Ultrafast zero-bias photocurrent and terahertz emission in hybrid perovskitesстатья
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Дата последнего поиска статьи во внешних источниках: 16 января 2019 г.
Аннотация: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
CH3NH3PbI3. 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.