4.6 Article

Reduction of Hole Carriers by van der Waals Contact for Enhanced Photoluminescence Quantum Yield in Two-Dimensional Tin Halide Perovskite

Journal

ACS ENERGY LETTERS
Volume 8, Issue 8, Pages 3536-3544

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.3c01195

Keywords

-

Ask authors/readers for more resources

In this study, it was demonstrated that the van der Waals contact of aluminum onto a two-dimensional tin halide perovskite significantly enhanced the photoluminescence intensity, reaching a record-high PL quantum yield of 10%. The study emphasizes the importance of controlling electronic doping to optimize luminescence efficiency in low-dimensional perovskites.
The role of electronicdoping in determining the luminescence efficiencyof low-dimensional halide perovskites has been challenging to testdue to the structural complexity resulting from conventional dopantuse. In this study, we demonstrate that van der Waals contact of aluminum(Al) onto a two-dimensional tin halide perovskite, phenethylammoniumtin iodide (PEA(2)SnI(4)), enhances photoluminescence(PL) intensity significantly, reaching a record-high PL quantum yieldof 10%. The intensity relies on the contact metal type and revertswhen the contact is released, demonstrating structural invariability.Ultraviolet photoemission spectroscopy reveals a 0.6 eV Fermi-levelupshift caused by the Al contact, indicating a reduced hole concentration.Incident power-dependence and time-resolved PL suggest trap-assistedrecombination as the primary nonradiative pathway. The Shockley-Read-Halltheory predicts suppression of trap-assisted recombination due toreduced free carrier concentration, providing a quantitative explanationfor our findings. Our study emphasizes the significance of controllingelectronic doping to optimize luminescence efficiency in low-dimensionalperovskites.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available