Sanghyun Paek

Cette personne n’est plus à l’EPFL

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Publications associées (57)

Band-bending induced passivation: high performance and stable perovskite solar cells using a perhydropoly(silazane) precursor

Mohammad Khaja Nazeeruddin, Mounir Driss Mensi, Yi Zhang, Sanghyun Paek, Giulia Grancini, Yonghui Lee, Kyung Taek Cho, Cristina Roldán Carmona, Hiroyuki Kanda, Aron Joel Huckaba

Surface passivation of the perovskite photo absorber is a key factor to improve the photovoltaic performance. So far robust passivation strategies have not yet been revealed. Here, we demonstrate a successful passivation strategy which controls the Fermi-l ...

2020

Detection of voltage pulse width effect on charge accumulation in PSCs EFISHG measurement

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Zubair Ahmad

We report the effect of applied pulse width on charge accumulation in triple cation perovskite solar cells (PSCs) during the Electric Field Induced Second Harmonic Generation (EFISHG) measurements. The PSCs were prepared in the n-i-p structure using the la ...

ELSEVIER2020

Doped but Stable: Spirobisacridine Hole Transporting Materials for Hysteresis-Free and Stable Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Pascal Alexander Schouwink, Anne-Clémence Corminboeuf, Sanghyun Paek, Cristina Roldán Carmona, Albertus Adrian Sutanto, Hobeom Kim, Marius Franckevicius, Kun-Han Lin, Nikita Drigo

Four spirobisacridine (SBA) hole-transporting materials were synthesized and employed in perovskite solar cells (PSCs). The molecules bear electronically inert alkyl chains of different length and bulkiness, attached to in-plane N atoms of nearly orthogona ...

AMER CHEMICAL SOC2020

Enhanced stability of alpha-phase FAPbI(3) perovskite solar cells by insertion of 2D (PEA)(2)PbI4 nanosheets

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Tom Theodorus Antonius Lummen, Yi Zhang, Ruiyuan Hu

Methylammonium (MA) is one of the main obstacles that hold back the commercialization of perovskite solar cells (PSCs). Formamidinium (FA)-based perovskite is a promising photovoltaic material due to its higher thermal stability and smaller bandgap. Howeve ...

Royal Society of Chemistry2020

Effective Preparation of Nanoscale CH3NH3PbI3 Perovskite Photosensitizers for Mesoporous TiO2-Based Solar Cells by Successive Precursor Layer Adsorption and Reaction Process

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Iwan Zimmermann, Kyung Taek Cho, Yonghui Lee, Tom Theodorus Antonius Lummen, Aron Joel Huckaba, Hobeom Kim, So-Min Yoo

Nanoscale CH3NH3PbI3 perovskite sensitizers are grown by delivering each precursor successively onto the surface of mesoporous (meso) TiO2 electrodes. Using Pb(NO3)(2) ions as a lead(II) source and CH3NH3I (MAI) for methylammonium and iodide sources, repet ...

2020

Self-Crystallized Multifunctional 2D Perovskite for Efficient and Stable Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Yonghui Lee, Kyung Taek Cho, Aron Joel Huckaba, Valentin Ianis Emmanuel Queloz, Albertus Adrian Sutanto, Hobeom Kim

Recently, perovskite solar cells (PSC) with high power-conversion efficiency (PCE) and long-term stability have been achieved by employing 2D perovskite layers on 3D perovskite light absorbers. However, in-depth studies on the material and the interface be ...

WILEY-V C H VERLAG GMBH2020

Molecular Design and Operational Stability: Toward Stable 3D/2D Perovskite Interlayers

Mohammad Khaja Nazeeruddin, Pascal Alexander Schouwink, Anne-Clémence Corminboeuf, Sanghyun Paek, Kyung Taek Cho, Cristina Roldán Carmona, Hiroyuki Kanda, Marius Franckevicius, Hobeom Kim, Kun-Han Lin

Despite organic/inorganic lead halide perovskite solar cells becoming one of the most promising next-generation photovoltaic materials, instability under heat and light soaking remains unsolved. In this work, a highly hydrophobic cation, perfluorobenzylamm ...

2020

Dynamical evolution of the 2D/3D interface: a hidden driver behind perovskite solar cell instability

Mohammad Khaja Nazeeruddin, Pascal Alexander Schouwink, Sanghyun Paek, Giulia Grancini, Kyung Taek Cho, Valentin Ianis Emmanuel Queloz, Albertus Adrian Sutanto, Inés Garcia Benito, Nikita Drigo

Engineering two-/three-dimensional (2D/3D) perovskite solar cells is nowadays a popular strategy for efficient and stable devices. However, the exact function of the 2D/3D interface in controlling the long-term device behavior is still obscure. Here, we re ...

Royal Society of Chemistry2020

Crystal Orientation Drives the Interface Physics at Two/Three-Dimensional Hybrid Perovskites

Jacques-Edouard Moser, Mohammad Khaja Nazeeruddin, Sanghyun Paek, Giulia Grancini, Kyung Taek Cho, Cristina Roldán Carmona, Valentin Ianis Emmanuel Queloz, Marine Eva Fedora Bouduban

Combining halide perovskites with tailored dimensionality into two/three-dimensional (2D/3D) systems has revealed a powerful strategy to boost the performances of perovskite photovoltaics (PVs). Despite recent advances, a clear understanding of the intimat ...

2019

Stable perovskite solar cells using tin acetylacetonate based electron transporting layers

Mohammad Khaja Nazeeruddin, Emad Oveisi, Yi Zhang, Robin Humphry-Baker, Sanghyun Paek, Yonghui Lee, Kyung Taek Cho, Hiroyuki Kanda, Aron Joel Huckaba, Hobeom Kim

Organic-inorganic lead halide perovskites with over 23% power conversion efficiency have attracted enormous academic and industrial attention due to their low-cost fabrication and high device performance. Self-passivated tin oxide as an electron transport ...

ROYAL SOC CHEMISTRY2019

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Band-bending induced passivation: high performance and stable perovskite solar cells using a perhydropoly(silazane) precursor

Mohammad Khaja Nazeeruddin, Mounir Driss Mensi, Yi Zhang, Sanghyun Paek, Giulia Grancini, Yonghui Lee, Kyung Taek Cho, Cristina Roldán Carmona, Hiroyuki Kanda, Aron Joel Huckaba

2020

Effective Preparation of Nanoscale CH3NH3PbI3 Perovskite Photosensitizers for Mesoporous TiO2-Based Solar Cells by Successive Precursor Layer Adsorption and Reaction Process

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Iwan Zimmermann, Kyung Taek Cho, Yonghui Lee, Tom Theodorus Antonius Lummen, Aron Joel Huckaba, Hobeom Kim, So-Min Yoo

2020