About me
I work as a Senior Scientist in the Photonics Laboratory, Physics unit. My specialty are III-V semiconductor materials and components and their fabrication and characterization. I have also the Title of Docent in semiconductor technologies.
Responsibilities
Radiation safety officer (the XRD instruments at Physic unit, the micro-XRF instrument at Tampere microscopy center)
Infra responsibilities and acting as the contact person regarding semiconductor fabrication and characterization infra
Research on optoelectronic materials and devices
Taking part to Research hub planning especially regarding MBE and semiconductor analysis rooms
Fields of expertise
Characterization of epitaxial semiconductor materials (XRD, GIXRD, XRR, PL, DLTS, C-V, reflectance and transmission measurements, Hall, microscopy, AFM, EQE, L-I-V-T)
Design and characterization III-V semiconductor solar cells (single junction, multijunction devices)
Molecular beam epitaxy (III-V semiconductor materials and structures (e.g. lasers, solar cells)
Design, fabrication and characterization of quantum structures and optical thin films
Latest publications
Corrigendum to “Pinhole-resistant nanocrystalline rutile TiO2 photoelectrode coatings” [Acta Materialia 239 (2022) 118257] (Acta Materialia (2022) 239, (S1359645422006371), (10.1016/j.actamat.2022.118257))
Palmolahti, L., Ali-Löytty, H., Hannula, M., Saari, J., Wang, W., Tukiainen, A., Lahtonen, K. & Valden, M., 1 May 2023, In: Acta Materialia. 249, 118818.Research output: Contribution to journal › Comment/debate › Scientific
Development of VCSELs for cyogenic (4.2 K) optical interfaces
Viheriälä, J., Uusitalo, T., Virtanen, H., Namvar, B., Rajala, P., Ranta, S., Hakkarainen, T., Tukiainen, A., Almuneau, G. & Guina, M., 2023, 2023 IEEE Photonics Society Summer Topicals Meeting Series (SUM). IEEE, (LEOS Summer Topical Meeting).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review
Role of CsMnCl3Nanocrystal Structure on Its Luminescence Properties
Matuhina, A., Grandhi, G. K., Pan, F., Liu, M., Ali-Löytty, H., Ayedh, H. M., Tukiainen, A., Smått, J-H., Vähänissi, V., Savin, H., Li, J., Rinke, P. & Vivo, P., 2023, In: ACS Applied Nano Materials. 6, 2, p. 953–965 13 p.Research output: Contribution to journal › Article › Scientific › peer-review
Bandgap energy model for GaInNAsSb/GaAs alloys with high N content and strain influence
Isoaho, R., Aho, A., Tukiainen, A., Salminen, T. & Guina, M., 2022, In: Journal of Crystal Growth. 584, 5 p., 126574.Research output: Contribution to journal › Article › Scientific › peer-review
Epitaxial lift-off process for GaAs solar cells controlled by InGaAs internal sacrificial stressor layers and a PMMA surface stressor
Ramu, P., Aho, A., Polojärvi, V., Aho, T., Tukiainen, A., Hakkarainen, T., Reuna, J., Lyytikäinen, J., Hytönen, R. & Guina, M., Dec 2022, In: Solar Energy Materials and Solar Cells. 248, 6 p., 111982.Research output: Contribution to journal › Article › Scientific › peer-review
High performance low-bandgap (0.8 eV) single junction GaInNAsSb solar cells incorporating Au-based back surface reflectors
Isoaho, R., Aho, T., Aho, A., Tukiainen, A., Reuna, J. V. T., Raappana, M. & Guina, M., Jan 2022, In: Solar Energy Materials & Solar Cells. 234, 10 p.Research output: Contribution to journal › Article › Scientific › peer-review
Insights into Tailoring of Atomic Layer Deposition Grown TiO2 as Photoelectrode Coating
Saari, J., Ali-Löytty, H., Kauppinen, M. M., Hannula, M., Lahtonen, K., Palmolahti, L., Tukiainen, A., Grönbeck, H. & Valden, M., 8 Sept 2022.Research output: Other conference contribution › Poster › Scientific
Low-Temperature Route to Direct Amorphous to Rutile Crystallization of TiO2Thin Films Grown by Atomic Layer Deposition
Saari, J., Ali-Löytty, H., Lahtonen, K., Hannula, M., Palmolahti, L., Tukiainen, A. & Valden, M., 15 Sept 2022, In: Journal of Physical Chemistry C. 126, 36, p. 15357-15366 10 p.Research output: Contribution to journal › Article › Scientific › peer-review
Optical Performance Assessment of Nanostructured Alumina Multilayer Antireflective Coatings Used in III-V Multijunction Solar Cells
Reuna, J., Hietalahti, A., Aho, A., Isoaho, R., Aho, T., Vuorinen, M., Tukiainen, A., Anttola, E. & Guina, M., 2022, In: ACS Applied Energy Materials. 5, 5, p. 5804-5810 7 p.Research output: Contribution to journal › Article › Scientific › peer-review
Optimization of reactive ion beam sputtered Ta2O5 for III–V compounds
Reuna, J., Vuorinen, M., Isoaho, R., Aho, A., Mäkelä, S., Hietalahti, A., Anttola, E., Tukiainen, A. & Guina, M., 1 Dec 2022, In: Thin Solid Films. 763, 9 p., 139601.Research output: Contribution to journal › Article › Scientific › peer-review