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Media type:
E-Article
Title:
Ultrafast zero-bias photocurrent and terahertz emission in hybrid perovskites
Contributor:
Obraztsov, Petr A.;
Lyashenko, Dmitry;
Chizhov, Pavel A.;
Konishi, Kuniaki;
Nemoto, Natsuki;
Kuwata-Gonokami, Makoto;
Welch, Eric;
Obraztsov, Alexander N.;
Zakhidov, Alex
imprint:
Springer Science and Business Media LLC, 2018
Published in:Communications Physics
Language:
English
DOI:
10.1038/s42005-018-0013-8
ISSN:
2399-3650
Origination:
Footnote:
Description:
<jats:title>Abstract</jats:title><jats:p>Methylammonium lead iodide is a benchmark hybrid organic perovskite material used for low-cost printed solar cells with a power conversion efficiency of over 20%. Nevertheless, the nature of light–matter interaction in hybrid perovskites and the exact physical mechanism underlying device operation are currently debated. Here, we report room temperature, ultrafast photocurrent generation, and free-space terahertz emission from unbiased hybrid perovskites induced by femtosecond light pulses. The polarization dependence of the observed photoresponse is consistent with the bulk photovoltaic effect caused by a combination of injection and shift currents. Observation of this type of photocurrents sheds light on the low recombination and long carrier diffusion lengths arising from the indirect bandgap in CH<jats:sub>3</jats:sub>NH<jats:sub>3</jats:sub>PbI<jats:sub>3</jats:sub>. Naturally ballistic shift and injection photocurrents may enable third-generation perovskite solar cells with efficiency exceeding the Shockley–Queisser limit. The demonstrated control over photocurrents with light polarization also opens new venues toward perovskite spintronics and tunable THz devices.</jats:p>