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Defect-Dependent Nonlinear Absorption in the Lead-Free Double-Perovskite Cs2AgBiBr6.

Bingyue Li1, Hui Li1, Yanhui Sun1

  • 1School of Chemical Science and Engineering, Tongji University, Shanghai 200092, P. R. China.

ACS Applied Materials & Interfaces
|February 21, 2023
PubMed
Summary

Lead-free perovskites like Cs2AgBiBr6 show promising nonlinear optical properties. Pristine films exhibit reverse saturable absorption, while defective films display saturable absorption, offering tunable optical responses.

Keywords:
Cs2AgBiBr6double perovskitelead-freenonlinear opticalsaturable absorption

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid-State Physics

Background:

  • Lead-free perovskites are emerging as alternatives to lead-halide perovskites due to toxicity and stability concerns.
  • The nonlinear optical (NLO) properties of lead-free perovskites remain largely unexplored.
  • Cesium silver bismuth bromide (Cs2AgBiBr6) is a promising lead-free perovskite material.

Purpose of the Study:

  • To investigate the nonlinear optical (NLO) properties of lead-free Cs2AgBiBr6.
  • To explore the defect-dependent NLO behavior of Cs2AgBiBr6.
  • To evaluate the potential of Cs2AgBiBr6 for optical limiting applications.

Main Methods:

  • Thin film fabrication of pristine and defective Cs2AgBiBr6.
  • Nonlinear absorption measurements using 515 nm and 800 nm laser excitation.
  • Characterization of nonlinear optical coefficients and optical limiting thresholds.

Main Results:

  • Pristine Cs2AgBiBr6 films exhibit strong reverse saturable absorption (RSA) with coefficients up to 4.0 × 10^4 cm GW^-1.
  • Defective Cs2AgBiBr6 films (Cs2AgBiBr6(D)) show saturable absorption (SA) with coefficients down to -7.1 × 10^3 cm GW^-1.
  • Cs2AgBiBr6 demonstrates an optical limiting threshold of 8.1 × 10^-4 J cm^-2 at 515 nm and exhibits excellent air stability.

Conclusions:

  • Cs2AgBiBr6 possesses significant NLO responses.
  • Defect engineering in Cs2AgBiBr6 allows for tunable NLO behavior (RSA vs. SA).
  • Cs2AgBiBr6 is a promising candidate for optical limiting and other NLO applications.