Congratulations to the team of Academicians Meng Lei and Li Yongfang from the Institute of Chemistry, Chinese Academy of Sciences for publishing the latest literature in the international journal Energy&Environmental Science: The Effect of Thiophene External Chain Alkyl Substitution Position on the Photovoltaic Performance of A-DA'D-A Type Receptors.

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The side chain configuration has a significant impact on the intermolecular interactions and aggregation morphology of organic small molecule receptors (SMAs). In this work, the Li Yongfang&Meng Lei team designed and synthesized two A-DA'D-A isomers of SMAs, introducing thiophene based outer chains with 2-ethylhexyl substitution at the α - or β - position (named o-TEH and m-TEH, respectively), and studied the effects of thiophene based conjugated outer chains and alkyl substitution positions on the properties of SMAs. Compared with alpha substituted o-TEH, beta substituted m-TEH has a closer π - π stacking, stronger intermolecular interactions, and higher electron mobility.

In addition, compared with the PBQ6: o-TEH blend film, the blend film of m-THE and PBQ6 polymer donor has more suitable phase separation, enhanced molecular stacking, higher and more balanced hole and electron mobility, longer charge carrier lifetime, and less charge carrier recombination. The power conversion efficiency (PCE) of organic solar cells (OSCs) based on PBQ6: m-TEH reaches 18.51%, significantly higher than the PCE of OSCs based on PBQ6: o-TEH (16.22%). So far, 18.51% is one of the highest reported power conversion efficiencies PCE in binary organic solar cell OSCs, indicating that m-TEH is an excellent SMA for organic solar cells.

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