Zobrazeno 1 - 10 of 144 pro vyhledávání: '"Pekka Laukkanen"'
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Akademický článek
Surface Passivation of Germanium with ALD Al2O3: Impact of Composition and Crystallinity of GeOx Interlayer
Autor: Joonas Isometsä, Zahra Jahanshah Rad, Tsun H. Fung, Hanchen Liu, Juha-Pekka Lehtiö, Toni P. Pasanen, Oskari Leiviskä, Mikko Miettinen, Pekka Laukkanen, Kalevi Kokko, Hele Savin, Ville Vähänissi
Publikováno v: Crystals, Vol 13, Iss 4, p 667 (2023)
Germanium is an excellent material candidate for various applications, such as field effect transistors and radiation detectors/multijunction solar cells, due to its high carrier mobilities and narrow bandgap, respectively. However, the efficient pas
Externí odkaz: https://doaj.org/article/8eee7eeb28bc4cb79d51591e4741e569
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Plasma-enhanced atomic layer deposited SiO2 enables positive thin film charge and surface recombination velocity of 1.3 cm/s on germanium
Autor: Hanchen Liu, Toni P. Pasanen, Oskari Leiviskä, Joonas Isometsä, Tsun Hang Fung, Marko Yli-Koski, Mikko Miettinen, Pekka Laukkanen, Ville Vähänissi, Hele Savin
Publikováno v: Applied Physics Letters. 122
The excellent field-effect passivation provided by aluminum oxide (Al2O3) on germanium surfaces relies on the high negative fixed charge present in the film. However, in many applications, a neutral or a positive charge would be preferred. Here, we i
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::14de0e82623a558a070877d4afba73f5
https://doi.org/10.1063/5.0152652
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Efficient surface passivation of germanium nanostructures with 1% reflectance
Autor: Tsun Hang Fung, Joonas Isometsä, Juha-Pekka Lehtiö, Toni Pasanen, Hanchen Liu, Oskari Leiviska, Pekka Laukkanen, Hele Savin, Ville Vähänissi
Publikováno v: Nanotechnology.
Germanium (Ge) is a vital element for applications that operate in near-infrared wavelengths. Recent progress in developing nanostructured Ge surfaces has resulted in > 99 % absorption in a wide wavelength range (300 nm- 1700 nm), promising unprecede
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b2ef64497d5c709b18e48ed5cf1d28c1
https://doi.org/10.1088/1361-6528/acd25b
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6
Reusable radiochromic hackmanite with gamma exposure memory
Autor: Sami Vuori, Pauline Colinet, Juha-Pekka Lehtiö, Arnaud Lemiere, Isabella Norrbo, Micael Granström, Jari Konu, Göran Ågren, Pekka Laukkanen, Laeticia Petit, Anu J. Airaksinen, Ludo van Goethem, Tangui Le Bahers, Mika Lastusaari
Publikováno v: Materials Horizons
Materials Horizons, 2022, ⟨10.1039/D2MH00593J⟩
International audience; Hackmanites are reusable and non-toxic materials for radiochromic films. They show a unique “gamma memory” function where the width of the reflectance spectrum changes permanently, but the ability to change color reversibl
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::414c5616d654ba89d816052d17c4bb74
https://pubmed.ncbi.nlm.nih.gov/36069965
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7
The structural origin of the efficient photochromism in natural minerals
Autor: Pauline Colinet, Hannah Byron, Sami Vuori, Juha-Pekka Lehtiö, Pekka Laukkanen, Ludo Van Goethem, Mika Lastusaari, Tangui Le Bahers
Publikováno v: Proceedings of the National Academy of Sciences of the United States of America
Proceedings of the National Academy of Sciences of the United States of America, 2022, 119 (23), ⟨10.1073/pnas.2202487119⟩
Significance Natural photochromic minerals have been reported by geologists for decades. However, the understanding of the photochromism mechanism has a key question still unanswered: What in their structure gives rise to the photochromism’s revers
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::370cf85d6aef8183a4e7f22ffb115442
https://pubmed.ncbi.nlm.nih.gov/35653570
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8
Properties and modification of native oxides of InP(100)
Autor: Masoud Ebrahimzadeh, Sami Vuori, Mikko Miettinen, Juha-Pekka Lehtiö, Sari Granroth, Marko P J Punkkinen, Zahra Sadat Jahanshah Rad, Risto Punkkinen, Mikhail Kuzmin, Pekka Laukkanen, Mika Lastusaari, Kalevi Kokko
Publikováno v: Journal of Physics D: Applied Physics. 56:044001
Properties of oxidized InP surfaces, which are known to cause less electrical and optical losses than other III–V oxides, are relevant to develop the passivation of current and future applications of III–V crystals (e.g. lasers, detectors). We re
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d91a239c47c0cbb5c26a3d80e0517914
https://doi.org/10.1088/1361-6463/aca259
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10
Unusual oxidation-induced core-level shifts at the HfO2/InP interface
Autor: Jaakko Mäkelä, Antti Lahti, Marjukka Tuominen, Muhammad Yasir, Mikhail Kuzmin, Pekka Laukkanen, Kalevi Kokko, Marko P. J. Punkkinen, Hong Dong, Barry Brennan, Robert M. Wallace
Publikováno v: Scientific Reports, Vol 9, Iss 1, Pp 1-14 (2019)
X-ray photoelectron spectroscopy (XPS) is one of the most used methods in a diverse field of materials science and engineering. The elemental core-level binding energies (BE) and core-level shifts (CLS) are determined and interpreted in the XPS. Oxid
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doajarticles::de5db6059af2430952d0996fe146b8ea
http://link.springer.com/article/10.1038/s41598-018-37518-2
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