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Professor Jih-Shang Hwang completed his Ph.D. from the Department of Physics, National Cheng Kung University in 1998. His doctoral career research topics cover the low-temperature physical properties of superconductivity and magnetic materials and the automatic measurement of low-temperature specific heat. Noticeably, the low temperature specific heat measurement method was employed by Quantum Design company as a product , and this product won the 1995 R&D 100 award.

From 1999 to 2001, he joined the jointed advanced materials laboratory (AML) as a post doctor under Professor Chen Kuei-Hsien(IAMS, Academia Sinica) and Professor Li-Chyong Chen (CCMS, NTU), and began to study in nitride semiconductors and nanomaterials. During this period, he used the programming instrument control he learned in the doctoral time to help in the establishment of a field emission measurement system. Later, he independently set up a fully automatic metal organic chemical vapor deposition system (MOCVD), successfully growing epitaxial nitride films. The MOCVD system also helps to grow nitride nanowires. During this period, he was responsible for maintaining a Raman measurement system and were assigned to set up a photoluminescence measure (PL) measurement system, and thus became an expert in the Raman spectroscopy and PL study. In addition, he successfully predicted a growth mechanism using silicon carbide as a nano-mask and confirmed it with HRTEM. This nano-mask growth mechanism can be generally applied to most solid materials and has been verified and patented.

In 2001, Dr. Hwang joined the Institute of Optoelectroni Sciences, NTOU, as an assistant professor. At the beginning, his research direction was the use of atomic force microscope for nano-oxidation. He led the laboratory students to discover that gold plating can increase the effect of nano-oxidation, which was also his main work when he was promoted to associate professor. Later, under his leadership, the laboratory team not only confirmed that light can help nano-oxidation, they also for the first time successfully oxidized indium nitride and gallium oxide using AFM. They perform nano-oxidation on zinc, and found that different oxide heights can show different colors. In other fields, he and his laboratory team also discovered a method for making surface-enhanced Raman substrates, which are very stable and can be repeatedly used after ultrasonic cleaning.

In 2006, Hwang was promoted to associate professor. After that, his research direction gradually turned to solar cells. He has participated in the research of organic solar cells and the development of CZTSSe solar cells in AML, and has accumulated a lot of experience. During this period, he tried to study electroless silicon nanowire solar cells and obtained some important results of radial junction silicon nanowire solar cells.

In 2010, in response to the trend of declining birthrates, Prof. Hwang and Director Tai-Yuan Lin tried to promote the establishment of undergraduate program for their institute. Hwang was responsible for drafting the plan, and Director Lin was responsible for administrative promotion. Unfortunately, due to insufficient communication, the case was withdrawn at the University-level meeting halfway through.

After being promoted to professor in 2011, Hwang began to study the production of traditional silicon solar cells and changed it to a non-toxic and non-hydrofluoric acid green process (waste liquid can be made into fertilizer). Later, luckily, Hwang and his team discovered a method to distinguish stacking order as well as layers of graphene through the Raman spectroscopic mapping. Later, he became interested in the atmospheric pressure plasma jet (APPJ) and began to use APPJ to grow semiconductor films (titanium oxide, zinc oxide) and study its photocatalytic activities. The APPJ was employed to form ZnO/GaN LEDs for exciting CdSe quantum dots, which could be useful in micro-LED technology. In 2020, Hwang and his team began to study laser 3D printing of silver and high-quality CuO growth. The later could be use in solar cells and optical sensors.

In August 2015, he was appointed as the first chair of the Undergraduate Program in Electronics and Materials Technology. Later in October, he was also appointed as the director of the Institute of Optoelectronic Sciences.

In August 2018, the Department of Optoelectronics and Materials Technology was formally established. He was appointed the first chair of the department. After almost one year, due to the completion of the phased tasks of the department and his personal health degradation, Hwang decided to resigned from the chair. After his resignation was approved, he stepped down on July 31, 2019.