Risto Punkkinen
PhD
Semiconductor technology; electrical characterization of semiconductor materials; electrical characterization electronic components; sensor technology; diode based particle detectors
Semiconductor technology
Risto Punkkinen (born 1951) received his MSc degree in physics from the University of Turku,Finland in 1976 and received his PhD in physics from the University of Turku, Finland 1990. Since then he has worked at the university almost all the time mainly in teaching. He has retired in August 2021. After that he has worked as a part-time researcher in Academy of project Foresail and worked as a part-time teacher teaching basic courses in electronics.
My reseach has concentrated on semiconductor technology and measuring technology.
One object was to study the possiblity of manufacturing silicon-based laser.
In sensor technology, we succeeded in manufacturing a sensor on a silicon substrate that is capable of detecting very low hydrogen concentrations in air.
Our laboratory laboratory has produced and measured the main particle diode dectectors used in Academy’s Foresail satellite project to be used in space. Also the setup of the particle detector system PATE was finalized in the clean room.
Material science: trying to improve the properties of a MOSFET by using different materials in order to improve the mobility of electrons and holes.
Teaching has covered the basic and advanced courses in electronics and semiconductor technology and being responsible of them.
- Below 1% Reflectance for Black GaAs Surface Prepared by Facile Two-Step Wet Chemical Treatment: Hydrogen Peroxide and Water (2025)
- Advanced photonics research
Jahanshah Rad, Zahra; Laaksonen, Johanna; Alitupa, Valtteri; Miettinen, Mikko; Iltanen, Kari; Lehtiö, Juha-Pekka; Granroth, Sari; Angervo, Ilari; Punkkinen, Marko; Punkkinen, Risto; Kuzmin, Mikhail; Mäkilä, Ermei; Laukkanen, Pekka; Paturi, Petriina; Kokko, Kalevi; Vuori, Sami; Lastusaari, Mika; Singh, Harishchandra; Huttula, Marko; Singh, Manvedra Narayan; Tukiainen, Antti; Tuorila, Heidi; Piirilä, Helmer; Viheriälä, Jukka; Guina, Mircea; Kozlova, Jekaterina; Rähn, Mihkel; Tamm, Aile
- Effects of ultra-high vacuum treatments on n-type Si contact resistivity (2025) Miettinen, Mikko; Vuorinen, Esa; Lehtio, Juha-Pekka; Rad, Zahra Jahanshah; Punkkinen, Risto; Kuzmin, Mikhail; Jarvinen, Jarno; Vahanissi, Ville; Laukkanen, Pekka; Savin, Hele; Kokko, Kalevi
- Potential of ultrahigh-vacuum based surface treatments in silicon technology (2025)
- Microelectronic Engineering
Jahanshah Rad, Zahra; Miettinen, Mikko; Punkkinen, Risto; Suomalainen, Petri; Punkkinen, Marko; Laukkanen, Pekka; Kokko, Kalevi
- Surface Properties of p‐GaN and Formation of Nickel Metal Contacts (2025)
- Advanced Materials Interfaces
Miettinen, Mikko; Nuutila, Vesa; Jahanshah Rad, Zahra; Ebrahimzadeh, Masoud; Ruokonen, Anni; Punkkinen, Risto; Lehtio, Juha-Pekka; Punkkinen, Marko; Laukkanen, Pekka; Kokko, Kalevi; Suihkonen, Sami; Savin, Hele; Wang, Weimin
- Properties and modification of native oxides of InP(100) (2023)
- Journal of Physics D: Applied Physics
Ebrahimzadeh Masoud, Vuori Sami, Miettinen Mikko, Lehtiö Juha-Pekka, Granroth Sari, Punkkinen Marko P. J., Jahanshah Rad Zahra Sadat, Punkkinen Risto, Kuzmin Mikhail, Laukkanen Pekka, Lastusaari Mika, Kokko Kalevi
- Wet Chemical Treatment and Mg Doping of p-InP Surfaces for Ohmic Low-Resistive Metal Contacts (2023)
- Advanced Engineering Materials
Ebrahimzadeh Masoud, Granroth Sari, Vuori Sami, Punkkinen Marko, Miettinen Mikko, Punkkinen Risto, Kuzmin Mikhail, Laukkanen Pekka, Lastusaari Mika, Kokko Kalevi
- Controlling the fixed negative charge formation in Si/high-k interfaces (2022)
- Physical Review Materials
Lehtiö Juha-Pekka, Jahanshah Rad Zahra, Punkkinen Marko, Punkkinen Risto, Kuzmin Mikhail, Laukkanen Pekka, Kokko Kalevi
- 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
- Effects of thermal vacuum nitridation of Si(100) surface via NH3 exposure (2022) Ebrahimzadeh Masoud, Lehtiö Juha-Pekka, Punkkinen Marko, Punkkinen Risto, Miettinen Mikko, Jahanshah Rad Zahra, Kuzmin Mikhail, Laukkanen Pekka, Kokko Kalevi
- The Effect of Ultraviolet Treatment on TiO2 Nanotubes: A Study of Surface Characteristics, Bacterial Adhesion, and Gingival Fibroblast Response (2022) Kobayashi Masahiko, Abdulmajeed Aous A., Moon Jongyun, Shahramian Khalil, Punkkinen Risto, Shimada Jun, Vallittu Pekka K., Lassila Lippo V.
