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1

Preparation and characterization of nano-scale ZnO as a buffer layer for inkjet printing of silver cathode in polymer solar cells

Seung Hun Eom, S. Senthilarasu, Periyayya Uthirakumar, Chang-Hee Hong, Youn-Sik Lee, Jongsun Lim, Sung Cheol Yoon, Changjin Lee, Soo-Hyoung Lee

Journal:

Solar Energy Materials and Solar Cells

Year:

2008

Language:

english

File:

PDF, 1.67 MB

english, 2008

2

The different types of ZnO materials on the performance of dye-sensitized solar cells

Periyayya Uthirakumar, Ji Hye Kang, S. Senthilarasu, Chang-Hee Hong

Journal:

Physica E: Low-dimensional Systems and Nanostructures

Year:

2011

Language:

english

File:

PDF, 998 KB

english, 2011

3

Synthesis and characterization of polyesters containing fluorescein dye units

Periyayya Uthirakumar, Eun-Kyung Suh, Chang-Hee Hong, Youn-Sik Lee

Journal:

Year:

2005

Language:

english

File:

PDF, 204 KB

english, 2005

4

Enhancement of light output power in GaN-based light-emitting diodes using indium tin oxide films with nanoporous structures

Ji Hye Kang, Jae Hyoung Ryu, Hyun Kyu Kim, Hee Yun Kim, Nam Han, Mi So Lee, Young Jae Park, Periyayya Uthirakumar, Volodymyr V. Lysak, Chang-Hee Hong

Journal:

Thin Solid Films

Year:

2011

Language:

english

File:

PDF, 937 KB

english, 2011

5

Facile synthesis of ZnO nanoglobules and its photocatalytic activity in the degradation of methyl orange dye under UV irradiation

Khan, Rizwan, Shamshi Hassan, M., Uthirakumar, Periyayya, Yun, Jin Hyeon, Khil, Myung-Seob, Lee, In-Hwan

Journal:

Materials Letters

Year:

2015

Language:

english

File:

PDF, 787 KB

english, 2015

6

Surfactant-free synthesis of leaf-like hierarchical CuO nanosheets as a UV light filter

Uthirakumar, Periyayya, Muthulingam, S., Khan, Rizwan, Hyeon Yun, Jin, Cho, Han-Su, Lee, In-Hwan

Journal:

Materials Letters

Year:

2015

Language:

english

File:

PDF, 1.54 MB

english, 2015

7

Role of carbon quantum dots and film thickness on enhanced UV shielding capability of flexible polymer film containing carbon quantum dots/N-doped ZnO nanoparticles

Uthirakumar, Periyayya, Devendiran, M., Yun, Jin-Hyeon, Kim, Gyu Cheol, Kalaiarasan, S., Lee, In-Hwan

Journal:

Optical Materials

Year:

2018

Language:

english

File:

PDF, 3.06 MB

english, 2018

8

Efficient, recyclable, and affordable daylight induced Cu/Cu2O/CuI photocatalyst via an inexpensive iodine sublimation process

Uthirakumar, Periyayya, Devendiran, M., Yu. Kuznetsov, Andrej, Cheol Kim, Gyu, Lee, In-Hwan

Journal:

Applied Surface Science

Year:

2020

File:

PDF, 724 KB

2020

9

Preparation and photophysical properties of organic fluorescent polymers and their nanoparticles

Periyayya Uthirakumar, Chang-Hee Hong, Eun-Kyung Suh, Youn-Sik Lee

Journal:

Journal of Applied Polymer Science

Year:

2006

Language:

english

File:

PDF, 212 KB

english, 2006

10

Preparation and characterization of exfoliated polystyrene/clay nanocomposites using a cationic radical initiator-MMT hybrid

Periyayya Uthirakumar, Min-Ki Song, Changwoon Nah, Youn-Sik Lee

Journal:

European Polymer Journal

Year:

2005

Language:

english

File:

PDF, 385 KB

english, 2005

11

Nanoscale ITO/ZnO layer-texturing for high-efficiency InGaN/GaN light emitting diodes

