THESIS
2017
xii, 60 pages : illustrations ; 30 cm
Abstract
Organic solar cells (OSC) technology is regarded as a great potential to solve the currently
pressing energy crisis. It is because OSCs have the potential to fabricate large-area
solution- processed low cost solar cells. However, in order to achieve this goal, the power
conversion efficiency (PCE) must be increased further. The most important advantage of
organic solar cell is the highly tunable optoelectronic properties achieved by changing the
chemical structure of the organic molecules. After years of research, accumulated
experience has already inspired the design of new materials for ideal device performance.
One of the central and easy strategies for material chemists is to modify the existing high-performance
materials. Numerous cases have proven that this way can retain...[
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Organic solar cells (OSC) technology is regarded as a great potential to solve the currently
pressing energy crisis. It is because OSCs have the potential to fabricate large-area
solution- processed low cost solar cells. However, in order to achieve this goal, the power
conversion efficiency (PCE) must be increased further. The most important advantage of
organic solar cell is the highly tunable optoelectronic properties achieved by changing the
chemical structure of the organic molecules. After years of research, accumulated
experience has already inspired the design of new materials for ideal device performance.
One of the central and easy strategies for material chemists is to modify the existing high-performance
materials. Numerous cases have proven that this way can retain the desired
properties of the original structure and some improvements are shown for the device
performance.
In the field of OSC, the predominantly used acceptor is the fullerene derivative PC
71BM.
The desirable electron mobility and ultrafast charge transfer property makes PC
71BM an
ideal material for OSCs. However, the major drawback of PC
71BM is the high cost, which
will in turn increase the manufacturing cost of the device. In order to tackle this problem,
non-fullerene molecular acceptors are being developed rapidly for their comparable
mobility but a much lower cost. In this study, a high performance non-fullerene acceptor
ITIC was taken as the model for modifications and two novel acceptors 2FID-IDTT and
4FID-IDTT are being synthesized and single junction OSCs are fabricated to study its
optoelectronic properties.
These two acceptors could achieve relatively high efficiencies (8.9% and 7.8% respectively)
with a medium-bandgap polymer PffBT-2DT which is a high-performance polymer in the
fullerene-based systems.
This work demonstrates that the modification strategy is a successful method for achieving
high performance material for OSC applications.
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