High-Performance
Nonfullerene Organic Photovoltaic Cells Using a TPD-Based Wide Bandgap Donor Polymer
Posted on 2019-08-06 - 16:33
Organic
photovoltaics (OPVs) consisting of a wide bandgap polymer donor and
a nonfullerene acceptor (NFA) have received attention because they
can effectively overcome the weaknesses of efficiency and stability
for fullerene-based OPVs. One of the NFAs, ITIC, shows an excellent
power conversion efficiency, as well as controllable solubility, absorption,
crystallinity, and energy level. Thus, high-efficiency OPVs could
be achieved by developing polymer donors appropriate for use with
ITIC-based OPVs. In this study, the synthesized polymer donor, PBDTT-8ttTPD,
containing alkylthieno[3,2-b]thiophene as π-bridge
and thieno[3,4-c]pyrrole-4,6(5H)-dione
(ttTPD) shows strong absorption with a sharp peak edge at around 700
nm. In addition, the high hole mobility and face-on oriented polymer
structures in the blend films make ttTPD the best candidate for the
donor in NFA-based OPVs. Notably, the molecular weight of the face-on
preferred polymer donor is crucial for determining the power conversion
efficiency (PCE) of the NFA-based devices. A high molecular weight
improves the π–π stacking ordering, absorption,
and nanomorphology of the blend films, resulting in a dramatic PCE
improvement from 5.76% to 11.05% compared with that of the fullerene-based
OPV device (7.86%).
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Park, Jong Baek; Ha, Jong-Woon; Jung, In Hwan; Hwang, Do-Hoon (2019). High-Performance
Nonfullerene Organic Photovoltaic Cells Using a TPD-Based Wide Bandgap Donor Polymer. ACS Publications. Collection. https://doi.org/10.1021/acsaem.9b00835