Effect of Iodine Doped Pentacene Thin Film on the Performance of Organic Light Emitting Diode Dhrubajyoti Saikia, Ranjit Sarma Materials Science Forum, 2024 The study investigated the effect of iodine-doped pentacene film as a buffer layer in an organic light-emitting diode (OLED). In this study, an ITO (indium tin oxide)-based sample is used as a reference device for comparative purposes. In OLED devices, the buffer layers were deposited using the doping of iodine vapor with the pentacene materials under proper conditions. The thermal treatment of the doped pentacene film results in increasing the conductivity of the buffer layer. Surface morphology for the bilayer anode was carried out by FESEM (Field Emission Scanning Electron Microscope) analysis. In our work, maximum luminance of 2345 cd/m2 and current efficiency of 5.4 cd/A are obtained, along with more stability performance under annealing treatment in the device structure of FTO/iodine-doped pentacene (30 nm)/TPD [N, N′-Bis(3-methyl phenyl)-N, N′-diphenylbenzidine] (44 nm)/Alq3 [Tris(8-hydroxyquinoline)aluminum(III)] (52 nm)/LiF (lithium fluoride) (5 nm)/Al (aluminum) (110 nm).
Top-Contact Pentacene-Based Organic Thin Film Transistor with a Rubrene Layer in between Pentacene-Electrode Interface Tribeni Borthakur, Ranjit Sarma Ecs Journal of Solid State Science and Technology, 2022 Top-contact pentacene-based organic thin-film transistor (OTFT) with a rubrene interlayer in between pentacene-electrode [Al, Au] interface is reported. A study of the interlayer behavior of rubrene shows enhanced device performance of OTFT than that of the conventional OTFTs with only metal source-drain electrodes [Al, Au]. The improved performances of the device are attributed to the smoother pentacene surface for high carrier injection and mobility and decrease in contact resistance of the device. The device with a rubrene interlayer in between pentacene/Au interface shows better field-effect mobility of 3.3 cm2 v−1 s−1, On/Off ratio of 1.22 × 107, the threshold voltage of −3.8 V, and sub-threshold-slope of 0.31 V decade−1 respectively.
Hybrid La2O3-cPVP Dielectric for Organic Thin Film Transistor Applications Sagarika Khound, Jayanta K Sarmah, Ranjit Sarma Ecs Journal of Solid State Science and Technology, 2022 In this work, we have studied the electrical performance of cross-linked polyvinyl phenol (cPVP) modified lanthanum oxide (La2O3) bilayer dielectric film in pentacene thin film transistors (TFT). A simple spin-coating and room temperature operated cross-linking reaction of the hydroxyl moieties of PVP and the nitrogen groups of PMF were carried out to form the cross-linked PVP. The deposition of a thin 30 nm cPVP layer over the La2O3 layer provided a low leakage current (<10−7 A cm−2), causing a reduction in the interface trap density. Besides, the modified surface properties of the La2O3 layer were favorable for the growth of pentacene organic semiconductors. As a result, the current on-off ratio and the sub-threshold slope was improved from 104 and 1.0 V/decade to 105 and 0.67 V/decade. The La2O3∕cPVP pentacene TFT operated at −10 V also exhibited improvement in the field-effect mobility to 0.71 cm2 Vs−1 from 0.48 cm2 Vs−1 for the single-layer La2O3 (130 nm) device. Thus, our work demonstrates that the rare earth oxide La2O3 with cPVP is an excellent dielectric system in the context of emerging transistors with hybrid polymer gate dielectrics.
