Yang Yang (scientist)

Yang Yang
楊陽
Born1958 (age 67–68)
EducationNational Cheng Kung University (BS)
University of Massachusetts, Lowell (MS, PhD)
Scientific career
FieldsApplied physics
Materials science
WorkplacesUniversity of California, Los Angeles
ThesisPhotoinduced charge carrier generation and transport in polydiacetylene single crystals (1992)
Jayant Kumar
Sukant K. Tripathy
Websiteyylab.seas.ucla.edu

Yang Yang (simplified Chinese: 杨阳; traditional Chinese: 楊陽; pinyin: Yáng Yáng;[1] born 1958) is a Taiwanese-American materials scientist. He is a distinguished professor of materials science and engineering, chair of the Department of Materials Science and Engineering, and professor of bioengineering at the University of California, Los Angeles, where he holds the Carol and Lawrence E. Tannas Jr. Endowed Chair in Engineering.[2]

Yang is known for his contributions to polymer organic solar cells[3][4] and lead-halide perovskite solar cells.[5][6] He was named as one of the "World’s Most Influential Scientific Minds" by Thomson Reuters in 2016.[7][8] In 2024, he was elected a member of Academia Sinica and named a fellow of the National Academy of Inventors.[9][10] Yang is a fellow of the American Association for the Advancement of Science,[11] American Physical Society,[12] Materials Research Society,[13] Royal Society of Chemistry, and Society of Photo-Optical Instrumentation Engineers.[14]

Early life and education

Yang was born in 1958 in Taiwan, growing up in the countryside before moving to Taipei with his family at the age of 10.[15] He earned a B.S. in physics from National Cheng Kung University in 1982.[16] After graduation, he served two years of military service, a mandatory policy for qualified males in Taiwan.[15][16]

In 1985, Yang moved to the United States to begin graduate studies at the University of Massachusetts, Lowell.[15] During his graduate studies, Yang changed research groups and fields multiple times for personal reasons.[15] Initially Yang worked on studying the nonlinear optical photorefractive effect in barium titanate crystals[17][18] in the Department of Physics, earning his M.S. in Physics and Applied Physics in 1988.[2][16] He then continued his graduate studies, using deep-level transient spectroscopy to study charge carrier traps in polycrystalline silicon solar cells in the Department of Electrical Engineering.[19][20] Yang later transitioned to research on the physical properties of conductive polymers in the Department of Chemistry, earning his Ph.D. in Physics and Applied Physics in 1992 under the supervision of Prof. Jayant Kumar and Prof. Sukant K. Tripathy.[2][15][21] Yang's Ph.D. thesis was titled Photoinduced charge carrier generation and transport in polydiacetylene single crystals.[21]

Career

After graduating with his Ph.D. in 1992, Yang worked as a researcher at UNIAX Corporation in Santa Barbara, California (now DuPont Display Materials) from 1992 to 1996.[15][16] His research there addressed polymer light-emitting electrochemical cells, conductive polymer electrodes, polymer grid triodes, and organic transistors.[22]

Yang began his independent academic career in 1997 as an assistant professor of materials science and engineering at the University of California, Los Angeles.[15][16][23] He was promoted to associate professor in 1998 and full professor in 2002.[16] His appointment to the Carol and Lawrence E. Tannas Jr. Endowed Chair in Engineering was announced in 2010, and he has held the chair since 2011.[24] He became a UCLA distinguished professor in 2019 and began serving as chair of the Department of Materials Science and Engineering in 2024.[25]

From July 2019 to October 2020, Yang served as Guoqiang Chair Professor and founding dean of the School of Engineering at Westlake University in Hangzhou, China.[15][26]

Research

Organic electronics and photovoltaics

Yang's early research concerned the operation and fabrication of polymer electronic devices.[27] This work included polymer light-emitting electrochemical cells, the formation of junctions in conjugated-polymer films, polyaniline electrodes, and vertically configured organic transistors.

In 1994, Yang and Alan J. Heeger described a vertical polymer-transistor architecture.[28] In a separate study that year, they reported that transparent anodes containing conductive polyaniline, either alone or with indium tin oxide, reduced the operating voltage and increased the quantum efficiency of polymer light-emitting diodes compared with devices using indium tin oxide alone.[29] Work reported in 1995 and 1996 described polymer light-emitting electrochemical cells and the in situ formation of a light-emitting p–n junction.[30][31] At UCLA, Yang also worked on inkjet-processed polymer light-emitting devices and organic non-volatile memory based on nanoparticle–polymer films.[32][33]

