- Dye- and Quantum-dot sensitized solar cells
Room 131-413

Education & Career

Publications (International)
"The Construction of Tandem Dye-Sensitized Solar Cells from Chemically-Derived Nanoporous Photoelectrodes"
Hongsik Choi, Taehyun Hwang, Sangheon Lee, Seunghoon Nam, Joonhyeon Kang, Byungho Lee, and Byungwoo Park*
J. Power Sources 274, 937 (2015).
"Oxygen-Controlled Seed Layer in DC Sputter-Deposited ZnO:Al Substrate for Si Thin-Film Solar Cells"
Seung-Yoon Lee, Taehyun Hwang, Woojin Lee, Sangheon Lee, Hongsik Choi, Seh-Won Ahn, Heon-Min Lee, and Byungwoo Park*
IEEE J. Photovolt. 5, 473 (2015).
"Quantitative Analyses of Damp-Heat-Induced Degradation in Transparent Conducting Oxides"
Jae Ik Kim, Woojin Lee, Taehyun Hwang, Jongmin Kim, Seung-Yoon Lee, Suji Kang, Hongsik Choi, Saeromi Hong, Helen Hejin Park, Taeho Moon,* and Byungwoo Park*
Sol. Energ. Mat. Sol. C. 122, 282 (2014).
"Analysis of a-Si:H/TCO Contact Resistance for the Si Heterojunction Back-Contact Solar Cell"
Seung-Yoon Lee, Hongsik Choi, Hongmei Li, Kwangsun Ji, Seunghoon Nam, Junghoon Choi, Seh-Won Ahn, Heon-Min Lee, and Byungwoo Park*
Sol. Energ. Mat. Sol. C. 120, 412 (2014).
"Oriented Hierarchical Porous TiO2 Nanowires on Ti Substrate: Evolution of Nanostructures for Dye-Sensitized Solar Cells"
Byungho Lee,+ Jae Ik Kim,+ Sangheon Lee, Taehyun Hwang, Seunghoon Nam, Hongsik Choi, Kunsu Kim, Jaewon Kim, and Byungwoo Park*
Electrochim. Acta 145, 231 (2014).
"Improving Scattering Layer through Mixture of Nanoporous Spheres and Nanoparticles in ZnO-Based Dye-Sensitized Solar Cells"
Chohui Kim, Hongsik Choi, Jae Ik Kim, Sangheon Lee, Jinhyun Kim, Woojin Lee, Taehyun Hwang, Suji Kang, Taeho Moon,* and Byungwoo Park*
Nanoscale Res. Lett. 9, 295 (2014).
"Electronic Effect in Methanol Dehydrogenation on Pt Surfaces: Potential Control during Methanol Electrooxidation"
Joonhyeon Kang, Seunghoon Nam, Yuhong Oh, Hongsik Choi, Sungun Wi, Byungho Lee, Taehyun Hwang, Saeromi Hong, and Byungwoo Park*
J. Phys. Chem. Lett. 4, 2931 (2013).
"Graded Bandgap Structure for PbS/CdS/ZnS Quantum-Dot-Sensitized Solar Cells with a PbxCd1-xS Interlayer"
Jongmin Kim, Hongsik Choi, Changwoo Nahm, Chohui Kim, Jae Ik Kim, Woojin Lee, Suji Kang, Byungho Lee, Taehyun Hwang, Helen Hejin Park, and Byungwoo Park*
Appl. Phys. Lett. 102, 183901 (2013).
"A Simple Template-Free 'Sputtering Deposition and Selective Etching' Process for Nanoporous Thin Films and Its Application to Dye-Sensitized Solar Cells"
Changwoo Nahm, Hongsik Choi, Jongmin Kim, Sujin Byun, Suji Kang, Taehyun Hwang, Helen Hejin Park, Jaejung Ko,* and Byungwoo Park*
Nanotechnology 24, 365604 (2013).