Study of tetracene thin film transistors using la2O3 as gate insulator Indian Journal of Pure and Applied Physics, 2009
RECENT SCHOLAR PUBLICATIONS
Fabrication of solution-processed pentacene-doped N, N-bis (3-methylphenyl)-N, N (phenyl)-benzidine (TPD) thin film-based organic light-emitting diode with optimized (8-hydroxy … D Saikia, R Sarma Bulletin of Materials Science 49 (2), 75 , 2026 2026
Performance of organic light emitting diode using Iodine doped-Emeraldine base form of PANI (EBPANI) interlayer under optimized condition over fluorine-doped tin oxide (FTO … D Saikia, R Sarma, P Saikia, G Sharma, SJ Borah Indian Journal of Physics, 1-9 , 2025 2025
Occurrence of Plant-Parasitic Nematodes in the Experimental Fields of SCS College of Agriculture, Assam Agricultural University, Dhubri, Assam, India G Devi, R Sarma Journal of Advances in Biology & Biotechnology 28 (8), 1443-1452 , 2025 2025
Remote Sensing-Based Pre-Harvest Acreage Assessment of Summer Paddy and Maize in Darrang and Nagaon Districts, Assam: A Pilot Study K Sarmah, R Sarma, PLN Raju INTERNATIONAL JOURNAL 12 (1), 94-99 , 2025 2025
Advances in Organic Farming: Crop Production and Management S Brahma, V Upadhyay, RK Nath, R Sarma, EP Devi CRC Press , 2024 2024 Citations: 2
Effect of Iodine Doped Pentacene Thin Film on the Performance of Organic Light Emitting Diode D Saikia, R Sarma Materials Science Forum 1131, 29-39 , 2024 2024 Citations: 1
CONSTRAINTS IN VEGETABLE PRODUCTION IN CHAR AREAS OF DHUBRI DISTRICT, ASSAM B SARMA, RK NATH, M CHOUDHURY, P AHMED, K DAS, GK UPAMAYA, ... INTERNATIONAL JOURNAL 7 (11), 345-347 , 2024 2024
Transfer of Drift Wave Turbulence Energy to Langmuir Waves in Inhomogeneous Magnetospheric Plasma RK Sarma, PN Deka Brazilian Journal of Physics 53 (6), 150 , 2023 2023
Effect of tungsten oxide as a buffer layer on the device performance and stability of organic light diodes D Saikia, R Sarma Pramana 97 (4), 149 , 2023 2023 Citations: 2
Amplification of Electrostatic Wave at the Cost of Kinetic Alfvén Wave Turbulence Energy in Auroral Zone RK Sarma, PN Deka Journal of Scientific Research 15 (3), 583-593 , 2023 2023
Study of the Performance Enhancement of MoO3/Au Bilayer Source–Drain Electrode for Top‑Contact Pentacene‑Based OTFT TBR Sarma Journal of Electronic Materials , 2022 2022 Citations: 3
Top-Contact Pentacene-Based Organic Thin Film Transistor with a Rubrene Layer in between Pentacene-Electrode Interface T Borthakur, R Sarma ECS Journal of Solid State Science and Technology 11 (4), 045005 , 2022 2022 Citations: 8
Scope of cassava (Manihot esculenta Crantz) in improving livelihood of tribal people in rural areas of Kokrajhar district of Assam, India S Brahma, V Upadhaya, RK Nath, P Sarma, R Sarma Pharm Innova 11, 1298-1302 , 2022 2022 Citations: 4
A Comprehensive Appraisal of the Farming Scenario in Riverine Areas of Lower Assam, India P Ahmed, B Sarma, M Choudhury, RK Nath, H Ojah, K Das, R Sarma Asian Journal of Agricultural Extension, Economics & Sociology 40 (8), 288-294 , 2022 2022 Citations: 1
A study on participation of rural tribal women farmers in horticulture and household activities in Assam RK Nath, S Brahma, R Sarma, P Ahmed Intl. J. Recent Scienti. Res 11 (5), 35651-35653 , 2022 2022 Citations: 4
Hybrid La 2 O 3 -cPVP Dielectric for Organic Thin Film Transistor Applications S Khound, JK Sarmah, R Sarma ECS Journal of Solid State Science and Technology 11 (1), 013007 , 2022 2022 Citations: 17
Characterization of organic light-emitting diode using a rubrene interlayer between electrode and hole transport layer D Saikia, R Sarma Bulletin of Materials Science 43 (1), 35 , 2020 2020 Citations: 5
Production constraints of banana cultivation in western district of Assam B Sarma, M Choudhury, R Sarma, RK Nath Journal of Pharmacognosy and Phytochemistry 9 (4), 1829-1830 , 2020 2020 Citations: 7
Socio-economic status of growers and constraints in banana cultivation in western districts of Assam B Sarma, M Choudhury, RK Nath, M Bhagawati, R Sarma International Journal of Farm Sciences 10 (3and4), 31-34 , 2020 2020 Citations: 3
Effect of soil and foliar application of nitrogen on morpho-physiological, growth characters and seed yield of rapeseed L Pegu, P Ahmed, B Rahman, P Deka, R Sarma Int. J. Curr. Microbiol. App. Sci 9 (9), 1434-1440 , 2020 2020 Citations: 2
