Band engineering of a PTAA hole transporting layer in the n-i-p architecture of MAPbI3-based perovskite solar cells Sachin A. Pawar, Abdurashid Mavlonov, Hiroki Mori, Yu Kawano, Kensuke Kojima, Jun Azuma, Takayuki Negami, Takashi Minemoto Sustainable Energy and Fuels, 2025 This work reports the synthesis of poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) with different chemical skeletal structures, resulting in varied highest occupied molecular orbital (HOMO) positions.
Crystalline phase control of BiVO4 thin films using RF sputtering Namiki Uezono, Jiaqi Liu, Sachin A. Pawar, Muhammad Monirul Islam, Shigeru Ikeda, Takeaki Sakurai Japanese Journal of Applied Physics, 2023 A selective fabrication method for monoclinic-scheelite (m-s) BiVO4 and tetragonal-zircon (t-z) BiVO4 thin films using radio fRequency (RF) sputtering from a single target was developed. The kinetic energy of the sputtered atoms was controlled by varying the sputtering power to obtain BiVO4 films with m-s and t-z crystalline phases. Although the band gap of the t-z BiVO4 phase (3.0 eV) was larger than that of m-s BiVO4 (2.5 eV), the deposited t-z BiVO4 films showed a comparable photocurrent density (1.5 mA cm−2) at 1.23 V versus the reversible hydrogen electrode (400 W Xe lamp). This was mainly because of the reduced sputtering damage in the t-z BiVO4 crystal, which originated from the low sputtering power as well as the deep valence-band position in t-z BiVO4 that enabled the efficient utilization of the photocarriers. This work provides insights into crystalline phase control using the particle kinetic energy in sputtering.
Effect of sulfur doping on the photocatalytic performance of sputtered BiVO4 thin films Shukur Gofurov, Namiki Uezono, Lingga Ghufira Oktariza, Jiaqi Liu, Sachin Pawar, Muhammad M. Islam, Takeaki Sakurai Japanese Journal of Applied Physics, 2023 BiVO4 thin films doped with various concentrations of sulfur were fabricated using RF sputtering followed by post-deposition sulfurization. The incorporation of sulfur in the samples was calculated to be approximately 8–11 at% from the S2s peak in their X-ray photoelectron spectra. The optical bandgap of sulfur-doped BiVO4 was generally smaller than that of the undoped sample. BiVO4 films doped with ∼8 at% sulfur showed the highest photoelectrochemical performance compared to the undoped sample. Almost similar minority-carrier lifetimes in undoped and low sulfur-doped BiVO4, measured by time resolve photoluminescence, suggest that the crystal qualities in terms of the recombination properties are roughly the same for both cases. Thus, although further investigation may be necessary, the improved photocurrent in 8 at% sulfur-doped BiVO4 in our study can roughly be attributed to the decrease in the bandgap, which facilitates more photoexcited carriers to contribute to the photoelectrochemical reaction. A further increase in sulfur doping above 10 at% distorted the BiVO4 local crystal structure, inducing defects, thus resulting in a lower photocurrent.
Electronic Structure of Orthorhombic Bi4V2O11and Role of Gap States in Photoelectrochemical Water Splitting Jiaqi Liu, Kenichi Ozawa, Namiki Uezono, Sachin A. Pawar, Shugo Suzuki, Aboulaye Traoré, Muhammad Monirul Islam, Kazuhiko Mase, Takeaki Sakurai Journal of Physical Chemistry C, 2023 A group of bismuth vanadium oxides shows promise as an excellent material for photoanodes in water splitting. However, the efficiency of Bi 4 V 2 O 11 in water splitting is not satisfactory compared to BiVO 4 . In this study, we investigated the electronic structure of orthorhombic Bi 4 V 2 O 11 using density functional theory (DFT) and synchrotron soft X-ray spectroscopy techniques to clarify the causes of inefficiency. Our DFT calculations of the two-fold superlattice, as confirmed by near-edge X-ray absorption fine structure measurements, revealed its indirect-band-gap nature. An angle-resolved photoelectron spectroscopy study identified the states within the band gap, and the resonant photoemission technique and DFT simulation clarified that the origin of the gap states was anisotropic localization of electrons around V–O tetrahedra. Water absorption enhances the gap states, which dramatically impedes the kinetics of water oxidation reactions. Our results reveal the role of gap states in water oxidation reactions and offer new insights into manipulating gap states in 3d transition metal oxides.
