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Volume 4
Nano Research & Applications
ISSN: 2471-9838
Page 97
&
JOINT EVENT
October 04-05, 2018 Moscow, Russia
2
nd
Edition of International Conference on
26
th
International Conference on
Advanced Nanotechnology
Materials Technology and Manufacturing Innovations
Advanced Nanotechnology 2018
& Materials-Manufacturing 2018
October 04-05, 2018
Recent research progress of photovoltaic materials for high performance polymer solar cells
Yong Fang Li
Soochow University, China
P
olymer solar cells (PSCs) have attracted great attention in the past decade, because of the advantages of a simple
device structure, lightweight and capability to be fabricated into flexible and semi-transparent devices. The key
photovoltaic materials of PSCs are conjugated polymer donors and the fullerene or non-fullerene acceptors. Recently, the
non-fullerene n-type organic semiconductor (n-OS) (such as the low bandgap n-OS ITIC) acceptors have attracted great
attention for their high photovoltaic performance. To match with the low bandgap ITIC acceptor, we developed a series
of medium bandgap 2D-conjugated D-A copolymer donors based on bithienyl-benzodithiophene (BDTT) as donor
unit and fluorobenzotriazole (FBTA) as acceptor unit. The D-A copolymer donors possess complementary absorption
spectra and matching electronic energy levels with ITIC acceptor. By side chain engineering (alkyl-thienyl, alkylthio-
thienyl, trialkylsilyl-thieny or alkyl-difluorothienyl substitution) on the thiophene conjugated side chains of the medium
bandgap polymers, the power conversion efficiency (PCE) of the PSCs with the polymers as donor and ITIC as acceptor
reached 9.26%5~11.63%. By side chain isomerization of ITIC, the PCE of the non-fullerene PSCs was further improved
to 11.77%6~12.05%7. The results indicate that the side chain engineering of the conjugated polymer donors and n-OS
acceptors are an effective way to improve photovoltaic performance of the PSC. In addition, we also developed high-
performance low bandgap n-OS acceptors and low cost conjugated polymer donor materials recently.
liyf@iccas.ac.cnNano Res Appl 2018, Volume 4
DOI: 10.21767/2471-9838-C5-021