Publications

Journal Publications

Performance evaluation and optimization of CH₃NH₃PbBr₃ based planar perovskite solar cells using various hole-transport layers
R. Jeyakumar and Atanu Bag
Solar Energy, 236, pp.832-840.

Methylammonium lead bromide based planar perovskite solar cells using various electron transport layers
R. Jeyakumar, Atanu Bag
Solar Energy, 221, pp. 456–467.

Organic tandem solar cells with 18.6% efficiency
Muath Bani Salim, Reza Nekovei and R. Jeyakumar
Solar Energy, 198, pp. 160-166.

Influence of electron transport layer (TiO₂) thickness and its doping density on the performance of CH₃NH₃PbI₃ based planar perovskite solar cells
R. Jeyakumar, Atanu Bag, Reza Nekovei, R. Radhakrishnan
J. Electronic Materials, 49, pp.3533–3539.

Effect of absorber layer, hole transport layer thicknesses, and its doping density on the performance of perovskite solar cells by simulation
Atanu Bag, R. Radhakrishnan, Reza Nekovei, and R. Jeyakumar
Solar Energy, 196, pp. 177–182.

Perovskite-CIGS Monolithic Tandem Solar Cells with 29.7% Efficiency: A Numerical Study Nikhil Shrivastav, Savita Kashyap, Jaya Madan, Ali K. Al-Mousoi, Mustafa K. A. Mohammed, M. Khalid Hossain, Rahul Pandey, and Jeyakumar Ramanujam
ACS Energy Fuels, 37, pp. 3083–3090.

The influence of top electrode work function on the performance of methylammonium lead iodide based perovskite solar cells having various electron transport layers
Atanu Bag, Rahul Pandey, Savita Kashyap, Jaya Madan and R. Jeyakumar
Chemical Physics Letters, 806, pp. 140009 (8 pages).

22.8% Efficient Ion implanted PERC Solar Cell with a Roadmap to Achieve 23.5% Efficiency: A Process and Device Simulation Study
Savita Kashyap, Jaya Madan, Rahul Pandey, Jeyakumar Ramanujam
Optical Materials, 128, pp. 112399 (10 pages).

Flexible CIGS, CdTe and a-Si:H based thin film solar cells – A Review
Jeyakumar Ramanujam, Douglas M Bishop, Teodor K Todorov, Oki Gunavan, Jatin Rath, Reza Nekovei, Elisa Artegiani, Alessandro Romeo
Prog. Mater. Sci., 110, 100619 (20 pages).

Interface studies by simulation on methylammonium lead iodide based planar perovskite solar cells for high efficiency
R. Jeyakumar, Atanu Bag, Reza Nekovei, R. Radhakrishnan
Solar Energy, 190, pp. 104–111.

Electrical and optical characterization of SiO_xN_y and SiO₂ dielectric layers and rear surface passivation by using SiO₂/SiO_xN_y stack layers with screen printed local Al-BSF for c-Si solar cells
Nagarajan Balaji, Huong Thi Thanh Nguyen, Cheolmin Park, Minkyu Ju, Jayapal Raja, Somenath Chatterjee, R. Jeyakumar and Junsin Yi
Current Applied Physics, 18, pp. 107-113.

Copper indium gallium selenide based solar cells – a review
Jeyakumar Ramanujam, Udai P Singh
Energy & Environmental Science, 10, pp. 1306-1319.

High-efficiency c-Si based interdigitated point contact back heterojunction solar cells
R. Jeyakumar, T. K. Maiti, Mahmoud M. Khader, Nikesh Kandasamy, Amit Verma, Reza Nekovei, J. Kumar, Nagarajan Balaji, Junsin Yi
J Mater Sci: Mater Electron, 28, pp. 9697-9703.

