Effects of Heteroatom Substitution on Nonfullerene Acceptors in Organic Solar Cells and Toxicity Assessment
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Organic conjugation materials play an important role in the development of perovskites and organic solar cells. Among the various molecular design strategies, the introduction of selenium is an efficient way to optimize material properties and improve the performance of organic solar cells (OSCs). Selenium-containing photoactive materials can reduce optical band spacing due to low lowest unoccupied molecular orbital energy levels, which can improve short-circuit current density and further improve the power conversion efficiency of OSCs. In this work, we synthesized a simple small molecule acceptor, in which bithiophene core was replaced with a biselenophene core. The effects of selenophene replacement on UV-vis absorption, charge mobility, molecular packing, and device performance were investigated.