Recently in Joule, Zhang, Li, and colleagues reported a new benchmark in photocatalytic overall water splitting. By optimizing the co-catalysts and redox mediator between the light absorbers in a two-step heterogeneous photosystem, the authors reached an a ...

CELL PRESS2018

Nanocrystalline Boron-Doped Diamond as a Corrosion-Resistant Anode for Water Oxidation via Si Photoelectrodes

Ladislav Kavan, Jun Ho Yum, Kevin Sivula, Florian Le Formal, Petr Ashcheulov

Due to its high sensitivity to corrosion, the use of Si in direct photoelectrochemical (PEC) water-splitting systems that convert solar energy into chemical fuels has been greatly limited. Therefore, the development of low-cost materials resistant to corro ...

AMER CHEMICAL SOC2018

Defect Mitigation of Solution-Processed 2D WSe2 Nanoflakes for Solar-to-Hydrogen Conversion

Kevin Sivula, Xiaoyun Yu, Nestor Guijarro Carratala

Few-atomic-layer nanoflakes of liquid-phase exfoliated semiconducting transition metal dichalcogenides (TMDs) hold promise for large-area, high-performance, low-cost solar energy conversion, but their performance is limited by recombination at defect sites ...

American Chemical Society (ACS)2018

Potential-sensing electrochemical atomic force microscopy for in operando analysis of water-splitting catalysts and interfaces

Kevin Sivula

Heterogeneous electrochemical phenomena, such as (photo)electrochemical water splitting to generate hydrogen using semiconductors and/or electrocatalysts, are driven by the accumulated charge carriers and thus the interfacial electrochemical potential grad ...

2018

Defect engineering of liquid phase exfoliated 2D semiconducting WSe2 nanoflakes for solar fuel generation

Kevin Sivula

AMER CHEMICAL SOC2018

Photogenerated Charge Harvesting and Recombination in Photocathodes of Solvent-Exfoliated WSe2

Kevin Sivula, Xiaoyun Yu

Understanding and optimizing the effects of edge states and nanoflake dimensions on the photon harvesting efficiency in ultrathin transition-metal dichalcogenide (TMD) semiconductor photoelectrodes is critical to assessing their practical viability for sol ...

Amer Chemical Soc2017

Morphology stabilization strategies for small-molecule bulk heterojunction photovoltaics

Kevin Sivula, Xavier Adrian Jeanbourquin, Simon Hänni, Muhammad Aiman Bin Rahmanudin Hamdan, Emilie Aude Marie Ripaud, Arvindh Sekar, Liang Yao

The greater crystallinity of solution-processed small-molecule organic semiconductors, compared to their polymer counterparts, renders the bulk heterojunction (BHJ) more susceptible to phase separation under thermal stress, decreasing device performance. H ...

Royal Society of Chemistry2017

Advancing Materials and Methods for Photoelectrochemical Energy Conversion

Kevin Sivula

Strategies to convert energy from the sun into chemical fuels and feedstocks for a carbon-neutral economy are under rapid development. A photoelectrochemical route uses a direct semiconductor liquid junction that offers simplicity but places challenging co ...

Swiss Chemical Soc2017

Layered 2D semiconducting transition metal dichalcogenides for solar energy conversion

Kevin Sivula, Xiaoyun Yu

2017

Hybrid Heterojunctions of Solution-Processed Semiconducting 2D Transition Metal Dichalcogenides

Kevin Sivula, Xavier Adrian Jeanbourquin, Natalie Renuka Banerji, Xiaoyun Yu, Muhammad Aiman Bin Rahmanudin Hamdan, Nestor Guijarro Carratala

Exfoliated transition metal dichalcogenides (2D-TMDs) are attractive light-harvesting materials for large-area and inexpensive solar energy conversion given their ability to form highly tolerant heterojunctions. However, the preparation of large-area heter ...

Amer Chemical Soc2017

Engineering the self-assembly of diketopyrrolopyrrole-based molecular semiconductors via an aliphatic linker strategy

Kevin Sivula, Xavier Adrian Jeanbourquin, Andrea Gasperini, Xiaoyun Yu, Muhammad Aiman Bin Rahmanudin Hamdan, Nestor Guijarro Carratala, Emilie Aude Marie Ripaud

The solid-state self-assembly of molecular semiconductors is a key aspect for controlling the optoelectronic properties of organic electronic materials. Herein, we investigate the use of a flexible linker strategy to control the self-assembly of a solution ...

Royal Society of Chemistry2017

Amorphous Ternary Charge-Cascade Molecules for Bulk Heterojunction Photovoltaics

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

Ternary bulk heterojunctions with cascade-type energy-level configurations are of significant interest for further improving the power conversion efficiency (PCE) of organic solar cells. However, controlling the self-assembly in solution-processed ternary ...

Amer Chemical Soc2017

Heterotetracenes: Flexible Synthesis and in Silico Assessment of the Hole Transport Properties

Kevin Sivula, Anne-Clémence Corminboeuf, Jérôme Waser, Xavier Adrian Jeanbourquin, Yifan Li, Felipe Andres Saenz Padilla, Ganna Gryn'ova

Thienoacenes and furoacenes are among the most frequent molecular units found in organic materials. The efficient synthesis of morphologically different heteroacenes and the rapid determination of their solid-state and electronic properties are still chall ...

2017

Molecular Strategies for Morphology Control in Semiconducting Polymers for Optoelectronics

Kevin Sivula, Muhammad Aiman Bin Rahmanudin Hamdan

Solution-processable semiconducting polymers have been explored over the last decades for their potential applications in inexpensively fabricated transistors, diodes and photovoltaic cells. However, a remaining challenge in the field is to control the sol ...

Schweizerische Chemische Gesellschaft2017

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