Metal-Halide Perovskite Nanocrystals: Unlocking Size Dependent Effects for High Performance Solar Cells and Light-Emitting Devices
subodh Mhaisalkar a
a NTU Singapore - Nanyang Technological University, Materials Science and Engineering, Singapore
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Kitakyūshū-shi, Japan, 2018 January 28th - 30th
Organizers: Shuzi Hayase, Juan Bisquert and Hiroshi Segawa
Invited Speaker, subodh Mhaisalkar, presentation 114
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.114
Publication date: 27th October 2017

The past five years have witnessed remarkable advances in the field of solar cells and light-emitting devices with the perovskite metal halide, CH3NH3PbI3, and related family of materials. These semiconductors form nearly defect free, crystalline films at low temperatures that exhibit high optical absorption, long-range charge transport, and efficient charge collection, yielding high performance LEDs and solar cells. The prospects for advancing device efficiencies are contingent upon exploring new perovskite compositions and structures. One such structural variant is represented by lower-dimensionality layered perovskite derived from their 3D counterparts (ABX3) by increasing the distance between the interconnected inorganic sheets with the appropriate organic cations. Lower-dimensionality layered perovskites formulations permit for band gaps and exciton binding energy tuning, carrier mobility facilitated by the inorganic moeities, with the organic moieties providing additional controls for stability, light harvesting, and intralayer charge transport. Nanocrystals is yet another variant in perovskites that promises to yield new opportunities in advancing device performance. Perovskites are typically synthesised via wet-chemistry routes, allowing for mixing at a molecular level, and resulting in materials with high phase purity. By carefully controlling the reaction conditions such as temperature, solvent, and ligands, hybrid perovskites of morphologies ranging from 0D quantum dots to 3D single crystals; and sizes stretching 6 orders of magnitude can be prepared. This presentation will outline a broad palette of elemental substitutions, solid solutions, and multidimensional families that will provide the next step towards the advances of the perovskite solar cells and light-emitting devices. Challenges and opportunities in perovskite materials beyond methyl ammonium lead iodide, with emphasis on their recombination dynamics, optoelectronic properties, and integration into solar cells and light-emitting devices, will also be addressed.

References: (1) Chen, W. et al. "Giant five-photon absorption from multidimensional core-shell halide perovskite colloidal nanocrystals”, Nature Communications, 8: 15198, 2017. (2) Li, MJ. et al. "Slow cooling and highly efficient extraction of hot carriers in colloidal perovskite nanocrystals", Nature Communications, 8: 14350, 2017. (3)           Veldhuis SA. et al. Perovskite Materials for Light-Emitting Diodes and Lasers, Advanced Materials, 28(32): 6804-6834, 2016. (4) GC Xing et al. Low-Temperature Solution-Processed Wide Wavelength Tunable Perovskites for Lasing, Nature Materials, 13, 5, 476-480, 2014. (5) Xing, GC. et al. Long-Range Balanced Electron- and Hole-Transport Lengths in Organic-Inorganic CH3NH3PbI3; Science; 342(6156)344-347; 2013 

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