University Research Fellow, Materials Research Laboratory
Docent, Department of Physics and Astronomy


Areas of expertise

surface science
semiconductors, surface passivation, film growth


Pekka Laukkanen obtained his MSc degree in 2000 at Tampere University of Technology in the field of optoelectronics. He completed his PhD thesis in 2005 in the area of surface physics at University of Turku. He is now working at interface between surface science and semiconductor technology, trying to improve interconnection and collaboration between these fields. His expertise area includes photoelectron spectroscopy, scanning tunneling microscopy, electron diffraction, surface passivation, interface defects, and semiconductor technology. Laukkanen has published 130 refereed articles, four book chapters, and three patents.


Recently I have teched the following courses at the University of Turku:

- Phases and properties of materials (Aineen olomuodot ja ominaisuudet)

- Electrical properties of solids (Kiinteän aineen sähköiset ominaisuudet)

- Semiconductors (Puolijohteet)

- Semiconductor spectroscopy (method course)


We have investigated surface properties: chemical, electronic, and structural ones of semiconductor crystals including silicon (Si), germanium (Ge), and III-V compound semiconductors (e.g. GaAs, GaN, InAs, InP) by means of electron diffraction (LEED, RHEED), scanning tunneling microscopy and spectroscopy (STM/STS), and photoelectron spectroscopy (including synchrotron sources). One goal has been to develop the connection or collaboration between the surface science and the semiconductor technology disciplines. More recently we have focused on the question how to decrease surface-related electrical losses and malfunctions in various semiconductor-based devices like capacitors, sensors, solar cells, and transistors. We have tried to understand reasons for formation of defect levels in device surfaces and to find controlled methods to decrease the amount of defect levels. 


Sort by:

Effects of post oxidation of SiO2/Si interfaces in ultrahigh vacuum below 450 °C (2022)

Jahanshah Rad Zahra, Lehtiö Juha-Pekka, Chen Kexun, Mack Iris, Vähänissi Ville, Miettinen Mikko, Punkkinen Marko, Punkkinen Risto, Suomalainen Petri, Hedman Hannu-Pekka, Kuzmin Mikhail, Kozlova Jekaterina, Rähn Mihkel, Tamm Aile, Savin Hele, Laukkanen Pekka, Kokko Kalevi
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))

The structural origin of the efficient photochromism in natural minerals (2022)

Proceedings of the National Academy of Sciences of the United States of America
Colinet Pauline, Byron Hannah, Vuori Sami, Lehtiö Juha-Pekka, Laukkanen Pekka, Van Goethem Ludo, Lastusaari Mika, Le Bahers Tangui
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))

Reusable radiochromic hackmanite with gamma exposure memory (2022)

Materials Horizons
Vuori Sami, Colinet Pauline, Lehtiö Juha-Pekka, Lemiere Arnaud, Norrbo Isabella, Granström Micael, Konu Jari, Ågren Göran, Laukkanen Pekka, Petit Laeticia, Airaksinen Anu J., van Goethem Ludo, Le Bahers Tangui, Lastusaari Mika
(Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1))

Black silicon boron emitter solar cells with EQE above 95% in UV (2021)

IEEE Photovoltaic Specialists Conference, Conference Record IEEE Photovoltaic Specialists Conference
Chen Kexun, Vähänissi Ville, Jahanshah Rad Zahra, Lehtiö Juha-Pekka, Laukkanen Pekka, Yli-Koski Marko, Savin Hele
(Vertaisarvioitu artikkeli konferenssijulkaisussa (A4))