"The Role of ZnO-Coating-Layer Thickness on the Recombination in CdS Quantum-Dot-Sensitized Solar Cells"
Hongsik Choi, Jongmin Kim, Changwoo Nahm, Chohui Kim, Seunghoon Nam, Joonhyeon Kang, Byungho Lee, Taehyun Hwang, Suji Kang, Dong Joo Choi, Young-Ho Kim,* and Byungwoo Park*
Nano Energy 2, 1218 (2013).
"The Effect of TiO2-Coating Layer on the Performance in Nanoporous ZnO-Based Dye-Sensitized Solar Cells"
Chohui Kim, Jongmin Kim, Hongsik Choi, Changwoo Nahm, Suji Kang, Sungjun Lee, Byungho Lee, and Byungwoo Park*
J. Power Sources 232, 159 (2013).
"Review Paper: Toward Highly Efficient Quantum-Dot- and Dye- Sensitized Solar Cells"
Hongsik Choi, Changwoo Nahm, Jongmin Kim, Chohui Kim, Suji Kang, Taehyun Hwang, and Byungwoo Park*
Curr. Appl. Phys. 13, S2 (2013).
"Photoluminescence Enhancement by Surface-Plasmon Resonance: Recombination-Rate Theory and Experiments"
Changwoo Nahm,+ Dae-Ryoung Jung,+ Jongmin Kim, Seunghoon Nam, Hongsik Choi, Saeromi Hong, Taehyun Hwang, Taeho Moon,* and Byungwoo Park*
Appl. Phys. Express 6, 52001 (2013).
"The Role of a TiCl4 Treatment on the Performance of CdS Quantum-Dot-Sensitized Solar Cells"
Jongmin Kim, Hongsik Choi, Changwoo Nahm, Chohui Kim, Seunghoon Nam, Suji Kang, Dae-Ryong Jung, Jae Ik Kim, Joonhyeon Kang, and Byungwoo Park*
J. Power Sources 220, 108 (2012).
"The Role of Carbon Incorporation in SnO2 Nanoparticles for Li Rechargeable Batteries"
Seunghoon Nam,+ Sungsoo Kim,+ Sungun Wi, Hongsik Choi, Sujin Byun, Soon-Mi Choi, Sang-Im Yoo, Kyu Tae Lee,* and Byungwoo Park*
J. Power Sources 211, 154 (2012).
"The Effect of TiCl4-Treated TiO2 Compact Layer on the Performance of Dye-Sensitized Solar Cell"
Hongsik Choi, Changwoo Nahm, Jongmin Kim, Joonhee Moon, Seunghoon Nam, Chohui Kim, Dae-Ryong Jung, and Byungwoo Park*
Curr. Appl. Phys. 12, 737 (2012).
"Challenges in Synthesizing Carbon-Coated LiFePO4 Nanoparticles from Hydrous FePO4 and Their Electrochemical Properties"
Seunghoon Nam, Sungun Wi, Changwoo Nahm, Hongsik Choi, and Byungwoo Park*
Mater. Res. Bull. 47, 3495 (2012).
"Photoluminescence Enhancement in CdS Quantum Dots by Thermal Annealing"
Jae Ik Kim,+ Jongmin Kim,+ Junhee Lee,+ Dae-Ryong Jung, Hoechang Kim, Hongsik Choi, Sungjun Lee, Sujin Byun, Suji Kang, and Byungwoo Park*
Nanoscale Res. Lett. 7, 482 (2012).
"Facile Synthesis of Porous-Carbon/LiFePO4 Nanocomposites"
Sungun Wi, Seunghoon Nam, Yuhong Oh, Jongmin Kim, Hongsik Choi, Saeromi Hong, Sujin Byun, Suji Kang, Dong Joo Choi, Key-one Ahn, Young-Ho Kim,* and Byungwoo Park*
J. Nanopart. Res. 14, 1327 (2012).
"Review Paper: Surface Plasmon Resonance for Photoluminescence and Solar-Cell Applications"
Jongmin Kim,+ Hongsik Choi,+ Changwoo Nahm,+ and Byungwoo Park*
Electron. Mater. Lett. 8, 351 (2012).
