Kasparas Rakstys

Cette personne n’est plus à l’EPFL

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Publications associées (36)

Carbazole-Terminated Isomeric Hole-Transporting Materials for Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Kasparas Rakstys, Hiroyuki Kanda

A set of novel hole-transporting materials (HTMs) based on pi-extension through carbazole units was designed and synthesized via a facile synthetic procedure. The impact of isomeric structural linking on their optical, thermal, electrophysical, and photovo ...

AMER CHEMICAL SOC2020

D-pi-A-Type Triazatruxene-Based Dopant-Free Hole Transporting Materials for Efficient and Stable Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Cristina Roldán Carmona, Kasparas Rakstys, Hiroyuki Kanda, Hobeom Kim, Cansu Igci

Three donor-pi-bridge-acceptor (D-pi-A)-type organic small molecules coded CI-B1, CI-B2, and CI-B3 are designed, synthesized, and used as dopant-free hole transporting materials (HTMs) for perovskite solar cells (PSCs). The strong electron-donating triazat ...

WILEY-V C H VERLAG GMBH2020

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

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

In-situ cross-linkable hole transporting triazatruxene monomers for optoelectronic devicestr

Mohammad Khaja Nazeeruddin, Kasparas Rakstys, Aron Joel Huckaba, Tom Theodorus Antonius Lummen

The invention discloses a polymerizable triazatruxene-based compound of formula (I), an optoelectronic and/or photoelectrochemical device comprising said compound of formula (I) as hole transporting material in hole transport layer under the form of a poly ...

2019

Efficiency vs. stability: dopant-free hole transporting materials towards stabilized perovskite solar cells

Mohammad Khaja Nazeeruddin, Kasparas Rakstys, Cansu Igci

In the last decade, perovskite solar cells have been considered a promising and burgeoning technology for solar energy conversion with a power conversion efficiency currently exceeding 24%. However, although perovskite solar cells have achieved high power ...

ROYAL SOC CHEMISTRY2019

Hole transporting organic molecules containing enamine groups for optoelectronic and photoelectrochemical devices

Sanghyun Paek, Kasparas Rakstys

The present invention relates to a compound of formula (I) based on enamine derivatives and used as organic hole conductors or hole transporting material in an optoelectronic or photoelectrochemical device. The present invention relates to the hole transpo ...

2018

Pyridination of hole transporting material in perovskite solar cells questions the long-term stability

Mohammad Khaja Nazeeruddin, Natalia Gasilova, Sanghyun Paek, Kasparas Rakstys

In this work, for the first time, reactive radical-cation species present in hole-transporting materials were shown to react with tert-butylpyridine additive, routinely used in hole transporting layer composition. As a result, new pyridinated products were ...

Royal Society of Chemistry2018

Dispiro-oxepine/thiapine derivatives for optoelectronic semiconductors

Mohammad Khaja Nazeeruddin, Kasparas Rakstys, Sanghyun Paek, Muhammad Sohail

The dispiro-oxepine/dispiro-thiapine derivatives for optoelectronic semiconductors is a compound based on a structure having a functionalized dispiro compound of formula (Ia) or (Ib) with the core unit being a seven-membered heterocycle oxepine or thiapine ...

2018

Solution processed organic light-emitting diodes using a triazatruxene crosslinkable hole transporting material

Mohammad Khaja Nazeeruddin, Kasparas Rakstys

2018

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

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

2018

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D-pi-A-Type Triazatruxene-Based Dopant-Free Hole Transporting Materials for Efficient and Stable Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Sanghyun Paek, Cristina Roldán Carmona, Kasparas Rakstys, Hiroyuki Kanda, Hobeom Kim, Cansu Igci

WILEY-V C H VERLAG GMBH2020

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

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

2019

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

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

2018