- Aalto-1, multi-payload CubeSat: design, integration and launch (2021) Praks J., Mughal M. Rizwan, Vainio R., Janhunen P., Envall J., Oleynik P., Näsilä A., Leppinen H., Niemelä P., Slavinskis A., Gieseler J., Toivanen P., Tikka T., Peltola T., Bosser A., Schwarzkopf G., Jovanovic N., Riwanto B., Kestilä A., Punkkinen A., Punkkinen R., Hedman H.-P., Säntti T., Lill J.-O., Slotte J.M.K., Kettunen H., Virtanen A.
- Aalto-1, multi-payload CubeSat: In-orbit results and lessons learned (2021) Mughal MR, Praks J, Vainio R, Janhunen P, Envall J, Näsilä A, Oleynik P, Niemelä P, Slavinskis A, Gieseler J, Jovanovic N, Riwanto B, Toivanen P, Leppinen H, Tikka T, Punkkinen A, Punkkinen R, Hedman HP, Lill JO, Slotte JMK
- Atomic-Scale Modification of Oxidation Phenomena on the Ge(100) Surface by Si Alloying (2021) Kuzmin Mikhail, Lehtiö Juha-Pekka, Jahanshah Rad Zahra, Sorokina Svetlana V., Punkkinen Marko P. J., Hedman Hannu-Pekka, Punkkinen Risto, Laukkanen Pekka, Kokko Kalevi
- Observation of Si 2p Core‐Level Shift in Si/High‐κ Dielectric Interfaces Containing a Negative Charge (2021)
- Advanced Electronic Materials
Lehtiö Juha-Pekka, Rad Zahra Jahanshah, Granroth Sari, Yasir Muhammad, Punkkinen Marko, Punkkinen Risto, Hedman Hannu-Pekka, Rueff Jean-Pascal, Rauha Ismo TS, Savin Hele, Laukkanen Pekka, Kokko Kalevi
- Calibration of RADMON radiation monitor onboard Aalto-1 CubeSat (2020)
- Advances in Space Research
Oleynik P, Vainio R, Punkkinen A, Dudnik O, Gieseler J, Hedman H, Hietala H, Hæggström E, Niemelä P, Peltonen J, Praks J, Punkkinen R, Säntti T, Valtonen E
- Decreasing Interface Defect Densities via Silicon Oxide Passivation at Temperatures Below 450 degrees C (2020)
- ACS Applied Materials and Interfaces
Jahanshah Rad Zahra, Lehtiö Juha-Pekka, Mack Iris, Rosta Kawa, Chen Kexun, Vähänissi Ville, Punkkinen Marko, Punkkinen Risto, Hedman Hannu-Pekka, Pavlov Andrei, Kuzmin Mikhail, Savin Hele, Laukkanen Pekka, Kokko Kalevi
- Particle telescope aboard FORESAIL-1: Simulated performance (2020)
- Advances in Space Research
Oleynik Philipp, Vainio Rami, Hedman Hannu-Pekka, Punkkinen Arttu, Punkkinen Risto, Salomaa Lassi, Säntti Tero, Tuominen Jarno, Virtanen Pasi, Bosser Alexandre, Janhunen Pekka, Kilpua Emilia, Palmroth Minna, Praks Jaan, Slavinskis Andris, Kakakhel Syed RU, Peltonen Juhani, Plosila Juha, Tammi Jani, Tenhunen Hannu, Westerlund Tomi
- Radiation monitor RADMON aboard Aalto-1 CubeSat: First results (2020)
- Advances in Space Research
Gieseler Jan, Oleynik Philipp, Hietala Heli, Vainio Rami, Hedman Hannu-Pekka, Peltonen Juhani, Punkkinen Arttu, Punkkinen Risto, Säntti Tero, Hæggström Edward, Praks Jaan, Niemelä Petri, Riwanto Bagus, Jovanovic Nemanja, Mughal M. Rizwan
- Clinical assessment of a non-invasive wearable MEMS pressure sensor array for monitoring of arterial pulse waveform, heart rate and detection of atrial fibrillation (2019) Matti Kaisti, Tuukka Panula, Joni Leppänen, Risto Punkkinen, Mojtaba Jafari Tadi, Tuija Vasankari, Samuli Jaakkola, Tuomas Kiviniemi, Juhani Airaksinen, Pekka Kostiainen, Ulf Meriheinä, Tero Koivisto, Mikko Pänkäälä
- FORESAIL‐1 CubeSat Mission to Measure Radiation Belt Losses and Demonstrate Deorbiting (2019)
- Journal of Geophysical Research: Space Physics
M. Palmroth, J. Praks, R. Vainio, P. Janhunen, E. K. J. Kilpua, A. Afanasiev, M. Ala‐Lahti, A. Alho, T. Asikainen, E. Asvestari, M. Battarbee, A. Binios, A. Bosser, T. Brito, M. Dubart, J. Envall, U. Ganse, N. Yu. Ganushkina, H. George, J. Gieseler, S. Good, M. Grandin, S. Haslam, H.‐P. Hedman, H. Hietala, N. Jovanovic, S. Kakakhel, M. Kalliokoski, V. V. Kettunen, T. Koskela, E. Lumme, M. Meskanen, D. Morosan, M. Rizwan Mughal, P. Niemelä, S. Nyman, P. Oleynik,
A. Osmane, E. Palmerio, J. Peltonen, Y. Pfau‐Kempf, J. Plosila, J. Polkko, S. Poluianov, J. Pomoell, D. Price, A. Punkkinen, R. Punkkinen, B. Riwanto, L. Salomaa, A. Slavinskis, T. Säntti, J. Tammi, H. Tenhunen, P. Toivanen, J. Tuominen, L. Turc, E. Valtonen, P. Virtanen, T. Westerlund
