TY - JOUR
T1 - An asymmetrical fused-ring electron acceptor designed by a cross-conceptual strategy achieving 15.6% efficiency
AU - Gao, Wei
AU - Ma, Xiaoling
AU - An, Qiaoshi
AU - Gao, Jinhua
AU - Zhong, Cheng
AU - Zhang, Fujun
AU - Yang, Chuluo
N1 - Publisher Copyright:
© 2020 The Royal Society of Chemistry.
PY - 2020/8/7
Y1 - 2020/8/7
N2 - Due to their unique merits, asymmetrical fused-ring electron acceptors (FREAs) have received increasing attention in the field of organic photovoltaics (OPVs). Herein, we designed and synthesized an asymmetrical FREA, namely AY6, by employing a cross-conceptual strategy which combines the structural features of asymmetrical IT6-4F with high-performance Y6. Compared to Y-shape Y6, X-shape AY6 shows poor crystallization properties and thus a significantly blue-shifted absorption. However, it is precisely because of this unfavorable self-stacking effect that AY6 has an opportunity to pack with PM6 and form a new intermixed phase. As a result, the PM6:AY6 blend film exhibits a perfect face-on orientation with stronger π-π stacking than the PM6:Y6 blend film, which facilitates efficient exciton dissociation and balanced carrier transport, and therefore higher FF. In general, such a cross-conceptual design strategy is an effective method which not only boosts the efficiency of asymmetrical FREA-based OSCs but also increases the fill factors of OSCs based on Y6-like FREAs.
AB - Due to their unique merits, asymmetrical fused-ring electron acceptors (FREAs) have received increasing attention in the field of organic photovoltaics (OPVs). Herein, we designed and synthesized an asymmetrical FREA, namely AY6, by employing a cross-conceptual strategy which combines the structural features of asymmetrical IT6-4F with high-performance Y6. Compared to Y-shape Y6, X-shape AY6 shows poor crystallization properties and thus a significantly blue-shifted absorption. However, it is precisely because of this unfavorable self-stacking effect that AY6 has an opportunity to pack with PM6 and form a new intermixed phase. As a result, the PM6:AY6 blend film exhibits a perfect face-on orientation with stronger π-π stacking than the PM6:Y6 blend film, which facilitates efficient exciton dissociation and balanced carrier transport, and therefore higher FF. In general, such a cross-conceptual design strategy is an effective method which not only boosts the efficiency of asymmetrical FREA-based OSCs but also increases the fill factors of OSCs based on Y6-like FREAs.
UR - http://www.scopus.com/inward/record.url?scp=85090138099&partnerID=8YFLogxK
U2 - 10.1039/d0ta03985c
DO - 10.1039/d0ta03985c
M3 - Article
AN - SCOPUS:85090138099
SN - 2050-7488
VL - 8
SP - 14583
EP - 14591
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 29
ER -