Surface passivation of boron emitters on n-type c-Si solar cells using silicon dioxide and PECVD silicon oxynitride stack
Nagarajan Balaji, Seunghwan Lee, Cheolmin Park, Jayapal Raja, Huong Thi Thanh Nguyen, Somenath Chatterjee , K. Nikesh, R. Jeyakumar and Junsin Yi
RSC Advances, 6, pp. 70040-70045.

Inorganic photovoltaics – Planar and nanostructured devices (Review Article)
Jeyakumar Ramanujam, Amit Verma, B. González-Díaz, R. Guerrero‐Lemus, Carlos del Cañizo, Elisa García-Tabarés, Ignacio Rey-Stolle, Filip Granek, Lars Korte, Mario Tucci, Jatin Rath, Udai P. Singh, Teodor Todorov, Oki Gunawan, S. Rubio, J. L. Plaza, Ernesto Diéguez, Björn Hoffmann, Silke Christiansen, George E. Cirlin
Prog. Mat. Sci. 82, pp. 294-404.

Simulation studies on crystalline silicon based back heterojunction solar cells
R. Jeyakumar
J Fundam Renewable Energy Appl. 5, p. 6, DOI: 10.4172/2090-4541.C1.006.

Surface Passivation Schemes for High-Efficiency c-Si Solar Cells – A Review
Nagarajan Balaji, Shahzada Qamar Hussain, Cheolmin Park, Jayapal Raja, Junsin Yi, R. Jeyakumar
Trans. Electr. Electron. Mater. 16, pp. 227-233.

c-Si solar cells formed from spin-on phosphoric acid and boric acid
Akash Yadav, Gajendra Singh, Reza Nekovei and R. Jeyakumar
Renewable Energy, 80, pp. 80-84.

Two-dimensional simulation studies on high-efficiency point contact back heterojunction (a-Si:H/c-Si) solar cells
R. Jeyakumar, T. K. Maiti, Amit Verma
Solar Energy, 105, pp. 109-115.

Fabrication of c-Si solar cells using boric acid as spin-on dopant for back surface field
Gajendra Singh, Amit Verma and R. Jeyakumar
R. Soc. Chem. Adv. 4, pp. 4225-4229.

Influence of emitter bandgap on interdigitated point contact back heterojunction (a-Si:H/c-Si) solar cell performance
R. Jeyakumar, T. K. Maiti, Amit Verma
Solar Energy Materials and Solar Cells, 109, pp. 119-203.

Photovoltaic properties of a-Si:H films grown by plasma enhanced chemical vapor deposition: A Review
Jeyakumar Ramanujam and Amit Verma
Materials Express, 2, pp. 177-196.

Synthesis and characterization of low-k films for large area imaging applications
R. Jeyakumar, Z. Gu, S. Sivoththaman, and A. Nathan
Microelectron. Eng. 99, pp. 58-61.

Silicon nanowire growth and properties: A Review
Jeyakumar Ramanujam, Daryoush Shiri and Amit Verma
Materials Express, 1, pp. 105-126.

Fabrication and characterization of amorphous Si/crystalline Si heterojunction devices for photovoltaic applications
M. F. Baroughi, R. Jeyakumar, Y. Vygranenko, F. Khalvati, S. Sivoththaman
J. Vac. Sci. and Technol. A 22, pp. 1015-1019.

Characterization of low permittivity (low-k) dielectric films for low temperature device integration
S. Sivoththaman, R. Jeyakumar, L. Ren, and A. Nathan
J. Vac. Sci and Technol. A 20, pp. 1149-1153.

Preparation of Zn(In)Se films from alloyed precursors
R. Jeyakumar, S. T. Lakshmikumar, and A. C. Rastogi
Mater. Res. Bull. 37, pp. 617-629.

A modified two stage process for the preparation of ZnTe_xSe_1-x films
R. Jeyakumar, G. K. Chadda, S. T. Lakshmikumar, and A. C. Rastogi
Mater. Res. Bull. 34, pp. 109-114.

