Yuh-Jen Cheng 程育人
Associate Research Fellow

Ways to contact me:

Phone:886-2-2787-3186 or 886-3-516-6167
Fax: 886-2787-3122
Address: Research Center for Applied Sciences, Academia Sinica
128 Sec. 2, Academia Rd., Nankang, Taipei 11529, Taiwan



Research Fields:

  • Nitride light-emitting devices.
  • Photoelectrochemical devices for energy harvesting.
  • Cavity Quantum Electrodynamics

Recent Publications:

  1. Chien-Ting Kuo, Lung-Hsing Hsu, Bo-Hsin Huang, Hao-Chung Kuo, Chien-Chung Lin, and Yuh-Jen Cheng,* “Influence of the microstructure geometry of patterned sapphire substrate on the light extraction efficiency of GaN LEDs,” Applied Optics, 55, 7387-7391 (2016). IF: 1.78
    [ DOI:10.1364/AO.55.007387 ]
  2. Yun-Jing Li, Jet-Rung Chang, Shih-Pang Chang, Bo-Wen Lin, Yen-Hsien Yeh, Hao-Chung Kuo, Yuh-Jen Cheng,* Chung-Yen Chang, “Multi-facet microrod light-emitting diode with full visible spectrum emission,” J. Display Technol. 12, 951-956 (2016). IF: 2.24
    [ DOI:10.1109/JDT.2016.2557841 ]
  3. Lung-Hsing Hsu, Chien-Ting Kuo, Jhih-Kai Huang, Shun-Chieh Hsu, Hsin-Ying Lee, Hao-Chung Kuo, Po-Tsung Lee, Yu-Lin Tsai, Yi-Chia Hwang, Chen-Feng Su, Jr-Hau He, Shih-Yen Lin, Yuh-Jen Cheng, and Chien-Chung Lin*, “InN heterojunction photodetector with extended infrared response,” Opt. Exp. 23, 31153 (2015). IF:3.14
    [ DOI:10.1364/OE.23.031150 ]
  4. Yun-Jing Li, Jet-Rung Chang, Shih-Pang Chang, Kuok-Pan Sou, Yuh-Jen Cheng,* Hao-Chung Kuo, and Chun-Yen Chang, “InGaN/GaN multiple-quantum-well nanopyramid-on-pillar light-emitting diodes,” App. Phys. Exp. 8, 042101 (2015). IF: 2.27
    [ DOI:10.7567/APEX.8.042101 ]
  5. Ming-Hsuan Tan, Hung-Ruei Tseng, Chien-Ting Kuo, Shun-Chieh Hsu, Yen-Hua Lo, Che-Pin Tsai, Yuh-Jen Cheng, and Chien-Chung Lin*, “Numerical study of a highly efficient solar cell with graded band gap design,” J. J. Appl. Phys, 54, 054301 (2015). IF:1.12
    [ DOI:10.7567/JJAP.54.054301 ]
  6. Minfeng Chen, Yun-Jing Li, Yuh-Jen Cheng,* Yai-Chung Chang, and Chun-Yen Chang, “Resonant modes of 12-fold symmetric defect free photonic quasicrystal,” Opt. Exp. 22, 2007-2012 (2014). IF:3.48
    [ DOI:10.1364/OE.22.002007 ]
  7. Yu-Cheng Hsu, Kuok-Pan Sou, Shih-Pang Chang, Kung-Shu Hsu, M. H. Shih,* Hao-Chung Kuo, Yuh-Jen Cheng, and Chun-Yen Chang, “Room temperature ultraviolet GaN metal-coated nanorod laser”, Appl. Phys. lett., 103, 191102, (2013). (IF: 3.794; SCI ranking: 15.5%)
    [ DOI:10.1063/1.4828997 ]
  8. Shih-Pang Chang, Jet-Rung Chang, Kuok-Pan Sou, Mei-Chun Liu, Yuh-Jen Cheng,* Hao-Chung Kuo, and Chun-Yen Chang, Oct. 2013, “Electrically driven green, olivine, and amber color nanopyramid light emitting diodes”, OPTICS EXPRESS, 21, 23030-23035, (2013). (IF: 3.546; SCI ranking: 4.5%)
    [ DOI:10.1364/OE.21.023030 ]
  9. Wenjing Zhang, Jing-Kai Huang, Chang-Hsiao Chen, Yung-Huang Chang, Yuh-Jen Cheng, Lain-Jong Li, “High-Gain Phototransistors Based on a CVD MoS2 Monolayer,” Adv. Mater. 25, 3456 (2013).( IF: 14.829; SCI ranking: 8.9%)
    [ DOI:10.1002/adma.201301244 ]
  10. J.-R. Chang, S.-P. Chang, Y.-J. Li, Y.-J. Cheng,* K.-P. Sou, J.-K. Huang, H.-C. Kuo, and C.-Y. Chang, “Fabrication and luminescent properties of core-shell InGaN/GaN multiple quantum wells on GaN nanopillars,” Appl. Phys. Lett. 100, 261103 (2012).
    [ DOI:10.1063/1.4731629 ]
  11. Shih-Pang Chang, Kuok-Pan Sou, Chieh-Han Chen, Yuh-Jen Cheng,* Ji-Kai Huang, Chung-Hsiang Lin, Hao-Chung Kuo, Chun-Yen Chang, and Wen-Feng Hsieh, “Lasing action in gallium nitride quasicrystal nanorod arrays, ” Opt. Exp. 20, 12457 (2012).
    [ DOI:10.1364/OE.20.012457 ]
  12. S.-P. Chang, Y.-C. Chen, J.-K. Huang, Y.-J. Cheng,* J.-R. Chang, K.-P. Sou, Y.-T. Kang, H.-C. Yang, T.-C. Hsu, H.-C. Kuo, and C.-Y. Chang, “Electrically driven nanopyramid green light emitting diode”, Appl. Phys. Lett. 100, 061106 (2012). Selected for the Feb 20, 2012 issue of Virtual Journal of Nanoscale Science & Technology.
    [ DOI:10.1063/1.3681363 ]
