Low Band Gap Thienoisoindigo-Based Molecules For Near-Infrared Organic Photovoltaics
2017 24TH INTERNATIONAL WORKSHOP ON ACTIVE-MATRIX FLATPANEL DISPLAYS AND DEVICES (AM-FPD)（2017）
Abstract
Novel near-infrared organic molecules (TII 1 and TII 2) based on D-pi-A-pi-D structure using di-p-tolylamine and carbazole as the electron donor, thiophene and benzene as the pi-linker, and thienoisoindigo (TII) as the electron acceptor were synthesized and their photo-physical properties were characterized. The maximum absorption band of TII 1 and TII 2 located at 790 and 627 nm while the absorption onset was extended to 923 and 726 nm, respectively, which corresponding to the bandgap of 1.50 and 1.70 eV. The bulk heterojunction solar cell device fabricated by using TII 1/PC61BM and TII 2/PC61BM as the active layer exhibited a power conversion efficiency (PCE) of 0.02 similar to 0.82%.
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Key words
low band gap thienoisoindigo-based molecule,near-infrared organic photovoltaics,near-infrared organic molecule,di-p-tolylamine,carbazole,electron donor,thiophene,benzene,S-linker,thienoisoindigo,electron acceptor,photophysical property,maximum absorption band,bulk heterojunction solar cell device,TII 1-PC61BM,TII 2-PC61BM,power conversion efficiency,PCE,D-π-A-π-D structure,wavelength 790 nm,wavelength 627 nm,wavelength 923 nm,wavelength 726 nm,electron volt energy 1.50 eV,electron volt energy 1.70 eV,efficiency 0.02 percent to 0.82 percent
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