His research on organic solar cells has examined active-layer morphology, donor and acceptor materials, charge transport, interface layers, transparent electrodes, and device architecture.[27][34] A 2005 paper from his group related the performance of solution-processed polymer solar cells to self-organization in polymer blends.[35][36]

In collaboration with researchers at the National Renewable Energy Laboratory, a 2006 study examined methods for measuring current–voltage characteristics under standard test conditions, including corrections for spectral mismatch.[37] Yang's group subsequently reported an inverted polymer solar cell using a low-temperature-processed cesium carbonate interlayer and later extended the architecture to tandem cells using a metal-oxide interconnection layer.[38][39] Other work addressed flexible and semitransparent organic photovoltaic devices, including applications in which light transmission is required.[34][40][41]

Perovskite and tandem photovoltaics

Yang's group began work on metal-halide perovskite solar cells around 2013.[27] Its research has focused on materials processing, interface engineering, defect states, crystal growth, ion migration, and device stability.[42][43]

A 2014 study combined controlled perovskite-film formation with yttrium-doped titanium dioxide and a polymer-modified indium tin oxide electrode. The authors reported a peak power-conversion efficiency of approximately 19.3% under reverse-bias scanning for a planar device produced through low-temperature solution processing.[44]

Yang's later research also included inverted p–i–n perovskite devices. A 2016 paper coauthored by Yang reported a solution-processed cell using nickel oxide and zinc oxide as the hole- and electron-transport layers, respectively.[45] Reviews of the field describe the inverted p–i–n perovskite architecture as originating in designs developed for organic solar cells.[46][47]

The group has also combined perovskite absorbers with other photovoltaic technologies. In 2018, Yang and collaborators reported a monolithic tandem device combining a perovskite top cell with a copper indium gallium selenide solar cell.[48][49] Later work examined wide-bandgap perovskites and stacked tandem configurations.[50]

Subsequent studies investigated surface-defect passivation, phase and interface stability, and the relationship between nucleation, strain, and photovoltaic performance.[51][52][53][54]

Other electronic materials

Yang has studied solution-processed metal-oxide thin-film transistors for displays, biosensors, and wearable electronics.[55][56][57] In collaboration with UCLA chemist Richard Kaner, he also worked on solution methods for processing large graphene sheets, including their use in transparent conductors.[58][59][60]

Awards and memberships

Yang is a highly cited researcher, and has been ranked a Highly Cited Researcher by Clarivate/Thomson Reuters since at least 2015.[61][62][63][64][65] His work has been featured on mainstream news outlets such as NPR,[66] Bloomberg,[67] Time Magazine,[68] USA Today,[69] the LA Times,[70] and the New York Times.[71] Other awards that Yang has received include:

