Ki Jun Yu

Silicon Thin Film



School of Electrical & Electronic Engineering, Yonsei University

Seodaemun-gu Yonsei-ro 50 C224, Seoul, Republic of Korea






University of Illinois at Urbana-Champaign

Ph.D., in Electrical & Computer Engineering (2015)

M.S., in Electrical & Computer Engineering (2012)

B.S., in Electrical Engineering (2008)      


Professional Career:


2017-Present, School of Electrical & Electronic Engineering, Yonsei University

2016-2017, Postdoctoral Associate, UIUC, Department of Materials Science & Engineering.


Research Area:


Bio-integrated Electronics, Flexible Electronics




Google Scholar: total citations: > 10,000, h-index = 37


1.    Y. Cho, J. Lee, U. Jeong, S. Park, S. Lim, K. Kim, J. Jang, J. Park, H. Kim, H. Shin, H Jeon, Y. Jung, I. Cho, K. J. Yu “Ultra‐Low Cost, Facile Fabrication of Transparent Neural Electrode Array for Electrocorticography with Photoelectric Artifact‐Free Optogenetics” Advanced Functional Materials 32 (10), 2105568 (2022)

2.    M. Sang, K. Kang, Y. Zhang, H. Zhang, K. Kim, M. Cho, J. Shin, J. Hong, T. Kim, S. Lee, W. Yeo, J. Lee, T. Lee, B. Xu, K. J. Yu “Ultrahigh Sensitive Au‐Doped Silicon Nanomembrane Based Wearable Sensor Arrays for Continuous Skin Temperature Monitoring with High Precision” Advanced Materials 34 (4), 2105865 (2022)