"The Effects of 100 nm-Diameter Au Nanoparticles on Dye-Sensitized Solar Cells"
Changwoo Nahm, Hongsik Choi, Jongmin Kim, Dae-Ryong Jung, Chohui Kim, Joonhee Moon, Byungjoo Lee, and Byungwoo Park*
Appl. Phys. Lett. 99, 253107 (2011).
[Virtual Journal of Nanoscale Science & Technology]
"Photoluminescence Enhancement in CdS Nanoparticles by Surface-Plasmon Resonance"
Dae-Ryong Jung, Jongmin Kim, Seunghoon Nam, Changwoo Nahm, Hongsik Choi, Jae Ik Kim, Junhee Lee, Chohui Kim, and Byungwoo Park*
Appl. Phys. Lett. 99, 41906 (2011).
"The Effect of a Blocking Layer on the Photovoltaic Performance in CdS Quantum-Dot-Sensitized Solar Cells"
Jongmin Kim, Hongsik Choi, Changwoo Nahm, Joonhee Moon, Chohui Kim, Seunghoon Nam, Dae-Ryong Jung, and Byungwoo Park*
J. Power Sources 196, 10526 (2011).
[Featured as a Key Scientific Article in Renewable Energy Global Innovations]
"Electrochemical Promotion of Oxygen Reduction on Gold with Aluminum-Phosphate Overlayer"
Yejun Park, Seunghoon Nam, Yuhong Oh, Hongsik Choi, Jungjin Park, and Byungwoo Park*
J. Phys. Chem. C 115, 7092 (2011).
"Review Paper: Semiconductor Nanoparticles with Surface Passivation and Surface Plasmon"
Dae-Ryong Jung,* Jongmin Kim, Changwoo Nahm, Hongsik Choi, Seunghoon Nam, and Byungwoo Park*
Electron. Mater. Lett. 7, 185 (2011).

Presentations (International)
"The Construction of Tandem Dye-Sensitized Solar Cells from Chemically-Derived Nanoporous Photoelectrodes"
Hongsik Choi, Sangheon Lee, Taehyun Hwang, Seunghoon Nam, Joonhyeon Kang, Byungho Lee, and Byungwoo Park
Materials Research Society (MRS) Spring Meeting. San Francisco, CA, April 2015.
"The Construction of Tandem Dye-Sensitized Solar Cells from Chemically-Derived Nanoporous Photoelectrodes"
Hongsik Choi, Taehyun Hwang, Sangheon Lee, Seunghoon Nam, Joonhyeon Kang, Byungho Lee, and Byungwoo Park
International Conference on Electronic Materials and Nanotechnology for Green Environment (ENGE2014). Jeju, Korea, November 16-19, 2014. [Poster by Hongsik Choi]
"Nanoporous NiO Thin Films Prepared by Selective Etching for the p-Type Dye-Sensitized Solar Cells"
Hongsik Choi, Changwoo Nahm, Seunghoon Nam, Byungho Lee, Taehyun Hwang, Sangheon Lee, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, December 2013. [Poster by Hongsik Choi]
"Porous Graphene as a Smart Strategy for Wrapping SnO2"
Seunghoon Nam, Sungun Wi, Yuhong Oh, Saeromi Hong, Hyungsub Woo, Jaewon Kim, Sangheon Lee, Taehyun Hwang, Hongsik Choi, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, December 2013.
"Quantitative Understanding of Damp-Heat-Induced Degradation in Transparent Conducting Oxides"
Jae Ik Kim, Woojin Lee, Taehyun Hwang, Seung-Yoon Lee, Suji Kang, Hongsik Choi, Saeromi Hong, Taeho Moon, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, December 2013.