References

  1. ↑ "UCLA台裔教授楊陽 開發鈣鈦礦太陽能電池材料獲重大突破 - 生活 (UCLA Taiwanese Professor Yang Yang has made a major breakthrough in the development of perovskite solar cell materials)". 自由時報電子報 (Liberty Times) (in Chinese). 2021-02-11. Retrieved 2021-06-03.
  2. 1 2 3 "Yang Yang. UCLA Samueli School of Engineering Profile". Retrieved 2021-06-03.
  3. ↑ Dou, Letian; You, Jingbi; Yang, Jun; Chen, Chun-Chao; He, Youjun; Murase, Seiichiro; Moriarty, Tom; Emery, Keith; Li, Gang; Yang, Yang (March 2012). "Tandem polymer solar cells featuring a spectrally matched low-bandgap polymer". Nature Photonics. 6 (3): 180–185. Bibcode:2012NaPho...6..180D. doi:10.1038/nphoton.2011.356. ISSN 1749-4893. S2CID 40653460.
  4. ↑ You, Jingbi; Dou, Letian; Yoshimura, Ken; Kato, Takehito; Ohya, Kenichiro; Moriarty, Tom; Emery, Keith; Chen, Chun-Chao; Gao, Jing; Li, Gang; Yang, Yang (2013-02-05). "A polymer tandem solar cell with 10.6% power conversion efficiency". Nature Communications. 4 (1): 1446–. Bibcode:2013NatCo...4.1446Y. doi:10.1038/ncomms2411. ISSN 2041-1723. PMC 3660643. PMID 23385590.
  5. ↑ You, Jingbi; Hong, Ziruo; Yang, Yang (Michael); Chen, Qi; Cai, Min; Song, Tze-Bin; Chen, Chun-Chao; Lu, Shirong; Liu, Yongsheng; Zhou, Huanping; Yang, Yang (2014-02-25). "Low-Temperature Solution-Processed Perovskite Solar Cells with High Efficiency and Flexibility". ACS Nano. 8 (2): 1674–1680. Bibcode:2014ACSNa...8.1674Y. doi:10.1021/nn406020d. ISSN 1936-0851. PMID 24386933.
  6. ↑ You, Jingbi; Meng, Lei; Song, Tze-Bin; Guo, Tzung-Fang; Yang, Yang (Michael); Chang, Wei-Hsuan; Hong, Ziruo; Chen, Huajun; Zhou, Huanping; Chen, Qi; Liu, Yongsheng (January 2016). "Improved air stability of perovskite solar cells via solution-processed metal oxide transport layers". Nature Nanotechnology. 11 (1): 75–81. Bibcode:2016NatNa..11...75Y. doi:10.1038/nnano.2015.230. ISSN 1748-3395. PMID 26457966.
  7. 1 2 "Yang Yang named one of 'World's Most Influential Scientific Minds'". Jan 26, 2016. Retrieved 2020-12-23.
  8. 1 2 "'World's most influential scientific minds' revealed". optics.org. 19 Jan 2016. Retrieved 2021-06-04.
  9. ↑ "2024 Academicians and Honorary Academicians Announced". Academia Sinica. July 4, 2024. Retrieved August 14, 2026.
  10. ↑ Lee, Christine Wei-li (December 10, 2024). "3 UCLA Engineering faculty members named to National Academy of Inventors". UCLA Newsroom. Retrieved August 14, 2026.
  11. 1 2 Stuart, Wolpert (November 26, 2019). "Six professors named 2019 fellows of the American Association for the Advancement of Science". UCLA. Retrieved 2020-04-08.
  12. 1 2 Kisliuk, Bill (October 19, 2015). "Yang named a fellow of American Physical Society". UCLA. Retrieved 2020-12-23.
  13. 1 2 "2015 MRS Fellows". www.mrs.org. Archived from the original on 2021-09-19. Retrieved 2020-12-23.
  14. ↑ "Complete List | Fellows". spie.org. Retrieved 2020-12-22.
  15. 1 2 3 4 5 6 7 8 Troeger, Anna (2020-08-17). "Yang Yang: Challenges and opportunities always go hand-in-hand". Advanced Science News. Retrieved 2021-06-03.
  16. 1 2 3 4 5 6 Yang, Yang (2019-08-07). "Yang Yang Lab: Two Decades in the Making". Matter. 1 (2): 312–316. doi:10.1016/j.matt.2019.07.008. ISSN 2590-2393.
  17. ↑ Schunemann, P. G.; Yang, Y.; Teng, Y.-Y.; Pollak, T. M.; Wong, C. (1988-08-01). "Effects of feed material and annealing atmosphere on the properties of photorefractive barium titanate crystals". Journal of the Optical Society of America B. 5 (8): 1702. Bibcode:1988JOSAB...5.1702S. doi:10.1364/JOSAB.5.001702. ISSN 0740-3224.
  18. ↑ Yang, Y.; Teng, Y.-Y.; Wong, C.; Schunemann, P. G.; Pollak, T. M. (1988). "Measurements of BaTiO3 crystals by two beam coupling experiment". Bulletin of the American Physical Society. 33 (8): 1809.
  19. ↑ Yang, Y.; Mil’shtein, S.; Borenstein, J. T.; Hanoka, J. I. (1990-05-28). "Deep levels in edge-defined, film-fed grown silicon solar cells". Applied Physics Letters. 56 (22): 2222–2224. Bibcode:1990ApPhL..56.2222Y. doi:10.1063/1.102950. ISSN 0003-6951.
  20. ↑ Mil'shtein, S.; Borenstein, J.T.; Hanoka, J.I.; Yang, Y. (1990). "DLTS study of EFG solar cells". IEEE Conference on Photovoltaic Specialists. pp. 721–725. doi:10.1109/PVSC.1990.111715. S2CID 122493721.
  21. 1 2 Yang, Yang (1991). Photoinduced charge carrier generation and transport in polydiacetylene single crystals (Thesis). OCLC 26756819.
