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Kyung Taek Cho

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Related publications (39)

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Perovskite Solar Cells: 18% Efficiency Using Zn(II) and Cu(II) Octakis(diarylamine)phthalocyanines as Hole-Transporting Materials

Mohammad Khaja Nazeeruddin, Hiroyuki Kanda, Sanghyun Paek, Kyung Taek Cho, Kasparas Rakstys, Valentin Ianis Emmanuel Queloz, Marius Franckevicius

Metallophthalocyanines (MPcs) are currently emerging as alternative hole-transporting materials (HTMs) in perovskite solar cells (PSCs). However, the lack of systematic structure/photovoltaic properties investigations still hampers the rational design of M ...

2019

Dopant-Free Hole-Transporting Materials for Stable and Efficient Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Christian Ludwig, Peng Gao, Emad Oveisi, Sanghyun Paek, Kyung Taek Cho, Kasparas Rakstys, Yonghui Lee, Paul Gratia, Peng Qin

Molecularly engineered novel dopant-free hole-transporting materials for perovskite solar cells (PSCs) combined with mixed-perovskite (FAPbI(3))(0.85)(MAPbBr(3))(0.15) (MA: CH3NH3+, FA: NH=CHNH3+) that exhibit an excellent power conversion efficiency of 18 ...

Wiley-V C H Verlag Gmbh2017

Molecularly Engineered Phthalocyanines as Hole-Transporting Materials in Perovskite Solar Cells Reaching Power Conversion Efficiency of 17.5%

Mohammad Khaja Nazeeruddin, Peng Gao, Giulia Grancini, Kyung Taek Cho, Cristina Roldán Carmona, Paul Gratia, Olga Trukhina

Easily accessible tetra-5-hexylthiophene-, tetra-5-hexyl-2,2'-bisthiophene-substituted zinc phthalocyanines (ZnPcs) and tetra-tert-Bu ZnPc are employed as hole-transporting materials in mixed-ion perovskite [HC(NH2)2]0.85(CH3NH3)0.15Pb(I0.8 ...

2017

Stability in 3D and 2D/3D hybrid perovskite solar cells studied by EFISHG and IS techniques under light and heat soaking

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Kyung Taek Cho

We investigate the effect of temperature and light soaking on the stability and charge carrier behavior in triple cation 3-Dimensional (3D) and 2-Dimensional (2D)/3-Dimensional perovskite solar cells (PSCs) using electric field induced second harmonic gene ...

ELSEVIER SCIENCE BV2019

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

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

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

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

Enhanced charge collection with passivation of the tin oxide layer in planar perovskite solar cells

Yi Zhang, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Peng Gao, Emad Oveisi, Sanghyun Paek, Yonghui Lee, Kyung Taek Cho

Tin oxide is an excellent candidate to replace mesoporous TiO2 electron transport layers (ETLs) in perovskite solar cells. Here, we introduced a SnO2 layer by a low-temperature solution process, and investigated its morphology, opto-physical and electrical ...

Royal Society of Chemistry2017

Diphenylamine-Substituted Carbazole-Based Hole Transporting Materials for Perovskite Solar Cells: Influence of Isomeric Derivatives

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Kyung Taek Cho, Kasparas Rakstys, Paul Gratia

2018

Enhanced Charge Collection with Passivation Layers in Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Peng Gao, Jingshan Luo, Kyung Taek Cho, Yonghui Lee, Jiyoun Seo, Minkyu Son

The Al2O3 passivation layer is beneficial for mesoporous TiO2-based perovskite solar cells when it is deposited selectively on the compact TiO2 surface. Such a passivation layer suppressing surface recombination can be formed by thermal decomposition of th ...

Wiley-V C H Verlag Gmbh2016

Hysteresis-Free Lead-Free Double-Perovskite Solar Cells by Interface Engineering

Mohammad Khaja Nazeeruddin, Giulia Grancini, Kyung Taek Cho, Valentin Ianis Emmanuel Queloz

2018

Stable perovskite solar cells using tin acetylacetonate based electron transporting layers

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

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

Unsymmetrical and Symmetrical Zn(II) Phthalocyanines as Hole-Transporting Materials for Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Yi Zhang, Sanghyun Paek, Iwan Zimmermann, Kyung Taek Cho

2018

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

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

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

Selective growth of layered perovskites for stable and efficient photovoltaics

Manuel Tschumi, Mohammad Khaja Nazeeruddin, Emad Oveisi, Giulia Grancini, Sanghyun Paek, Pascal Alexander Schouwink, Kyung Taek Cho, Yonghui Lee

Perovskite solar cells (PSCs) are promising alternatives toward clean energy because of their high-power conversion efficiency (PCE) and low materials and processing cost. However, their poor stability under operation still limits their practical applicati ...

2018

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

Mohammad Khaja Nazeeruddin, Jacques-Edouard Moser, Giulia Grancini, Sanghyun Paek, 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

A highly hindered bithiophene-functionalized dispiro-oxepine derivative as an efficient hole transporting material for perovskite solar cells

Mohammad Khaja Nazeeruddin, Peng Gao, Sanghyun Paek, Yonghui Lee, Kyung Taek Cho, Kasparas Rakstys, Paul Gratia

Dimethoxydiphenylamine-substituted dispiro-oxepine derivative 2,2',7,7'-tetrakis-(N,N'-di-4-methoxyphenylamine)dispiro-[fluorene-9,4'-dithieno(3,2-c:2',3'-e]oxepine-6',9 ''-fluorene] (DDOF) has been designed and synthesized using a facile synthetic route. ...

Royal Society of Chemistry2016

Carbazole-based enamine: Low-cost and efficient hole transporting material for perovskite solar cells

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Kyung Taek Cho, Kasparas Rakstys

A simple carbazole-based conjugated enamine V950 was synthesized, fully characterized and incorporated into a perovskite solar cell, which displayed high power conversion efficiency close to 18%. The investigated hole transporting material was synthesize ...

Elsevier Science Bv2017

Ionic dipolar switching hinders charge collection in perovskite solar cells with normal and inverted hysteresis

Mohammad Khaja Nazeeruddin, Tom Theodorus Antonius Lummen, Kyung Taek Cho, Iwan Zimmermann, Sadig Aghazada

Drift-diffusion modeling of the ionic dipole switching from the measurement of fast scanned and long pre-biased electrical response is proposed as a novel protocol for evaluation of limit hysteretic effects in perovskite solar cells. Up to eight systems we ...

2019

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

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

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