Prolonging the carrier lifetime in lead-halide perovskite (LHP) can enable novel schemes for highly efficient energy-harvesting and photodetection applications. However, suppressing the recombination processes in LHP without chemical treatments remains an open challenge. Here we show that the recombination rate of three-dimensional LHP polycrystalline thin films can decrease significantly when placed on hyperbolic metamaterials. Through momentum-resolved imaging, we reveal that these LHP films possess a dominant in-plane transition dipole, which in turn is responsible for the decrease in the recombination rate. We observe a decrease in the recombination rate of a MAPbI3 LHP thin film by ~50% and 30% when placed on a plasmonic mirror and a hyperbolic metamaterial, respectively. Furthermore, we discover a tenfold decrease in the recombination rate of (Cs0.06FA0.79MA0.15)Pb(I0.85Br0.15)3, and the origin of this giant reduction in the recombination process is discussed based on exciton-trapping dynamics. By controlling the recombination rate of LHPs, we demonstrate a 250% increase in photoresponsivity of LHP-based photodetectors. The resulting physical insights will provide novel means to enhance the efficiency of LHP-based optoelectronic and photonic devices.
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This research was supported by the Bill and Melinda Gates Foundation, the Army Research Office, the National Science Foundation and the National Natural Science Foundation.
The authors declare no competing interests.
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Nature Photonics thanks Takashi Asano, Matthew Pelton and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Lee, K.J., Wei, R., Wang, Y. et al. Gigantic suppression of recombination rate in 3D lead-halide perovskites for enhanced photodetector performance. Nat. Photon. 17, 236–243 (2023). https://doi.org/10.1038/s41566-022-01151-3