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Jeehwan Kim(ȯ)
Ͻ 2015. 8. 4(ȭ)  16:00~17:00
Nanotechnology for Photovoltaics: Strategies for Scalable Manufacturing of High-Efficiency Solar Cells

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1.  : Nanotechnology for Photovoltaics: Strategies for Scalable Manufacturing of High-Efficiency Solar Cells
2.  : Jeehwan Kim (Massachusetts Institute of Technology)
3.  : 2015 8 4(ȭ), 16:00~17:00
4.  : б 301 1419ȣ
5.  :

      Over the past few decades, the levelized cost of energy for solar cells has decreased rapidly leading to the global average solar module cost of ~1 $/W. However, despite these advances, grid parity remains a goal for the future. There is still a substantial room for improving the solar cell efficiency, as the performance gap between the best research cell and the Shockley–Queisser limit is still 20-50%. In today's talk, I will discuss how nanotechnology can play a role in reducing both this performance gap and the module cost by increasing the efficiency of low-cost solar cells. The following strategies will be presented: i) Geometry modification for efficiency enhancement via constructing high aspect-ratio three-dimensional solar cells, which led to a record-efficiency 3D thin film Si solar cell, ii) Work-function engineering via plasmonic gold nanodots, where we demonstrated for the first time dual-function nanodots at the solar cell/transparent conducting oxide interface for light trapping and work-function engineering, iii) Graphene-based single-crystalline layer-transfer, where we were the first to demonstrate multiple growths/transfers of single-crystalline films by reusing graphene as an epitaxial seed layer and release layer, and iv) Monolithic integration of organic-inorganic devices, where we have demonstrated a record-efficiency organic-inorganic hybrid tandem solar cell. At the end of talk, I will discuss how we can manage those strategies towards achieving grid parity.

6.   :

     Jeehwan Kim is an assistant professor of Mechanical Engineering at the Massachusetts Institute of Technology. He received his B.S. from Hongik University in 1997, his M.S. from Seoul National University in 1999, and his Ph.D. from UCLA in 2008. Before joining MIT in 2015, he has been a Research Staff Member at IBM T.J. Watson Research Center in Yorktown Heights, NY since 2008, where he has led multiple projects including thin film solar cells, graphene electronics, and next generation CMOS. Many of his patents in photovoltaic technologies have been licensed and transferred to solar companies. Prof. Kim is a recipient of multiple IBM high value invention achievement awards. In 2012, he was appointed a “Master Inventor” of IBM for the recognition of his active IP generation and commercialization of his research. He is an inventor of 120 issued/pending US patents and an author of 30 articles in journals (a first-author of 20 journal articles including Science, Nature Communications, and Advanced Materials). His research covers topics ranging from basic material physics/mechanics to scalable manufacturing of electronic/photonic/photovoltaic devices. His current interests are in graphene-based layer-transfer, large-scale fabrication of nanostructured thin film solar cells, single-crystalline 2D-material heterostructures, and III-V CMOS integration.

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