3.    T. Kim, H. Kim, J. Han, W. Choi, K. J. Yu “Flexible InGaP/GaAs Tandem Solar Cells Encapsulated with Ultrathin Thermally Grown Silicon Dioxide as a Permanent Water Barrier and an Antireflection Coating” ACS Applied Energy Materials, In press (2022)
4.    Y. Cho, S. Park, J. Lee, K. J. Yu “Emerging materials and technologies with applications in flexible neural implants: a comprehensive review of current issues with neural devices” Advanced Materials 33 (47), 2005786 (2021)
5.    M. Mahmood, S. Kwon, H. Kim, Y. Kim, P. Siriaraya, J. Choi, B. Otkhmezuri, K. Kang, K. J. Yu, Y. Jang, C. Ang, W. Yeo “Wireless Soft Scalp Electronics and Virtual Reality System for Motor Imagery‐Based Brain–Machine Interfaces” Advanced Science 8 (19) (2021)
6.    K. Kang, J. Park, K. Kim, K. J. Yu “Recent developments of emerging inorganic, metal and carbon-based nanomaterials for pressure sensors and their healthcare monitoring applications” Nano Research 14 (9), 3096-3111 (2021)
7.    T. Kim, H. Kim, D. Geum, J. Han, I. Kim, N. Hong, G. Ryu, J. Kang, W. Choi, K. J. Yu “Ultra-Lightweight, Flexible InGaP/GaAs Tandem Solar Cells with a Dual-Function Encapsulation Layer” ACS Applied Materials & Interfaces 13 (11), 13248-13253 (2021)
8.    N. Hong, D. Geum, T. Kim, S. Ahn, J. Han, D. Jung, G. Ryu, S. Kim, K. J. Yu, W. Choi “Flexible GaAs Photodetectors with Ultrathin Thermally Grown Silicon Dioxide as a Long‐Lived Barrier for Chronic Biomedical Implants” Advanced Photonics Research 2 (2), 2000051(2021)
9.    N. Hong, R. Chu, S. Kang, G. Ryu, J. Han, K. Yu, D. Jung, W. Choi “Flexible GaAs photodetector arrays hetero-epitaxially grown on GaP/Si for a low-cost III-V wearable photonics platform” Optics Express 28 (24), 36559-36567 (2020)
10.    K. Song, H. Seo, D. Seong, S. Kim, K. J. Yu, Y. Kim, J. Kim, S. Kwon, H. Han, I. Youn, H. Lee, D. Son “Adaptive self-healing electronic epineurium for chronic bidirectional neural interfaces” Nature communications 11 (1), 1-10 (2020)
11.    C. Chiang, S. Won, A. Orsborn, K. Yu, M. Trumpis, B. Bent, C. Wang, Y. Xue, S. Min, V. Woods, C. Yu, B. Kim, S. Kim, R. Huq, J. Li, K. Seo, F. Vitale, A. Richardson, H. Fang, Y. Huang, K. Shepard, B. Pesaran, J. Rogers, J. Viventi “Development of a neural interface for high-definition, long-term recording in rodents and nonhuman primates” Science translational medicine 12 (538), eaay4682 (2020)
12.    S. Mishra, Y. Kim, J. Intarasirisawat, Y. Kwon, Y. Lee, M. Mahmood, H. Lim, R. Herbert, K. J. Yu, C. Ang, W. Yeo “Soft, wireless periocular wearable electronics for real-time detection of eye vergence in a virtual reality toward mobile eye therapies” Science advances 6 (11), eaay1729 (2020)
13.    S. Lee, J. Yoon, D. Lee, D. Seong, S. Lee, M. Jang, J. Choi, K. Yu, J. Kim, S. Lee, D. Son “Wireless epidermal electromyogram sensing system” Electronics 9 (2), 269 (2020)
14.    J. Li, R. Li, C. Chiang, Y. Zhong, H. Shen, E. Song, M. Hill, S. Won, K. J. Yu, J. Baek, Y. Lee, J. Viventi, Y. Huang, J. Rogers “Ultrathin, High Capacitance Capping Layers for Silicon Electronics with Conductive Interconnects in Flexible, Long‐Lived Bioimplants” Advanced Materials Technologies 5 (1), 1900800 (2020)