Parametric investigation for the optimization of ZnSe film formation by low pressure Se vapour selenization process
R. Jeyakumar, S. T. Lakshmikumar, and A. C. Rastogi
Vacuum, 55, pp. 71-76.

Plasma assisted two stage selenization process for the preparation of low resistivity ZnSe films
R. Jeyakumar, G. K Chadda, S. T. Lakshmikumar, and A. C. Rastogi
J. Vac. Sci and Technol. B 17, pp. 1549-1552.

Electrochemical preparation and characterization of copper indium diselenide thin films
R. Jeyakumar, S. Ramamurthy, M. Jayachandran, and Mary J. Chockalingam
Mater. Res. Bull. 29, pp. 195-202.

Conference Proceedings

Development of Heterocyclic-C61-butyric Acid Methyl Ester/ Pyrazine (HCBM-Pyrazine) acceptor material for organic solar cells applications
Muath Bani Salim, Reza Nekovei, Tamer Elwaie, Jeyakumar Ramanujam, IEEE 19^th International Conference on Nanotechnology (IEEE-NANO), 22-26 July 2019, Macao, China. DOI: 10.1109/NANO46743.2019.8993877, pp. 54-58.

TDDFT Investigation of Hybrid Organic Inorganic Perovskite: CH₃NH₃PbCl₃
Ganesh Alwarappan, Aashik Padmanabachary, Md Raiyan Alam, Aashka Bhandari, Sunil Patil, R. Jeyakumar, Mohamed F. Shibl, Walid M.I. Hassan, Reza Nekovei, Amit Verma, IEEE 13^th Nanotechnology Materials and Devices Conference (NMDC), 14-17 Oct. 2018, Portland, OR, USA, DOI: 10.1109/NMDC.2018.8605842, pp. 1-4.

Novel method for the synthesis of conjugated polymer — Single-wall carbon nanotube nanowires
L. Costa, M. Al-Hashimi, K. Lansford, A. Terekhov, W. Hofmeister, R. Jeyakumar, A. Verma, IEEE 17^th International Conference on Nanotechnology (IEEE-NANO), 25-28 July 2017 Pittsburgh, PA, USA, DOI: 10.1109/NANO.2017.8117302, pp. 942-945.

Theoretical investigation of the oxygen bond dissociation energies in graphene oxide
Walid M. I. Hassan, Amit Verma, Reza Nekovei, R. Jeyakumar, Mahmoud M. Khader, IEEE Nanotechnology Materials and Devices Conference 2015 (NMDC), 13-16 Sept. 2015 Anchorage, Alaska, USA, DOI: 10.1109/NMDC.2015.7439264, pp. 1-2

Fabrication of c-Si solar cells using spin-on boric acid for back surface field
Gajendra Singh, Akash Yadav, Amit Verma and Jeyakumar Ramanujam, 17^th International Workshop on Physics of Semiconductor Devices (IWPSD), 10-13 Dec. 2013 Amity University, Noida, India, pp. 193-194.

Effect of ion-accelerated plasma hydrogenation and thermal treatments on hydrogen silsesquioxane (HSQ) low k dielectric films
R. Jeyakumar, L. Ren, and S. Sivoththaman, MRS Proc., on “Silicon Materials- Processing, Characterization and Reliability” 01-04 April 2002, San Francisco, USA, 716 (2002) B7.24.1-6, pp. 381-388.

Synthesis and characterization of methyltriethoxysilane based low permittivity polymeric dielectrics
Z. Gu, R. Jeyakumar, S. Sivoththaman, and A. Nathan, MRS Proc., on “Silicon Materials- Processing, Characterization and Reliability” 01-04 April 2002, San Francisco, USA, 716 (2002) B7.23.1-6, pp. 375-380.

