Tae-Hee Han

Tae-Hee Han is an assistant professor in Division of Materials Science and Engineering,Hanyang University, Republic of Korea. He received his B.S. (February2010) and Ph.D. (Feburuary 2015) in Materials Science and Engineering fromPohang University of Science and Technology (POSTECH), Republic of Korea. Hewas a postdoctoral researcher in Prof. Yang Yang`s group in University ofCalifornia Los Angeles (UCLA) (2017-2019). His research focuses on organic and organic/ inorganichybrid materials for optoelectronic applications, such as photovoltaic cells,and light-emitting diodes.

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Defect Management for Metal Halide Perovskite Optoelectronic Devices

Tae-Hee Han¹

¹ Division of Materials Science and Engineering, HanyangUniversity, Korea

The family of metal halide perovskites have proven to be an excellent material for solar cells and light emitting diodes. Low temperature and solution-based fabrication process of perovskites are also big advantages for low-cost production. The solution processed metal halide perovskite films are polycrystalline in nature, and the polycrystalline perovskite thin films inevitably possesses many grain boundaries with structural disorders and traps.The crystalline defects and grain boundaries in the polycrystalline thin films have significant impact on both optoelectronic properties of photoactive materialsand stability of the perovskite thin film and devices. Furthermore, the defective surface and grain boundaries are vulnerable against environmental species such as oxygen and moisture, which results in poor operational stability of the solar cells and light-emitting diodes. Here, we present the management strategiesof grains surface and grain boundaries in perovskite thin film by manipulating crystalnucleation and growth of solution-processed perovskite thin film. The effective mitigation of such defective grain boundaries results in significantly reduced charged trap densities, environmental stability, and ion migration of the perovskite thinfilm, showing much improved operational stability in solar cells and light-emitting diodes.