Fig. 4: Charge transfer kinetics and energy band structure.

a The η_tran. b The K_tran. c The K_rec. d TRPL decay spectra of ZIS, ZISZ, and ZISZ/Fe (the inset is calculated carrier lifetime). e The energy level diagram of ZISZ/Fe with different etching depth obtained from UPS results (Ec: conduction band; Ev: valence band).