Prof. William Jo Profile

Prof. William Jo

Professor at Ewha Womans Univ

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Publications (2)

Proceedings Article | 1 August 2021 Poster + Presentation

The impact of surface chemistry in SnO2 on charge transport of lead halide perovskite solar cells

Sarah Youn, William Jo, Gee Yeong Kim

Proceedings Volume 11809, 1180919 (2021) https://doi.org/10.1117/12.2594524

KEYWORDS: Perovskite, Solar cells, Lead, Chemistry, Titanium dioxide, Oxides, Interfaces, Optical properties, Ions, External quantum efficiency

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Organic-inorganic lead halide perovskites have high power conversion efficiency and intriguing physical-chemical aspects that attract attention of the photovoltaic community. Methylammonium lead iodide (MAPI) is an archetypal material for lead halide perovskites and mixed electronic and ionic conductor. In order to investigate the key features of its performance, we have to consider the electronic transport as well as ionic transport properties. In previous study about perovskite interface, ions are responsible for the equilibrium space charge potential due to ion adsorption at the contact area between MAPI and oxide layers. The surface chemistry of oxide (TiO₂ and Al₂O₃) and its interaction with perovskite plays an important role in charge transport in perovskite solar cells. From the perovskite solar cell structure, TiO₂ electron transport layer is being replaced by SnO₂ because of its excellent electrical and optical properties and low-temperature process. Nevertheless, the interfacial effect on charge transport between SnO₂ and MAPI is not well identified. In this study, we investigate the surface chemistry of oxides (SnO₂ and TiO₂) and interface effects between MAPI and oxide layers. We also observed the interaction between SnO₂ and MAPI by using UV-Vis spectroscopy, ICP, XPS and compared it with TiO₂. Additionally, we measured the conductivity to understand the charge transport properties by controlling the contact area of MAPI and SnO₂ interface. To optimize the charge transfer in SnO₂ based solar cell, a comparison between compact SnO₂ layer (prepared by ALD) and composite layer (prepared by spin coating) by using various measurements including external quantum efficiency (EQE) and photoluminescence (PL) was also provided. These physical and optical properties were extended to perovskite solar cells which give us evidence on charge extraction and recombination. Our work will provide a better physical understanding of the perovskite solar cell system.

Proceedings Article | 26 September 2016 Paper

Oxygen-vacancy driven tunnelling spintronics across MgO

U. Halisdemir, F. Schleicher, D. J. Kim, B. Taudul, D. Lacour, W. S. Choi, M. Gallart, S. Boukari, G. Schmerber, V. Davesne, P. Panissod, D. Halley, H. Majjad, Y. Henry, B. Leconte, A. Boulard, D. Spor, N. Beyer, C. Kieber, E. Sternitzky, O. Cregut, M. Ziegler, F. Montaigne, J. Arabski, E. Beaurepaire, W. Jo, M. Alouani, P. Gilliot, M. Hehn, M. Bowen

Proceedings Volume 9931, 99310H (2016) https://doi.org/10.1117/12.2239017

KEYWORDS: Spintronics, Oxygen, Magnetism, Absorption, Electrodes, Spintronics, Luminescence, Electrons, Interfaces, Annealing, Dielectrics

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