15.    E. Song, C. Chiang, R. Li, X. Jin, J. Zhao, M. Hill, Y. Xia, L. Li, Y. Huang, S. Won, K. J. Yu, X. Sheng, H. Fang, M. Alam, Y. Huang, J. Viventi, J. Chang, J. Rogers “Flexible electronic/optoelectronic microsystems with scalable designs for chronic biointegration” Proceedings of the National Academy of Sciences 116 (31), 15398-15406 (2019)
16.    M. Sang, J. Shin, K. Kim, K. J. Yu “Electronic and thermal properties of graphene and recent advances in graphene based electronics applications” Nanomaterials 9 (3), 374 (2019)
17.    L. Tian, B. Zimmerman, A. Akhtar, K. J. Yu, M. Moore, R. Larson, J. W. Lee, J. Li, Y. Liu, B. Metzger, S. Qu, X. Guo, J. Wu, K. E. Mathewson, E. Epstein, J. M Cornman, M. Fatina, Q. Zhao, Y. Ma, S. Ma, J. Zhang, Y. Zhang, F. Dolcos, M. Fabiani, G. Gratton, L. J. Hargrove, P. Braun, Y. Huang, J. A. Rogers "Large area, MRI-compatible epidermal electrical interfaces for prosthetic control and cognitive monitoring" Nature biomedical engineering 3 (3), 194-205 (2019)
18.    J. Shin, Y. Yan, W. Bai, Y. Xue, P. Gamble, L. Tian, I. Kandela, C. Haney, W. Spees, Y. Lee, M. Choi, J. Ko, H. Ryu, J. Chang, M. Pezhouh, S. Kang, S. Won, K. J. Yu, J. Zhao, Y. Lee, M. MacEwan, S. Song, Y. Huang, W. Ray, J. Rogers “Bioresorbable pressure sensors protected with thermally grown silicon dioxide for the monitoring of chronic diseases and healing processes” Nature biomedical engineering 3 (1), 37-46 (2019)
19.    J. Li, E. Song, K. Chiang, K. J. Yu, J. Koo, H. Du, Y. Zhong, J. Zhang, Y. Chen, L. Tian, Y. Zhong, G. Fang, J. Viventi, J. A. Rogers “Conductively coupled flexible silicon electronic systems for chronic neural electrophysiology” Proceedings of the National Academy of Science, 115 (41) E9542 (2018)
20.    E. Song, R. Li, X. Jin, H. Du, Y. Huang, J. Zhang, Y. Xia, H. Fang, Y. K. Lee, K. J. Yu, J. Chang, Y. Mei, M. A. Alam, Y. Huang, J. A. Rogers “Ultrathin Trilayer Assemblies as Long-Lived Barriers against Water and Ion Penetration in Flexible Bioelectronic Systems” ACS Nano, 12, 10317 (2018)
21.    K. Nan, S. Kang, K. Li, K. J. Yu, F. Zhu, J. Wang, A. Dunn, C. Zhou, Z. Xie, M. Agne, H. Wang, H. Luan, Y. Zhang, Y. Huang, J. A. Rogers “Compliant and stretchable thermoelectric coils for energy harvesting in miniature flexible devices” Science Advances, 4: eaau5849 (2018)
22.    T. Kim, M. Cho, K. J. Yu “Flexible and stretchable bio-integrated electronics based on carbon nanotube and graphene” Materials, 8, 11 (2018)
23.    S. Lee, G. Hwang, T. H. Kim, S. J. Kwon, J. U. Kim, K. Koh, B. Park, H. Hong, K. J. Yu, H. Chae, Y. Jung, J. Lee, T. I. Kim “On-demand drug release from gold nanoturf for a thermo- & chemo-therapeutic esophageal stent” ACS Nano, 12, 6756 (2018)
24.    K. W. Kang, Y. W. Cho, K. J. Yu “Novel nano-materials and nano-fabrication techniques for flexible electronic system” Micromachines, 9, 6, (2018)
25.    L. Lu, Z. Yang, K. Meacham, C. Cvetkovic, E. A. Corbin, A. Vázquez-Guardado, M. Xue, L. Yin, J. Boroumand, G. Pakeltis, T. Sang, K. J. Yu, D. Chanda, R. Bashir, R. W. Gereau, IV, X. Sheng, J. A. Rogers “Biodegradable Monocrystalline Silicon Photovoltaic Microcells as Power Supplies for Transient Biomedical Implants” Advanced Energy Materials, 1703035 (2018)
26.    Y. K. Lee, K. J. Yu, et al., “Kinetics and chemistry of hydrolysis of ultrathin, thermally grown layers of silicon dioxide as biofluids barriers in flexible electronic systems” ACS Applied Materials & Interfaces, 9, 42633 (2017)
