Post Doctor


Hwa Sook Ryu

Office: Room #625, Asan Science Bldg.

Tel: 82-2-3290-3828

❂ Research

​Design and synthesis of organic conjugated molecules for organic electronic applications such as Organic Photovoltaic Cells (OPVCs),  Organic Light Emitting Diodes (OLEDs) and Organic Field-Effect Transistors (OFETs).

❂ Publications​ 

  1. Synergistic effect of the selenophene-containing central core and the regioisomeric monochlorinated terminals on the molecular packing, crystallinity, film morphology, and photovoltaic performance of selenophene-based nonfullerene acceptors
    G.Y. Ge, W. Xiong, K. K Liu, 
    H. S. Ryu,  S. S. Wan, B. Liu, A. Mahmood, H. R. Bai,  J.F. Wang, Z. Wang, H. Y. Woo, Y. Sun* and J.-L. Wang*
    J. Mater. Chem. C, press

  2. Solution‐Processed Organic Solar Cells with High Open‐Circuit Voltage of 1.3 V and Low Non‐Radiative Voltage Loss of 0.16 V
    N. An, Y. Cai, H. Wu, A. Tang, K. Zhang, X. Hao, Z. Ma,* Q. Guo,
    H. S. Ryu, H. Y. Woo, Y. Sun,* and E. Zhou*
    Adv. Mater. 2020, 32 (39).

  3. Fluorination Position: A Study of the Optoelectronic Properties of Two Regioisomers Using Spectroscopic and Computational Techniques
    J. J. Sutton, Y. Li,
    H. S. Ryu, E. J. Tay, H. Y. Woo, and K. C. Gordon*
    J. Phys. Chem. A 2020, 124 (38), 7685-7691.

  4. Effects of monohalogenated terminal units of non-fullerene acceptors on molecular aggregation and photovoltaic performance
    M. Zhang, M. Zeng, L. Ye, S. Tan, B. Zhao,
    H. S. Ryu, H. Y. Woo*, Y. Sun*
    Sol. Energy 2020, 208, 866-872.

  5. Terminal alkyl substitution in the A-D-A-type nonfullerene acceptor: Simultaneous improvements in the open-circuit voltage and short-circuit current for efficient indoor power generation
    H. S. Ryu, H. G. Lee, S.-C. Shin, J. Park, S. H. Kim, E. J. Kim, T. J. Shin, J. W. Shim*, B. J. Kim,* H. Y. Woo*
    J. Mater. Chem. A, 2020, 8, 23894 – 23905.

  6. Simultaneously improving the photovoltaic parameters of organic solar cells via isomerization of benzo[b]benzo[4,5]thieno[2,3-d]thiophene-based octacyclic non-fullerene acceptors
    Z. Zhou, J. Duan, L. Ye, G. Wang, B. Zhao, S. Tan*, P. Shen*, H. S. Ryu, H. Y. Woo*, Y. Sun*
    J. Mater. Chem. A, 2020, 8, 9684-969.

  7. Aesthetic and Colorful: Dichroic Polymer Solar Cells Using High-Performance Fabry-Pérot Etalon Electrodes with a Unique Sb2O3 Cavity
    H. R. Yeom, S. Song, S. Y. Park, H. S. Ryu, J. W. Kim, J. Heo, H. W. Cho, B. Walker, S.-J. Ko, H. Y. Woo*, J. Y. Kim*
    Nano Energy 2020, 77, 105146. 

  8. Organic Solar Cells Based on Chlorine Functionalized Benzo[1,2-b:4,5-b’]difuran-Benzo[1,2-c:4,5-c’]dithiophene-4,8-dione Copolymer with Efficiency Exceeding 13%
    L. Ye, X. Li, Y. Cai, H. S. Ryu, G. Lu, D. Wei, X. Sun*, H. Y. Woo, S. Tan, Y. Sun*
    Sci. China Chem. 2020, 63(4), 483-489.

  9. Effect of Extended π-Conjugation of Central Cores on Photovoltaic Properties of Asymmetric Wide-Bandgap Nonfullerene Acceptors
    T. Xia, C. Li, H. S. Ryu, X. Sun, H. Y. Woo*, Y. Sun*
    Org. Mater. 2020, 2, 173-181.

  10. Asymmetrically Alkyl‐Substituted Wide‐Bandgap Nonfullerene Acceptor for Organic Solar Cells
    T. Xia, C. Li, H. S. Ryu, X. Sun*, H. Y. Woo, Y. Sun*
    Sol. RRL, 2020, 4(5), 2000061

  11. Efficient Fused Ring Extension of A-D-A-type Nonfullerene Acceptors via Symmetric Replicating Core Unit Strategy
    T. Xia, C. Li,H. S. Ryu, J. Guo, J. Min, H. Y. Woo, Y. Sun*
    Chem. A Eur. J. 2020, 5(5), 1628-1635.

  12. Recent progress in indoor organic photovoltaics
    H. S. Ryu, S. Y. Park, T. H. Lee, J. Y. Kim*, H. Y. Woo*
    Nanoscale, 2020, 2, 5792 – 5804.

  13. Heteroatom Substitution-Induced Asymmetric A-D-A Type Non-Fullerene Acceptor for Efficient Organic Solar Cell
    C. Li, J. Song, Y. Cai, G. Han, W. Zheng, Y. Yi, H. S. Ryu, H. Y. Woo, Y. Sun*
    J. Energy Mater. 2020, 40, 144-150.

