Methanol represents an attractive non-food raw material in biotechnological processes from an economic and process point of view. It is vital to elucidate methanol metabolic pathways, which will help to genetically construct non-native methylotrophs.
Terminal
group modification is one of the most influential factors
for small-molecular donors compared with their polymer counterparts,
resulting in an opportunity to optimize the morphology of all-small-molecule
organic solar cells (ASM-OSCs). In this article, we report three novel
small-molecular donors with branching points at the 1-, 2-, and 3-positions
in alkyl terminal chains, called BSCl-C1, BSCl-C2, and BSCl-C3, respectively. Using IDIC-4Cl as the acceptor,
the subtle branching position shift achieves a dramatic disparity
in photovoltaic parameters, as indicated by the short circuit current
(J
sc) changing from 4.9 to 20.1 to 14.2
mA cm–2 and the fill factor varying from 33.9 to
71.3 to 67.0% for BSCl-C1, BSCl-C2, and BSCl-C3, respectively. The best device performance of 12.40%
is obtained by the BSCl-C2:IDIC-4Cl system, which not
only ranks among the top values reported to date but also exhibits
low energy loss in systems that use IDIC as acceptors. The notable
device performance based on BSCl-C2 is attributed to
the optimized phase morphology caused by the strong molecular crystallinity
and suitable intermolecular interaction with IDIC-4Cl. These results
demonstrate that suitably tuning the branching position of terminal
groups could promote the high performance of ASM-OSCs.
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