TY - JOUR
T1 - All-Small-Molecule Organic Solar Cells with Efficiency Approaching 16% and FF over 80%
AU - Meng, Lingxian
AU - Li, Mingpeng
AU - Lu, Guanyu
AU - Shen, Zichao
AU - Wu, Simin
AU - Liang, Huazhe
AU - Li, Zhixiang
AU - Lu, Guanghao
AU - Yao, Zhaoyang
AU - Li, Chenxi
AU - Wan, Xiangjian
AU - Chen, Yongsheng
N1 - Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/5/26
Y1 - 2022/5/26
N2 - Molecule engineering has been demonstrated as a valid strategy to adjust the active layer morphology in all-small-molecule organic solar cells (ASM-OSCs). In this work, two non-fullerene acceptors (NFAs), FO-2Cl and FO-EH-2Cl, with different alkyl side chains are reported and applied in ASC-OSCs. Compared with FO-2Cl, FO-EH-2Cl is designed by replacing the octyl alkyl chains with branched iso-octyl alkyl chains, leading to an enhanced molecular packing, crystallinity, and redshifted absorption. With a small molecule BSFTR as donor, the device of BSFTR:FO-EH-2Cl obtains a better morphology and achieves a higher power conversion efficiency (PCE) of 15.78% with a notable fill factor (FF) of 80.44% than that of the FO-2Cl-based device with a PCE of 15.27% and FF of 78.41%. To the authors’ knowledge, the FF of 80.44% is the highest value in ASM-OSCs. These results demonstrate a good example of fine-tuning the molecular structure to achieve suitable active layer morphology with promising performance for ASM-OSCs, which can provide valuable insight into material design for high-efficiency ASM-OSCs.
AB - Molecule engineering has been demonstrated as a valid strategy to adjust the active layer morphology in all-small-molecule organic solar cells (ASM-OSCs). In this work, two non-fullerene acceptors (NFAs), FO-2Cl and FO-EH-2Cl, with different alkyl side chains are reported and applied in ASC-OSCs. Compared with FO-2Cl, FO-EH-2Cl is designed by replacing the octyl alkyl chains with branched iso-octyl alkyl chains, leading to an enhanced molecular packing, crystallinity, and redshifted absorption. With a small molecule BSFTR as donor, the device of BSFTR:FO-EH-2Cl obtains a better morphology and achieves a higher power conversion efficiency (PCE) of 15.78% with a notable fill factor (FF) of 80.44% than that of the FO-2Cl-based device with a PCE of 15.27% and FF of 78.41%. To the authors’ knowledge, the FF of 80.44% is the highest value in ASM-OSCs. These results demonstrate a good example of fine-tuning the molecular structure to achieve suitable active layer morphology with promising performance for ASM-OSCs, which can provide valuable insight into material design for high-efficiency ASM-OSCs.
KW - alkyl side chains
KW - all-small-molecule organic solar cells
KW - fill factor
KW - non-fullerene acceptors
UR - https://www.scopus.com/pages/publications/85128583447
U2 - 10.1002/smll.202201400
DO - 10.1002/smll.202201400
M3 - 文章
C2 - 35451222
AN - SCOPUS:85128583447
SN - 1613-6810
VL - 18
JO - Small
JF - Small
IS - 21
M1 - 2201400
ER -