THESIS
2023
1 online resource (xx, 138 pages) : illustrations (some color)
Abstract
Organic solar cells (OSCs) have drawn extensive research interests due to their unique
advantages, such as light weight, low cost, mechanical flexibility, low toxicity, etc. Although
OSCs have achieve incredible progress in last two decades, their power conversion efficiencies
(PCEs) still lag behind the other leading technologies. Structure property relationships of OSCs
need to be thoroughly explored to further drive the progress in this field.
Chapter 2 focuses on the impacts that linker units bring to the Y6-based polymer
acceptors. Different rigidity and coplanarity deriving from the linker unit moieties cause the
polymers to have different degrees of intramolecular conjugation and interchain packing. As a
result, the J
SCs and FFs of the all-PSCs were heavily influenced. The polyme...[
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Organic solar cells (OSCs) have drawn extensive research interests due to their unique
advantages, such as light weight, low cost, mechanical flexibility, low toxicity, etc. Although
OSCs have achieve incredible progress in last two decades, their power conversion efficiencies
(PCEs) still lag behind the other leading technologies. Structure property relationships of OSCs
need to be thoroughly explored to further drive the progress in this field.
Chapter 2 focuses on the impacts that linker units bring to the Y6-based polymer
acceptors. Different rigidity and coplanarity deriving from the linker unit moieties cause the
polymers to have different degrees of intramolecular conjugation and interchain packing. As a
result, the J
SCs and FFs of the all-PSCs were heavily influenced. The polymer acceptors with
the vinylene moiety as the linker unit yielded outstanding PCEs reaching 17%.
In Chapter 3, different electron deficient groups were incorporated to unfused-ring
acceptors (UFAs), causing a manipulation in photovoltaic parameters of the final devices. By
incorporating a central core with a weaker electron accepting power, a high V
OC was achieved,
resulting in an improvement of PCE.
Chapter 4 concentrates on the alkyl chain engineering of the Y6-based polymer
acceptors. By substituting the outer side chain with 2-butyloctyl side chain and the inner side
chain with 1-cyclohexyldecyl side chain, the polymers showed much stronger aggregation
tendency. As a result, the charge mobilities are enhanced, give rise to a much higher FF as well
as PCE.
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