Chalcogen-Atom-Annulated Perylene Diimide Trimers for Highly Efficient Nonfullerene Polymer Solar Cells.
Macromol Rapid Commun
; 38(23)2017 Dec.
Article
em En
| MEDLINE
| ID: mdl-28921741
ABSTRACT
This communication reports the synthesis of two novel chalcogen-atom-annulated perylene diimide (PDI) trimers with twisted structures, TriPDI-S and TriPDI-Se, for efficient nonfullerene polymer solar cells. TriPDI-Se exhibits more compact molecular arrangement due to the stronger intermolecular interactions induced by the selenium atom. This selenium annulation endows TriPDI-Se with improved absorption and crystallinity in its blend film. The resulting devices exhibit enhanced Jsc of 17.15 mA cm-2 and fill factor (FF) of 66.8%, which are much higher than those of TriPDI-S devices (Jsc = 16.71 mA cm-2 ; FF = 63.6%). Although TriPDI-Se exhibits lower-lying energy levels, TriPDI-Se devices still obtain a higher Voc of 0.77 V compared to TriPDI-S devices (Voc = 0.74 V), which is mainly originated from the reduced recombination in the related devices. Finally, the power conversion efficiency is significantly elevated from 7.86% for TriPDI-S devices to 8.82% for TriPDI-Se devices.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Polímeros
/
Calcogênios
Idioma:
En
Revista:
Macromol Rapid Commun
Ano de publicação:
2017
Tipo de documento:
Article