Perovskite Hot Carrier Dynamics
Tze Chien Sum a
a Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
Invited Speaker, Tze Chien Sum, presentation 053
DOI: https://doi.org/10.29363/nanoge.iperop.2020.053
Publication date: 14th October 2019

solar cells, with efficiencies exceeding 22%, are presently the forerunner amongst the next generation photovoltaic technologies. However, in the past year, further efficiency improvements have decreased significantly. For any new efficiency breakthroughs, fresh perspectives and approaches must be developed. Recent discoveries of slow hot carrier cooling phenomenon in halide perovskites [1-3] revealed that such perovskites are highly promising hot-carrier absorber materials capable of unlocking disruptive high-efficiency hot-carrier photovoltaics to overcome the Shockley-Queisser limit. In this talk, I will trace the developments on the slow hot carrier cooling properties of halide perovskites beginning with the discovery of slow hot hole cooling in 2013. [1] Our group further uncovered that hot electrons cooling is slow as well and is relatively balanced with the hot holes. [4] I will also focus on our group’s efforts: (i) to further retard the hot carrier cooling using perovskite nanoparticles; (ii) to achieve efficient extraction of the hot carriers; [3] and (iii) to understand origins and mechanisms of slow hot-carrier cooling in halide perovskites [5]. Our latest findings in multiple exciton generation and hot carrier trapping dynamics will also be discussed.

References

G. C. Xing, N. Mathews, S. Sun, S. S. Lim, Y. M. Lam, M. Graetzel, S. Mhaisalkar and T. C. Sum*, “Long-Range Balanced Electron and Hole Transport Lengths in Organic-Inorganic CH3NH3PbI3”, Science, 342 (6156) 344-347 (2013),

Y. Yang, David P. Ostrowski, R. M. France, K. Zhu, J. van de Lagemaat, J. M. Luther & Matthew C. Beard, “Observation of a hot-phonon bottleneck in lead-iodide perovskites”, Nature Photonics 10, 53–59 (2016)

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 (2017)

T. C. Sum*, N. Mathews, G. Xing, S. S. Lim, W. K. Chong, D. Giovanni, H. A. Dewi, “Spectral Features and Charge Dynamics of Lead Halide Perovskites: Origins and Interpretations (Invited Article)”, Accounts of Chemical Research 49 (2) 294-302 (2016),

J. Fu, Q. Xu, G. Han, B. Wu, C. H. A. Huan, M. L. Leek & T. C. Sum*, “Hot carrier cooling mechanisms in halide perovskites”, Nature Commununications 8:1300 (2017)

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