  13. Ming-Hua Lo, Yuh-Jen Cheng,* Mei-Chun Liu, Hao-Chung Kuo, and Shing Chung Wang “Lasing at excitonic transition in optically pumped gallium nitride nanopillars,” Opt. Exp. 19, 17960 (2011).
    [ DOI:10.1364/OE.19.017960 ]
  14. M.-C. Liu, Y.-J. Cheng,* J.-R. Chang, S.-C. Hsu, and C.-Y. Chang, “Optical properties of self assembled GaN polarity inversion domain boundary,” Appl. Phys. Lett. 99, 021103 (2011).
    [ DOI:10.1063/1.3610449 ]
  15. M.-H. Lo, Y.-J. Cheng,* H.-C. Kuo, and S.-C. Wang, “Enhanced electron-hole plasma stimulated emission in optically pumped gallium nitride nanopillars”, Appl. Phys. Lett. 98, 121101 (2011).
    [ DOI:10.1063/1.3570634 ]
  16. M.-H. Lo, Y.-J. Cheng,* H.-C. Kuo, and S.-C. Wang, “Enhanced Stimulated Emission from Optically Pumped Gallium Nitride Nanopillars”, Appl. Phys. Exp. 4, 022012 (2011).
    [ DOI:10.1143/APEX.4.022102 ]
  17. Y.-J. Chen, C.-H. Kuo, C.-J. Tun, S.-C. Hsu, Y.-J. Cheng, and C.-Y. Liu, “Fabrication of high-power InGaN-based light-emitting diode chips on pyramidally patterned sapphire substrate,“ Jpn. J. Appl. Phys., 49, 020201 (2010).
  18. M.-H. Lo, P.-M. Tu, C.-H. Wang, Y.-J. Cheng*, C.-W. Hung, S.-C. Hsu, H.-C. Kuo, H.-W. Zan, and S.-C. Wang, C.-Y. Chang, and C.-M. Liu “Defect selective passivation in GaN epitaxial growth for light emitting diode application,” Appl. Phys. Lett., 95, 211103 (2009).
  19. M.-H. Lo, P.-M. Tu, C.-H. Wang, C.-W. Hung, S.-C. Hsu, Y.-J. Cheng*, H.-C. Kuo, H.-W. Zan, S.-C. Wang, and C.-Y. Chang, “High efficiency light emitting diode with anisotropically etched GaN-sapphire interface,” Appl. Phys. Lett., 95, 041109 (2009).
  20. C. H. Chiu, P.C. Yu, H. C. Kuo, C. C. Chen, T.C. Lu, S. C. Wang, S. H. Hsu, Y.-J. Cheng*, and Y. C. Chang, “Broadband and omnidirectional antireflection employing disordered GaN nanopillars,” Optics Express, 16, 8748, (2008).
  21. Y.-J. Cheng*, "Spatially dependent spontaneous emission and Rabi oscillations of atoms in an open cavity with nonorthogonal eigenmodes," Phys. Rev. A, 77, 033835, (2008).
  22. Y.-J. Cheng*, "Spontaneous emission of an atom in a cavity with nonorthogonal eigenmodes," Phys. Rev. Lett., 97, 093601, (2006).
  23. Y.-J. Cheng*, "Quantum relaxation dynamics of magnetic moments in radiative reservoir," Phys. Rev. B, 70, 224435, 2004.
  24. Y.-J. Cheng*, and A. E. Siegman, "Generalized radiation-field quantization method and the Petermann excess-noise factor," Phys. Rev. A , 68, 043808, 2003.
  25. Y.-J. Cheng, C. G. Fanning, and A. E. Siegman, "Transverse mode astigmatism in a diode- pumped unstable-resonator Nd:YVO4 laser," Appl. Opts, 36, 1130, 1997.
  26. Y.-J. Cheng, C. G. Fanning, and A. E. Siegman, "Experimental observation of a large excess quantum noise factor in the linewidth of a laser oscillator having nonorthogonal modes," Phys. Rev. Lett., 77, 627, 1996.
  27. Y.-J. Cheng, P. L. Mussche, and A. E. Siegman, "Cavity decay rate and relaxation oscillation frequency in unconventional laser cavities," IEEE JQE, vol. 31, pp. 391-398, 1995.
  28. Y.-J. Cheng, P. L. Mussche, and A. E. Siegman, "Measurement of laser quantum frequency fluctuations using a Pound-Drever stabilization system," IEEE JQE, vol. 30, pp. 1498, 1994.


  1. Methods for fabricating group III-Nitride semiconductor film and device (U.S. and Taiwan Patents pending, 2010).
  2. Defect selective passivation in semiconductor structures (U.S. and Taiwan Patents pending, 2009)
  3. Method for fabricating semiconductor substrates and semiconductor devices (U.S. Patent No. 8133803 B2 and Taiwan Patents pending, 2009)
  4. Media contact zone with bell-shaped texturing features. (U.S. Patent No. 6,663,938, 2003).
  5. Apparatus and method to control the molecular weight distribution of a vapor. (U.S. Patent No. 6,511,702, 2003).
  6. Optical amplifier spectral tilt controllers. (U.S. Patent No. 6,483,631, 2002).
  7. Split phase high performance, high frequency, high dynamic range interferometer. (U.S. Patent No. 5,999,261, 1999).