gülmez, Selin
In this thesis, five benzo[c][1,2,5] thiadiazole-based conjugated polymers were synthesized. Four of them were synthesized via Stille and Suzuki coupling reactions and the remaining one was synthesized by post-polymerization. The effect of functional groups of the tip of the alkyl chain was analyzed. Moreover, thiol group and gold nanoparticle interaction on the organic solar cell efficiency for P1-SH were investigated. Electronic and optical band gaps of polymers were found as 1.85/1.81, 1.95/1.85, 1.83/1.95, 1.87/1.87, and 1.83/1.85 eV respectively for P1, P1-Br, P1-SH, P2, and P3. Furthermore, the effect of the addition of gold nanoparticles to the active layer of organic solar cells on photovoltaic properties was investigated. Gel permeation chromatography (GPC), thermal gravimetric analysis (TGA), differential scanning calorimeter (DSC), and UV-Vis-NIR spectroscopy were used to evaluate the synthesized polymers. By using the cyclic voltammetry (CV) technique, redox behaviors and electronic band gaps of polymers were examined. In a nitrogen-filled glovebox setup, device manufacture and current/voltage property measurements were performed. Synthesized polymers served as the donor units for the typical type device structure of ITO/PEDOT:PSS/polymer:PC71BM/LiF/Al, with PC71BM serving as the acceptor unit. Under 100 mW cm-2 light, the photovoltaic characteristics of the built-in devices were measured. Best device performances in terms of PCE were found as 2.06 % for P1, 1.52 % for P1-Br, 1.22 % for P1-SH. Photovoltaic studies of P1-SH:AuNPs were investigated and the best device performances in terms of PCE were found as 1.08 %.


Synthesis, characterization and photovoltaic properties of benzo[c][1,2,5]oxadiazole based conjugated polymers for organic solar cells
Karakurt, Oğuzhan; Çırpan, Ali; Günbaş, Emrullah Görkem; Department of Chemistry (2021-1-22)
In this thesis, six conjugated polymers were synthesized by coupling of 2,1,3- benzoxadiazole derivatives with donor groups via Stille polycondensation reactions. Moreover, the effect of molecular weight for P1 and P2, effect of position of alkyl chain for P5 and effect of π-bridge groups for P6 which are selenophene and thiophene on optical, electrochemical, and photovoltaic properties were investigated. Also, modifications on alkyl chains of P3 and P4 were performed to increase their functionalities via p...
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...
Electrochemical synthesis of new conjugated polymers based on carbazole and furan units
Oguzturk, H. Esra; TİRKEŞ, SEHA; Önal, Ahmet Muhtar (2015-08-01)
In this study, synthesis of four new monomers; 3,6-di(2-furyl)-9H-carbazole (M1), 3,6-di(2-furyl)-9-ethyl-carbazole (M2), 2,7-di(2-furyl)-9-H-carbazole (M3), 2,7-di(2-furyl)-9-(tridecan-7-yl)-9H-carbazole (M4), was achieved via Stifle cross-coupling reaction. The monomers were electrochemically polymerized, via repetitive cycling in acetonitrile-tetrabutylammonium hexafluorophosphate electrolytic medium. Optical and electrochemical properties of the monomers and their corresponding polymers were investigate...
Investigation the effect of π bridge and side chain on photovoltaic properties of benzodithiophene and quinoxaline based conjugated polymers
Taşkaya Aslan, Sultan; Alemdar, Eda; Hacıefendioğlu, Tuğba; UDUM, YASEMİN; Toppare, Levent Kamil; Yıldırım, Erol; Çırpan, Ali (2022-04-15)
© 2022 Elsevier LtdA series of donor–acceptor type alternative polymers containing 2D-BDT and 1D-BDT as the donors and quinoxaline as the acceptor were successfully obtained by Stille coupling reactions. Synthesized polymers containing selenophene and thiophene as π-bridges in their backbones and 2-ethylhexylselenophene and 2-ethylhexylalkoxy side groups on the BDT structure were named as P1, P2, P3 and P4, respectively. Eonsetox and Eonsetred were investigated for P1, P2, P3, and P4, respectively. Onset ox...
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)...
Citation Formats
S. Gülmez, “Syntheses of conjugated polymers and investigation the effect of gold nanoparticle - thiol interaction for organic solar cell application,” M.S. - Master of Science, Middle East Technical University, 2022.