Integration issues for polymeric dielectric in large area electronics
R. Jeyakumar, K. S. Karim, S. Sivoththaman, and A. Nathan, IEEE Proc., on “23^rd International Conference on Microelectronics (IEEE MIEL 2002)”,
12-15 May 2002, Nis, Yugoslavia, 23 (2002), pp. 543-546.

Reactive ion etching and via opening in low permittivity inter-level dielectric films for pixelated TFT arrays
R. Jeyakumar, K. S. Karim, S. Sivoththaman, and A. Nathan, 202^nd ECS Proc. “Sixth International Symposium on Thin Film Transistor Technologies VI (TFTT VI)”, 20-24 Oct. 2002, Salt Lake City, Utah, USA, 202 (2002) pp. 224-230.

Optical properties of ZnSe window layers in solar cells by two stage selenization technique
R. Jeyakumar, S. T. Lakshmikumar, and A. C. Rastogi, Proc. SPIE, Phys. of Semicon. Dev. 2733 (1995), pp. 569-571.

Electrosynthesis of CuInSe₂ thin films for solar cells
M. Jayachandran, Mary J. Chockalingam, R. Jeyakumar, and S. Ramamurthy National Solar Energy Convention,
26-28 Dec. 1992, New Delhi, India. pp. PV13-15.

International Conferences

Simulation Studies on Crystalline Silicon Based Back Heterojunction Solar cells
R. Jeyakumar, International Conference on Green Energy and Expo, 21-23 Sept. 2015, Orlando, USA.

Fabrication of c-Si solar cells using spin-on dopants
R. Jeyakumar, 3^rd International Symposium on Semiconductor Materials and Devices (ISSMD-3), 02-05 Feb. 2015,
Crystal Growth Centre, Anna University, Chennai-25, India.

Low-cost c-Si solar cells using spin-on dopants
Jeyakumar Ramanujam, Akash Yadav, Gajendra Singh and Amit Verma, 17^th International Workshop on Physics of Semiconductor Devices (IWPSD),
10-13 Dec. 2013, Amity University, Noida, India.

High-efficiency, low-cost Si solar cells
Jeyakumar Ramanujam and Amit Verma, 245^th ACS National Meeting & Exposition, 07-11 April 2013, New Orleans, LA, USA.

Using Planarization layer for vertical integration of TFT backplane with OLED in top-emitting active matrix display
Denis Striakhilev, Arokia Nathan, R. Jeyakumar, Sheng Tao and Christophe Py, Proc., 11^th Canadian Science and Technology Conference, August 18-22, 2003, Ottawa, Canada.

Fabrication and Characterization of Amorphous Si/Crystalline Si Heterojunction Devices for Photovoltaic Applications
M. F. Baroughi, R. Jeyakumar, F. Khalvati, S. Sivoththaman, in Proc., 11^th Canadian Science and Technology Conference, August 18-22, 2003, Ottawa, Canada.

Low thermal budget PECVD Silicon Nitride Passivation of Crystalline Silicon Devices
R. Jeyakumar, K. Zeater, S. Ali, M. Gharghi, G. Stevens, M. Hammerbacher, S. Sivoththaman, in Proc., 11^thCanadian Science and Technology Conference, August 18-22, 2003, Ottawa, Canada.

Characterization of low dielectric constant films for low temperature device integration
S. Sivoththaman, R. Jeyakumar, L. Ren, and A. Nathan, 10^th Canadian Science and Technology Conference, August 10-13, 2001, Ottawa, Canada.

National Conferences

Low pressure Se vapour selenization process for the formation of ZnSe window layers
R. Jeyakumar, S. T. Lakshmikumar, and A. C. Rastogi, 7^th Materials Research Society of India Conference,
February 9-13, 1996, Bangalore, India.

Pulse plating of CuInSe₂ thin films using NTA complexing agent for solar cells
M. Jayachandran, Mary J. Chockalingam, R. Jeyakumar, and S. Ramamurthy, 4^th National Convention of
Electrochemists, July 5-6, 1993, Madras, India.

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