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Yonghui Lee

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Related publications (39)

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Inkjet-Printed Mesoporous TiO2 and Perovskite Layers for High Efficiency Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Paul Joseph Dyson, Hubert Girault, Emad Oveisi, Andreas Stephan Lesch, Sanghyun Paek, Yonghui Lee, Aron Joel Huckaba, Victor Costa Bassetto

Perovskite solar cells with mesoporous TiO2 electron transport layers have previously reached >22 % efficiency at the laboratory scale (

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

Efficient Perovskite Solar Cells with 13.63% Efficiency Based on Planar Triphenylamine Hole Conductors

Mohammad Khaja Nazeeruddin, Yonghui Lee, Sanghyun Paek

A new type of hole transporting material (HTMs) with an incorporated planar amine or triphenylamine as a core unit have been prepared. The two amine derivatives were demonstrated to be efficient hole transporting materials in fabricating solid-state organi ...

Wiley-Blackwell2014

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

Strong Photocurrent Amplification in Perovskite Solar Cells with a Porous TiO2 Blocking Layer under Reverse Bias

Michael Graetzel, Mohammad Khaja Nazeeruddin, Shaik Mohammed Zakeeruddin, Mohammad Ibrahim Dar, Thomas Moehl, Fabrizio Giordano, Yonghui Lee, Konrad Domanski, Leo-Philipp Heiniger, Jeong-Hyeok Im

We investigate two different types of TiO2 blocking layer (BL) deposition techniques commonly used in solid-state methylammonium lead triiodide perovskite (MaPbI(3))-based solar cells. Although these BLs lead to similar photovoltaic device performance, the ...

Amer Chemical Soc2014

Intrinsic Halide Segregation at Nanometer Scale Determines the High Efficiency of Mixed Cation/Mixed Halide Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Kevin Sivula, Iwan Zimmermann, Giulia Grancini, Yonghui Lee, Paul Gratia, Xavier Adrian Jeanbourquin

Compositional engineering of a mixed cation/mixed halide perovskite in the form of (FAP-bI(3))(0.85)(MAPbBr(3))(0.15) is one of the most effective strategies to obtain record-efficiency perovskite solar cells. However, the perovskite self-organization upon ...

2016

Improved environmental stability of organic lead trihalide perovskite-based photoactive-layers in the presence of mesoporous TiO2

Michael Graetzel, Mohammad Khaja Nazeeruddin, Yonghui Lee

Impressive hybrid photovoltaic device performances have been realised with the methylammonium lead triiodide (MAPbI(3)) perovskite absorber in a wide range of device architectures. However, the question as to which of these systems represents the most comm ...

Royal Society of Chemistry2015

Low-Cost TiS2 as Hole-Transport Material for Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Giulia Grancini, Yonghui Lee, Cristina Roldán Carmona, Aron Joel Huckaba, Saba Gharibzadeh

2018

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

Unraveling the Reasons for Efficiency Loss in Perovskite Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Robin Humphry-Baker, Peng Gao, Jingshan Luo, Peng Gao, Yonghui Lee

The effect of the presence of unreacted PbI2 on the perovskite solar cells efficiency is reported. N,N-Dimethylformamide vapor treatment is introduced to study the influence of complete conversion to a power conversion efficiency of the device. It is disco ...

Wiley-Blackwell2015

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

Beneficial Role of Reduced Graphene Oxide for Electron Extraction in Highly Efficient Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Giulia Grancini, Yonghui Lee, Kyung Taek Cho

In this work we systematically investigated the role of reduced graphene oxide (rGO) in hybrid perovskite solar cells (PSCs). By mixing rGO within the mesoporous TiO2 (m-TiO2) matrix, highly efficient solar cells with power conversion efficiency values up ...

Wiley-VCH Verlag Berlin2016

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

Influence of Charge Transport Layers on Open-Circuit Voltage and Hysteresis in Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Giulia Grancini, Yonghui Lee, Cristina Roldán Carmona, Saba Gharibzadeh

2018

High-Performance Nanostructured Inorganic-Organic Heterojunction Solar Cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Yonghui Lee

We report all solid-state nanostructured inorganic-organic heterojuncuon solar cells fabricated by depositing Sb2S3 and poly(3-hexylthiophene) (P3HT) on the surface of a mesoporous TiO2 layer, where Sb2S3 acts as an absorbing semiconductor and P3HT acts as ...

American Chemical Society2010

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

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

Hole-conducting mediator for stable Sb2S3-sensitized photoelectrochemical solar cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Yonghui Lee

Iodide redox (3I(-)/I-3(-)), polysulfide redox (S2-/S-x(2-)), organic redox [TMTU/TMFDS2+: tetramethylthiourea/tetramethylformaminium-bis(trifluoromethanesulfonyl) imide], ferrocene redox (Fc/Fc(+)), nickel redox [Ni(II)/Ni(III)], and cobalt redox [Co(II)/ ...

Royal Society of Chemistry2012

Charge Transfer Dynamics from Organometal Halide Perovskite to Polymeric Hole Transport Materials in Hybrid Solar Cells

Mohammad Khaja Nazeeruddin, Natalie Renuka Banerji, Yonghui Lee, Jan Cornelius Brauer

Organometal halide perovskites have emerged as promising next-generation solar cell technologies presenting outstanding efficiencies. However, many questions concerning their working principles remain to be answered. Here, we present a detailed study of ho ...

Amer Chemical Soc2015