A Simple Method to Produce an Aluminum Oxide-Passivated Tungsten Diselenide/n-Type Si Heterojunction Solar Cell with High Power Conversion Efficiency Malik Abdul Rehman, Minjae Kim, Sachin A. Pawar, Sewon Park, Naila Nasir, Dong-eun Kim, Muhammad Farooq Khan, Van Huy Nguyen, Akendra Singh Chabungbam, Yongho Seo, Takeaki Sakurai, Seung-Hyun Chun, Do Hyoung Koo, Chul-Ho Lee, Seong Chan Jun, Hyung-Ho Park International Journal of Energy Research, 2023 Transition metal dichalcogenide (TMDC) materials are attractive candidates for 2D solar cell devices thanks to their straightforward integration with various substrates and traditional semiconductor technologies, wide band gap ranges over the visible light spectrum, and high absorption coefficient values. Although there are several previous reports on the fabrication of 2D material-based solar cells, difficult and complex processes in the fabrication are highly required to be modified for wider use in daily life applications. Photolithography, the most commonly used manufacturing process for TMDC-based solar cells, is complicated. In this study, we demonstrate that the fabrication of 2D tungsten diselenide (WSe2) by adopting a wet transfer process with thermal release tape simplifies the manufacturing steps for TMDC-based solar cell devices. This simplification not only reduces the production cost by excluding several factors such as transmittance, thermal expansion, surface flatness, and durability but also improves the yield. Furthermore, a proof-of-concept demonstration of creating a WSe2/Si junction with an aluminum oxide (Al2O3) antireflective coating provided a power conversion efficiency of 6.39%, which is a significant improvement over that of a WSe2/Si solar cell without the antireflective coating layer (1.08%).
Self-Flux Method in Sputtered BiVO4Films for Enhanced Photoelectrochemical Performance Jiaqi Liu, Namiki Uezono, Kazuya Tajima, Sachin A. Pawar, Muhammad Monirul Islam, Shigeru Ikeda, Takeaki Sakurai ACS Applied Energy Materials, 2022 Bismuth vanadate (BiVO4) is a well-sought candidate as a photoanode in photoelectrochemical (PEC) water splitting. The mismatch between the V/Bi ratio affects the photocatalytic efficiency of BiVO4 films fabricated using the large-area sputtering method. We adopt a facile method to finely control the V/Bi ratio in sputtered films by changing the oxygen partial pressure. We observed the formation of various phases, with a change of V/Bi ratio in the films ranging from 0.5 to 2, and found that the segregated V2O5 acts as a self-flux in improving the crystallinity of BiVO4, resulting in a long carrier lifetime. With the prolonged carrier lifetime from 0.098 to 0.211 ns, the optimized films realize a photocurrent density of 1.97 mA/cm2 at 1.23 V versus reversible hydrogen electrode. However, V2O5 itself does not exhibit a lifetime comparable to BiVO4, which implies that an excess amount of V2O5 is detrimental to PEC performance. These findings point to the significance of a slightly V-rich growth environment for advancing the PEC performance of BiVO4 materials. Our work provides insights into the growth of high-quality crystals by controlling composition in other multielement oxides.
Mechanism of incorporation of zirconium into BiVO4Visible-Light Photocatalyst Imane Abdellaoui, Muhammad M. Islam, Mikas Remeika, Sorai Kanno, Riku Okamoto, Kazuya Tajima, Sachin A. Pawar, Yun Hau Ng, Christian Budich, Tsuyoshi Maeda, Takahiro Wada, Shigeru Ikeda, Takeaki Sakurai Journal of Physical Chemistry C, 2021
Hydrothermal synthesis of CdSe microspheres Sachin A. Pawar, D. S. Patil, S. B. Pawar, T. S. Bhat, P. P. Waifalkar, S. H. Pisal, P. N. Bhosale, P. S. Patil Aip Conference Proceedings, 2013
Influence of Mg concentration in Zn1-xMgxO buffer layers for enhanced Cu2 (Sn, Ge) S3 solar cells performance I Tomohiro, B Ergashev, Y Kawano, A Mavlonov, SA Pawar, T Minemoto Optical Materials 150, 115211 , 2024 2024 Citations: 3