  22. ↑ Yang, Yang (August 7, 2019). "Yang Yang Lab: Two Decades in the Making". Matter. 1 (2): 312–316. doi:10.1016/j.matt.2019.07.008.
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  26. ↑ Feng, Yi (December 17, 2019). "Westlake University welcomes all three deans". Archived from the original on June 5, 2021. Retrieved June 6, 2021.
  27. 1 2 3 Yang, Yang (August 7, 2019). "Yang Yang Lab: Two Decades in the Making". Matter. 1 (2): 312–316. doi:10.1016/j.matt.2019.07.008.
  28. ↑ Yang, Yang; Heeger, Alan J. (November 24, 1994). "A new architecture for polymer transistors". Nature. 372 (6504): 344–346. Bibcode:1994Natur.372..344Y. doi:10.1038/372344a0.
  29. ↑ Yang, Yang; Heeger, Alan J. (March 7, 1994). "Polyaniline as a transparent electrode for polymer light-emitting diodes: Lower operating voltage and higher efficiency". Applied Physics Letters. 64 (10): 1245–1247. Bibcode:1994ApPhL..64.1245Y. doi:10.1063/1.110853.
  30. ↑ Pei, Qibing; Yu, Gang; Zhang, Chi; Yang, Yang; Heeger, Alan J. (August 25, 1995). "Polymer Light-Emitting Electrochemical Cells". Science. 269 (5227): 1086–1088. Bibcode:1995Sci...269.1086P. doi:10.1126/science.269.5227.1086. PMID 17755530.
  31. ↑ Pei, Qibing; Yang, Yang; Yu, Gang; Zhang, Chi; Heeger, Alan J. (1996). "Polymer light-emitting electrochemical cells: In situ formation of a light-emitting p–n junction". Journal of the American Chemical Society. 118 (16): 3922–3929. Bibcode:1996JAChS.118.3922P. doi:10.1021/ja953695q. PMID 27579778.
  32. ↑ Bharathan, Jayesh; Yang, Yang (May 25, 1998). "Polymer electroluminescent devices processed by inkjet printing: I. Polymer light-emitting logo". Applied Physics Letters. 72 (21): 2660–2662. Bibcode:1998ApPhL..72.2660B. doi:10.1063/1.121090.
  33. ↑ Ouyang, Jianyong; Chu, Chih-Wei; Szmanda, Charles R.; Ma, Liping; Yang, Yang (December 2004). "Programmable Polymer Thin Film and Non-Volatile Memory Device". Nature Materials. 3 (12): 918–922. Bibcode:2004NatMa...3..918O. doi:10.1038/nmat1269. PMID 15568028.
  34. 1 2 Kisliuk, Bill (January 25, 2016). "Yang Yang named one of 'World's Most Influential Scientific Minds'". UCLA Newsroom. Retrieved August 14, 2026.
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  38. ↑ Liao, Hua-Hsien; Chen, Li-Min; Xu, Zheng; Li, Gang; Yang, Yang (2008). "Highly efficient inverted polymer solar cell by low temperature annealing of Cs2CO3 interlayer". Applied Physics Letters. 92 (17): 173303. doi:10.1063/1.2918983.
  39. ↑ Chou, Cheng-Hsuan; Kwan, Wei Lek; Hong, Ziruo; Chen, Li-Min; Yang, Yang (2011). "A Metal-Oxide Interconnection Layer for Polymer Tandem Solar Cells with an Inverted Architecture". Advanced Materials. 23 (10): 1282–1286. Bibcode:2011AdM....23.1282C. doi:10.1002/adma.201001033. PMID 20830710.
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  41. ↑ Kuipers, Dean (July 28, 2012). "UCLA's new transparent solar film could be game-changer". Los Angeles Times. Retrieved August 14, 2026.
  42. ↑ Huang, Tianyi; Tan, Shaun; Yang, Yang (2021). "Material, Phase, and Interface Stability of Photovoltaic Perovskite: A Perspective". The Journal of Physical Chemistry C. 125 (35): 19088–19096. doi:10.1021/acs.jpcc.1c05841. OSTI 1817912.
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  44. ↑ Zhou, Huanping; et al. (August 1, 2014). "Interface engineering of highly efficient perovskite solar cells". Science. 345 (6196): 542–546. Bibcode:2014Sci...345..542Z. doi:10.1126/science.1254050. PMID 25082698.
  45. ↑ You, Jingbi; Meng, Lei; Song, Tze-Bin; et al. (January 2016). "Improved air stability of perovskite solar cells via solution-processed metal oxide transport layers". Nature Nanotechnology. 11 (1): 75–81. Bibcode:2016NatNa..11...75Y. doi:10.1038/nnano.2015.230. PMID 26457966.
  46. ↑ Yi, Zijun; Li, Xin; Xiong, Yuchen; et al. (2024). "Self-assembled monolayers (SAMs) in inverted perovskite solar cells and their tandem photovoltaics application". Interdisciplinary Materials. 3 (2): 203–244. doi:10.1002/idm2.12145.
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  61. ↑ Schelenz, Robyn (2016-02-10). "UC faculty rank first among Highly Cited Researchers". University of California. Retrieved 2021-06-04.
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