Periyayya Uthirakumar, Ji Hye Kang, Beo Deul Ryu, Hyung Gu Kim, Hyun Kyu Kim, Chang-Hee Hong

Journal:

Materials Science and Engineering: B

Year:

2010

Language:

english

File:

PDF, 892 KB

english, 2010

12

Polymer solar cells based on inkjet-printed PEDOT:PSS layer

Seung Hun Eom, S. Senthilarasu, Periyayya Uthirakumar, Sung Cheol Yoon, Jongsun Lim, Changjin Lee, Hyun Seok Lim, J. Lee, Soo-Hyoung Lee

Journal:

Organic Electronics

Year:

2009

Language:

english

File:

PDF, 667 KB

english, 2009

13

Synthesis and optical properties of sword-like GaN nanorods clusters

Periyayya Uthirakumar, Nam Han, Seung Hee Woo, Eun-Kyung Suh, Chang-Hee Hong

Journal:

Current Applied Physics

Year:

2009

Language:

english

File:

PDF, 304 KB

english, 2009

14

Zinc oxide nanostructures derived from a simple solution method for solar cells and LEDs

Periyayya Uthirakumar, Hyung Gu Kim, Chang-Hee Hong

Journal:

Chemical Engineering Journal

Year:

2009

Language:

english

File:

PDF, 1.14 MB

english, 2009

15

Preparation and characterization of new difunctional cationic radical initiator-montmorillonite hybrids

Periyayya Uthirakumar, Cheol-Ju Kim, Kee Suk Nahm, Yoon Bong Hahn, Youn-Sik Lee

Journal:

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Year:

2004

Language:

english

File:

PDF, 208 KB

english, 2004

16

Preparation of polystyrene/montmorillonite nanocomposites using a new radical initiator-montmorillonite hybrid via in situ intercalative polymerization

Periyayya Uthirakumar, Kee Suk Nahm, Yoon Bong Hahn, Youn-Sik Lee

Journal:

European Polymer Journal

Year:

2004

Language:

english

File:

PDF, 507 KB

english, 2004

17

Exfoliated high-impact polystyrene/MMT nanocomposites prepared using anchored cationic radical initiator–MMT hybrid

Periyayya Uthirakumar, Yoon Bong Hahn, Kee Suk Nahm, Youn-Sik Lee

Journal:

European Polymer Journal

Year:

2005

Language:

english

File:

PDF, 282 KB

english, 2005

18

Nanocrystalline ZnO particles: Low-temperature solution approach from a single molecular precursor

Periyayya Uthirakumar, B. Karunagaran, S. Nagarajan, Eun-Kyung Suh, Chang-Hee Hong

Journal:

Journal of Crystal Growth

Year:

2007

Language:

english

File:

PDF, 837 KB

english, 2007

19

Hybrid fluorescent polymer–zinc oxide nanoparticles: Improved efficiency for luminescence conversion LED

Periyayya Uthirakumar, Youn-Sik Lee, Eun-Kyung Suh, Chang-Hee Hong

Journal:

Journal of Luminescence

Year:

2008

Language:

english

File:

PDF, 812 KB

english, 2008

20

Growth, morphology and optical properties of tris(8-hydroxyquinoline)aluminum/zinc oxide hybrid nanowires

Periyayya Uthirakumar, Eun-Kyung Suh, Chang-Hee Hong

Journal:

Journal of Luminescence

Year:

2008

Language:

english

File:

PDF, 1.20 MB

english, 2008

21

ZnO nanoballs synthesized from a single molecular precursor via non-hydrolytic solution route without assistance of base, surfactant, and template etc

Periyayya Uthirakumar, Youn-Sik Lee, Eun-Kyung Suh, Chang-Hee Hong

Journal:

Physics Letters A

Year:

2006

Language:

english

File:

PDF, 225 KB

english, 2006

22

Enhanced light output power of GaN-based light emitting diodes with overcut sideholes formed by wet etching

Hyun Kyu Kim, Hyung Gu Kim, Hee Yun Kim, Jae Hyoung Ryu, Ji hye Kang, Nam Han, Periyayya Uthirakumar, Chang-Hee Hong

Journal:

Solid-State Electronics

Year:

2010

Language:

english

File:

PDF, 479 KB

english, 2010

23

Impact of layer thickness and light transmission of ZnO nanomaterials on GaN-based light emitting diodes

Periyayya Uthirakumar, Beo Deul Ryu, Ji Hye Kang, Hyung Gu Kim, Jae Hyoung Ryu, Chang-Hee Hong

Journal:

Year:

2010

Language:

english

File:

PDF, 1015 KB

english, 2010

24

Preparation of exfoliated high-impact polystyrene/MMT nanocomposites via in situ polymerization under controlling viscosity of the reaction medium

Periyayya Uthirakumar, Hee Joo Kim, Chang-Hee Hong, Eun-Kyung Suh, Youn-Sik Lee

Journal:

Polymer Composites

Year:

2008

Language:

english

File:

PDF, 354 KB

english, 2008

25

Yellow light-emitting polymer bearing fluorescein dye units: Photophysical property and application as luminescence converter of a hybrid LED

Periyayya Uthirakumar, Chang-Hee Hong, Eun-Kyung Suh, Youn-Sik Lee

Journal:

Reactive and Functional Polymers

Year:

2007

Language:

english

File:

PDF, 375 KB

english, 2007

26

Fabrication and electro chemical properties of poly vinyl alcohol/para toluene sulfonic acid membranes for the applications of DMFC

G. Gnana Kumar, Periyayya Uthirakumar, Kee Suk Nahm, R. Nimma Elizabeth

Journal:

Solid State Ionics

Year:

2009

Language:

english

File:

PDF, 548 KB

english, 2009

27

Effect of zinc oxide incorporation on the morphology of tris(8-hydroxyquinoline)aluminum/zinc oxide hybrid nanomaterials

Periyayya Uthirakumar, Eun-Kyung Suh, Chang-Hee Hong

Journal:

Thin Solid Films

Year:

2008

Language:

english

File:

PDF, 1.44 MB

english, 2008

28

Enhanced light output power of GaN-based light-emitting diodes by nano-rough indium tin oxide film using ZnO nanoparticles

Deul Ryu, Beo, Uthirakumar, Periyayya, Hye Kang, Ji, Jun Kwon, Bong, Chandramohan, S., Kyu Kim, Hyun, Yun Kim, Hee, Hyoung Ryu, Jae, Gu Kim, Hyung, Hong, Chang-Hee

Journal:

Journal of Applied Physics

Year:

2011

Language:

english

File:

PDF, 1.70 MB

english, 2011

29

TiO2 thin film gas sensor for monitoring ammonia

B. Karunagaran, Periyayya Uthirakumar, S.J. Chung, S. Velumani, E.-K. Suh

Journal:

Materials Characterization

Year:

2007

Language:

english

File:

PDF, 230 KB

english, 2007

30

Effect of annealing temperature and pH on morphology and optical property of highly dispersible ZnO nanoparticles

Periyayya Uthirakumar, Chang-Hee Hong

Journal:

Materials Characterization

Year:

2009

Language:

english

File:

PDF, 1.28 MB

english, 2009

31

Improved light extraction efficiency of GaN-based light emitting diodes using one and two interfaces of ITO/ZnO layer texturing

Periyayya Uthirakumar, Ji Hye Kang, Beo Deul Ryu, Chang-Hee Hong

Journal:

Materials Science in Semiconductor Processing

Year:

2010

Language:

english

File:

PDF, 672 KB

english, 2010

32

Synthesis and improved luminescence properties of OLED/ZnO hybrid materials

Uthirakumar Periyayya, Ji Hye Kang, Jae Hyoung Ryu, Chang-Hee Hong

Journal:

Year:

2011

Language:

english

File:

PDF, 1.58 MB

english, 2011

33

Comparison of various surface textured layer in InGaN LEDs for high light extraction efficiency

Kang, Ji Hye, Ryu, Jae Hyoung, Kim, Hyun Kyu, Kim, Hee Yun, Han, Nam, Park, Young Jae, Uthirakumar, Periyayya, Hong, Chang-Hee

Journal:

Year:

2011

Language:

english

File:

PDF, 1.39 MB

english, 2011

34

Enhanced air-cavity effect of periodically oriented embedded air protrusions for high-efficiency InGaN/GaN light-emitting diodes

Kim, Hyung Gu, Kim, Hyun Kyu, Kim, Hee Yun, Jeong, Hyun, Chandramohan, S., Uthirakumar, Periyayya, Jeong, Mun Seok, Lee, Jeong-Sik, Suh, Eun-Kyung, Hong, Chang-Hee

Journal:

Year:

2010

Language:

english

File:

PDF, 392 KB

english, 2010

35

Enhancement of Light Output Power in InGaN/GaN LEDs with Nanoroughed Hemispherical Indium Tin Oxide Transparent Ohmic Contacts

Kang, Ji Hye, Kim, Hyung Gu, Ryu, Jae Hyoung, Kim, Hyun Kyu, Kim, Hee Yun, Joo, Jin, Lee, Mi So, Park, Young Jae, Uthirakumar, Periyayya, Hong, Chang-Hee

Journal:

Electrochemical and Solid-State Letters

Year:

2010

Language:

english

File:

PDF, 457 KB

english, 2010

36

Novel Fluorescent Polymer/Zinc Oxide Hybrid Particles: Synthesis and Application as a Luminescence Converter for White Light-Emitting Diodes

Uthirakumar, Periyayya, Hong, Chang-Hee, Suh, Eun-Kyung, Lee, Youn-Sik

Journal:

Chemistry of Materials

Year:

2006

Language:

english

File:

PDF, 147 KB

english, 2006

37

Impact of two-floor air prism arrays as an embedded reflector for enhancing the output power of InGaN/GaN light emitting diodes

Kim, Hyung Gu, Kim, Hyun Kyu, Kim, Hee Yun, Ryu, Jae Hyoung, Kang, Ji Hye, Han, Nam, Uthirakumar, Periyayya, Hong, Chang-Hee

Journal:

Applied Physics Letters

Year:

2009

Language:

english

File:

PDF, 550 KB

english, 2009

38

Beam Divergence and Thermal Transient Characteristics of InGaN/GaN Light Emitting Diodes with Rear Side Grown ZnO Nanorods

Jin, Joo, Ryu, Beo Deul, Han, Min, Kumar, R. Saravana, Uthirakumar, Periyayya, Kim, Hyun Kyu, Han, Yang Jong, Lee, Kyu Han, Hong, Chang-Hee

Journal:

Japanese Journal of Applied Physics

Year:

2012

Language:

english

File:

PDF, 722 KB

english, 2012

39

Effect of Ridge Growth on Wafer Bowing and Light Extraction Efficiency of Vertical GaN-Based Light-Emitting Diodes

Ryu, Jae Hyoung, Chandramohan, S., Kim, Hyung Gu, Kim, Hee Yun, Kim, Hyun Kyu, Han, Nam, Kang, Ji Hye, Uthirakumar, Periyayya, Suh, Eun Kyung, Hong, Chang-Hee, Cho, Hyun Kyong, Song, Hyun Don, Kwon, H

Journal:

Japanese Journal of Applied Physics

Year:

2010

Language:

english

File:

PDF, 335 KB

english, 2010

40

Enhancement of Light Output Power and Modification of Beam Profile in InGaN/GaN Light Emitting Diodes with Micro Polygon Column Shaped Transparent

Lee, Mi So, Kim, Hyung Gu, Kang, Ji Hye, Ryu, Jae Hyoung, Kim, Hyun Kyu, Kim, Hee Yun, Uthirakumar, Periyayya, Hong, Chang-Hee

Journal:

Japanese Journal of Applied Physics

Year:

2010

Language:

english

File:

PDF, 530 KB

english, 2010

41

Light Output Power Enhancement of GaN-Based Light Emitting Diodes with Periodic Deflector Embedded on the Wet Etch Patterned Sapphire Substrate

Kim, Hyun Kyu, Kim, Hyung Gu, Kim, Hee Yun, Ryu, Jae Hyoung, Kang, Ji hye, Han, Nam, Kwon, Bong Jun, Uthirakumar, Periyayya, Han, Myung Soo, Kang, Sin Ho, Hong, Chang-Hee

