Speakers

Developments on Hybrid Solar Cells Based on Solution-Processed Sb-Related Light Absorbers

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Yong Chan Choi
Daegu Gyeongbuk Institute of Science and Technology (DGIST)
Dec. 1 09:00~09:30

Abstract

Sb-related chalcogenides, such as Sb2S3, Sb2Se3, and Sb2(S,Se)3, are of particular interest as light absorbers for solar cells because of their excellent optical properties including easily tunable band-gaps by adjustable composition, high molar extinction coefficients, and large intrinsic dipole moments. Recently, the high efficiency of ~ 7.5 % in the Sb2S3-sensitized devices was achieved via a thioacetamide-assisted post-surface-treatment [1]. In addition, different methods have been suggested for improving device performance as well as reproducibility [1–5]. However, the photovoltaic performances is still restricted by strong charge recombination (low open circuit voltage VOC) and insufficient light-harvesting (low short circuit current density JSC). In this talk, I will introduce recent developments in several types of solar cells based on Sb-Chs, i.e. Sb2S3, Sb2Se3, and graded Sb2(S,Se)3. The materials are fabricated by different solutions methods, such as chemical bath deposition, single source precursor method, complex solution method, and combined method. The material properties and their device performances are highly dependent on the methods used. I will show the correlation of fabrication methods and materials with photovoltaic performances. Finally, I will briefly introduce new light absorbers of Sb chalcohalides and their application to solar cells [6]. This talk may give some clues for further efficiency improvements and enlightens us to find proper methods and potential absorbers.

[References]
[1] Choi et al., Adv. Funct. Mater. 24, 3587 (2014).
[2] Choi et al., Angew. Chem. Int. Ed. 53, 1329 (2014).
[3] Choi et al., Adv. Energy Mater. 4, 1301680 (2014).
[4] Choi et al., Adv. Funct. Mater. 25, 2892 (2015).
[5] Sung and Kim et al., J. Ind. Eng. Chem. in press (2017).
[6] Seok and Choi et al., Adv. Energy Mater. in press (2017).

 

Education

  • 2007–2011, Ph.D., Department of Physics, Chonbuk National University, Republic of Korea
    – Thesis title: “Fabrication and Characterization of Various Kinds of Metal-Oxide
    – Nanostructures by Using a Porous Anodic Alumina Template”(Advisor: Prof. Sang Don Bu, Ph.D.)
  • 2004–2006, M.S., Department of Physics, Chonbuk National University, Republic of Korea
    – Thesis title: “Study on Growth Characteristics of Self-Organized Porous Anodic
    – Aluminum Oxide” (Advisor: Prof. Sang Don Bu, Ph.D.)
  • 1998–2004, B.S., Double Major in Physics and Mathematics, Chonbuk National University, Republic of Korea Cumulative GPA: 3.80 / 4.0

 

Professional Career

  • 2015.11-Present, Senior Researcher, Convergence Research Center for Solar Energy, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, Republic of Korea.
  • 2012.11–2015.11, Postdoctoral Research Associate, Center for Solar Energy Materials, Advanced Materials Division, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Republic of Korea.
    – My postdoctoral research focused on the following topics:
    Highly efficient inorganic-organic hybrid solar cells based on metal chalcogenides, such as Sb2S3, Sb2Se3, Sb2S3-xSex, graded Sb2(S/Se)3, SnS, CuSbS2, Cu2SnS3, and more complex chalcogenides like Cu2ZnSnS4
  • 2011.03–2012.11, Postdoctoral Research Associate, Research Institute of Physics and Chemistry (RINPAC) and Multi-Functional Oxide Laboratory at Chonbuk National University, Jeonju 54896, Republic of Korea.

 

Awards and Honors

  • Honored in the 2018 edition of “MARQUIS Who’s Who in the World”, 2017
  • KRICT Creativity Award for the Three Excellent Papers: 2014 KRICT Awarding Ceremony in Korea Research Institute of Chemical Technology, Daejeon, Republic of Korea, March 23rd, 2015
  • ‘CHAE YOUNGBOK’ PAPER AWARD: The 38th KRICT Foundation Day Ceremony in Korea
    Research Institute of Chemical Technology, Daejeon, Republic of Korea, September 1st, 2014
    – Paper title: Efficient Inorganic-Organic Heterojunction Solar Cells Employing Sb2(Sx/Se1-x)3 Graded-Composition Sensitizers (Advanced Energy Materials, 2014.)
  • BEST POSTER NOMINEE (First author): 2013 Materials Research Society Fall Meeting, Boston, MA, USA, December 3rd, 2013.
    – Online available: http://www.prolibraries.com/mrs/?select=session&sessionID=2894