27.    Y. K. Lee, K. J. Yu, E. Song, A. B. Fairmani, F. Vitale, Z. Xie, Y. Yoon, Y. Kim, A. Richardson, H. Luan, Y. Wu, X. Xie, T. H. Lucas, K. Crawford, Y. Mei, X. Feng, Y. Huang, B. Litt, N. R. Aluru, L. Yin, J. A. Rogers, “Mechanical assembly, transfer and release of three-dimensional mesostructures as high temperature growth templates, electronic cellular scaffolds and self-propelled micro-robotsStudies of the dissolution of monocrystalline silicon nanomembrane and of their use as encapsulation layers and electrical interfaces in water-soluble forms of electronics” ACS Nano, 11, 12562 (2017)
28.    Z. Yan, M. Han, Y. Shi, A. Badea, Y. Yang, A. Kulkarni, E. Hanson, M. Kandel, X. Wen, F. Zhang, Y. Luo, Q. Lin, H. Zhang, X. Guo, Y. Huang, K. Nan, S. Jia, A. W. Oraham, M. B. Mevis, J. Lim, X. Guo, M. Gao, W. Ryu, K. J. Yu, B. G. Nicolau, A. L. Petronico, S. Rubakhin, J. Lou, P. M. Ajayan, K. Thornton, G. Popescu, D. Fang, J. V. Sweedler, P. V. Braun, H. Zhang, R. G. Nuzzo, Y. Huang, Y. Zhang, J. A. Rogers, “Mechanical assembly, transfer and release of three-dimensional mesostructures as high temperature growth templates, electronic cellular scaffolds and self-propelled micro-robots” Proceedings of the National Academy of Science, 114 (45), E9455-E9464 (2017)
29.    K. J. Yu, Z. Yang, M. Han, J. A. Rogers, “Inorganic semiconducting materials for flexible and stretchable electronics.” Nature Partner Journal (NPJ) Flexible Electronics, 1, 1-14 (2017)
30.    E. Song, Y. K. Lee, R. Li, J. Li, X. Jin, K. J. Yu, Z. Xie, H. Fang, Y. Zhong, H. Du, J. Zhang, G. Fang, Y. Kim, Y. Yoon, M. A. Alam, Y. Mei, Y. Huang, J. A. Rogers, “Transferred, ultrathin oxide bilayers as biofluid barriers for flexible electronic implants.” Advanced Functional Materials 3 (8), 1700077 (2017)
31.    K. I. Jang, K. Li, H. U. Chung, S. Xu, H. N. Jung, Y. Yang, J. W. Kwak, H. H. Jung, J. Song, C. Yang, A. Wang, Z. Liu, J. Y. Lee, B. H. Kim, J. H. Kim, J. Lee, Y. Yu, B. J. Kim, H. Jang, K. J. Yu, J. Kim, J. W. Lee, J. W. Jeong, Y. M. Song, Y. Huang, Y. Zhang, J. A. Rogers, “Self-assembled three dimensional network designs for soft electronics.” Nature Communications 8 (1), 1-10 (2017)
32.    E. Song, H. Fang, X. Jin, J. Zhao, C. Jiang, K. J. Yu, Y. Zhong, D. Xu, J. Li, G. Fang, H. Du, J. Zhang, J. M. Park, Y. Huang, M. A. Alam, Y. Mei, J. A. Rogers, “Thin, transferred layers of silicon dioxide and silicon nitride as water and ion barriers for implantable flexible electronic systems.” Advanced Electronic Materials 3, 1700077 (2017)
33.    H. Fang, K. J. Yu, C. Gloschat, Z. Yang, K. Chiang4 , J. Zhao, S. Won, S. Xu, M. Trumpis, Y. Zhong, E. Song, S. W. Han, Y. Xue, D. Xu, J. Viventi, Y. Huang, G. Cauwenberghs, M. Kay, I. Efimov & J. Rogers “Capacitively coupled arrays of multiplexed, flexible silicon transistors for cardiac electrophysiology” Nature biomedical engineering 1 (3), 1-12 (2017)
34.    Y. Su, X. Ping, K. J. Yu, J. W. Lee, J. A. Fan, B. Wang, M. Li, R. Li, D. V. Harburg, Y. A. Huang, C. Yu, S. Mao, J. Shim, Q. Yang, P.-Y. Lee, A. Armonas, K.-J. Choi, Y. Yang, U. Paik, T. Chang, T. J. Dawidczyk, Y. Huang, S. Wang, J. A. Rogers, “In-Plane Deformation Mechanics for Highly Stretchable Electronics.” Advanced Materials 29, 1604989 (2017)
