Dr. Karen Dowling

Dr. Karen Dowling

Assistant Professor at TU Delft in Microelectronics

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Pages

Posts

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Blog Post number 4

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Blog Post number 1

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portfolio

Theme 1: Fundamentals of (Ultra)-Wide Bandgaps

I explore material properties and fabrication challenges with wide-bandgaps, such as machining of Silicon Carbide to create high-aspect ratio and 3D structures. Nanofabrication is fun, as pictured! I also look into material properties, such as high field physics of GaAs and GaN, to enable new sensing mechanisms.

Theme 2: Novel Sensor Development

I create novel sensors through new geometries, field engineering, or creative fabrication methods. My main focus is Hall-effect Magnetometers but I also have interest in mechanical sensors (Pressure sensors, accelerometers, etc)

Theme 3: Integration and Deployment of UWBG Sensors

The most exciting element of sensor research is collecting new data in exciting collaborations. In order to do this, we need to create circuits with high-precision readout ability to collect high-quality data. Then we can deploy these devices in interesting environmetns (such as CubeSats, power transformers, and moters)

publications

1. High Sensitivity, High Density Micro-Hydraulic Force Sensor Array Using Stereo-Lithography Fabrication Technique

Sadeghi, M.M., Dowling, K., Peterson, R.L., Najafi, K. “High Sensitivity, High Density Micro-Hydraulic Force Sensor Array Using Stereo-Lithography Fabrication Technique,” presented at IEEE MEMS Conference at Taipei, Taiwan. Jan 20-24, 2013, pp 673-676., acceptance rate 40%.

2. Multilayer Etch Masks for 3-Dimensional Fabrication of Robust Silicon Carbide Microstructures

Dowling, K., Suria, A., Shankar, A., Chapin, C., Senesky, D. “Multilayer Etch Masks for 3-Dimensional Fabrication of Robust Silicon Carbide Microstructures,” presented at IEEE MEMS Conference at Estoril, Portugal. Jan 18-22, 2015, pp 284-287., acceptance rate 41%.

3. Inductive Coupled Plasma Etching of High Aspect Ratio Silicon Carbide Microchannels for Localized Cooling

Dowling, K., Suria, A., Shankar, A., Lee, H., Won, Y., Asheghi, M., Goodson, K., Senesky, D., “Inductive Coupled Plasma Etching of High Aspect Ratio Silicon Carbide Microchannels for Localized Cooling,” presented at InterpackICNMM2015 at San Francisco, CA July 5-9, 2015. DOI: 10.1115/IPACK2015-48409.

4. Low-Temperature Operation of Gallium Nitride Based Ultraviolet Photodetectors

Miller, R., Chapin, C., Dowling, K., Chen, R., Suria, A., Senesky, D., “Low-Temperature Operation of Gallium Nitride Based Ultraviolet Photodetectors,” presented at AIAA SPACE Conferences and Exposition at Long Beach, CA. Sept 13-16, 2013. pp 1-6. DOI: 10.2514/6.2016-5497

5. Profile Evolution of High Aspect Ratio Silicon Carbide Trenches using Inductive Coupled Plasma Etching

Dowling, K.M., Ransom, E.H., Senesky, D.G., “Profile Evolution of High Aspect Ratio Silicon Carbide Trenches using Inductive Coupled Plasma Etching”, IEEE Journal of Microelectromechanical Systems, 2017, 26(1), pp. 135-142.

6. High-Throughput pulse laser manufacturing etch process for complex and released structures from bulk 4H-SiC

Ransom, E.H, Dowling, K.M., Rocca-Bejar, D., Palko, J., Senesky, D, “High-Throughput pulse laser manufacturing etch process for complex and released structures from bulk 4H-SiC,” presented at IEEE MEMS Conference at Las Vegas, NV USA January 22-26 2017.

7. Lithography-free microfabrication of AlGaN/GaN 2DEG strain sensors using laser ablation and direct wirebonding

Dowling, K.M., So, H., Toor, A., Chapin, C.A., and Senesky, D.G., “Lithography-free microfabrication of AlGaN/GaN 2DEG strain sensors using laser ablation and direct wirebonding,” Microelectronic Engineering, vol. 173, pp54-57, 2017

8. Low Temperature and Pressure Response of INAlN/GAN Ring-Shaped High Electron Mobility Transistors

Chapin, C., Miller, R., Chen, R., Dowling, K., and Senesky, D., “Low Temperature and Pressure Response of INAlN/GAN Ring-Shaped High Electron Mobility Transistors,” In Proceedings of IEEE Transducers Conference in Kaohsuing, Taiwan, June 18-22,2017.

9. InAlN/GaN high electron mobility micro-pressure sensors for high-temperature environments

Chapin, C. A., Miller, R. A., Chen, R., Dowling, K. M., and Senesky, D.G., “InAlN/GaN high electron mobility micro-pressure sensors for high-temperature environments,” Sensors and Actuators A: Physical, Vol. 263, pp. 216–223, 2017.