"Nanoscale Interface Control for Photoluminescence and Solar-Cell Applications"
Byungwoo Park, Hongsik Choi, Jae Ik Kim, Seunghoon Nam, Woojin Lee, Sungun Wi, Chohui Kim, and Joonhyeon Kang,
The 9th Tsinghua University - University of Tokyo - Seoul National University Student Workshop. Seoul, Korea, October 9-12, 2013.
"The Role of Carbon Incorporation in SnO2 Nanoparticles for Li Rechargeable Batteries"
Seunghoon Nam, Sungsoo Kim, Sungun Wi, Hongsik Choi, Sujin Byun, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, November 2012.
"Simple ‘Deposition and Selective Etching’ Process for Nanoporous TiO2 Thin Film and Its Application to Dye-Sensitized Solar Cell"
Changwoo Nahm, Hongsik Choi, Jongmin Kim, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, November 2012. [Poster by Hongsik Choi]
"Improved Photovoltaic Performance of CdS Quantum-Dot-Sensitized Solar Cell through ZnO Coating"
Hongsik Choi, Jongmin Kim, Changwoo Nahm, Chohui Kim, Seunghoon Nam, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, November 2012. [Poster by Hongsik Choi]
"Mixture of Nanoporous Spheres and Nanoparticles for High-Efficiency ZnO-Based Dye-Sensitized Solar Cells"
Chohui Kim, Jongmin Kim, Hongsik Choi, Changwoo Nahm, Suji Kang, Sungjun Lee, Byungho Lee, and Byungwoo Park
Global Photovoltaic Conference 2012 (GPVC2012). Busan, Korea, November 19-21, 2012.
"Simple ‘Deposition and Selective Etching’ Process for Nanoporous TiO2 Thin Film and Its Application to Dye-Sensitized Solar Cells"
Changwoo Nahm, Hongsik Choi, Jongmin Kim, and Byungwoo Park
Global Photovoltaic Conference 2012 (GPVC2012). Busan, Korea, November 19-21, 2012.
"Simple ‘Deposition and Selective Etching’ Process for Nanoporous-TiO2 Thin Film and Its Application to Dye-Sensitized Solar Cell"
Changwoo Nahm, Hongsik Choi, Jongmin Kim, and Byungwoo Park
The 13th Korea - Japan Student Symposium (Seoul National University - Tohoku University). Seoul, Korea, November 7-9, 2012.
"The Role of Carbon Incorporation in SnO2 Nanoparticles for Li Rechargeable Batteries"
Seunghoon Nam, Sungsoo Kim, Sungun Wi, Hongsik Choi, Sujin Byun, and Byungwoo Park
The 13th Korea - Japan Student Symposium (Seoul National University - Tohoku University). Seoul, Korea, November 7-9, 2012.
"Improved Photovoltaic Performance of CdS Quantum-Dot-Sensitized Solar Cell through ZnO Coating"
Hongsik Choi, Jongmin Kim, Changwoo Nahm, Chohui Kim, Seunghoon Nam, Joonhyeon Kang, Byungho Lee, and Byungwoo Park
The 13th Korea - Japan Student Symposium (Seoul National University - Tohoku University). Seoul, Korea, November 7-9, 2012. [Poster by Hongsik Choi]
"The Effect of TiO2-Coating Layer on the Performance in Nanoporous ZnO-Based Dye-Sensitized Solar Cells"
Chohui Kim, Jongmin Kim, Hongsik Choi, Changwoo Nahm, Suji Kang, Sungjun Lee, Byungho Lee, and Byungwoo Park
The 13th Korea - Japan Student Symposium (Seoul National University - Tohoku University). Seoul, Korea, November 7-9, 2012.
"Post-Annealing Effects on the Structural and Optical Properties of Zn(S,O) Thin Films"
Sungjun Lee, Jongmin Kim, Hongsik Choi, Woojin Lee, Joonhyeon Kang, Suji Kang, and Byungwoo Park
The 13th Korea - Japan Student Symposium (Seoul National University - Tohoku University). Seoul, Korea, November 7-9, 2012.
