Screening in crystalline liquids protects energetic carriers in hybrid perovskites

Haiming Zhu, Kiyoshi Miyata, Yongping Fu, Jue Wang, Prakriti P. Joshi, Daniel Niesner, Kristopher W. Williams, Song Jin, X. Y. Zhu

Research output: Contribution to journalArticlepeer-review

637 Citations (Scopus)


Hybrid lead halide perovskites exhibit carrier properties that resemble those of pristine nonpolar semiconductors despite static and dynamic disorder, but how carriers are protected from efficient scattering with charged defects and optical phonons is unknown. Here, we reveal the carrier protection mechanism by comparing three single-crystal lead bromide perovskites: CH3NH3PbBr3, CH(NH2)2PbBr3, and CsPbBr3.We observed hot fluorescence emission from energetic carriers with ~102 picosecond lifetimes in CH3NH3PbBr3 or CH(NH2)2PbBr3, but not in CsPbBr3.The hot fluorescence is correlated with liquid-like molecular reorientational motions, suggesting that dynamic screening protects energetic carriers via solvation or large polaron formation on time scales competitive with that of ultrafast cooling. Similar protections likely exist for band-edge carriers.The long-lived energetic carriers may enable hot-carrier solar cells with efficiencies exceeding the Shockley-Queisser limit.

Original languageEnglish
Pages (from-to)1409-1413
Number of pages5
Issue number6306
Publication statusPublished - Sept 23 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General


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