期刊
DYES AND PIGMENTS
卷 216, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2023.111343
关键词
Donor-acceptor molecules; Star -shaped molecules; Triazatruxene; All -small -molecules organic solar cells; Scanning near -field infrared microscopy
The recent success in the development of non-fullerene acceptors (NFAs) for organic solar cells (OSCs) has led to a search for efficient and complementary donor materials. Understanding the structure-property correlations for new generations of acceptor and donor materials is crucial for advancing the field of OSCs. This study reports the synthesis and investigation of star-shaped small molecules based on benzotriindole (BTI) as potential donor materials for NF OSCs.
The recent success in the development of non-fullerene acceptors (NFAs) for organic solar cells (OSCs) encourages the search for novel efficient and complementary donor materials. Moreover, the in-depth understanding of the structure-property correlations for new generations of acceptor and donor materials is of great importance for the further progress in the field of OSCs. In this work the synthesis of a series of star-shaped small molecules based on benzotriindole (BTI) electron-donating core linked through bi- or terthiophene pi-spacers to either hexyl dicyanovinyl or 2-ethylhexyl cyanoacetate electron-withdrawing terminal groups (EWGs) is reported. The thermal, optical and electrochemical properties of the molecules were carefully investigated and compared. The molecules were also explored as donor materials in non-fullerene (NF) OSCs in binary blends with well-known NFAs such as IDIC or Y6. The huge impact of the donor molecular structure on the device performance (up to 6 times difference in power conversion efficiency (PCE)) was evaluated due to significant difference in the active layer morphologies, which was successfully proved via scanning near-field infrared microscopy technique. The results obtained in this work demonstrate high potential of star-shaped BTI-based molecules to be used as donor materials with a new generation of NFAs and can be used for further molecular design of the highly efficient small molecule donors for NF OSCs.
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