Colloidal Synthesis and Charge‐Carrier Dynamics of Cs2AgSb1−yBiyX6 (X: Br, Cl; 0 ≤y ≤1) Double Perovskite Nanocrystals

Caught in a trap: A series of new double perovskite nanocrystals Cs₂AgSb_1−y Bi_y X₆ (X: Br, Cl; 0≤y≤1) is synthesized. Intrinsic self‐trapping (ca. 1–2 ps) arising from giant carrier–phonon scattering and surface‐defect trapping (ca. 50–100 ps) are revealed. Slow hot‐carrier cooling is observed at high pump fluence.

Abstract

A series of lead‐free double perovskite nanocrystals (NCs) Cs₂AgSb_1−y Bi_y X₆ (X: Br, Cl; 0≤y≤1) is synthesized. In particular, the Cs₂AgSbBr₆ NCs is a new double perovskite material that has not been reported for the bulk form. Mixed Ag–Sb/Bi NCs exhibit enhanced stability in colloidal solution compared to Ag–Bi or Ag–Sb NCs. Femtosecond transient absorption studies indicate the presence of two prominent fast trapping processes in the charge‐carrier relaxation. The two fast trapping processes are dominated by intrinsic self‐trapping (ca. 1–2 ps) arising from giant exciton–phonon coupling and surface‐defect trapping (ca. 50–100 ps). Slow hot‐carrier relaxation is observed at high pump fluence, and the possible mechanisms for the slow hot‐carrier relaxation are also discussed.

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