In Situ Construction of a Cs 2 SnI 6 Perovskite Nanocrystal/SnS 2 Nanosheet Heterojunction with Boosted Interfacial Charge Transfer

Heterojunction engineering has played an indispensable role in the exploitation of innovative artificial materials with exceptional properties and has consequently triggered a new revolution in achieving high-performance optoelectronic devices. Herein, an intriguing halide perovskite (PVK) and metal dichalcogenide (MD) heterojunction, i.e., a lead-free Cs2SnI6 perovskite nanocrystal/SnS2 nanosheet hybrid, was fabricated in situ for the first time. Comprehensive investigations with experimental characterizations and theoretical calculations demonstrate that cosharing of the Sn atom enables intimate contact in the Cs2SnI6/SnS2 hybrid together with a type II band alignment structure. Additionally, ultrafast…

• NN
  National Natural Science Foundation of China

  Awards: 21875288, 21802172
• MO
  Ministry of Education of the People's Republic of China
• NS
  Natural Science Foundation of Guangdong Province

  Award: 2018A030313009
• FR
  Fundamental Research Funds for the Central Universities