MOST CITED SCHOLAR PUBLICATIONS
Diversity of bird fauna in North East India PK Saikia, MK Saikia, PC Bhattacharjee, J Kalita, D Dutta, R Sarma, ... Journal of Assam Science Society 41 (4), 379-396 , 2000 2000 Citations: 35
Pentacene based thin film transistors with high-k dielectric Nd2O3 as a gate insulator R Sarma, D Saikia, P Saikia, PK Saikia, B Baishya Brazilian Journal of Physics 40, 357-360 , 2010 2010 Citations: 33
Low-Cost Bilayer Electrode for Pentacene-Based OTFTs R Sarma, D Saikia IEEE Electron Device Letters 32 (2), 209-211 , 2010 2010 Citations: 20
Hybrid La 2 O 3 -cPVP Dielectric for Organic Thin Film Transistor Applications S Khound, JK Sarmah, R Sarma ECS Journal of Solid State Science and Technology 11 (1), 013007 , 2022 2022 Citations: 17
Organic light-emitting diodes with a perylene interlayer between the electrode–organic interface D Saikia, R Sarma Journal of Electronic Materials 47 (1), 737-743 , 2018 2018 Citations: 17
Improved performance of organic light-emitting diode with vanadium pentoxide layer on the FTO surface DSR SARMA Pramana – J. Phys. 88 (83), 1-6 , 2017 2017 Citations: 17
Low-voltage organic thin film transistors (OTFTs) using crosslinked polyvinyl alcohol (PVA)/neodymium oxide (Nd 2 O 3 ) bilayer gate dielectrics S Khound, R Sarma Applied Physics A 124 (1), 41 , 2018 2018 Citations: 16
Pentacene thin film transistors using La 2 O 3 as gate insulator R Sarma, D Saikia, K Konwar, B Baishya Indian Journal of Physics 84 (5), 547-552 , 2010 2010 Citations: 12
Top-Contact Pentacene-Based Organic Thin Film Transistor (OTFT) with N , N ′-Bis(3-Methyl Phenyl)- N , N ′-Diphenyl Benzidine (TPD)/Au Bilayer Source-Drain … T Borthakur, R Sarma Journal of Electronic Materials 47 (1), 627-632 , 2018 2018 Citations: 11
High Performance Organic Thin Film Transistors Using Pentacene-Based Rare-Earth Oxide Bilayer Gate Dielectric: Khound and Sarma S Khound, R Sarma Journal of Electronic Materials 48 (7), 4491-4497 , 2019 2019 Citations: 10
Performance enhancement of top contact pentacene-based organic thin-film transistor (OTFT) using perylene interlayer between organic/electrode interface T Borthakur, R Sarma Applied Physics A 123 (3), 207 , 2017 2017 Citations: 10
Effect of nitrogen sources on growth, yield and quality of banana cv. Barjahaji (Musa AAA group, Cavendish sub-group) R Sharma Ph. D Thesis, submitted to Assam Agricultural University , 2002 2002 Citations: 10
Top-Contact Pentacene-Based Organic Thin Film Transistor with a Rubrene Layer in between Pentacene-Electrode Interface T Borthakur, R Sarma ECS Journal of Solid State Science and Technology 11 (4), 045005 , 2022 2022 Citations: 8
Effects of V2O5/Au bi-layer electrodes on the top contact Pentacene-based organic thin film transistors T Borthakur, R Sarma Indian Journal of Physics 91 (5), 563-567 , 2017 2017 Citations: 8
Study of tetracene thin film transistors using La2O3 as gate insulator R Sarma, D Saikia Indian journal of pure & applied physics 47 (12), 876-879 , 2009 2009 Citations: 8
Production constraints of banana cultivation in western district of Assam B Sarma, M Choudhury, R Sarma, RK Nath Journal of Pharmacognosy and Phytochemistry 9 (4), 1829-1830 , 2020 2020 Citations: 7
A comparative study of the influence of nickel oxide layer on the FTO surface of organic light emitting diode D Saikia, R Sarma Indian Journal of Physics 92 (3), 307-313 , 2018 2018 Citations: 7
Performance improvement of organic light emitting diode using 4,4 -N,N -dicarbazole-biphenyl (CBP) layer over fluorine-doped tin oxide (FTO) surface with doped light emitting … RS DHRUBAJYOTI SAIKIA Pramana – J. Phys. 91 (65), 3-9 , 2018 2018 Citations: 6
Low threshold voltage pentacene OTFTs with La2 O3 gate insulating layer using TSD PK Saikia, UJ Mahanta, P Saikia, B Baishya, R Sarma, D Saikia Chiang Mai J. Sci. 2012; 39(2) : 263-269 39 (2), 263-269 , 2012 2012 Citations: 6
Spectral response characteristics of photoelectronic properties of vacuum evaporated CdSe thin films K Sarmah, R Sarma, HL Das Journal of Non-oxide Glasses Vol 1 (2), 131-141 , 2009 2009 Citations: 6
