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Kevin Sivula

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Related publications (165)

Semiconducting alternating multi-block copolymers via a di-functionalized macromonomer approach

Kevin Sivula, Xavier Adrian Jeanbourquin, Andrea Gasperini, Muhammad Aiman Bin Rahmanudin Hamdan, Nestor Guijarro Carratala, Liang Yao

The development of fully-conjugated semiconducting block-copolymers is an important goal for organic electronics, but to date has been almost exclusively limited to materials containing poly(3-alkylthiophenes). Here we present the prototype of a class of f ...

2017

CuInGaS2 photocathodes treated with SbX3 (X = Cl, I): the effect of the halide on solar water splitting performance

Kevin Sivula, Florian Le Formal, Pauline Bornoz, Xavier Adrian Jeanbourquin, Wiktor Stefan Bourée, Xiaoyun Yu, Mathieu Steven Prévot, Nestor Guijarro Carratala

The realization of photoelectrochemical tandem cells for efficient solar-to-hydrogen energy conversion is currently impeded by the lack of inexpensive, stable, and efficient photocathodes. The family of sulfide chalcopyrites (CuInxGa1-xS2) has recently dem ...

Iop Publishing Ltd2017

Evaluating Charge Carrier Transport and Surface States in CuFeO

Kevin Sivula, Florian Le Formal, Xavier Adrian Jeanbourquin, Wiktor Stefan Bourée, Mathieu Steven Prévot, Nestor Guijarro Carratala

Interest in delafossite (CuFeO2) as a candidate p-type photocathode for photoelectrochemical (PEC) solar fuel production has recently been increasing, mainly due to its excellent stability in aqueous environments and favorable light absorption properties. ...

American Chemical Society2017

The Many Faces of Mixed Ion Perovskites: Unraveling and Understanding the Crystallization Process

Mohammad Khaja Nazeeruddin, Jun Ho Yum, Kevin Sivula, Paul Gratia, Iwan Zimmermann

Understanding the crystallization process of organic-inorganic halide perovskites is of paramount importance for fabrication of reproducible and efficient perovskite solar cells. We report for the first time on the discovery and interplay of ubiquitous hex ...

Amer Chemical Soc2017

Semiconducting materials for photoelectrochemical energy conversion

Kevin Sivula

To achieve a sustainable society with an energy mix primarily based on solar energy, we need methods of storing energy from sunlight as chemical fuels. Photoelectrochemical (PEC) devices offer the promise of solar fuel production through artificial photosy ...

Nature Publishing Group2016

Semiconducting materials for photoelectrochemical energy conversion [Erratum]

Kevin Sivula

2016

The Role of Excitons and Free Charges in the Excited-State Dynamics of Solution-Processed Few-Layer MoS

Kevin Sivula, Natalie Renuka Banerji, Xiaoyun Yu

Solution-processed semiconducting transition metal dichalcogenides are emerging as promising two-dimensional materials for photovoltaic and optoelectronic applications. Here, we have used transient absorption spectroscopy to provide unambiguous evidence an ...

American Chemical Society2016

A Bottom-Up Approach toward All-Solution-Processed High-Efficiency Cu(In,Ga)S

Kevin Sivula, Florian Le Formal, Pauline Bornoz, Xavier Adrian Jeanbourquin, Wiktor Stefan Bourée, Xiaoyun Yu, Mathieu Steven Prévot, Nestor Guijarro Carratala

The development of solution-processable routes to prepare efficient photoelectrodes for water splitting is highly desirable to reduce manufacturing costs. Recently, sulfide chalcopyrites (Cu(In,Ga)S-2) have attracted attention as photocathodes for hydrogen ...

Wiley-VCH Verlag Berlin2016

Effect of molecular weight in diketopyrrolopyrrole-based polymers in transistor and photovoltaic applications

Kevin Sivula, Xavier Adrian Jeanbourquin, Andrea Gasperini

Uncovering the precise effect of the conjugated polymer chain length on the semiconducting properties in thin-film devices is confounded by the step-growth polymerization techniques typically used. Here, we use preparatory size exclusion chromatography to ...

Wiley-Blackwell2016

A Gibeon meteorite yields a high-performance water oxidation electrocatalyst

Paul Joseph Dyson, Arnaud Magrez, Kevin Sivula, Florian Le Formal, Wiktor Stefan Bourée, Charlotte Marie Sornay, Julie Voit, Aswin Gopakumar, Mathieu Steven Prévot, Nestor Guijarro Carratala

Examining the electrocatalytic performance of naturally-occurring metallic minerals is of interest for energy conversion applications given their unique atomic composition and formation history. Herein, we report the electrocatalytic function of an iron-ba ...

