TY - JOUR
T1 - A highly efficient polymer non-fullerene organic solar cell enhanced by introducing a small molecule as a crystallizing-agent
AU - Zheng, Yifan
AU - Huang, Jiang
AU - Wang, Gang
AU - Kong, Jaemin
AU - Huang, Di
AU - Mohadjer Beromi, Megan
AU - Hazari, Nilay
AU - Taylor, André D.
AU - Yu, Junsheng
N1 - Funding Information:
This research was funded by the Foundation for Innovation Research Groups of the National Natural Science Foundation of China ( NSFC ) (Grant No. 61421002 ), the NSFC (Grant Nos. 61675041 and 61177032 ), the Project of Science and Technology of Sichuan Province (Grant No. 2016HH0027 ). Andre D. Taylor thanks the DMR, and NSF-PECASE award. The Yale Institute for Nanoscience and Quantum Engineering ( YINQE ) and NSF MRSEC DMR 1119826 (CRISP) provided facility support. Parts of this research was carried out at the Center for Functional Nanomaterials, Brookhaven, National Laboratory, which is supported by the U.S. Department of Energy , Office of Basic Energy Sciences , under Contract No. DE-AC02-98CH10886 . Yifan Zheng also thanks the China Scholarship Council (No. 201506070069 ).
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Non-fullerene organic solar cells (OSCs) have attracted tremendous interest because of their potential to replace traditional expensive fullerene-based OSCs. To further increase the power conversion efficiency (PCE), it is necessary to offset the narrow absorption of the non-fullerene materials, which is often achieved by adding an additive (>10 wt%) to form a ternary blend. However, a high ratio of the third component can often be detrimental to the active layer morphology and can increase the complexity in understanding the device physics toward rationally designed improvements. In this work, we introduce 2,4-bis-[(N,N-diisobutylamino)-2,6-dihydroxyphenyl]-4-(4-diphenyliminio) squaraine (ASSQ) in the poly [(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl) benzo [1,2-b:4,5-b′] dithiophene)-co-(1,3-di(5-thiophene-2-yl)-5,7-bis(2-ethylhexyl) benzo [1,2-c:4,5-c′] dithiophene-4,8-dione)] (PBDB-T): 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno [2,3-d:2′,3′-d′]-s-indaceno [1,2-b:5,6-b′] dithiophene (ITIC) as an active layer “crystallizing-agent”. Through detailed morphology characterization, we find that the addition of 4 wt% ASSQ assists ITIC organization order and promotes PDBD-T:ITIC aggregation in the preferential face-on orientation. In addition, we demonstrate that the ASSQ and PBDB-T show efficient exciton dissociation in the ternary blend over Förster resonance energy transfer (FRET). We reveal using surface potential and solubility measurements that a ASSQ-ITIC co-crystalline structure forms which facilitates a significant improvement in the device PCE, from 8.98% to 10.86%.
AB - Non-fullerene organic solar cells (OSCs) have attracted tremendous interest because of their potential to replace traditional expensive fullerene-based OSCs. To further increase the power conversion efficiency (PCE), it is necessary to offset the narrow absorption of the non-fullerene materials, which is often achieved by adding an additive (>10 wt%) to form a ternary blend. However, a high ratio of the third component can often be detrimental to the active layer morphology and can increase the complexity in understanding the device physics toward rationally designed improvements. In this work, we introduce 2,4-bis-[(N,N-diisobutylamino)-2,6-dihydroxyphenyl]-4-(4-diphenyliminio) squaraine (ASSQ) in the poly [(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl) benzo [1,2-b:4,5-b′] dithiophene)-co-(1,3-di(5-thiophene-2-yl)-5,7-bis(2-ethylhexyl) benzo [1,2-c:4,5-c′] dithiophene-4,8-dione)] (PBDB-T): 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno [2,3-d:2′,3′-d′]-s-indaceno [1,2-b:5,6-b′] dithiophene (ITIC) as an active layer “crystallizing-agent”. Through detailed morphology characterization, we find that the addition of 4 wt% ASSQ assists ITIC organization order and promotes PDBD-T:ITIC aggregation in the preferential face-on orientation. In addition, we demonstrate that the ASSQ and PBDB-T show efficient exciton dissociation in the ternary blend over Förster resonance energy transfer (FRET). We reveal using surface potential and solubility measurements that a ASSQ-ITIC co-crystalline structure forms which facilitates a significant improvement in the device PCE, from 8.98% to 10.86%.
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U2 - 10.1016/j.mattod.2017.10.003
DO - 10.1016/j.mattod.2017.10.003
M3 - Article
AN - SCOPUS:85040792782
SN - 1369-7021
VL - 21
SP - 79
EP - 87
JO - Materials Today
JF - Materials Today
IS - 1
ER -