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Senior Scientist I


Advanced Characterisation and Instrumentation (ACI) Department

(+65) 6416 8958

2 Fusionopolis Way. Innovis, #08-03, Singapore 138634

Research Details

 Analytical System Integration & Machine Learning Methods

 Transient Optical & optoelectronic Spectroscopy techniques


 Charge Transport & Recombination studies in semiconductor materials & devices

     *  Time of Flight (TOF) Photoconductivity Measurement Technique, Photoinduced Charge Extraction
        by Linearly Increasing Voltage (PhotoCELIV) Technique, Dark Injection Space Charge Limited Current
        (DI-SCLC) Technique.

 Time Resolved Optical Spectroscopy

     *  Transient absorption/Photoluminescence, Polarisation sensitive optical spectroscopy meansurements

 Semiconductor Device Physiscs (LED, OPV, DSSC, Perovskite)


 Accelerated Materials Development for Manufacturing


 2018 - current       Senior Scientist I, IMRE

 2012 - 2017          Scientist III, IMRE

 2011 - 2012          Scientist II, IMRE

 2007 - 2011          Senior Research Engineer, IMRE

 2003 - 2006          Research Associate, IMRE

 2001 - 2002          Post-Doctoral Research Fellow, Finland


 Ph.D (Laser Technology), Anna University, Tamil Nadu, India, 2001

 M.Sc (Physics), Presidency College, (University of Madras), Tamil Nadu, India, 1995

 B.Sc (Physics), Women's Christian College, Nagercoil (M.S University), Tamil Nadu, India, 1993

 2008               Marquis Who's Who in Science & Engineering

 2006               Outstanding Contribution Partner Award from National Junior College, Singapore

 2005               Outstanding Contribution Partner Award from National Junior College, Singapore

 1999-2000       Senior Research Fellowship from DST, Government of India

 1997-1999       Junior Research Fellowship from DST, Government of India


 2016-2018     Adjunct Assoc. Professor @NUS, Mechanical Engineering

 2008-2015     Member, American Chemical Society

 I.  Popularization Resolved Photoluminescence studies /TMDC Materials
 1.  Vijila Chellappan, Ai Lin Christina Pang, Soumya Sarkar, Zi En Ooi, Kuan Eng Johnson Goh;
  'Effect of Phonon on Valley Depolarization in Monolayer WSe2', Electronic Materials Letters,
 (2018) 14:766-773.

 2.  Fabio Bussolotti, Hiroyo Kawai, Zi En Ooi, Vijila Chellappan, Dickson Thian, Ai Lin Christina Pang
 and Kuan Eng Johnson Goh, 'Roadmap on finding chiral valleys : screening 2D materials for valleytronics'
 Nano Futures, 2 (2018) 032001.

 II.  Optoelectronic Device characterisation (Perovskite, Organic photovoltaic, DSSC)
 3.  CY Jiang, V Chellappan, WP Goh, J Zhang, 'Investigating coating method induced vertical phase
 distribution in polymer-fullerene organic solar cells', Solar Energy Materials and Solar Cells, 179, 241,

 4.  Milos Petrovic, Tao Ye, Vijila Chellappan, and Seeram Ramakrishna, 'Effect of Low Temperature
 on Charge Transport in Operational Planar and Mesoporous Perovskite Solar Cells' ACS : Appl. Mater.
 Interfaces, 2017, 9, 42769-42778.

 5.  Milos Petrovic', Tao Ye, Chellappan Vijila, and Seeram Ramakrishna, 'Infulence of Charge Transport
 and Defects on the Performance of Planar and Mesostructured Perovskite Solar Cells' Adv. Energy Mater.
 7, 1602610, (2017).

 6.  Tao Ye, Shaoyang Ma, Xi Jiang, Lei Wei, Chellappan Vijila, and Seeram Ramakrishna 'Performance
 Enhancement of Tri-Cation and Dual-Anion Mixed Perovskite Solar Cells by Au@SiO2 Nanoparticles'
 Adv. Funct. Mater., 1606545, (2017).

 7.  Tao Ye, Shaoyang Ma, Xi Jiang, Milos Petrovic, Chellappan Vijila, Seeram Ramakrishna and Lei Wei,
 'Electrosprayed TiO2 nanoporous hemispheres for enhanced electron transport and device performance
 of formamidinium based perovskite solar cells' Nanoscale, 9, 412, (2017).

