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Diphenylphenoxy-Thiophene-PDI Dimers as Acceptors for OPV Applications with Open Circuit Voltage Approaching 1 Volt


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Title:
Diphenylphenoxy-Thiophene-PDI Dimers as Acceptors for OPV Applications with Open Circuit Voltage Approaching 1 Volt
Authors:
Caterina, Stenta
Desiré, Molina
Aurélien, Viterisi
Montero Rama, María Pilar
Pla, Sara
Werther, Cambarau
Fernández-Lázaro, Fernando
Emilio, Palomares
Lluis F., Marsal
Sastre-Santos, Ángela
Department:
Farmacología, Pediatría y Química Orgánica
Issue Date:
2018-07-27
Abstract:
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
Keywords/Subjects:
organic solar cells
photovoltaics
perylenediimide
non-fullerene acceptor
PTB7
bulkheterojunction
Type of document:
application/pdf
Access rights:
info:eu-repo/semantics/openAccess
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