08 AprMaterial Science and Engineering Graduate Seminar(ZOOM WEBINAR) Design of Emerging Optoelectronic Materials via Defect Engineering
(ZOOM WEBINAR) Design of Emerging Optoelectronic Materials via Defect Engineering
  • Dr. Hong-Tao Sun
  • International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Japan
  • Thursday, April 08, 2021
  • 12:00 PM - 01:00 PM
  • Zoom Webinar
2021-04-08T12:002021-04-08T13:00Asia/Riyadh(ZOOM WEBINAR) Design of Emerging Optoelectronic Materials via Defect EngineeringZoom WebinarMazen E. Mero

Registration Link: 
https://kaust.zoom.us/webinar/register/WN_N36MRLMyR-O1_6S3QY_caA


ABSTRACT: 
Defects in crystalline materials, either intrinsic or extrinsic, play an important role in the performance of optoelectronic materials,[1] and thus defect engineering has long been adopted as a powerful tool for tuning the properties of targeted material systems. Intrinsic point defects, such as atomic vacancies, antisite defects, and interstitial defects, can introduce intrinsic structural disorder, which can significantly affect the carrier recombination process and the stability of materials and devices. Extrinsic defects, like doping of foreign ions into a matrix, has been enabled us to master semiconductor technology by controlling over the type (p or n) and density of electrical carriers (electrons or holes) in microelectronics and optoelectronics. The arguably most stunning example that originates from the elaborate control of dopants is doped silicon, which forms the foundation of present-day microelectronics; the other example is doping various metal ions into the present-day widely studied halide perovskites,[1,2] which enables the discovery of some unusual optoelectronic properties. Intentional exploitation of defect engineering for fine-tuning the optoelectronic properties also involves the creation of some unconventional coordination geometry in metastable phases to produce unusual optically active centers. In this talk, I will report our experimental and theoretical works regarding the use of defect engineering to design and synthesize a range of optoelectronic materials including halide perovskites, [1-6] bismuth-activated near infrared luminescent materials,[7] and UVC persistent phosphors.[8]

References 

  1. Y. Zhou, J. Chen, O. M. Bakr, and H.-T. Sun, Chem. Mater. 2018, 30, 6589−6613.
  2. Z. Yong, S. Guo, J. Ma, J. Zhang, Z. Li, Y. Chen, B. Zhang, Y. Zhou, J. Shu, J. Gu, L. Zheng, O. M. Bakr, H.-T. Sun, J. Am. Chem. Soc. 2018, 140, 9942-9951.
  3. B. Zhang, S. Yuan, J. Ma, Y. Zhou, J. Hou, X. Chen, W. Zheng, H. Shen, X. Wang, B. Sun, O. M. Bakr, L.-S. Liao, and H.-T. Sun, J. Am. Chem. Soc. 2019, 141, 15423-15432.
  4. Q. Liu, J. Yin, B. Zhang, J. Chen, Y. Zhou, L. Zhang, L. Wang, Q. Zhao, J. Hou, J. Shu, B. Song, N. Shirahata, O. M. Bakr, O. F. Mohammed, and H.-T. Sun, J. Am. Chem. Soc. 2021, DOI: 10.1021/jacs.1c01049.
  5. J. Ma, J. Yin, Y. Chen, Q. Zhao, Y. Zhou, H. Li, Y. Kuroiwa, C. Moriyoshi, Z. Li, O. M. Bakr, O. F. Mohammed, and H.-T. Sun, ACS Mater. Lett. 2019, 1, 185-191.
  6. J. Ma, J. Chen, J. Yin, B. Zhang, Q. Zhao, Y. Kuroiwa, C. Moriyoshi, L. Hu, O. M. Bakr, O. F. Mohammed, and H.-T. Sun, ACS Mater. Lett. 2020, 2, 367-375.
  7. B. Liu, Z. Zhang, K. Zhang, Y. Kuroiwa, C. Moriyoshi, H. Yu, C. Li, L. Zheng, L. Li, G. Yang, Y.Zhou, Y. Fang, J. Hou, Y. Matsushita, H.-T. Sun, Angew. Chem. Int. Ed. 2016, 55, 4967-4971.
  8. Y. Yang, Z. Li, J.  Zhang, Y. Lu, S. Guo, Q. Zhao, X. Wang, Z. Yong, H. Li, J. Ma, Y. Kuroiwa, C. Moriyoshi, L. Hu, L. Zhang, L. Zheng, H.-T. Sun, Light: Science & Applications 2018, 7, 88.


BIOGRAPHY:
 Dr. Hong-Tao Sun is currently a Principal Researcher at Nanoparticle Group, International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Japan. He received his Ph.D. degree in Materials Science from Chinese Academy of Sciences. Before joining NIMS, Dr. Sun worked as a Professor in Soochow University, China, and led a group of Inorganic Chemistry and Optoelectronic Materials. His current research interests include synthetic chemistry and defect chemistry of colloidal nanocrystals, the structure-property relationships of functional materials, and the applications of emerging materials for LEDs, solar cells and biomedicine. The accomplishments of Dr. Sun have resulted in more than 130 articles, and a number of these papers are published in high impact scientific journals including JACS, Angew. Chem., and Light: Science & Applications.


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  • Mazen E. Mero

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