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Assistant Professor of Engineering
jifeng.liu@dartmouth.edu
Education
- B.S./M.S., Materials Science and Engineering, Tsinghua University, China 2001
- Ph.D., Materials Science and Engineering, Massachusetts Institute of Technology 2006
Research Interests
Optoelectronic materials and devices; integrated nanophotonics for energy-efficient Information Technologies (Green IT); Nanomaterials and nanostructures for solar cells and thermophotovoltaic cells; Infrared and ultraviolet optical sensors
Current Research Projects
- Band-engineered semiconductors and phosphor materials for efficient solid-state lighting
- Environmental-benign Group IV (Si, Ge, Sn) nanomaterials
- High-temperature solar absorbers for solar thermal systems
- Integrated nanophotonics devices for high-bandwidth, ultra-low energy photonic data links
- Rare-earth selective emitters for high efficiency TPV systems
- Self-assembled nanophotonic structures for light trapping in solar cells
- Visible-blind and solar-blind ultraviolet detectors for flame and oil spill detection
Teaching
Selected Publications
- X.X. Wang, J.F. Liu, "Step-Coupler for efficient waveguide coupling to Ge/Si avalanche photodetectors," IEEE Photonics Technology Letters 23, 146 (2011)
- X. Sheng, J.F. Liu, I. Kozinsky, A.M. Argawal, J. Michel, and L.C. Kimerling, "Design and non-lithographic fabrication of light trapping structures for thin film silicon solar cells," Advanced Materials DOI: 10.1002/adma.201003217 (early view, published online Dec. 13, 2010)
- X. Sheng, J.F. Liu, N. Coronel, A. Agarwal, J. Michel, and L.C. Kimerling, "Integration of self-assembled alumina and distributed Bragg reflector for light trapping in Si photovoltaic devices," IEEE Photonics Technology Letters 22, 1394 (2010)
- J. Michel, J.F. Liu, and L.C. Kimerling. "High performance Ge-on-Si photodetectors," Nature Photonics 4, 527 (2010)
- J.F. Liu, X.C. Sun, L.C. Kimerling and J. Michel, "A Ge-on-Si laser operating at room temperature”, Optics Letters 35, 679 (2010)
- J.F. Liu, X.C. Sun, L.C. Kimerling and J. Michel, "Direct gap Optical Gain of Ge-on-Si at room temperature," Optics Letters 34, 1738 (2009)
- X.C. Sun, J.F. Liu, L.C. Kimerling and J. Michel, "Room-temperature direct bandgap electroluminesence from Ge-on-Si light-emitting diodes," Optics Letters 34, 1198 (2009)
- J.F. Liu, M. Beals, A. Pomerene, S. Bernardis, R. Sun, J. Cheng, L. C. Kimerling and J. Michel, "Waveguide-integrated, ultra-low energy GeSi electro-absorption modulators," Nature Photonics 2, 433 (2008)
- J.F. Liu, X.C. Sun, D. Pan, X.X. Wang, L.C. Kimerling, T.L. Koch and J. Michel, "Tensile-strained, n-type Ge as a gain medium for monolithic laser integration on Si," Optics Express 15, 11272 (2007)
- D. Ahn, C.Y. Hong, J.F. Liu, M. Beals, L.C. Kimerling, and J. Michel, "High performance, waveguide integrated Ge photodetectors," Optics Express 15, 3916 (2007)
Awards
- NSF CAREER Award, 2012
- Materials Research Society (MRS) Graduate Student Gold Award, 2004 MRS Fall Meeting
Selected Patents
- Dong Pan, Dong Pan, Jifeng Liu, Lionel C. Kimerling, James F. McMillan, Michael D. Sockin, and Chee Wei Wong, “Ultrafast Ge/Si resonator-based modulators for optical data communications in silicon photonics”, U.S. Patent No. 7,840,099
- Dong Pan, Jifeng Liu, Jurgen Michel, John Yasaitis and Lionel C. Kimerling, "Method of fabricating Ge or SiGe/Si waveguide or photonic crystal structures by selective growth," U.S. Patent No. 7,801,406
- Jifeng Liu, Dong Pan, Lionel C. Kimerling, Jurgen Michel and Sajan Saini, "Method and Structure of Germanium Laser on Silicon," U.S. Patent No. 7,596,158
- Donghwan Ahn, Jifeng Liu, Jurgen Michel and Lionel C. Kimerling, "Vertically-integrated waveguide photodetector apparatus and related coupling methods," U.S. Patent No. 7,305,157
- Donghwan Ahn, Jifeng Liu, Jurgen Michel and Lionel C. Kimerling, "Integrated waveguide photodetector apparatus with matching propagation constants and related coupling methods," U.S. Patent No. 7,266,263
- Kazumi Wada, Lionel C. Kimerling, Yasuhiko Ishikawa, Douglas D. Cannon, and Jifeng Liu, "Method of Forming Ge Photodetectors," U.S. Patent No. 6,946,318
- Kazumi Wada, Douglas D. Cannon, Jifeng Liu, Lionel C. Kimerling, and Yasuhiko Ishikawa, "Ge Photodetectors," U.S. Patent No. 6,812,495
Professional Activities
- Organization Committee, The Electrochemical Society (ECS) SiGe, Ge and Related Compounds Symposium
- Session Chair in silicon photonics and solar materials at ECS, IEEE Photonics Society and OSA conferences
- Vice Chair, Photonic Devices and Optoelectronic Integration Sub-Committee, 2012 (43rd) International Conference on Solid State Device and Materials
- Technical Program Committee Member, 2012 International SiGe Technology and Device Meeting
News
Dartmouth Engineering Professor Receives NSF’s CAREER Award
January 11, 2013Thayer team redesigns solar tech.
The Dartmouth
February 9, 2012Thin Film Intelligence Brief
PV Insider
January 31, 2012Solar-Tectic LLC gets exclusive license for manufacturing single c-Si thin-films on ordinary glass
Global Solar Technology
January 27, 2012Chip-level advances that may change computing
Computerworld
September 13, 2011Germanium-on-silicon laser for 21st century data links
IEEE Technology News
March 10, 2011Power, speed, and highlights of IEDM 2010
Semiconductor Today
December 13, 2010The beginning of truly integrated lasers?
Optics and Photonics News, Optical Society of America
May 1, 2010‘Totally new physics’ yields first germanium laser
Photonics Spectra
April 1, 2010NOVELTIES: An Express Lane From Camera to Computer
The New York Times
March 14, 2010Germanium Lines up Bands for Laser Action
Semiconductor Today
February 8, 2010New Germanium Laser Better for Computing
CNET News
February 5, 2010Germanium Laser Breakthrough Brings Optical Computer Closer
WIRED
February 4, 2010MIT researchers build first germanium laser
MIT
February 4, 2010
In Dartmouth Engineer Magazine
- Kudos
Winter 2013 -
Kudos
Summer 2012 -
The New Guard: Thayer's eight new tenure-track assistant professors will influence the next few generations of students.
Winter 2011 -
Cummings and Goings: New and Departing Profs
Summer 2010
Video
Seminar: Nanophotonics for Energy Applications