Kwanyong Seo

Silicon Thin Film


Ulsan National Institute of Science and Technology (UNIST)

50 UNIST-gil 113-401, Ulsan, Republic of Korea 44919




Professional Experience

2022~              Professor of School of Energy and Chemical Engineering, UNIST

2017~2022      Associate Professor of School of Energy and Chemical Engineering, UNIST

2013~2017       Assistant Professor of School of Energy and Chemical Engineering, UNIST      

2009~ 2012      Harvard University, School of Engineering and Applied Sciences

                     Postdoctoral research, Advisor: Prof. Kenneth B. Crozier

2008~2009       KAIST, Dept. of Chemistry

                     Postdoctoral research, Advisor: Prof. Bongsoo Kim

2004~2005       UC Berkeley, Dept. of Chemistry

                     Visiting research, Advisor: Prof. Peidong Yang


Educational Background

2004~2008       KAIST, Ph. D. in Chemistry

                 Advisor: Prof. Bongsoo Kim           

2002~2004       KAIST, M. S. in Chemistry

                 Advisor: Prof. Bongsoo Kim           

1997~2002       Korea National University of Education, B. S. in Chemistry

                 Graduated summa cum laude


Research Interests

▪ Neutral-Color Transparent Crystalline Silicon Solar cells for Smart Window

▪ Optically Enhanced Flexible Crystalline Silicon Solar Cells

▪ Crystalline Silicon Radial Junction Photovoltaics with Microwires

▪ Dopant-Free Carrier Selective Contact Devices by Atomic Layer Deposition

▪ Crystalline Silicon based Water Splitting for H2 and H2O2.





Abstract for Presentation

Light Management with Surface Structure for High-efficiency Flexible Crystalline-Silicon Photovoltaics



  Flexible solar cells have been intensively studied in recent years for its applicability on curved or uneven surfaces. Crystalline silicon (c-Si) solar cells have been commercialized because of their low manufacturing cost, long lifespan of over 20 years, and high power-conversion efficiency (PCE) of ≤26.7%. However, the development of flexible solar cells using c-Si substrate poses an intrinsic problem resulting from its rigid material characteristic. In recent years, flexible solar cells using thin c-Si wafers have become more attractive with archiving a higher PCE than that of the emerging flexible solar cells. In addition, the mechanical flexibility can be realized using a thin c-Si film with a thickness of ≤50 mm, which is a quarter of the substrate thickness of conventional c-Si solar cells. Nonetheless, thin c-Si-based flexible solar cells faced critical challenges because of severe light absorption loss in the entire wavelength region (300–1100 nm) because of the low absorption coefficient and surface reflection of c-Si. Thus, in this talk, I will introduce high aspect-ratio Si microwires and 3-dimensional transparent optical films as promising surface structures for the efficient trapping of incident light in thin c-Si films. [1-2] Moreover, the principles regarding the improvement in light absorption of these surface structures were discussed along with the implementable strategies for maximizing PCE of the c-Si flexible solar cells. [3]





























Figure 1. Schematic image of flexible thin c-Si solar cells with microwires.





[1] I. Hwang, H. -D. Um, B. -S. Kim, M. Wober, and K. Seo, Energy & Environ. Sci., 11 (2018), 641

[2] I. Hwang, Y. Jeong, Y. Shiratori, J. Park, S. Miyajima*, I. Yoon, and K. Seo, Cell Rep. Phys. Sci., 1 (2020), 100242

[3] H. -D. Um, I. Hwang, D. Choi, and K. Seo, Acc. Mater. Res., 2, (2021), 701