Publications by Nadja Isabelle Desiree Klipfel

Zn(II) and Cu(II) tetrakis(diarylamine)phthalocyanines as hole-transporting materials for perovskite solar cells

Mohammad Khaja Nazeeruddin, Kasparas Rakstys, Hiroyuki Kanda, Cansu Igci, Nadja Isabelle Desiree Klipfel, Maria Cristina Momblona Rincón, Jianxing Xia, Pavel Culik, Wei Li

Finding new hole-transporting materials (HTMs) suitable for replacing the state-of-the-art spiro-OMe-TAD is still challenging. In this work, newly synthesized diarylamine-substituted metal phthalocyanines (MPcs, M 1/4 Zn(II) or Cu(II)) functionalized with ...

ELSEVIER SCI LTD2022

Investigation in Crystal Growth/Morphology and Interface Engineering of Perovskite Solar Cells by Different Deposition Methods

Nadja Isabelle Desiree Klipfel

A new and promising technology has emerged to compete with traditional silicon photovoltaic semiconductors. The low material and processing costs and high-power conversion efficiencies of organic-inorganic metal halide perovskites make these a promising te ...

EPFL2022

Asymmetrically Substituted 10H,10 ' H-9,9 '-Spirobi[acridine] Derivatives as Hole-Transporting Materials for Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Paul Joseph Dyson, Yi Zhang, Hiroyuki Kanda, Nadja Isabelle Desiree Klipfel, Hobeom Kim, Bin Ding, Jianxing Xia

Hole-transporting materials (HTMs) based on the 10H, 10 ' H-9,9 '-spirobi [acridine] core (BSA50 and BSA51) were synthesized, and their electronic properties were explored. Experimental and theoretical studies show that the presence of rigid 3,6-dimethoxy- ...

Wiley-VCH Verlag GmbH2022

C-60 Thin Films in Perovskite Solar Cells: Efficient or Limiting Charge Transport Layer?

Mohammad Khaja Nazeeruddin, Cristina Roldán Carmona, Hiroyuki Kanda, Cansu Igci, Nadja Isabelle Desiree Klipfel, Albertus Adrian Sutanto, Maria Cristina Momblona Rincón

In this work, we identify the importance of C-60 and compact-TiO2 (cTiO(2)) as electron transport layers on the device performance of coevaporated n-i-p perovskite solar cells. We found (1) a synergetic effect between both layers when extracting the charge ...

AMER CHEMICAL SOC2022

Molecular Engineering of Fluorene-Based Hole-Transporting Materials for Efficient Perovskite Solar Cells

Keith Gregory Brooks, Mohammad Khaja Nazeeruddin, Hiroyuki Kanda, Nadja Isabelle Desiree Klipfel, Albertus Adrian Sutanto, Maria Cristina Momblona Rincón

New Spiro-OMeTAD analogues and the simpler "half" structures with the terminated methoxyphenyl and/or carbazolyl chromophores are successfully synthesized under Hartwig-Buchwald amination conditions using commercially available starting materials. New fluo ...

WILEY-V C H VERLAG GMBH2022

Tailoring electric dipole of hole-transporting material p-dopants for perovskite solar cells

Keith Gregory Brooks, Mohammad Khaja Nazeeruddin, Yi Zhang, Nadja Isabelle Desiree Klipfel, Jianxing Xia, Min Chen, Yu Shi

Li-TFSI/t-BP are the most widely employed p-dopants for hole-transporting materials (HTMs) within the state-of-the-art perovskite solar cells (PSCs). The hygroscopicity and migration of these dopants, however, lead to devices with limited stability. To sol ...

