EFFECT OF π-BRIDGES ON ELECTROCHEMICAL AND PHOTOVOLTAIC PROPERTIES OF BENZOTHIADIAZOLE AND BENZODITHIOPHENE BASED CONJUGATED POLYMERS

2022-1-28
Dikbıyık, Dilan Ece
In this study, a series of the Donor -π bridge- Acceptor type conjugated polymers (PT1, PT2, and PT3) were designed and synthesized via Pd-catalyzed Stille polycondensation reactions. Synthesized polymers were used as donor moieties and blended with acceptor unit PC71BM to form the active layer of the bulk heterojunction organic solar cell (BHJ OSC). Polymers contain electron-deficient benzothiadiazole (BT) as acceptor unit and electron-rich benzodithiophene (BDT) as donor unit. Moreover, thiophene [T], selenophene [Se], and thieno[3,2-b] thiophene [TT] were introduced to the polymer backbone as the π-bridge. This study examined the effects of π-bridges on the optical, electrochemical, and photovoltaic properties of the conjugated polymers. The optical band gaps of the PT1, PT2, and PT3 were tuned from 1.70 to 1.58 to 1.61 eV with HOMO levels up-shifted from -5.60 to -5.48 to -5.33 eV, respectively, as the π-bridge was changed from T to Se, then to TT. OSCs were constructed with the device architecture of ITO/PEDOT: PSS/Polymer: PC71BM/LiF/Al, and power conversion efficiency (PCE) of the devices were measured under standard AM 1.5G illumination (100 mW/cm2). The highest PCE of bulk heterojunction solar cells was found as 3.48 % for PT1 and 2.42 % for PT2.

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Citation Formats
D. E. Dikbıyık, “EFFECT OF π-BRIDGES ON ELECTROCHEMICAL AND PHOTOVOLTAIC PROPERTIES OF BENZOTHIADIAZOLE AND BENZODITHIOPHENE BASED CONJUGATED POLYMERS,” M.S. - Master of Science, Middle East Technical University, 2022.