Journal:

Japanese Journal of Applied Physics

Year:

2011

Language:

english

File:

PDF, 652 KB

english, 2011

42

Improvement of Light Output Power in InGaN/GaN Light-Emitting Diodes with a Nanotextured GaN Surface Using Indium Tin Oxide Nanospheres

Kang, Ji Hye, Kim, Hyung Gu, Kim, Hyun Kyu, Kim, Hee Yun, Ryu, Jae Hyoung, Uthirakumar, Periyayya, Han, Nam, Hong, Chang-Hee

Journal:

Japanese Journal of Applied Physics

Year:

2009

Language:

english

File:

PDF, 438 KB

english, 2009

43

Improved daylight-induced photocatalytic performance and suppressed photocorrosion of N-doped ZnO decorated with carbon quantum dots

Muthulingam, S., Bae, Kang Bin, Khan, Rizwan, Lee, In-Hwan, Uthirakumar, Periyayya

Journal:

Year:

2015

Language:

english

File:

PDF, 1004 KB

english, 2015

44

Enhanced Light Output Power of InGaN/GaN Light Emitting Diodes with Embedded Air Prisms

Kim, Hyung Gu, Kim, Hee Yun, Kim, Hyun Kyu, Ryu, Jae Hyoung, Kang, Ji Hye, Han, Nam, Uthirakumar, Periyayya, Hong, Chang-Hee

Journal:

Electrochemical and Solid-State Letters

Year:

2010

Language:

english

File:

PDF, 449 KB

english, 2010

45

Carbon quantum dots decorated N-doped ZnO: Synthesis and enhanced photocatalytic activity on UV, visible and daylight sources with suppressed photocorrosion

Muthulingam, S., Bae, Kang Bin, Khan, Rizwan, Lee, In-Hwan, Uthirakumar, Periyayya

Journal:

Journal of Environmental Chemical Engineering

Year:

2015

Language:

english

File:

PDF, 3.72 MB

english, 2015

46

InGaN/GaN Light-Emitting Diodes with Overcut-Shaped Periodic Microstructures Formed by Wet Etching Process

Kim, Hyung Gu, Kim, Hyun Kyu, Kim, Hee Yun, Ryu, Jae Hyoung, Kang, Ji hye, Han, Nam, Uthirakumar, Periyayya, Yu, Dong Hyun, Hong, Chang-Hee

Journal:

Electrochemical and Solid-State Letters

Year:

2009

Language:

english

File:

PDF, 312 KB

english, 2009

47

Highly efficient degradation of dyes by carbon quantum dots/N-doped zinc oxide (CQD/N-ZnO) photocatalyst and its compatibility on three different commercial dyes under daylight

Muthulingam, S., Lee, In-Hwan, Uthirakumar, Periyayya

Journal:

Journal of Colloid and Interface Science

Year:

2015

Language:

english

File:

PDF, 2.53 MB

english, 2015

48

Carbon quantum dots decorated leaf-like CuO nanosheets and their improved dispersion for an excellent UV-shielding property in polymer film

Periyayya, Uthirakumar, S, Muthulingam, Khan, Rizwan, Dao, Van-Dung, Tran, Van-Huong, Lee, In-Hwan

Journal:

Year:

2015

Language:

english

File:

PDF, 1.86 MB

english, 2015

49

Natural Light Source Assisted Synthesis of Self-decorated Ag/TiO2 Nanoparticles for Enhanced Photocatalytic Degradation of Fluorescein Dye

Uthirakumar, Periyayya, Deul Ryu, Beo, Hye Kang, Ji, So Lee, Mi, Hong, Chang-Hee

Journal:

Current Nanoscience

Year:

2012

Language:

english

File:

PDF, 906 KB

english, 2012

50

The Impact of ZnO Nanoparticle Interlayer on the Growth and Morphology of Broom-Like Single Crystalline Gallium Nitride

Uthirakumar, Periyayya, Suh, Eun-Kyung, Hong, Chang-Hee

Journal:

Journal of Nanoscience and Nanotechnology

Year:

2008

Language:

english

File:

PDF, 217 KB

english, 2008