Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.027
Publication date: 11th December 2017
Perovskite 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 hotcarrier 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]. Opportunities and challenges for hot-carrier perovskite photovoltaics will also be discussed.
References: [1] G. C. Xing et al., “Long-Range Balanced Electron and Hole Transport Lengths in Organic-Inorganic CH3NH3PbI3”, Science, 342,344-347 (2013),[2] Y. Yang et al., “Observation of a hot-phonon bottleneck in lead-iodide perovskites”, Nature Photonics 10, 53–59 (2016),[3] M. J. Li et al., “Slow Cooling and Highly Efficient Extraction of Hot Carriers in Colloidal Perovskite Nanocrystals”, Nature Communications 8 14350 (2017),[4] T. C. Sum et al., “Spectral Features and Charge Dynamics of Lead Halide Perovskites: Origins and Interpretations (Invited Article)”, Accounts of Chemical Research 49,294-302 (2016),[5] J. Fu et al., “Hot carrier cooling mechanisms in halide perovskites”, Nature Commununications 8:1300 (2017)
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