Screening in crystalline liquids protects energetic carriers in hybrid perovskites

Zhu H, Miyata K, Fu Y, Wang J, Joshi PP, Niesner D, Williams KW, Jin S, Zhu XY (2016)

Publication Language: English

Publication Status: Published

Publication Type: Journal article

Publication year: 2016

Journal

Science American Association for the Advancement of Science

Publisher: AMER ASSOC ADVANCEMENT SCIENCE

Book Volume: 353

Pages Range: 1409-1413

Journal Issue: 6306

DOI: 10.1126/science.aaf9570

Abstract

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)(2)PbBr3, and CsPbBr3. We observed hot fluorescence emission from energetic carriers with similar to 10(2)-picosecond lifetimes in CH3NH3PbBr3 or CH(NH2)(2)PbBr3, 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.

Authors with CRIS profile

Daniel Niesner Lehrstuhl für Festkörperphysik

Involved external institutions

University of Wisconsin - Madison US United States (USA) (US) Columbia University US United States (USA) (US)

How to cite

APA:

Zhu, H., Miyata, K., Fu, Y., Wang, J., Joshi, P.P., Niesner, D.,... Zhu, X.-Y. (2016). Screening in crystalline liquids protects energetic carriers in hybrid perovskites. Science, 353(6306), 1409-1413. https://doi.org/10.1126/science.aaf9570

MLA:

Zhu, Haiming, et al. "Screening in crystalline liquids protects energetic carriers in hybrid perovskites." Science 353.6306 (2016): 1409-1413.

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