 8.  Tao Ye, Jun Xing, Milos Petrovic, Shi Chen, Vijila Chellappan, Sandhya Subramanian, Tze Chien Sum,
 Bin Liu, Qihua Xiong, Seeram Ramakrishna, 'Temperature effect of the compact TiO2 layer in planar
 perovskite solar cells : An interfacial electrical, optical and carrier mobility study', Solar Energy Materials
 & Solar Cells 163, 242-249, (2017).

 9.  Tao Ye, Milos Petrovic, Shengjie Peng, Jeremy Lee Kong Yoong, Chellappan Vijila, and Seeram
 Ramakrishna, 'Enhanced Charge Carrier Transport and Device Performance Through Dual-Cesium Doping
 in Mixed-Cation Perovskite Solar Cells with Near Unity Free Carrier Ratio' ACS Appl. Mater. Interfaces,
 9, 2358-2368, (2017).

 10.  Goutam Kumar Dalapati, Siarhei Zhuk, Saeid Masudy-Panah, Ajay Kushwahs, Hwee Leng Seng,
 Vijila Chellappan, Vignesh Suresh, Zhenghua Su, Sudip Kumar Batabyal, Cheng Cheh Tan, Asim Guchhait,
 Lydia Helena Wong, Terence Kin Shun Wong & Sudhiranjan Tripathy, 'Impact of molybdenum out diffusion
 and interface quality on the performance of sputter grown CZTS based solar cells' Scientific Reports,
 DOI:10.1038/s41598-017-01605-7,  (2017).

 11.  Ryuzi Katoh, Gomathy Sandhya Subramanian, Sergey Gorelik, Chellappan Vijila, Evan Laurence
 Williams, Hiroyuki Matsuzaki, Akihiro Furube, Prashant Sonar, Jonathan Hobley, 'Charge Generation
 and Recombination in Diketopyrrolopyrrole Polymer : Fullerene Bulk Heterojunctions Studied by Transient
 Absorption and Time-Resolved Microwave Conductivity', The Journal of Physical Chemistry, Part C,
 DOI : 10.1021/acs.jpcc.6b08379, (2017).

 12.  Milos Petrovic, Vijila Chellappan, Goutam Kumar Dalapati, Seeram Ramakrishna, 'Photocharge
 generation and transport studies on BFO/poly (3-hexylthiophene) heterojunction' Materials Letters, 163,
 118 (2016).

 13.  Rajour Tanyi Akoa, D.S.U. Peirisa, Piyasiri Ekanayakea, Ai Ling Tana, David James Youngc,
 Zhang Zheng, Vijila Chellappan, 'DSSCs with ZnO@TiO2 core-shell photoanodes showing improved Voc :
 Modification of energy gradients and potential barriers with Cd and Mg ion dopants', Solar Energy Materials
 and Solar Cells, 157, 18-27 (2016).

 14.  Xianqiang Li, Xiaohong Tang, Fei Wang, Vijila Chellappan, Tjiu Weng Weei, Shifeng Guo, Hong Wang,
 Dan Wu, Jun Li, 'Investigations of a New High Performance Low Band Gap Photovoltaic Polymer
 Semiconductor', IEEE Journal of Photovoltaics 6 (3), 696-704 (2016).

 15.  Yu Yong, Tan Yen Nee, Chellappan Vijila, Geng Junlong, Edward Ong, 'Bovine Serum Albulmin
 Protein-Templated Silver Nanocluster (BSA-Ag 13) : An Effective Singlet Oxygen Generator
 for Photodynamic Cancer Therapy, Advanced Healthcare Materials, DOI: 10.1002/adhm.201600312, (2016).

 16.  Milos Petrovic, Vijila Chellappan, Seeram Ramakrishna, 'Perovskites : Solar cells & engineering
 applications-materials and device developments', Solar Engergy, 122, 678 (2015).

 17.  Milos Petrovic, Vijila Chellappan, Tao Ye, Seeram Ramakrishna, /Charge carrier decay and diffusion
 in organic-inorganic CH3NH3PbI3-xClx perovskite based solar cell, Physica status solidi (RRL)-Rapid
 Research Letters, 9, 12, 682 (2015).

 18.  Mein Jin Tan, Wei Chen, and Vijila Chellappan, 'Aqueous Metal Oxide Inks for Modifying Electrode
 Work Function in Polymer Solar Cells' Adv. Mater. Interfaces, 1500438 (2015).

 19.  Naveen Kumar Elumalai, Chellappan Vijila, Rajan Jose, Ashraf Uddin, Seeram Ramakrishna
 'Metal oxide semiconducting interfacial layers for photovoltaic and photocatalytic applications', Mater
 Renew. Sustain, Energy 4:11, (2015).




Last updated on : 26 Apr 2019 02:34 PM