  14. Green-, Red-, and NIR-Emitting Polymer Dot Probes for Simultaneous Multicolor Cell Imaging with a Single Excitation Wavelength
    J.-E. Jeong, M. A. Uddin, H. S. Ryu, H.-C. Kim, M. Kang, J. F. Joung, S. Park, S.-H. Shim,* and H. Y. Woo*
    Chem. Mater. 2020, 32, 15, 6685–6696.

  15. Fuller-Rylenes: Paving the Way for Promising Acceptors
    J. Feng, H. Fu, W. Jiang*, A. Zhang, H. S. Ryu, H. Y. Woo, Y. Sun, and Z. Wang*
    ACS Appl. Mater. Interfaces  2020, 12(26), 29513-29519.

  16. Non‐Fullerene Organic Solar Cells Based on Benzo[1,2‐b:4,5‐b′]difuran‐Conjugated Polymer with 14% Efficiency
    X. Li, K. Weng, H. S. Ryu, J. Guo, X. Zhang, T. Xia, H. Fu, D. Wei, J. Min, Y. Zhang, H. Y. Woo*, Y. Sun*
    Adv. Funct. Mater.  2020, 30(6), 1906809.

  17. Insertion of chlorine atoms onto π-bridges of conjugated polymer enables improved photovoltaic performance
    L. Ye, Y. Xie, K. Weng, H. S. Ryu C. Li, Y. Cai, H. Fu, D. Wei, H. Y. Woo, S. Tan*, Y. Sun*
    Nano Energy . 2019, 58, 220-226.

  18. Ternary Organic Solar Cells Based on Two Compatible PDI-based Acceptors with Enhanced Power Conversion Efficiency
    K. Weng, C. Li, P. Bi, H. S. Ryu, Y. Guo, X. Hao, D. Zhao, W. Li*, H. Y. Woo, Y. Sun*
    J. Mater. Chem. A 2019, 7, 3552-3557.

  19. Organic solar cells for indoor power generation
    H. S. Ryu, H. Y. Woo*
    Sci. China Chem. 2019, 63 (1), 1-2.

  20. Synthesis, Molecular Packing, and Electrical Properties of New Regioisomeric n-Type Semiconducting Molecules with Modification of Alkyl Substituents Position
    H. S. Ryu, M. J. Kim, Y. W. Lee, S.-H. Lee, T. J. Shin*, J. H. Cho*, H. Y. Woo*
    ACS Appl. Mater. Interfaces 2019, 11, 50, 47170-47181.

  21. High-Performance Photomultiplication Photodiode with a 70-nm-Thick Active Layer Assisted by IDIC as an Efficient Molecular Sensitizer
    D. K. Neethipathi, H. S. Ryu, M. S. Jang, S. Yoon, K. M. Sim, H. Y. Woo*, D. S. Chung*
    ACS Appl. Mater. Interfaces 2019, 11, 21211-21217.

  22. Fluorobenzotriazole (FTAZ)‐Based Polymer Donor Enables Organic Solar Cells Exceeding 12% Efficiency
    Z. Liao, Y. Xie, L. Chen,Y. Tan, S. Huang, Y. An,H. S. Ryu, X. Meng, X. Liao, B. Huang, Q. Xie, H. Y. Woo, Y. Sun*, Y. Chen*Adv. Funct. Mater. 2019, 29, 1808828.

  23. High-Performance Near-Infrared-Selective Thin Film Organic Photodiode Based on Molecular Approach Targeted to Ideal Semiconductor Junction​
    S. Yoon, H. S. Ryu, J. U. Ha, M. Kang, T. L. Nguyen, H. Y. Woo*, D. S. Chung*
    J. Phys. Chem. Lett. 2019, 10(18), 5647-5653.

  24. Asymmetric A–D–π–A-type nonfullerene small molecule acceptors for efficient organic solar cells​
    X. Li, C. Li, L. Ye, K. Weng, H. Fu, H. S. Ryu, D. Wei, X. Sun,* H. Y. Woo, Y. Sun*
    J. Mater. Chem. A 2019,7, 19348-19354.

  25. Asymmetric Selenophene-Based Non-Fullerene Acceptors for High-Performance Organic Solar Cells
    C. Li, T. Xia, J. Song, H. Fu, H. S. Ryu, K. Weng, L. Ye, H. Y. Woo*, Y. Sun*
    J. Mater. Chem. A. 2019, 7, 1435-1441. 

  26. Ternary Organic Solar Cells with Small Nonradiative Recombination Loss
    Y. Xie, T. Li, J. Guo, P. Bi, X. Xue, H. S. Ryu, Y. Cai, J. Min, L. Huo, X. Hao, H. Y. Woo*, X. Zhan, Y. Sun*
    ACS Energy Lett. 2019, 4(5), 1196-1203.

  27. Dicyanodistyrylbenzene-based copolymers for ambipolar organic field-effect transistors with well-balanced hole and electron mobilities
    H. S. Ryu, M. J. Kim, M. S. Kang, J. H. Cho*, H. Y. Woo*
    Macromolecules 2018, 51 (20), 8258-8267.

  28. Synthesis and photovoltaic properties of three different types of terpolymers
    M. A. Uddin, N. G. An, Y. Li, S. Song, H. S. Ryu, J. Y. Kim*, H. Y. Woo*
    Materials Chemistry Frontiers. 2017, 1, 1147-1155.