Synthesis, electrochromic characterization and solar cell application of thiophene bearing alternating copolymers with azobenzene and coumarin subunits

Üniversitemiz öğretim üyelerinden Prof. Dr. Levent Kamil Toppare ve Prof. Dr. Ali Çırpan’ın yazarları arasında bulunduğu “Synthesis, electrochromic characterization and solar cell application of thiophene bearing alternating copolymers with azobenzene and coumarin subunits” başlıklı makale Journal of Macromolecular Science, Part A: Pure and Applied Chemistry’de yayınlandı.

In this study, azobenzene and coumarin functionalized thiophene comprising two copolymers (poly (4-((3‴-hexyl-[2,2′:5′,2″:5″,2‴-tetrathiophene] − 3′-yl)methoxy) - 2H-chromen-2-one (P1) and poly (1-(4-((4‴-hexyl-[2,2′: 5′, 2″: 5″, 2‴ - tetrathiophene] − 3′-yl) methoxy) phenyl) −2-phenyldiazene) (P2)), were designed and synthesized according to the donor–acceptor (D–A) approach to investigate their electrochemical, optical and photovoltaic behaviors. Among the various copolymerization methods to obtain P1 and P2, Stille copolymerization reaction was preferred. The HOMO and LUMO values were determined via cyclic voltammetry (CV) as −5.64 eV and −3.76 eV for P1 and −5.47 eV and −3.83 eV for P2, respectively. The optical band gaps of the polymers were calculated as 1.88 eV and 1.64 eV using UV-VIS spectrophotometer for P1 and P2. Electrochemical and spectroelectrochemical studies for synthesized copolymers support their usage in organic solar cell applications. The organic solar cells (OSCs) were designed using polymer as an electron donor group and PC₆₀BM as an electron acceptor group. Performances of OSCs based on P1 and P2 were investigated with the device structure of ITO/PEDOT:PSS/Polymer(P1/P2):PC₆₀BM/LiF/Al. The preliminary solar cell results were reported here and studies are going on in our laboratories to increase the efficiency. The highest power conversion efficiency was obtained as 0.81% for P1 based device with 0.47 V open-circuit voltage (V_oc) and 4.92 mA/cm² current density (J_sc) values. The highest efficiency for P2 comprising device was found to be 0.96% under optimum conditions with 0.60 V and 4.98 mA/cm², V_oc and J_sc values, respectively.

Kalay, H., Yiğit, D., Hizalan, G., Güllü, M., Depci, T., Cirpan, A., . . . Hacioglu, S. O. (2020). Synthesis, electrochromic characterization and solar cell application of thiophene bearing alternating copolymers with azobenzene and coumarin subunits. Journal of Macromolecular Science, Part A: Pure and Applied Chemistry, 57(8), 589-599. doi:10.1080/10601325.2020.1740598

Makaleye erişim için: https://www.tandfonline.com/doi/full/10.1080/10601325.2020.1740598

Anahtar sözcükler:

Azobenzene; conducting polymers; coumarin; solar cell; thiophene bearing copolymers

Diğer Yazarlar:
Kalay, H., Yiğit, D., Hizalan, G. (ODTÜ), Güllü, M., Depci, T., & Hacioglu, S.O.