TY - JOUR
T1 - Facile Synthesis of Polycyclic Aromatic Hydrocarbon (PAH)–Based Acceptors with Fine-Tuned Optoelectronic Properties
T2 - Toward Efficient Additive-Free Nonfullerene Organic Solar Cells
AU - Wang, Yang
AU - Liu, Bin
AU - Koh, Chang Woo
AU - Zhou, Xin
AU - Sun, Huiliang
AU - Yu, Jianwei
AU - Yang, Kun
AU - Wang, Hang
AU - Liao, Qiaogan
AU - Woo, Han Young
AU - Guo, Xugang
N1 - Funding Information:
Y.W. and B.L. contributed equally to this work. Y.W. acknowledges the financial support by the China Postdoctoral Science Foundation (Grant No. 2018M630267), the Natural Science Foundation of China (Grant No. 21805128), and the SUSTech Presidential Postdoctoral Fellowship. H.S. thanks the Natural Science Foundation of China (Grant No. 21801124). X.G. is grateful to Shenzhen Basic Research Fund (JCYJ20170817105905899) and Shenzhen Peacock Plan Project (KQTD20140630110339343). H.Y.W. thanks the financial support from the NRF of Korea (2016M1A2A2940911 and 2015M1A2A2057506). The authors are grateful to C. Hyun and Prof. T. J. Shin for the grazing-incidence X-ray scattering measurements.
Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/6
Y1 - 2019/6
N2 - A series of polycyclic aromatic hydrocarbons (PAHs) with extended π-conjugated cores (from naphthalene, anthracene, pyrene, to perylene) are incorporated into nonfullerene acceptors for the first time. Four different fused-ring electron acceptors (FREAs), i.e., DTN-IC-2Ph, DTA-IC-3Ph, DTP-IC-4Ph, and DTPy-IC-5Ph, are prepared via simple and facile synthetic procedures, yielding a remarkable platform to study the structure–property relationship for nonfullerene solar cells. With the PAH core being extended systematically, the gradually redshifted absorption with enhanced molar extinction coefficient (ε) is realized, the energy level of the highest occupied molecular orbital is up-shifted, and the electron mobility is greatly enhanced. Meanwhile, the solubility decreases and the molecular packing becomes strengthened. As a result, with an optimized combination of these characteristics, DTP-IC-4Ph attains good solubility, high molar extinction coefficient, complementary absorption, suitable morphology, well-matched energy levels, as well as efficient charge dissociation and transport in blend film. Consequently, the DTP-IC-4Ph-based solar cells with a donor polymer, poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b′]dithiophene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl)benzo[1′,2′-c:4′,5′-c′]dithiophene-4,8-dione))] (PBDB-T) exhibit a promising power conversion efficiency of 10.37% without any additives, which is close to the best performance achieved in additive-free nonfullerene solar cells (NFSCs). The results demonstrate that the PAH building blocks have great potential for the construction of novel FREAs for efficient additive-free NFSCs.
AB - A series of polycyclic aromatic hydrocarbons (PAHs) with extended π-conjugated cores (from naphthalene, anthracene, pyrene, to perylene) are incorporated into nonfullerene acceptors for the first time. Four different fused-ring electron acceptors (FREAs), i.e., DTN-IC-2Ph, DTA-IC-3Ph, DTP-IC-4Ph, and DTPy-IC-5Ph, are prepared via simple and facile synthetic procedures, yielding a remarkable platform to study the structure–property relationship for nonfullerene solar cells. With the PAH core being extended systematically, the gradually redshifted absorption with enhanced molar extinction coefficient (ε) is realized, the energy level of the highest occupied molecular orbital is up-shifted, and the electron mobility is greatly enhanced. Meanwhile, the solubility decreases and the molecular packing becomes strengthened. As a result, with an optimized combination of these characteristics, DTP-IC-4Ph attains good solubility, high molar extinction coefficient, complementary absorption, suitable morphology, well-matched energy levels, as well as efficient charge dissociation and transport in blend film. Consequently, the DTP-IC-4Ph-based solar cells with a donor polymer, poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b′]dithiophene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl)benzo[1′,2′-c:4′,5′-c′]dithiophene-4,8-dione))] (PBDB-T) exhibit a promising power conversion efficiency of 10.37% without any additives, which is close to the best performance achieved in additive-free nonfullerene solar cells (NFSCs). The results demonstrate that the PAH building blocks have great potential for the construction of novel FREAs for efficient additive-free NFSCs.
KW - additive-free
KW - low-cost
KW - nonfullerene organic solar cells
KW - polycyclic aromatic hydrocarbon
KW - structure–property relationship
UR - http://www.scopus.com/inward/record.url?scp=85065291643&partnerID=8YFLogxK
U2 - 10.1002/aenm.201803976
DO - 10.1002/aenm.201803976
M3 - Article
AN - SCOPUS:85065291643
VL - 9
JO - Advanced Energy Materials
JF - Advanced Energy Materials
SN - 1614-6832
IS - 24
M1 - 1803976
ER -