CELL PRESS2022

Structural and photophysical investigation of single-source evaporation of CsFAPbI(3) and FAPbI(3) perovskite thin films

Mohammad Khaja Nazeeruddin, Hiroyuki Kanda, Nadja Isabelle Desiree Klipfel, Albertus Adrian Sutanto, Maria Cristina Momblona Rincón

Thermal vacuum deposition is a stimulating technique for upscaling perovskite solar cells. However, the operational complexity of multisource vapor deposition (MSVD) and achieving stoichiometric perovskite layers may impede its implementation. The single-s ...

Royal Society of Chemistry2022

Subphthalocyanine-based electron-transport materials for perovskite solar cells

Mohammad Khaja Nazeeruddin, Hiroyuki Kanda, Nadja Isabelle Desiree Klipfel, Maria Cristina Momblona Rincón

Non-fullerene ETMs are emerging as a hot topic in the field of PSCs due to the inherent shortcomings of fullerene derivatives. Herein, the potential of SubPcs as ETMs in PSCs has been evaluated. To this end, ETMs based on two SubPcs (with chlorine or fluor ...

Royal Society of Chemistry2021

Mechanistic Insights into the Role of the Bis(trifluoromethanesulfonyl) imide Ion in Coevaporated p-i-n Perovskite Solar Cells

Klaus Leifer, Keith Gregory Brooks, Mohammad Khaja Nazeeruddin, Mounir Driss Mensi, Paul Joseph Dyson, Cristina Roldán Carmona, Hiroyuki Kanda, Cansu Igci, Nadja Isabelle Desiree Klipfel, Albertus Adrian Sutanto, Maria Cristina Momblona Rincón

Hybrid lead halide perovskites have reached comparable efficiencies to state-of-the-art silicon solar cell technologies. However, a remaining key challenge toward commercialization is the resolution of the perovskite device instability. In this work, we id ...

2021

Crystallographically Oriented Hybrid Perovskites via Thermal Vacuum Codeposition

Mohammad Khaja Nazeeruddin, Mounir Driss Mensi, Cristina Roldán Carmona, Hiroyuki Kanda, Nadja Isabelle Desiree Klipfel, Yen-Cheng Liu, Maria Cristina Momblona Rincón, Cheng Liu

Hybrid lead halide perovskites typically form polycrystalline films that have multiple grain sizes and surface defects. A key engineering challenge toward commercialization is therefore the production of homogeneous, defect-free largearea devices achieving ...

2021

Molecular Engineering of Thienyl Functionalized Ullazines as Hole-Transporting Materials for Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Paul Joseph Dyson, Yi Zhang, Hiroyuki Kanda, Cansu Igci, Nadja Isabelle Desiree Klipfel, Maria Cristina Momblona Rincón, Bin Ding

Organic hole-transporting materials (HTMs) based on the Ullazine core yield so far only moderate power conversion efficiencies of up to 13.08% in perovskite solar cells (PSCs). Aiming to fabricate efficient and stable PSCs, novel Ullazine derivatives beari ...

WILEY-V C H VERLAG GMBH2021

Gradient band structure: high performance perovskite solar cells using poly(bisphenol A anhydride-co-1,3-phenylenediamine)

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Cristina Roldán Carmona, Aron Joel Huckaba, Hiroyuki Kanda, Mousa Abdulla M E Abuhelaiqa, Nadja Isabelle Desiree Klipfel, Albertus Adrian Sutanto, Hobeom Kim, Maria Cristina Momblona Rincón, Ryuji Kaneko

Surface passivation is a critical factor for improving the photovoltaic performance of perovskite solar cells. However, more robust principle investigations are required to build effective passivation strategies enabling high-performance perovskite solar c ...

Royal Society of Chemistry2020

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

Mohammad Khaja Nazeeruddin, Mounir Driss Mensi, Valentin Ianis Emmanuel Queloz, Yonghui Lee, Kyung Taek Cho, Sanghyun Paek, Cristina Roldán Carmona, Aron Joel Huckaba, Giulia Grancini, Yi Zhang, Hiroyuki Kanda, Nadja Isabelle Desiree Klipfel, Mo Li

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