Verifying the Charge‐Transfer Mechanism in S‐Scheme Heterojunctions Using Femtosecond Transient Absorption Spectroscopy

Abstract The S‐scheme heterojunction is flourishing in photocatalysis because it concurrently realizes separated charge carriers and sufficient redox ability. Steady‐state charge transfer has been confirmed by other methods. However, an essential part, the transfer dynamics in S‐scheme heterojunctions, is still missing. To compensate, a series of cadmium sulfide/pyrene‐ alt ‐difluorinated benzothiadiazole heterojunctions were constructed and the photophysical processes were investigated with femtosecond transient absorption spectroscopy. Encouragingly, an interfacial charge‐transfer signal was detected in the spectra of the heterojunction, which provides solid evidence for S‐scheme charge transfer to…

• NN
  National Natural Science Foundation of China

  Award: 22238009, 51932007, 22278383, U1905215, 52073223, 52173065
• NS
  Natural Science Foundation of Hubei Province

  Award: 2022CFA001
• KT
  Key Technologies Research and Development Program

  Award: 2022YFB3803600 and 2018YFB1502001