Singlet Exciton Fission in Nanostructured Organic Solar Cells

Citations Over TimeTop 1% of 2011 papers

Abstract

Singlet exciton fission is an efficient multiexciton generation process in organic molecules. But two concerns must be satisfied before it can be exploited in low-cost solution-processed organic solar cells. Fission must be combined with longer wavelength absorption in a structure that can potentially surpass the single junction limit, and its efficiency must be demonstrated in nanoscale domains within blended devices. Here, we report organic solar cells comprised of tetracene, copper phthalocyanine, and the buckyball C(60). Short wavelength light generates singlet excitons in tetracene. These are subsequently split into two triplet excitons and transported through the phthalocyanine. In addition, the phthalocyanine absorbs photons below the singlet exciton energy of tetracene. To test tetracene in nanostructured blends, we fabricate coevaporated bulk heterojunctions and multilayer heterojunctions of tetracene and C(60). We measure a singlet fission efficiency of (71 ± 18)%, demonstrating that exciton fission can efficiently compete with exciton dissociation on the nanoscale.

Related Papers

• → Singlet Heterofission in Tetracene–Pentacene Thin‐Film Blends(2020)17 cited
• → Singlet Heterofission in Tetracene–Pentacene Thin‐Film Blends(2020)2 cited
• → Exciton dynamics in pentacene and tetracene studied using optical pump-probe spectroscopy(2005)2 cited
• → Photoelectric properties of tetracene‐pentacene heterojunction(2004)
• → Singlet fission in acene blends(2021)