Ternary organic solar cell applications of benzodithiophene -based polymers

Date

2025-6-26

Author

Oral, Pelin

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Organic solar cells are becoming a promising photovoltaic technology, offering advantages such as lightweight, flexible devices and cost-effective fabrication processes. The ternary strategy, which introduces a third component into the active layer, has been extensively applied to enhance photovoltaic performance by broadening light absorption, generating additional energy and charge transfer pathways and optimizing the morphology of the active layer. In this work, two D-π-A type conjugated donor polymers containing fluorinated and chlorinated BDT donor units, a thiophene π-bridge, and a BO acceptor unit designed, synthesized and their ternary solar cell applications were studied. The optical and electrochemical properties of the BDTOX-Cl and BDTOX-F polymers were investigated through UV-Visible spectroscopy, photoluminescence spectroscopy and cyclic voltammetry measurements. Moreover, halogenation approach on photovoltaic performance was investigated by fabricating binary and ternary devices. To achieve best photovoltaic performance, various device architectures were studied and the active layer was optimized by adjusting parameters such as active layer concentration, coating speed and annealing duration. Furthermore, for ternary devices, the photovoltaic performance was enhanced by selecting appropriate third components and varying the weight ratios of the donor and acceptor materials. Characterizations of organic solar cells were conducted under solar simulator with Keithley sourcemeter.The best photovoltaic performance obtained from device with ITO/PEDOT:PSS/BDTOX-Cl:D18:Y6/PDINN/Ag architecture and it exhibits power conversion efficiency of (PCE) of 12.82 %, short circuit current density (Jsc) of 22.37 mA/cm2 , open circuit voltage (Voc) of 0.85 V and fill factor (FF) of 67.43%.

Subject Keywords

Organic solar cells, Benzodithiophene, Ternary OSCs, Photovoltaic

URI

https://hdl.handle.net/11511/115195

Collections

Graduate School of Natural and Applied Sciences, Thesis