10. Rapid Prototyping Tape Stencils for the Application of Solder Paste

Yang, M.X., Dowling, K., Senesky, D., and Wong, H.-S.P., “Rapid Prototyping Tape Stencils for the Application of Solder Paste,” presented at the International Symposium on Microelectronics: Fall 2017, Vol. 2017, 1, pp. 000652-00065.

11. Graphene-enhanced gallium nitride ultraviolet photodetectors under 2 MeV proton irradiation

Miller, R. A., So, H., Chiamori, H. C., Dowling, K. M., Wang, Y., and Senesky, D.G., “Graphene-enhanced gallium nitride ultraviolet photodetectors under 2 MeV proton irradiation,” Applied Physics Letters, vol. 111, no. 24, 241902, 2017

12. Piezoelectric 2DEG “Metal” Electrodes for High Responsivity, Low Dark Current AlGaN/GaN Photodetectors

Yalamarthy, A.S., Miller, R.A., Dowling, K.M., and Senesky, D.G., “Piezoelectric 2DEG "Metal" Electrodes for High Responsivity, Low Dark Current AlGaN/GaN Photodetectors,” In Proceedings of Compound Semiconductor Week (CSW), Boston, MA, 2018.

13. The Effect of Bias Conditions on AlGaN/GaN 2DEG Hall Plates

Dowling, K.M., Alpert, H.S., Zhang, P., Ramirez, A.N., Yalamarthy, A.S., Köck, H., Ausserlechner, U., and Senesky, D.G. , “The Effect of Bias Conditions on AlGaN/GaN 2DEG Hall Plates,” In Proceedings of Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head, SC, 2018

14. Temperature-Dependent Transient Behavior of AlGaN/GaN High Electron Mobility Pressure Sensors

Chapin, C.A., Dowling, K.M., Phan, H.P., Chen, R., and Senesky, D.G. ,“Temperature-Dependent Transient Behavior of AlGaN/GaN High Electron Mobility Pressure Sensors,” In Proceedings of Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head, SC, 2018.

15. Highly sensitive pressure sensors employing 3C-SiC nanowires fabricated on a free standing structure

Phan, H.-P., Dowling, K.M., Ngyuen, T.-K., Dinh, T., Senesky, D.G., Namazu, T., Dao, D.V., and Nguyen, N.-T., “Highly sensitive pressure sensors employing 3C-SiC nanowires fabricated on a free standing structure,” Materials & Design, vol. 156, pp. 16-21, 2018

16. Highly sensitive 4H-SiC pressure sensor at cryogenic and elevated temperatures

Ngyuyn, T.K., Phan, H.-P,, Dinh, T., Dowling, K.M., Foisal, A.R., Senesky, D.G., Nguyen, N.-T, and Dao, D.V., “Highly sensitive 4H-SiC pressure sensor at cryogenic and elevated temperatures,” Materials & Design, vol. 156, pp 441-445, 2018.

17. Characterization of the piezoresistance in highly doped p-type 3C-SiC at cryogenic temperatures

Phan, H.-P., Dowling, K.M., Ngyuen, T.-K., Chapin, C.A., Dinh, T., Miller, R.A., Han, J., Iacopi, A., Senesky, D.G., and Nguyen, N.-T., “Characterization of the piezoresistance in highly doped p-type 3C-SiC at cryogenic temperatures,” RSC Advances, vol. 8, pp. 29976-29979, 2018.

18. Effect of Geometry on Sensitivity and Offset of AlGaN/GaN and InAlN/GaN Hall-effect Sensors

Alpert, H.S., Dowling, K.M., Chapin, C.A., Yalamarthy, A.S., Benbrook, S.R., Köck, H., Ausserlechner, U., and Senesky, D.G., “Effect of Geometry on Sensitivity and Offset of AlGaN/GaN and InAlN/GaN Hall-effect Sensors,” IEEE Sensors Journal, Vol. 19, 10, pp 3640-3646, 2019.

19. Micro-Tesla Offset in Thermally Stable AlGaN/GaN 2DEG Hall-effect Plates using Current Spinning

Dowling, K.M., Alpert, H.S., Yalamarthy, A.S., Satterthwaite, P.F., Kumar, S., Köck, H., Ausserlechner, U., and Senesky, D.G., “Micro-Tesla Offset in Thermally Stable AlGaN/GaN 2DEG Hall-effect Plates using Current Spinning,” IEEE Sensors Letters, Vol 3. 3, 2019.

