Diphenylphenoxy-Thiophene-PDI Dimers as Acceptors for OPV Applications with Open Circuit Voltage Approaching 1 Volt
AbstractTwo 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. View Full-Text
- Supplementary File 1:
Supplementary (PDF, 2702 KB)
Share & Cite This Article
Stenta, C.; Molina, D.; Viterisi, A.; Montero-Rama, M.P.; Pla, S.; Cambarau, W.; Fernández-Lázaro, F.; Palomares, E.; Marsal, L.F.; Sastre-Santos, Á. Diphenylphenoxy-Thiophene-PDI Dimers as Acceptors for OPV Applications with Open Circuit Voltage Approaching 1 Volt. Nanomaterials 2018, 8, 211.
Stenta C, Molina D, Viterisi A, Montero-Rama MP, Pla S, Cambarau W, Fernández-Lázaro F, Palomares E, Marsal LF, Sastre-Santos Á. Diphenylphenoxy-Thiophene-PDI Dimers as Acceptors for OPV Applications with Open Circuit Voltage Approaching 1 Volt. Nanomaterials. 2018; 8(4):211.Chicago/Turabian Style
Stenta, Caterina; Molina, Desiré; Viterisi, Aurélien; Montero-Rama, María P.; Pla, Sara; Cambarau, Werther; Fernández-Lázaro, Fernando; Palomares, Emilio; Marsal, Lluis F.; Sastre-Santos, Ángela. 2018. "Diphenylphenoxy-Thiophene-PDI Dimers as Acceptors for OPV Applications with Open Circuit Voltage Approaching 1 Volt." Nanomaterials 8, no. 4: 211.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.