35.    H. Fang, J. Zhao, K. J. Yu, E. Song, A. B. Farimani, C. Chiang, X. Jin, Y. Xue, D. Xu, W. Du, K. J. Seo, Y. Zhong, Z. Yang, S. M. Won, G. Fang, S. W. Choi, S. Chaudhuri, Y. Huang, M. A. Alam, J. Viventi, N. Aluru, J. Rogers “Ultrathin, transferred layers of thermally grown silicon dioxide as biofluid barriers for biointegrated flexible electronic systems,” Proceedings of the National Academy of Sciences 113, 11682-11687 (2016)
36.    J. W. Lee, R. Xu, S. Lee, K-I Jang, Y. Yang, A. Banks, K. J. Yu, J. Kim, S. Xu, S. Ma, S. W. Jang, P. Won, Y. Li, B. H. Kim, J. Choe, S. Huh, Y. H. Kwon, Y. Huang, U. Paik, J. A. Rogers, “Soft, thin skin-mounted power management systems and their use in wireless thermography.” Proceedings of the National Academy of Sciences 113, 6131-6136 (2016)
37.    K. J. Yu, D. Kuzum, S-W Hwang, B. H. Kim, H. Juul, N. H. Kim, S. M. Won, K. Chiang, M. Trumpis, A. G. Richardson, H. Cheng, H. Fang, M. Thompson, H. Bink, D. Talos, K. J. Seo, H. N. Lee, S.-K. Kang, J. H. Kim, J. Y. Lee, Y, Huang, F. E. Jensen, M. A. Dichter, T. H. Lucas, J. Viventi, B. Litt, J. Rogers, “Bioresorbable silicon electronics for transient spatio-temporal mapping of electrical activity from the cerebral cortex.” Nature Materials 15, 782–791 (2016)
38.    B. H. Kim, S. Nam, N. Oh, S.-Y. Cho, K. J. Yu, C. H. Lee, J. Zhang, K. Deshpande, P. Trefonas, J.-H. Kim, J. Lee, J. H. Shin, Y. Yu, J. B. Lim, S. M. Won, Y. K. Cho, N. H. Kim, K. J. Seo, H. Lee, T.-i. Kim, M. Shim, and J. Rogers, ACS Nano 10, 4920–4925 (2016)
39.    J. W. Jeong, G. Shin, S. I. Park, K. J. Yu, L. Xu, J. Rogers “Soft Materials in Neuroengineering for Hard Problems in Neuroscience” Neuron 86 (1), 175-186 (2015)
40.    K. I. Jang, H. U. Chung, S. Xu, C. H. Lee, H. Luan, J. W. Jeong, H. Cheng, G. Kim, S. Y. Han, J. W. Lee, J. Kim, M. Cho, F/ Miao, Y. Yang, H. N. Jung, M. Flavin, H. Liu, G. W. Kong, K. J. Yu, S. I. Rhee, J. Chung, B. Kim, J. W. Kwak, M. H. Yun, J. Y. Kim, Y. M. Song, U. Paik, Y. Zhang, Y. Huang, J. Rogers, “Soft network composite materials with deterministic and bio-inspired designs.” Nature Communication 6 (1), 1-11 (2015)
41.    B. H. Kim, M. S. Onses, J. B. Lim, S. Nam, N. Oh, H. Kim, K. J. Yu, J. W. Lee, J. H. Kim, S. K. Kang, C. H. Lee, J. Lee, J. H. Shin, N. H. Kim, C. Leal, M. Shim, J. Rogers “High-Resolution Patterns of Quantum Dots Formed by Electrohydrodynamic Jet Printing for Light-Emitting Diodes” Nano Letters 15 (2), 969–973 (2015)
42.    T. I. Kim, M. J. Kim, Y. H. Jung, H. Jang, C. Dagdeviren, H. A. Pao, S. J. Cho, A. Carlson, K. J. Yu, A. Ameen, H. J. Chung, S. H. Jin, Z. Ma, J. Rogers, “Thin film receiver materials for deterministic assembly by transfer printing” Chemistry of Materials 26, 3502-3507 (2104)
43.    P. K. Mohseni, A. Behnam, J. D. Wood, X. Zhao, K. J. Yu, N. C. Wang, A. Rockett, J. A. Rogers, J. W. Lyding, E. Pop, X. Li, “Monolithic III‐V nanowire solar cells on graphene via direct van der waals epitaxy.” Advanced Materials 26, 3755-3760 (2014)
44.    R. C. Webb, A. P. Bonifas, A. Behnaz, Y. Zhang, K. J. Yu, H. Cheng, M. Shi, Z. Bian, Z. Liu, Y. S. Kim, W. H. Yeo, J. S. Park, J. Song, Y. Li, Y. Huang, A. M. Gorbach, J. Rogers “Ultrathin conformal devices for precise and continuous thermal characterization of human skin” Nature Materials 12, 938–944 (2013)
