期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 8, 页码 2278-2283出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201811610
关键词
carrier-phonon coupling; perovskites; hot-carrier cooling; nanocrystals; trapped state
资金
- National Natural Science Foundation of China [21833009, 21533010, 21525315]
- National Key Research and Development Program of China [2017YFA0204800]
- DICP [DMTO201601, ZZBS201703]
- Science Challenging Program [JCKY2016212A501]
A series of lead-free double perovskite nanocrystals (NCs) Cs2AgSb1-yBiyX6 (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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