Syntheses and characterization of benzotriazole, thienopyrroledione and benzodithiophene containing conjugated random terpolymers for organic solar cells

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2019
Göksu, Kardelen.
Two random terpolymers, PBTS and PBTSe were designed and synthesized successfully as the donor units for polymer organic solar cell. Desired terpolymers contain alkoxy-benzodithiophene as an electron rich unit and Noctylthieno[3,4,c]pyrrole-4,6-dione (TPD) as the electron deficient group. Furthermore, thiophene and selenophene π bridges were introduced to benzotriazole unit as the acceptor moieties into copolymer backbone. The properties of synthesized terpolymers solar cell device were investigated by optical, electrochemical, spectroelectrochemical, kinetic studies. One of the terpolymer, PBTS showed an optical band gap of 1.84 eV with highest occupied molecular orbital (HOMO) energy level of -5.29 eV, open circuit voltage of 0.64 V, short circuit current density of 10.57 mA/cm2 and fill factor of 63.5%. The power conversion efficiency of bulk heterojunction solar cell device based on PBTS: PC71BM blend film was recorded as 4.30% by introducing 1% 1, 8 diiodooctane (DIO) as the solution process additive. The second terpolymer, PBTSe exhibited lower optical band gap of 1.78 eV with a HOMO energy level of -5.27 eV, open circuit voltage of 0.69 V, short circuit current density of 11.88 mA/cm2 and fill factor of 62.7%. The power conversion efficiency of bulk heterojunction solar cell device based on PBTS: PC71BM blend film was vi recorded as 5.15% by introducing 3% diphenyl ether (DPE) as the solution process additive
Citation Formats
K. Göksu, “Syntheses and characterization of benzotriazole, thienopyrroledione and benzodithiophene containing conjugated random terpolymers for organic solar cells,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Chemistry., Middle East Technical University, 2019.