"Semiconductor Nanoparticles with Surface Passivation and Surface Plasmon for Luminescence and Solar-Cell Applications"
Byungwoo Park, Jongmin Kim, Changwoo Nahm, Hongsik Choi, Seunghoon Nam, and Chohui Kim
International Conference on Electronic Materials and Nanotechnology for Green Environment (ENGE2012). Jeju, Korea, September 16-19, 2012.
"The Effect of TiO2-Coating Layer on the Performance in Nanoporous ZnO-Based Dye-Sensitized Solar Cells"
Chohui Kim, Jongmin Kim, Hongsik Choi, Changwoo Nahm, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, November 2011.
"Interface Control for Highly Efficient Dye- and Quantum-Dot- Sensitized Solar Cells"
Hongsik Choi, Changwoo Nahm, Jongmin Kim, Joonhee Moon, Seunghoon Nam, Chohui Kim, Dae-Ryong Jung, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, November 2011. [Poster by Hongsik Choi]
"The Effect of a Blocking Layer on the Photovoltaic Performance in CdS Quantum-Dot-Sensitized Solar Cells"
Jongmin Kim, Hongsik Choi, Changwoo Nahm, Joonhee Moon, Chohui Kim, Seunghoon Nam, Dae-Ryong Jung, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, November 2011.
"Photoluminescence Enhancement in CdS Nanoparticles by Surface-Plasmon Resonance"
Dae-Ryong Jung, Jongmin Kim, Seunghoon Nam, Changwoo Nahm, Hongsik Choi, Jae Ik Kim, Junhee Lee, Chohui Kim, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, November 2011.
"The Effects of 100 nm-Diameter Au Nanoparticles on Dye-Sensitized Solar Cells"
Changwoo Nahm, Hongsik Choi, Jongmin Kim, Dae-Ryong Jung, Chohui Kim, and Byungwoo Park
Materials Research Society (MRS) Fall Meeting. Boston, MA, November 2011.
"Electrochemical Promotion of Oxygen Reduction on Gold with Aluminum-Phosphate Overlayer"
Yejun Park, Seunghoon Nam, Yuhong Oh, Hongsik Choi, Jungjin Park, and Byungwoo Park
Electrochemical Society (ECS) Meeting. Boston, MA, October 2011.

Presentations (Domestic)
"The Effect of Surface Treatment on the Photovoltaic Performance in CdS Quantum-Dot-Sensitized Solar Cells"
Jongmin Kim, Hongsik Choi, Changwoo Nahm, Joonhee Moon, Chohui Kim, Seunghoon Nam, Dae-Ryong Jung, and Byungwoo Park
태양전지 연구회 워크숍 2012. Daejeon, Korea, February 28-29, 2012.
"The Effects of 100 nm-Diameter Au Nanoparticles on Dye-Sensitized Solar Cells"
Changwoo Nahm, Hongsik Choi, Jongmin Kim, Dae-Ryong Jung, Chohui Kim, and Byungwoo Park
태양전지 연구회 워크숍 2012. Daejeon, Korea, February 28-29, 2012.
"Interface Control for Highly Efficient Dye- and Quantum-Dot- Sensitized Solar Cells"
Hongsik Choi, Changwoo Nahm, Jongmin Kim, Joonhee Moon, Seunghoon Nam, Chohui Kim, Dae-Ryong Jung, and Byungwoo Park
태양전지 연구회 워크숍 2012. Daejeon, Korea, February 28-29, 2012.
"The Effect of TiO2-Coating Layer on the Performance in Nanoporous ZnO-Based Dye-Sensitized Solar Cells"
Chohui Kim, Jongmin Kim, Hongsik Choi, Changwoo Nahm, and Byungwoo Park
태양전지 연구회 워크숍 2012. Daejeon, Korea, February 28-29, 2012.