45.    S. W. Hwang, D. H. Kim, H. Tao, T. Kim, S. Kim, K. J. Yu, B. Panilaitis, J. W. Jeong, F. G. Omenetto, J. Rogers “Materials and fabrication processes for high performance transient, bioresorbable electronics.” Advanced Functional Materials 23, 4087–4093 (2013)
46.    K. J. Yu, L. Gao, J. S. Park, Y. R. Lee, C. J. Cocoran, R. G. Nuzzo, D. Chanda, J.  Rogers “Light Trapping in Ultra-thin Monocrystalline Silicon Solar Cells” Advanced Energy Materials 3, 1401-1406 (2013)
47.    T. I. Kim, Y. H. Jung, H. J. Chung, K. J. Yu, N. Ahmed, C. J. Corcoran, J. S. Park, S. H. Jin, J. A. Rogers “Deterministic assembly of releasable single crystal silicon-metal oxide field-effect devices formed from bulk wafers” Applied Physics Letters 102 (18), 182104 (2013)
48.    J. C. Shin, P. K. Mohseni, K. J. Yu, S. Tomasulo, K. H. Montgomery, M. L. Lee, J. Rogers, X. Li, “Heterogeneous Integration of InGaAs Nanowires on the Rear Surface of Si Solar Cells for Efficiency Enhancement,” ACS Nano 6, 11074-11079 (2012)
49.    S. W. Hwang, T. H., D. H. Kim, H. Cheng, J. K. Song, E. Rill, A. B. M. A. B., Panilaitis, B., S. M. Won, Y. S. Kim, Y. M. Song, K. J. Yu, A. Ameen, R. Li, Y. Su, M. Yang, D. L. Kaplan, M. R. Zakin, M. J. Slepian, Y. Huang, F. G. Omenetto, J. Rogers, “A Physically Transient Form of Silicon Electronics” Science 337 (6102), 1640-1644 (2012)
50.    J. C. Shin, D. Chanda, W. Chern, K. Yu, J. Rogers, X. Li “Experimental study of design parameters in silicon micropillar array solar cells produced by soft lithography and metal-assisted chemical etching” IEEE Journal of Photovoltaics 2, 6140534, 129-133 (2012)
51.    J. C. Shin, K. H. Kim, K. J. Yu, H. Hu, L. Yin, C.-Z. Ning, J. Rogers, J. Zuo and X. Li, “InxGa1-xAs nanowires on silicon: One-dimensional heterogeneous epitaxy, bandgap engineering, and photovoltaics” Nano Letter 11, 4831-4838 (2011)
52.    D. H. Kim, N. S. Lu, R. Ma, Y. S. Kim, R. H. Kim, S. D. Wang, J. Wu, S. M. Won, H. Tao, A. Islam, K. J. Yu, T. I. Kim, R. Chowdhury, M. Ying, L. Z. Xu, M. Li, H. J. Chung, H. Keum, M. McCormick, P. Liu, Y. Zhang, F. G. Omenetto, Y. G. Huang, T. Coleman, J. Rogers, “Epidermal electronics” Science 333, 838-843 (2011)
53.    A. J. Baca*, K. J. Yu*, J. Xiao, S. Wang, J. Yoon, J. H. Ryu, D. Stevenson, R. G. Nuzzo, A. A. Rockett, Y. Huang, J. A. Rogers, “Compact monocrystalline silicon solar modules with high voltage outputs and mechanically flexible designs.” Energy and Environmental Science 3, 208-211 (2010)





Abstract for Presentation

Unconventional Flexible Electronics for Next generation Brain-machine interfaces



  Many bio-integrated electronics used clinically must maintain high levels of performance over extended periods of time. Especially, Si nano-membrane based electronics offers a reliable and robust operations of the various functions for monitoring diseases and delivering therapies. We develop new devices that integrate flexible Si nano-membrane electronics, which can deliver mult-functions inside and outside of the body. Here, in this conference, I am introducing various unconventional bio-integrated electronics based on Si nanomembrane for next-generation brain-machine interfaces.