Maarit J. Karppinen

Thermoelectric p‐Type Iron‐Based Ethylenetetrathiolate Coordination Polymers

Malar Auxilia Francis, Mari Heikkinen, Girish C. Tewari, Kristoffer Meinander et autres

ABSTRACT Here we demonstrate high room‐temperature Seebeck coefficient of 95 µV K −1 in combination with ultralow thermal conductivity of 0.18 W m −1 K −1 for a novel bimetallic p‐type semiconducting coordination polymer. We synthesize the (Fe, Cu) bimetallic coordination polymer …

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Tailoring Photochromism Beyond Human Eye Visibility: On/Off Switchable NIR Absorption in an Aluminosilicate

Bettiina Muurinen, Hannah Byron, Teppo Kreivilä, Roosa Vastamäki et autres

Photochromic materials are able to change reversibly between two colors. The color change is triggered by ultraviolet radiation and reversed by white light and/or heating. Inorganic photochromes have been thought to operate with fixed wavelengths only, and because of this, their usage …

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Tailoring Photochromism Beyond Human Eye Visibility: On/Off Switchable NIR Absorption in an Aluminosilicate

Bettiina Muurinen, Hannah Byron, Teppo Kreivilä, Roosa Vastamäki et autres

ABSTRACT Photochromic materials are able to change reversibly between two colors. The color change is triggered by ultraviolet radiation and reversed by white light and/or heating. Inorganic photochromes have been thought to operate with fixed wavelengths only, and because of this, their …

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Reversible Light-Induced Surface Superwetting of Atomic/Molecular Layer-Deposited TiO 2 :Organic Superlattices for Flexible Optical Applications

Lavinia Saltarelli, Ramin Ghiyasi, Anish Philip, Janne‐Petteri Niemelä et autres

-based inorganic:organic SLs we present in this work are expected to open attractive pathways for antireflective coatings with added functionalities such as self-cleaning and antifogging surfaces.

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Atomic and Molecular Layer Deposition of Nd- and Eu-Based Oxide and Hybrid Thin Films: Computationally Guided Precursor Selection

Florian Preischel, Amr Ghazy, Merve Seren, Jorit Obenlüneschloß et autres

High Resolution Image Download MS PowerPoint Slide The exploration of Nd and Eu precursors bearing the (form-)amidinate ligand for atomic layer deposition (ALD) with water resulted in crystalline Nd 2 O 3 and Eu 2 O 3 thin films on Si substrates …

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Orthorhombic ZrO2 thin films via atomic layer deposition from tris(dimethylamino)cyclopentadienyl zirconium and water

Basit Ali, Ramin Ghiyasi, Maarit J. Karppinen

Different zirconium dioxide phases exhibit attractive functional properties, making them suitable for various applications. Among these, orthorhombic o-ZrO₂ is of particular interest due to its distinctive ferroelectric behavior. However, synthesizing phase-pure o-ZrO₂ thin films has remained challenging. Here, we demonstrate a robust …

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Thermoelectric metal chalcogenides: a platform for anion mixing studies

Oleksandr Dobrozhan, Sajida Kousar, Girish C. Tewari, Maarit J. Karppinen

Metal chalcogenides represent state-of-the-art thermoelectric (TE) materials, both in practical TE energy conversion devices and in new TE material research. To further push the performance boundaries of these materials, the major challenge is to suppress the thermal conductivity as much as possible …

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Atomic and Molecular Layer Deposition of Nd- and Eu-Based Oxide and Hybrid Thin Films: Computationally Guided Precursor Selection

Florian Preischel, Amr Ghazy, Merve Seren, Jorit Obenlüneschloß et autres

The exploration of Nd and Eu precursors bearing the (form-)amidinate ligand for atomic layer deposition (ALD) with water resulted in crystalline Nd2O3 and Eu2O3 thin films on Si substrates at low temperatures. Eu2O3 films exhibit strong photoluminescence with well-defined 5D0 → 7Fj …

Area-Selective Atomic/Molecular Layer Deposition of Europium-Organic Thin Films on Graphene and Other 2D Materials for Photoluminescent Heterostructures

Aleksei V. Emelianov, Kamila K. Mentel, Amr Ghazy, Joona Pekkanen et autres

Developing a controlled, defect-free, and spatially selective deposition of molecular and hybrid thin films on 2D materials remains a key challenge for their integration into multifunctional optoelectronic systems due to their surface inertness. Here, we demonstrate area-selective atomic/molecular layer deposition of europium-organic …

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(Invited) Area-Selective Atomic-Molecular Layer Deposition of Photoluminescent Europium-Organic Thin Films on Graphene Activated by Direct Laser Writing

Mika Pettersson, Aleksei V. Emelianov, Kamila K. Mentel, Amr Ghazy et autres

Area-selective atomic layer deposition (AS-ALD) is a promising technique for advanced nanofabrication processes. This allows for the simple bottom-up creation of intricate nanostructures essential for advanced optoelectronic and sensor applications. 1 Due to the flexibility of ALD, the method can be used …

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Area-selective atomic/molecular layer deposition via block copolymer approach: Zn-benzene dithiol deposition as a case study

Olga Partanen, Lijo George, Anish Philip, Mauri A. Kostiainen et autres

We have developed a novel atomic/molecular layer deposition (ALD/MLD) process for the growth of essentially air-stable zinc-organic thin films from diethyl zinc and 1,4-benzene dithiol (BDT) precursors at an appreciably low deposition temperature of 60 °C. The low deposition temperature along with …

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Tunable Electrical and Optical Properties in Atomic Layer Deposited TiO 2 :Pt Thin Films via Dynamic Metallic Nanoparticle Formation

Ramin Ghiyasi, Girish C. Tewari, Maarit J. Karppinen

Abstract Composite TiO2:Pt thin films deposited by atomic layer deposition (ALD) exhibit significant temperature‑dependent resistivity transitions, from insulating to semiconducting to metallic‑like conducting behavior, while remaining transparent to visible light and strongly absorbing ultraviolet (UV) radiation. The composite films are fabricated using …

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