TY - JOUR
T1 - Mechanically Robust All-Polymer Solar Cells from Narrow Band Gap Acceptors with Hetero-Bridging Atoms
AU - Fan, Qunping
AU - Su, Wenyan
AU - Chen, Shanshan
AU - Kim, Wansun
AU - Chen, Xiaobin
AU - Lee, Byongkyu
AU - Liu, Tao
AU - Méndez-Romero, Ulises A.
AU - Ma, Ruijie
AU - Yang, Tao
AU - Zhuang, Wenliu
AU - Li, Yu
AU - Li, Yaowen
AU - Kim, Taek Soo
AU - Hou, Lintao
AU - Yang, Changduk
AU - Yan, He
AU - Yu, Donghong
AU - Wang, Ergang
N1 - Publisher Copyright:
© 2020 Elsevier Inc.
PY - 2020/3/18
Y1 - 2020/3/18
N2 - We developed three narrow band-gap polymer acceptors PF2-DTC, PF2-DTSi, and PF2-DTGe with different bridging atoms (i.e., C, Si, and Ge). Studies found that such different bridging atoms significantly affect the crystallinity, extinction coefficient, electron mobility of the polymer acceptors, and the morphology and mechanical robustness of related active layers. In all-polymer solar cells (all-PSCs), these polymer acceptors achieved high power conversion efficiencies (PCEs) over 8.0%, while PF2-DTSi obtained the highest PCE of 10.77% due to its improved exciton dissociation, charge transport, and optimized morphology. Moreover, the PF2-DTSi-based active layer showed excellent mechanical robustness with a high toughness value of 9.3 MJ m−3 and a large elongation at a break of 8.6%, which is a great advantage for the practical applications of flexible devices. As a result, the PF2-DTSi-based flexible all-PSC retained >90% of its initial PCE (6.37%) after bending and relaxing 1,200 times at a bending radius of ∼4 mm.
AB - We developed three narrow band-gap polymer acceptors PF2-DTC, PF2-DTSi, and PF2-DTGe with different bridging atoms (i.e., C, Si, and Ge). Studies found that such different bridging atoms significantly affect the crystallinity, extinction coefficient, electron mobility of the polymer acceptors, and the morphology and mechanical robustness of related active layers. In all-polymer solar cells (all-PSCs), these polymer acceptors achieved high power conversion efficiencies (PCEs) over 8.0%, while PF2-DTSi obtained the highest PCE of 10.77% due to its improved exciton dissociation, charge transport, and optimized morphology. Moreover, the PF2-DTSi-based active layer showed excellent mechanical robustness with a high toughness value of 9.3 MJ m−3 and a large elongation at a break of 8.6%, which is a great advantage for the practical applications of flexible devices. As a result, the PF2-DTSi-based flexible all-PSC retained >90% of its initial PCE (6.37%) after bending and relaxing 1,200 times at a bending radius of ∼4 mm.
KW - all-polymer solar cells
KW - dithienosilole
KW - flexible solar cells
KW - mechanical robustness
KW - polymer acceptor
KW - power conversion efficiency
UR - https://www.scopus.com/pages/publications/85081121792
U2 - 10.1016/j.joule.2020.01.014
DO - 10.1016/j.joule.2020.01.014
M3 - 文章
AN - SCOPUS:85081121792
SN - 2542-4351
VL - 4
SP - 658
EP - 672
JO - Joule
JF - Joule
IS - 3
ER -