20. Significant Phonon Drag Enables High Power Factor in the AlGaN/GaN Two-Dimensional Electron Gas

Yalamarthy, A.S., Muñoz Rojo, M., Bruefach, A., Boone, D., Dowling, K.M., Satterthwaite, P.F., Goldhaber-Gordon, D., Pop, E. and Senesky, D.G., “Significant Phonon Drag Enables High Power Factor in the AlGaN/GaN Two-Dimensional Electron Gas,” Nano letters. 2019.

21. Lithography and Etching?Free Microfabrication of Silicon Carbide on Insulator Using Direct UV Laser Ablation

Nguyen, T.-K., Phan, H.-P., Dowling, K.M., Yalamarthy, A.S., Dinh, T., Balakrishnan, V., Liu, T., Chapin, C.A., Truong, Q.-D., Dau, V.T., Goodson, K.E., Senesky, D.G., Dao, D.V., Nguyen, N-T., Lithography and Etching-Free Microfabrication of Silicon Carbide on Insulator Using Direct UV Laser Ablation, Advanced Engineering Materials, vol. 22, 4, p. 1901173, 2020.

22. Sensitivity of 2DEG-based Hall-effect sensors at high temperatures

Alpert, H.S., Chapin, C.A., Dowling, K.M., Benbrook, S.R., Köck, H., Ausserlechner, U., Senesky, D.G., “Sensitivity of 2DEG-based Hall-effect sensors at high temperatures,” Review of Scientific Instruments, vol. 91, 2, p 025003, 2020.

23. Low Offset and Noise in High Biased GaN 2DEG Hall-Effect Plates Investigated with Infrared Microscopy

Dowling, K.M., Liu, T., Alpert, H.S., Chapin, C.A., Eisner, S.R., Yalamarthy, A., Satterthwaite, P.F., Köck, H., Ausserlechner, U., Asheghi, M., Goodson, K.E., and Senesky, D.G., “Low Offset and Noise in High Biased GaN 2DEG Hall-Effect Plates Investigated with Infrared Microscopy,” Journal of Microelectromechanical Systems, vol. 29, 5, pp.1-8, 2020.

24. Deployment of InAlN/GaN Hall-effect Sensors for Bucket Transformer Monitoring and Forecasting

Janowitz, J., Holliday, M., Dowling, K., Yeung, B., Kumar, S., Peterson, R., Alpert, H., Chapin, C., Lopez, J., and Senesky, D.G. , “Deployment of InAlN/GaN Hall-effect Sensors for Bucket Transformer Monitoring and Forecasting,” In Proceedings of IEEE Sensors, Virtual Conference, 2020.

25. Design and simulation of near-terahertz GaN photoconductive switches- operation in the negative differential mobility regime and pulse compression

Rakheja, S. Li, K., Dowling, K.M., Conway, A.M, and Voss, L.F., “Design and simulation of near-terahertz GaN photoconductive switches- operation in the negative differential mobility regime and pulse compression,” IEEE Journal of Electron Devices Society, vol. 9, pp. 521-532, 2021.

26. Monte Carlo transport analysis to assess intensity dependent response of a carbon-doped GaN photoconductor

Milestone, W., Guo, D., Sanati, M., Dowling, K.M., Hau-Riege, S., Voss, L.F., Conway, A., and Joshi, R.P., “Monte Carlo transport analysis to assess intensity dependent response of a carbon-doped GaN photoconductor,” Journal of Applied Physics, vol. 129, 19, p. 195703, 2021.

27. A Prony-based curve-fitting method for characterization of RF pulses from optoelectronic devices

Mukherjee, S., Dowling, K.M., Dong. Y, Li, K. Conway, A., Rakheja, S., and Voss, L., “A Prony-based curve-fitting method for characterization of RF pulses from optoelectronic devices,” IEEE Signal Processing Letters, vol. 29, pp. 364-368, 2021.

28. Pulse Compression Photoconductive Switching Using Negative Differential Mobility

Dowling, K.M., Dong, Y., Hall, D., Mukherjee, S., Schneider, J.D., Hau-Riege, S., Harrison, S.E., Leos, L., Conway, A., Rakheja, S., and Voss, L.F., “Pulse Compression Photoconductive Switching Using Negative Differential Mobility,” IEEE Transactions on Electron Devices, vol. 69, 2, pp. 590-596, 2022.

29. Design considerations for gallium arsenide pulse compression photoconductive switch

Dong, Y., Dowling, K.M., Hau-Riege, S., Conway, A., Voss, L.F., and Rakheja, S., “Design considerations for gallium arsenide pulse compression photoconductive switch,” Journal of Applied Physics, vol. 131, 13, pp. 134504, 2022.

talks

teaching

Power Semiconductor Devices and Technology

Gradaute Level Course, Stanford University, Department of Electrical Engineering, 2018

I was the first teaching assistant for Prof. Jim Plummer’s new power devices course on wide-bandgap devices, EE218 at Stanford. I assistend in course material development and provided extra guidance at office hours and lecture tutorials.

team