2016

Improving charge collection with delafossite photocathodes: a host–guest CuAlO2/CuFeO2 approach

Kevin Sivula, Mathieu Steven Prévot, Nestor Guijarro Carratala, Yang Li

p-Type delafossite CuFeO2 has recently been reported as a promising candidate for direct photoelectrochemical solar water reduction in alkaline conditions. However, despite its favorable optical band gap energy and light absorption, this material suffers f ...

Royal Society of Chemistry2016

Toward Large-Area Solar Energy Conversion with Semiconducting 2D Transition Metal Dichalcogenides

Kevin Sivula, Xiaoyun Yu

The recently discovered unique optoelectronic properties and chemical robustness of mono- or few-layer two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) such as MoS2, WS2, MoSe2, and WSe2 have opened new possibilities for solar en ...

Amer Chemical Soc2016

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, Xavier Adrian Jeanbourquin, Paul Gratia, Yonghui Lee, Iwan Zimmermann, Giulia Grancini, Filippo de Angelis

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

Robust Hierarchically Structured Biphasic Ambipolar Oxide Photoelectrodes for Light-Driven Chemical Regulation and Switchable Logic Applications

Kevin Sivula, Florian Le Formal, Xavier Adrian Jeanbourquin, Wiktor Stefan Bourée, Mathieu Steven Prévot, Nestor Guijarro Carratala

Tunable ambipolar photoelectrochemical behavior emerges from microdomains of nanostructured p-type CuFeO2 and n-type Fe2O3 that arise from a single facile solution-processed thin fi lm. The switchable operation of this system is controlled by chemical, opt ...

Wiley-Blackwell2016

Direct Light-Driven Water Oxidation by a Ladder-Type Conjugated Polymer Photoanode

Kevin Sivula, Pauline Bornoz, Xiaoyun Yu, Mathieu Steven Prévot, Nestor Guijarro Carratala

A conjugated polymer known for high stability (poly[benzimidazobenzophenanthroline], coded as BBL) is examined as a photoanode for direct solar water oxidation. In aqueous electrolyte with a sacrificial hole acceptor (SO32-), photoelectrodes show a morphol ...

American Chemical Society2015

Artificial Photosynthesis with Semiconductor-Liquid Junctions

Kevin Sivula, Florian Le Formal, Nestor Guijarro Carratala

Given the urgent need to develop a sustainable, carbon neutral energy storage system on a global scale, intense efforts are currently underway to advance the field of artificial photosynthesis: i.e. solar fuel engineering. In this review we give an overvie ...

Schweizerische Chemische Gesellschaft2015

Autodecomposition Approach for the Low-Temperature Mesostructuring of Nanocrystal Semiconductor Electrodes

Kevin Sivula, Xavier Adrian Jeanbourquin, Xiaoyun Yu, Mathieu Steven Prévot, Nestor Guijarro Carratala

Templating nanocrystals into mesoporous electrodes using an organic porogen typically requires thermal oxidation at >400 degrees C to completely remove the organic material and afford good electronic properties. These oxidation conditions are incompatible ...

American Chemical Society2015

Self-assembled 2D WSe2 thin films for photoelectrochemical hydrogen production

Kevin Sivula, Xiaoyun Yu, Mathieu Steven Prévot, Nestor Guijarro Carratala

WSe2-a layered semiconductor that can be exfoliated into atomically thin two-dimensional sheets-offers promising characteristics for application in solar energy conversion. However, the lack of controllable, cost-effective methods to scalably fabricate hom ...

Nature Publishing Group2015

Enhancing the Performance of a Robust Sol-Gel-Processed p-Type Delafossite CuFeO2 Photocathode for Solar Water Reduction

Kevin Sivula, Mathieu Steven Prévot, Nestor Guijarro Carratala

Delafossite CuFeO2 is a promising material for solar hydrogen production, but is limited by poor photocurrent. Strategies are demonstrated herein to improve the performance of CuFeO2 electrodes prepared directly on transparent conductive substrates by usin ...

Wiley-VCH Verlag Berlin2015

Templating Sol-Gel Hematite Films with Sacrificial Copper Oxide: Enhancing Photoanode Performance with Nanostructure and Oxygen Vacancies

Kevin Sivula, Xavier Adrian Jeanbourquin, Mathieu Steven Prévot, Nestor Guijarro Carratala, Yuehui Li, Yang Li

Nanostructuring hematite films is a critical step for enhancing photoelectrochemical performance by circumventing the intrinsic limitations on minority carrier transport. Herein, we present a novel sol-gel approach that affords nanostructured hematite film ...

Amer Chemical Soc2015

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