세미나안내

[2014 04 02] 정기세미나 4th

Atomic Two-Dimensional Materials and Their Energy Conversion Processes

MSE Graduate Students and Researchers

관리자 | 2014.04.01 08:58 | 조회 2701


Reception: MSE Graduate Students and Researchers

Reference: MSE Professors

Subject: The 4th Seminar - Spring Semester, 2014 

 

 Date: 2014. 4. 2(Wed), 17:00 ~ 18:15

 Place: Engineering Building, Room.202 Multimedia Room

 Title: Atomic Two-Dimensional Materials and Their Energy Conversion Processes

 Speaker: Prof. Moon-Ho Jo (MSE, POSTECH)

Host of a Seminar: Prof. Hyunsang Hwang

Speaker Language: ENGLISH

 

Abstract:

Two-dimensional (2D) atomic crystals serve as innovative energy conversion platforms, as evident in the recent examples of light-to-electricity conversion in large-gap chalcogenide monolayers by the 2D photonic and photovoltaic effects. In this talk, we discuss the recent research efforts of our laboratory for (1) growth of such 2D atomic crystal heterostructures, including large band-gap semiconducting chalcogenide and narrow-band gap metallic chalcogenide monolayers and (2) investigation of associated photon energy conversion/transport processes in the atomic scale. Specifically, we first demonstrate heteroepitaxial (vertical) stacking and (lateral) stitching of such chalcogenide monolayers by manipulation of 2D nucleation kinetics during a sequential vapor-phase growth. We verified by monolayer-resolved optoelectronic spectroscopy that strong interlayer optical and electrical coupling prevails in such 2D heterostructures via interlayer band-mixing in the visible range, which provide practical implication for unprecedentedly efficient solar cells. We then report another interesting energy conversion process, heat-to-electricity conversion, in narrow gap chalcogenide monolayers. By scanning photo-induced thermoelectric-current imaging in the monolayer-resolved manner, we show that opto-thermoelectric conversion is substantial by interlayer motion of hot carriers through 2D subbands and topological surface states. Our designer growth of vertical and lateral 2D heterojunctions and discovery on associated 2D energy conversion processes at the monolayer limit, combined, provide a whole new design rule for the highly efficient energy conversion vehicle at the ultimate size limit.

 

 

Department of Materials Science and Engineering

 



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