Donor-acceptor polymers with tunable infrared photoresponse

• Autores: London, Alexander E.; Huang, Lifeng; Zhang, Benjamin A.; Oviedo, María Belén; Tropp, Joshua; Yao, Weichuan; Wu, Zhenghui; Wong, Bryan M.; Ng, Tse Nga; Azoulay, Jason D.
• Año de publicación: 2017
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Polymers; Solar Cells
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Donor-acceptor (DA) conjugated polymers provide an important platform for the development of solution-processed optoelectronic devices. The complex interrelation between electronic properties and conformational disorder in these materials complicates the identification of design guidelines to control the bandgap at low energies, limiting the design of new optoelectronic and device functionalities. Here, we demonstrate that DA polymers comprised of exocyclic olefin substituted cyclopentadithiophene donors, in combination with conventional electron acceptors, display very narrow optical bandgaps (1.2 > Eoptg > 0.7 eV) and primary photoexcitations extending into the shortwave infrared. Theoretical calculations reveal fundamental structure-property relationships toward bandgap and energy level control in these spectral regions. Bulk heterojunction photodiodes fabricated using these new materials demonstrate a detectivity (D∗) of > 1011 Jones within a spectral range of 0.6-1.43 μm and measurable D∗ to 1.8 μm, the longest reported to date for conjugated polymer based systems.
Fil: London, Alexander E.. University of Mississippi; Estados Unidos
Fil: Huang, Lifeng. University of Mississippi; Estados Unidos
Fil: Zhang, Benjamin A.. University of Mississippi; Estados Unidos
Fil: Oviedo, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina. University of California; Estados Unidos
Fil: Tropp, Joshua. University of Mississippi; Estados Unidos
Fil: Yao, Weichuan. University of California at San Diego; Estados Unidos
Fil: Wu, Zhenghui. University of California at San Diego; Estados Unidos
Fil: Wong, Bryan M.. University of California; Estados Unidos
Fil: Ng, Tse Nga. University of California at San Diego; Estados Unidos
Fil: Azoulay, Jason D.. University of Mississippi; Estados Unidos