The Novel Photophysics of Halide Perovskites

Organic-inorganic halide perovskites are presently in the limelight because of their outstanding optoelectronic properties for applications ranging from photovoltaics, light emission, lasing and even radiation detection. Presently, the power conversion efficiencies of perovskite solar cells have exceeded 20% while the external quantum efficiencies perovskite light emitting diodes have breached the 10% mark. In this talk, I will review the photophysical mechanisms of the workhorse methylammonium lead halide (CH₃NH₃PbI₃) system. In addition, I will also present our latest photophysics results on (a) slow hot carrier cooling in perovskite nanocrystals [1]; (b) overcoming the slow bimolecular recombination in 3D perovskites [2]; and (c) giant five photon absorption in core-shell perovskite nanoparticles.

References

[1] M. J. Li, S. Bhaumik, T. W. Goh, M. S. Kumar, N. Yantara, M. Graetzel, S. G. Mhaisalkar, N. Mathews*, and T. C. Sum*, “Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals”, Nature Communications 8:14350 (DOI: 10.1038/ncomms14350) (2017)

[2] G. Xing, B. Wu, X. Wu, M. J. Li, B. Du, Q. Wei, J. Guo, E. K. L. Yeow, T. C. Sum* and W. Huang*, “Transcending the slow bimolecular recombination in lead-halide perovskites for electroluminescence”, Nature Communications 8:14558 (DOI: 10.1038/ncomms14558) (2017)