Speaker: Oki Gunawan
Affiliation: IBM T. J. Watson Research Center, USA
Abstract Details: Photovoltaics (PV) technology is one of the leading candidates for large scale and renewable energy source in the near future. At IBM, we recently developed kesterite Cu2ZnSn(Se,S)4 (CZTSSe)-based solar cell, an emerging thin film PV technology unrestrained by material availability or toxicity issues suffered by other leading technologies such as CuInGaSe (CIGS) and CdTe. We recently demonstrated a CZTSSe cell with world record efficiency of 10.1% and performed various electrical characterization techniques to identify the key performance bottlenecks. I will draw various comparisons between CZTSSe and the well established CIGS technology to gain insights to the current performance limitations in CZTSSe. These findings help to identify key areas of improvements to realize a high performance, tera (1012) watt scale CZTSSe PV technology in the near future.

About The Speaker: Oki Gunawan, received PhD from Dept. of Electrical Engineering, Princeton University and M. Eng and B. Eng from Nanyang Technological University also in Electrical Engineering. He is currently a Research Staff Member in Photovoltaics Science and Technology, at IBM Thomas J Watson Research Center, Yorktown Heights NY. His research activities encompass several areas like optoelectronics, valley-based electronics or “valleytronics”, nanowire CMOS and solar cell, solar cell characterization and currently CZTSSe thin film solar cell. At IBM, he led efforts to develop IBM-PVX system, a new software system for advanced solar cell characterization and he is in charge of electrical device characterization and diagnostics activities. His works have been published, among others in, Nature Physics, Physical Review Letters, Physical Review B, Nano Letters, Applied Physics Letter and Progress in Photovoltaics.

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