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Dive into the research topics where Si-Nae Park is active.

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Featured researches published by Si-Nae Park.


Journal of Materials Chemistry | 2016

A band-gap-graded CZTSSe solar cell with 12.3% efficiency

Kee-Jeong Yang; Dae-Ho Son; Shi-Joon Sung; Jun-Hyoung Sim; Youngill Kim; Si-Nae Park; Dong-Hwan Jeon; Jung-Sik Kim; Dae-Kue Hwang; Chan-Wook Jeon; Dahyun Nam; Hyeonsik Cheong; Jin-Kyu Kang; Dae-Hwan Kim

Although Cu2ZnSn(S,Se)4 (CZTSSe) has attracted attention as an alternative to CuInGaSe2 (CIGS) as an absorber material in solar cells, its low efficiency is a serious shortcoming preventing its commercialization. To realize a high-efficiency CZTSSe solar cell, improved grain crystallinity, inhibited secondary-phase formation, controlled defect generation, adequate Na content, and band gap grading are required in the absorber layer. Few studies have focused specifically on band gap grading. In this study, a method of using SeS2, a new potential chalcogenization source material, to control the S and Se contents in a CZTSSe absorber and its effects were investigated. Using an appropriate SeS2/Se weight ratio, band gap grading was realized within the depletion region. By increasing the value of VOC through band gap grading in the depletion region, a record VOC deficit of 0.576 V was achieved. Furthermore, the possibility of enhancing JSC through the formation of a type-inverted n-type phase at the absorber surface in response to an appropriate alignment of the conduction-band minimum energy level and the Fermi energy pinning level is discussed. By introducing the chalcogenization source material SeS2 during the annealing process, CZTSSe solar cells with a maximum efficiency of 12.3% were obtained.


RSC Advances | 2014

Solution-processed Cu2ZnSnS4 absorbers prepared by appropriate inclusion and removal of thiourea for thin film solar cells

Si-Nae Park; Shi-Joon Sung; Dae-Ho Son; Dae-Hwan Kim; Mungunshagai Gansukh; Hyeonsik Cheong; Jin-Kyu Kang

We studied how to effectively add/remove organic chemicals to/from CZTS precursor thin films to prepare uniform CZTS thin films that show optimal properties. We used multi-functional thiourea, as both a stabiliser and a source of sulphur, to prepare the precursor solutions. This is because it forms complexes with metal chlorides, which stabilise the CZTS precursor solutions and enable CZTS thin films to be spin-coated onto substrates thereby enabling fabrication of CZTS absorbers. However, the excess thiourea, required to stabilise the CZTS precursor solutions, induced the formation of a ZnS secondary phase in the CZTS thin films, which deteriorated the photovoltaic properties of the CZTS solar cells. We therefore pre-annealed the thin films to inhibit ZnS formation. We used the thiourea-stabilized CZTS precursor solutions and simple solution processing techniques to prepare CZTS precursor thin films, and optimized the pre-annealing temperature to fabricate CZTS solar cells that showed 5.29% efficiency.


Optical Materials Express | 2013

Particulate counter electrode system for enhanced light harvesting in dye-sensitized solar cells

Kyoseung Sim; Shi-Joon Sung; Si-Nae Park; Dae-Hwan Kim; Jin-Kyu Kang

A particulate counter electrode with photo scattering and redox catalytic properties is applied to dye sensitized solar cells (DSSCs) in order to improve photo conversion efficiency and simplify the assembly process. Our particulate counter electrode acts as both a photo reflecting layer and a catalyst for reduction of electrolyte. The reflective and catalytic properties of the electrode are investigated through optical and electrochemical analysis, respectively. A short circuit current density enhancement is observed in the DSSCs without the need to add an additional reflecting layer to the electrode. This leads to a simplified assembly process.


Chemistry of Materials | 2015

Growth and Device Characteristics of CZTSSe Thin-Film Solar Cells with 8.03% Efficiency

Dae-Ho Son; Dae-Hwan Kim; Si-Nae Park; Kee-Jeong Yang; Dahyun Nam; Hyeonsik Cheong; Jin-Kyu Kang


Nanoscale | 2015

Nanostructured p-type CZTS thin films prepared by a facile solution process for 3D p–n junction solar cells

Si-Nae Park; Shi-Joon Sung; Jun-Hyoung Sim; Kee-Jeong Yang; Dae-Kue Hwang; JunHo Kim; Gee Yeong Kim; William Jo; Dae-Hwan Kim; Jin-Kyu Kang


Solar Energy Materials and Solar Cells | 2015

Influence of sulfate residue on Cu2ZnSnS4 thin films prepared by direct solution method

Viet Tuyen Nguyen; Dahyun Nam; Mungunshagai Gansukh; Si-Nae Park; Shi-Joon Sung; Dae-Hwan Kim; Jin-Kyu Kang; Cong Doanh Sai; Thi Ha Tran; Hyeonsik Cheong


Journal of Nanoscience and Nanotechnology | 2015

Effects of Ta Addition Through Co-Sputtering on the Electrical Characteristics of Indium Tin Oxide Thin Film Transistors.

Si-Nae Park; Dae-Ho Son; Shi-Joon Sung; Jin-Kyu Kang; Dae-Hwan Kim


Journal of Nanoscience and Nanotechnology | 2015

Effect of Sulfurization Temperature on Solution-Processed Cu2ZnSnS4 Thin Films.

Si-Nae Park; Shi-Joon Sung; Dae-Ho Son; Dae-Hwan Kim; Jun-Hyoung Sim; Jin-Kyu Kang


Journal of Nanoscience and Nanotechnology | 2014

Effect of Ta addition of co-sputtered amorphous tantalum indium zinc oxide thin film transistors with bias stability.

Dae-Ho Son; Dae-Hwan Kim; Si-Nae Park; Shi-Joon Sung; Jin-Kyu Kang


Journal of Nanoscience and Nanotechnology | 2013

Effects of addition of Ta and Y ions to InZnO thin film transistors by sol-gel process.

Dae-Ho Son; Dae-Hwan Kim; Jung-Hye Kim; Si-Nae Park; Shi-Joon Sung; Jin-Kyu Kang

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Dae-Hwan Kim

Daegu Gyeongbuk Institute of Science and Technology

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Jin-Kyu Kang

Daegu Gyeongbuk Institute of Science and Technology

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Shi-Joon Sung

Daegu Gyeongbuk Institute of Science and Technology

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Dae-Ho Son

Daegu Gyeongbuk Institute of Science and Technology

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Kee-Jeong Yang

Daegu Gyeongbuk Institute of Science and Technology

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Jun-Hyoung Sim

Daegu Gyeongbuk Institute of Science and Technology

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Dae-Kue Hwang

Daegu Gyeongbuk Institute of Science and Technology

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