Solution processed bulk heterojunction organic solar cells using small organic semiconducting materials based on fluorene core unit

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Abstract

This paper illustrates the synthesis of a new donor-π-donor (D-π-D) type fluorene and hexyl-bithiophene units based chromophore, named as 5′,5‴-(9,9-dioctyl-9-H-fluorene-2-7-diyl)bis (5-hexyl-2,2′-bithiophene) (9RFL) via simple Suzuki coupling reaction. The synthesized 9RFL chromophore was applied as donor for solution-processed bulk-heterojunction (BHJ)-organic solar cells (OSCs). 9RFL chromophore showed the acceptable electrochemical behavior with estimated HOMO and LUMO energy levels of −5.43 eV and −3.50 eV, respectively. A reasonable power conversion efficiency (PCE) of ∼2.13% along with high short circuit current density (JSC) of ∼9.91 mA/cm2, and open circuit voltage (VOC) of ∼0.718 V were attained by the fabricated BHJ-OSCs with the configuration of ITO/PEDOT:PSS/9RFL:PC61BM (1:3, w/w ratio)/Au.

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Abdullah, Ameen, S., Akhtar, M. S., Fijahi, L., Kim, E. B., & Shin, H. S. (2019). Solution processed bulk heterojunction organic solar cells using small organic semiconducting materials based on fluorene core unit. Optical Materials, 91, 425–432. https://doi.org/10.1016/j.optmat.2019.04.001

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