Título : Diphenylphenoxy-Thiophene-PDI Dimers as
Acceptors for OPV Applications with Open Circuit Voltage Approaching 1 Volt |
Autor : Stenta, Caterina, Molina, Desiré Viterisi, Aurélien Montero Rama, María Pilar Pla, Sara Cambarau, Werther, Fernández Lázaro, Fernando Palomares, Emilio Marsal, Lluis F. Sastre Santos, Ángela |
Departamento: Departamentos de la UMH::Farmacología, Pediatría y Química Orgánica |
Fecha de publicación: 2018-03-26 |
URI : http://hdl.handle.net/11000/4803 |
Resumen :
Two new perylenediimides (PDIs) have been developed for use as electron acceptors in
solution-processed bulk heterojunction solar cells. The compounds were designed to exhibit maximal solubility in organic solvents, and reduced aggregation in the solid state. In order to achieve this,
diphenylphenoxy groups were used to functionalize a monomeric PDI core, and two PDI dimers were bridged with either one or two thiophene units. In photovoltaic devices prepared using PDI dimers
and a monomer in conjunction with PTB7, it was found that the formation of crystalline domains in either the acceptor or donor was completely suppressed. Atomic force microscopy, X-ray diffraction,
charge carrier mobility measurements and recombination kinetics studies all suggest that the lack of crystallinity in the active layer induces a significant drop in electron mobility. Significant surface
recombination losses associated with a lack of segregation in the material were also identified as a significant loss mechanism. Finally, the monomeric PDI was found to have sub-optimum LUMO energy matching the cathode contact, thus limiting charge carrier extraction. Despite these setbacks,
all PDIs produced high open circuit voltages, reaching almost 1 V in one particular case
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Palabras clave/Materias: organic solar cells photovoltaics perylenediimide non-fullerene acceptor PTB7 bulkheterojunction |
Área de conocimiento : Química orgánica |
Tipo documento : application/pdf |
Derechos de acceso: info:eu-repo/semantics/openAccess |
DOI : https://doi.org/10.3390/nano8040211 |
Aparece en las colecciones: Artículos Farmacología, Pediatría y Química Orgánica
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