Aapo Varpula

Grosse, C., Ras, M. A., Varpula, A., Grigoras, K., May, D., Wunderle, B., Chapuis, P.-O., Gomès, S. & Prunnila, M., 1 Aug 2018, In: Sensors and Actuators A: Physical. 278, p. 33-42

Research output: Contribution to journal › Article › Scientific › peer-review

18 Citations (Scopus)

2017

Thermoelectric thermal detectors based on ultra-thin heavily doped single-crystal silicon membranes

Varpula, A., Timofeev, A., Shchepetov, A., Grigoras, K., Hassel, J., Ahopelto, J., Ylilammi, M. & Prunnila, M., 26 Jun 2017, In: Applied Physics Letters. 110, 26, 262101.

Research output: Contribution to journal › Article › Scientific › peer-review

33 Citations (Scopus)

2015

Nondestructive characterization of fusion and plasma activated wafer bonding using mesa and recess structures

Varpula, A., Suni, T. & Dekker, J. R., 2015, In: ECS Journal of Solid State Science and Technology. 4, 2, p. P42 - P52

Research output: Contribution to journal › Article › Scientific › peer-review

Open Access

5 Citations (Scopus)

Si, GaAs, and InP as cathode materials for photon-enhanced thermionic emission solar cells

Varpula, A., Tappura, K. & Prunnila, M., 2015, In: Solar Energy Materials and Solar Cells. 134, p. 351-358

Research output: Contribution to journal › Article › Scientific › peer-review

48 Citations (Scopus)

2014

Contacting mode operation of work function energy harvester

Varpula, A., Laakso, S. J., Havia, T., Kyynäräinen, J. & Prunnila, M., 2014, In: Journal of Physics: Conference Series. 557, 012010.

Research output: Contribution to journal › Article › Scientific › peer-review

Open Access

9 Citations (Scopus)

Harvesting vibrational energy using material work functions

Varpula, A., Laakso, S., Havia, T., Kyynäräinen, J. & Prunnila, M., 2014, In: Scientific Reports. 4, 6799.

Research output: Contribution to journal › Article › Scientific › peer-review

Open Access

35 Citations (Scopus)

2012

Critical scattering in the vicinity of the metal-insulator transition in Mn-doped GaAs

Varpula, A., Novikov, S. & Kuivalainen, P., 2012, In: Physica Status Solidi B: Basic Research. 249, 4, p. 834-839

Research output: Contribution to journal › Article › Scientific › peer-review

2 Citations (Scopus)

Diffusion-emission theory of photon enhanced thermionic emission solar energy harvesters

Varpula, A. & Prunnila, M., 2012, In: Journal of Applied Physics. 112, 4, 044506.

Research output: Contribution to journal › Article › Scientific › peer-review

58 Citations (Scopus)

Glass polarization induced drift in microelectromechanical capacitor

Haarahiltunen, A., Varpula, A., Leinvuo, J., Siren, E., Rytkönen, V.-P. & Savin, H., 2012, In: Journal of Applied Physics. 111, 10, 4 p., 103523.

Research output: Contribution to journal › Article › Scientific › peer-review

Open Access

2 Citations (Scopus)

High-k GaAs metal insulator semiconductor capacitors passivated by ex-situ plasma-enhanced atomic layer deposited AlN for Fermi-level unpinning

Jussila, H., Mattila, P., Oksanen, J., Perros, A., Riikonen, J., Bosund, M., Varpula, A., Huhtio, T., Lipsanen, H. & Sopanen, M., 2012, In: Applied Physics Letters. 100, 7, 4 p., 071606.

Research output: Contribution to journal › Article › Scientific › peer-review

19 Citations (Scopus)

Single-walled carbon nanotube network field effect transistor as a humidity sensor

Mudimela, P. R., Grigoras, K., Anoshkin, I. V., Varpula, A., Ermolov, V., Anisimov, A. S., Nasibulin, A. G., Novikov, S. & Kauppinen, E. I., 2012, In: Journal of Sensors. 2012, 7 p., 496546.

Research output: Contribution to journal › Article › Scientific › peer-review

Open Access

13 Citations (Scopus)

Stability of magnetic polarons in magnetic semiconductor single electron transistors: The effect of Coulomb interaction and external magnetic field

Lebedeva, N., Varpula, A., Novikov, S. & Kuivalainen, P., Nov 2012, In: Physica Status Solidi B: Basic Research. 249, 11, p. 2244-2249

Research output: Contribution to journal › Article › Scientific › peer-review

5 Citations (Scopus)

2011

A compact quantum statistical model for the ballistic nanoscale MOSFETs

Varpula, A., Lebedeva, N. & Kuivalainen, P., Jul 2011, In: Physica Status Solidi A: Applications and Materials Science. 208, 7, p. 1726-1732

Research output: Contribution to journal › Article › Scientific › peer-review

3 Citations (Scopus)

Modeling the effect of mobile ion contamination on the stability of a microelectromechanical resonator

Haarahiltunen, A., Varpula, A. & Savin, H., 15 Aug 2011, In: Journal of Applied Physics. 110, 4, 043505.

Research output: Contribution to journal › Article › Scientific › peer-review

3 Citations (Scopus)

Time dependence of charge transfer processes in diamond studied with positrons

Mäki, J. M., Tuomisto, F., Varpula, A., Fisher, D., Khan, R. U. A. & Martineau, P. M., 16 Nov 2011, In: Physical Review Letters. 107, 21, 217403.

Research output: Contribution to journal › Article › Scientific › peer-review

16 Citations (Scopus)

Transient characterization techniques for resistive metal-oxide gas sensors

Varpula, A., Novikov, S., Haarahiltunen, A. & Kuivalainen, P., 28 Nov 2011, In: Sensors and Actuators B: Chemical. 159, 1, p. 12-26

Research output: Contribution to journal › Article › Scientific › peer-review

42 Citations (Scopus)

2010

Atomic layer deposition of tin dioxide sensing film in microhotplate gas sensors

Niskanen, A. J., Varpula, A., Utriainen, M., Natarajan, G., Cameron, D. C., Novikov, S., Airaksinen, V.-M., Sinkkonen, J. & Franssila, S., 30 Jun 2010, In: Sensors and Actuators B: Chemical. 148, 1, p. 227-232

Research output: Contribution to journal › Article › Scientific › peer-review