TY - JOUR
T1 - Tuning the Phase Separation by Thermal Annealing Enables High-Performance All-Small-Molecule Organic Solar Cells
AU - Meng, Lingxian
AU - Wu, Simin
AU - Wan, Xiangjian
AU - Shen, Zichao
AU - Li, Mengyang
AU - Yang, Yang
AU - Wang, Jian
AU - Lu, Guanghao
AU - Ma, Zaifei
AU - Yao, Zhaoyang
AU - Li, Chenxi
AU - Chen, Yongsheng
N1 - Publisher Copyright:
© 2022 The Authors. Published by American Chemical Society and Division of Chemical Education, Inc.
PY - 2022/4/12
Y1 - 2022/4/12
N2 - Tuning the phase separation within the active layer morphology is of great importance for enhancing the device performance of organic solar cells (OSCs), especially for all-small-molecule OSCs (ASM-OSCs). Herein, we demonstrate that an optimal phase separation could be achieved through thermal annealing (TA) for two small-molecule acceptors, F-2Cl- and FO-2Cl-based ASM-OSCs. The acceptor FO-2Cl, by introducing two oxygen atoms into the backbone of F-2Cl, exhibits red-shifted absorption, enhanced crystallinity, and improved electron mobility compared with F-2Cl. When using a small-molecule C8-C-F as the donor, the ASM-OSCs of F-2Cl- and FO-2Cl showed low power conversion efficiencies (PCEs) of 5.17 and 0.64%, respectively. However, with TA treatment, the PCEs of F-2Cl- and FO-2Cl-based devices were significantly improved to 12.15 and 13.91%, respectively. It was revealed that the TA treatment could effectively tune the phase separation of the active layer morphology with the interpenetrating network and contribute to the enhanced efficiency. Additionally, with TA treatment, the blend of C8-C-F:FO-2Cl demonstrated more favorable phase separation with higher crystallinity and stronger molecular packing compared with that of C8-C-F:F-2Cl. The results demonstrate that the phase separation of ASM-OSCs can be effectively tuned by TA treatment in combination with the delicate molecular design.
AB - Tuning the phase separation within the active layer morphology is of great importance for enhancing the device performance of organic solar cells (OSCs), especially for all-small-molecule OSCs (ASM-OSCs). Herein, we demonstrate that an optimal phase separation could be achieved through thermal annealing (TA) for two small-molecule acceptors, F-2Cl- and FO-2Cl-based ASM-OSCs. The acceptor FO-2Cl, by introducing two oxygen atoms into the backbone of F-2Cl, exhibits red-shifted absorption, enhanced crystallinity, and improved electron mobility compared with F-2Cl. When using a small-molecule C8-C-F as the donor, the ASM-OSCs of F-2Cl- and FO-2Cl showed low power conversion efficiencies (PCEs) of 5.17 and 0.64%, respectively. However, with TA treatment, the PCEs of F-2Cl- and FO-2Cl-based devices were significantly improved to 12.15 and 13.91%, respectively. It was revealed that the TA treatment could effectively tune the phase separation of the active layer morphology with the interpenetrating network and contribute to the enhanced efficiency. Additionally, with TA treatment, the blend of C8-C-F:FO-2Cl demonstrated more favorable phase separation with higher crystallinity and stronger molecular packing compared with that of C8-C-F:F-2Cl. The results demonstrate that the phase separation of ASM-OSCs can be effectively tuned by TA treatment in combination with the delicate molecular design.
UR - https://www.scopus.com/pages/publications/85127548455
U2 - 10.1021/acs.chemmater.1c04293
DO - 10.1021/acs.chemmater.1c04293
M3 - 文章
AN - SCOPUS:85127548455
SN - 0897-4756
VL - 34
SP - 3168
EP - 3177
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 7
ER -