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Molecular Foundry

HIGHLIGHTQuantum Confined Ultrathin CsSnI3 2D Nanoplates
March 28, 2018

(a) Crystal structure of room-temperature orthorhombic, black CsSnI3 with Cs (green), Sn (grey), I (red) atoms, Sn-I octahedra (purple). (b) Low-resolution TEM image of CsSnI3 nanoplates. (c) Photoluminescence (PL) spectra of quantum-confined CsSnI3 nanoplates (black) and bulk CsSnI3 (red). Insets show VSn defect level and synthesis. (d) Experimental TRPL measurements of CsSnI3 nanoplates with (black) and without (blue) treatment with SnI2 complexes as well as bulk CsSnI3 (red). Solid lines are fits to the data.

Scientific Achievement

Developed the synthesis of CsSnI3 lead-free halide perovskite nanoplates while developing understanding of the stability of CsSnI3

Significance and Impact

This approach advances the understanding of the synthesis and the management of instability and defects in CsSnI3

Research Details

  • First synthesis of strongly quantum confined CsSnI3 nanoplates was achieved by hot-injection in Sn-rich conditions
  • Ab initio calculations (GGA-PBE) highlight that synthesizing and processing CsSnI3 in Sn-rich conditions can reduce defect density and increase stability
  • Experimentally, treatment with Sn-rich conditions increases carrier lifetime.
A. B. Wong, Y. Bekenstein*, J. Kang, C. Kley, D. Kim, N. A. Gibson, D. Zhang, Y. Yu, S. R. Leone, L. W. Wang, A. P. Alivisatos, P. Yang, Nano Lett., (2018) 18 (3), 2060–2066

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