Kari Hjelt

RESEARCH INTERESTS

Graphene

RECENT SCHOLAR PUBLICATIONS

The commercialization of graphene electronics
K Hjelt, H Dscher
Nature Electronics, 1-3 2024



Photoluminescence of AgInSe2
K Hjelt, J Krustokb, M Yakushev, H Collan, AE Hill, RD Tomlinson
Ternary and Multinary Compounds, 441-444 2020



Graphene is on track to deliver on its promises
T Rei, K Hjelt, AC Ferrari
Nature nanotechnology 14 (10), 907-910 2019



System and method for interactive distribution of digital content
JO Heikel, TI Kannas, TJ Mattila, O Paloheimo, KT Hjelt, R Rikkola
US Patent 9,626,016 2017



Dynamically configurable balancing board
K Hjelt, S Keronen
US Patent 9,044,634 2015



Mobile electronic system
S Naukkarinen, T Ryhnen, K Hjelt, K Inha
US Patent 8,401,571 2013



Sensing arrangement
T Ryhnen, K Hjelt
US Patent 7,813,534 2010



Arrangement for authentication of a person
T Ryhnen, K Hjelt
US Patent 7,606,400 2009



Acceleration sensor
K Hjelt, T Ryhanen, S Silanto, J Salminen
US Patent 7,350,424 2008



System, method and computer program product for managing physiological information relating to a terminal user
K Hjelt, S Naukkarinen, J Nihtil, T Ryhnen, T Vitikainen
US Patent 7,278,966 2007



Body fat monitoring system and method employing mobile terminal
K Hjelt, K Nybergh, J Hyyrylinen, T Ryhnen, S Naukkarinen
US Patent 7,103,407 2006



Terminal and associated method and computer program product for monitoring at least one activity of a user
K Hjelt, J Friman, J Jarvi, S Naukkarinen, J Ollikainen
US Patent App. 10/871,176 2005



System and method for implementing sensor functionality in mobile devices
K Hjelt, S Naukkarinen, T Ryhanen, J Sairanen, J Salminen, S Silanto, ...
US Patent App. 10/607,832 2004



Apparatus for measuring a small quantity of a liquid
MJ Vellekoop, KT Hjelt, GW Lubking
US Patent 6,796,174 2004



Touch detection system for mobile terminals
J Mntyjrvi, K Nybergh, J Himberg, K Hjelt
International Conference on Mobile Human-Computer Interaction, 331-336 2004



Measuring liquid volumes in subnanoliter wells
IT Young, KH Hjelt, LR van den Doel, MJ Vellekoop, LJ van Vliet
Biomedical Instrumentation Based on Micro-and Nanotechnology 4265, 75-80 2001



Nanoliter droplet behavior in micromachined wells
KT Hjelt, GW Lubking, MJ Vellekoop, LJ van Vliet, LR van den Doel, ...
Sensors Update 8 (1), 39-70 2000



Nanometer-scale height measurements in micromachined picoliter vials based on interference fringe analysis
LR Van den Doel, LJ van Vliet, KT Hjelt, MJ Vellekoop, F Gromball, ...
Proceedings 15th International Conference on Pattern Recognition. ICPR-2000 2000



Measuring liquid evaporation from micromachined wells
KT Hjelt, R van den Doel, W Lubking, MJ Vellekoop
Sensors and Actuators A: Physical 85 (1-3), 384-389 2000



High-resolution liquid volume detection in sub-nanoliter reactors
KT Hjelt, R van den Doel, W Lubking, MJ Vellekoop
Sensors and Actuators A: Physical 83 (1-3), 61-66 2000

MOST CITED SCHOLAR PUBLICATIONS

Terminal and associated method and computer program product for monitoring at least one activity of a user
K Hjelt, J Friman, J Jarvi, S Naukkarinen, J Ollikainen
US Patent App. 10/871,176 2005
Citations: 438



System, method and computer program product for managing physiological information relating to a terminal user
K Hjelt, S Naukkarinen, J Nihtil, T Ryhnen, T Vitikainen
US Patent 7,278,966 2007
Citations: 359



Does the low-temperature Arrhenius plot of the photoluminescence intensity in CdTe point towards an erroneous activation energy?
J Krustok, H Collan, K Hjelt
Journal of applied physics 81 (3), 1442-1445 1997
Citations: 261



The role of spatial potential fluctuations in the shape of the PL bands of multinary semiconductor compounds
J Krustok, H Collan, M Yakushev, K Hjelt
Physica Scripta 1999 (T79), 179 1999
Citations: 172



System and method for implementing sensor functionality in mobile devices
K Hjelt, S Naukkarinen, T Ryhanen, J Sairanen, J Salminen, S Silanto, ...
US Patent App. 10/607,832 2004
Citations: 120



Body fat monitoring system and method employing mobile terminal
K Hjelt, K Nybergh, J Hyyrylinen, T Ryhnen, S Naukkarinen
US Patent 7,103,407 2006
Citations: 97



Graphene is on track to deliver on its promises
T Rei, K Hjelt, AC Ferrari
Nature nanotechnology 14 (10), 907-910 2019
Citations: 94



Arrangement for authentication of a person
T Ryhnen, K Hjelt
US Patent 7,606,400 2009
Citations: 90



Deep center luminescence in p‐type CdTe
J Krustok, V Valdna, K Hjelt, H Collan
Journal of applied physics 80 (3), 1757-1762 1996
Citations: 89



Photoluminescence of Cd_1—xZn_xTe Crystals Grown by High‐Pressure Bridgman Technique
K Hjelt, M Juvonen, T Tuomi, S Nenonen, EE Eissler, M Bavdaz
physica status solidi (a) 162 (2), 747-763 1997
Citations: 79



Sensing arrangement
T Ryhnen, K Hjelt
US Patent 7,813,534 2010
Citations: 69



Nanometer-scale height measurements in micromachined picoliter vials based on interference fringe analysis
LR Van den Doel, LJ van Vliet, KT Hjelt, MJ Vellekoop, F Gromball, ...
Proceedings 15th International Conference on Pattern Recognition. ICPR-2000 2000
Citations: 45



Mobile electronic system
S Naukkarinen, T Ryhnen, K Hjelt, K Inha
US Patent 8,401,571 2013
Citations: 34



Acceleration sensor
K Hjelt, T Ryhanen, S Silanto, J Salminen
US Patent 7,350,424 2008
Citations: 33



Photoluminescence from deep acceptor-deep donor complexes in CdTe
J Krustok, H Collan, K Hjelt, J Mdasson, V Valdna
Journal of luminescence 72, 103-105 1997
Citations: 32



Measuring liquid evaporation from micromachined wells
KT Hjelt, R van den Doel, W Lubking, MJ Vellekoop
Sensors and Actuators A: Physical 85 (1-3), 384-389 2000
Citations: 28



Photoluminescence and photoluminescence excitation study of
J Krustok, H Collan, K Hjelt, M Yakushev, AE Hill, RD Tomlinson, ...
Journal of applied physics 83 (12), 7867-7872 1998
Citations: 28



Dynamically configurable balancing board
K Hjelt, S Keronen
US Patent 9,044,634 2015
Citations: 24



1.4 eV photoluminescence in chlorine-doped polycrystalline CdTe with a high density of defects
J Krustok, J Madasson, K Hjelt, H Collan
Journal of materials science 32, 1545-1550 1997
Citations: 23



Fluorescence detection in (sub-) nanoliter microarrays
LR van den Doel, MJ Vellekoop, PM Sarro, S Picioreanu, R Moerman, ...
Micro-and Nanofabricated Structures and Devices for Biomedical Environmental 1999
Citations: 20