Effect of sulfur doping on the photocatalytic performance of sputtered BiVO4 thin films S Gofurov, N Uezono, LG Oktariza, J Liu, S Pawar, MM Islam, T Sakurai Japanese Journal of Applied Physics 62 (SK), SK1051 , 2023 2023 Citations: 8
Electronic Structure of Orthorhombic Bi 4 V 2 O 11 and Role of Gap States in Photoelectrochemical Water Splitting J Liu, K Ozawa, N Uezono, SA Pawar, S Suzuki, A Traoré, MM Islam, ... The Journal of Physical Chemistry C 127 (23), 11195-11203 , 2023 2023 Citations: 6
Crystalline phase control of BiVO4 thin films using RF sputtering N Uezono, J Liu, SA Pawar, MM Islam, S Ikeda, T Sakurai Japanese Journal of Applied Physics 62 (SK), SK1001 , 2023 2023 Citations: 6
A Simple Method to Produce an Aluminum Oxide-Passivated Tungsten Diselenide/n-Type Si Heterojunction Solar Cell with High Power Conversion Efficiency MA Rehman, M Kim, SA Pawar, S Park, N Nasir, D Kim, MF Khan, ... International Journal of Energy Research 2023 , 2023 2023 Citations: 3
Cobalt-based metal oxide coated with ultrathin ALD-MoS2 as an electrode material for supercapacitors SA Pawar, DS Patil, DK Nandi, MM Islam, T Sakurai, SH Kim, JC Shin Chemical Engineering Journal 435, 135066 , 2022 2022 Citations: 47
Self-Flux Method in Sputtered BiVO 4 Films for Enhanced Photoelectrochemical Performance J Liu, N Uezono, K Tajima, SA Pawar, MM Islam, S Ikeda, T Sakurai ACS Applied Energy Materials 5 (4), 4191-4201 , 2022 2022 Citations: 9
Bismuth manganese oxide based electrodes for asymmetric coin cell supercapacitor AM Teli, TS Bhat, SA Beknalkar, SM Mane, LS Chaudhary, DS Patil, ... Chemical Engineering Journal 430, 133138 , 2022 2022 Citations: 111
Porous In2O3 thick films as a low temperature NO2 gas detector SP Patil, VL Patil, SA Vanalakar, SS Shendage, SA Pawar, JH Kim, J Ryu, ... Materials Letters 306, 130916 , 2022 2022 Citations: 28
Facile hydrothermal deposition of Copper-Nickel sulfide nanostructures on nickel foam for enhanced electrochemical performance and kinetics of charge storage AM Teli, SA Beknalkar, SM Mane, LS Chaudhary, DS Patil, SA Pawar, ... Applied Surface Science 571, 151336 , 2022 2022 Citations: 32
Fabrication of high energy density supercapacitor device based on hollow iridium oxide nanofibers by single nozzle electrospinning SA Beknalkar, AM Teli, NS Harale, DS Patil, SA Pawar, JC Shin, PS Patil Applied Surface Science 546, 149102 , 2021 2021 Citations: 69
Mechanism of Incorporation of Zirconium into BiVO 4 Visible-Light Photocatalyst I Abdellaoui, MM Islam, M Remeika, S Kanno, R Okamoto, K Tajima, ... The Journal of Physical Chemistry C 125 (6), 3320-3326 , 2021 2021 Citations: 29
An all chemical route to design a hybrid battery-type supercapacitor based on ZnCo2O4/CdS composite nanostructures DS Patil, AM Teli, WJ Choi, SA Pawar, JC Shin, HJ Kim Current Applied Physics 20 (12), 1416-1423 , 2020 2020 Citations: 18
Enhanced battery-type supercapacitor performance based on composite structure of nickel cobaltite and cadmium sulfide SA Pawar, DS Patil, JC Shin, HJ Kim Journal of Electroanalytical Chemistry 873, 114370 , 2020 2020 Citations: 24
Erratum to “Substantially enhanced photoelectrochemical performance of TiO2 nanorods/CdS nanocrystals heterojunction photoanode decorated with MoS2 nanosheets”[Appl. Catal. B … SSM Bhat, SA Pawar, D Potphode, CK Moon, JM Suh, C Kim, S Choi, ... Applied Catalysis B: Environmental 269, 118261 , 2020 2020 Citations: 1
Effect of annealing temperature on charge storage kinetics of an electrospun deposited manganese oxide supercapacitor AM Teli, SA Beknalkar, DS Patil, SA Pawar, DP Dubal, VY Burute, ... Applied Surface Science 511, 145466 , 2020 2020 Citations: 47
Magnetodielectric Effect in Microwave-Sintered Ba 0.8 Sr 0.2 TiO₃ and Co 0.9 Ni 0.1 Fe₂O₄ Composite SM Mane, SA Pawar, DS Patil, SH Lee, JC Shin Applied Science and Convergence Technology 29 (2), 31-35 , 2020 2020 Citations: 2
CoFe layered double hydroxide for enhanced electrochemical performance DS Patil, SA Pawar, SH Lee, JC Shin Journal of Electroanalytical Chemistry, 114012 , 2020 2020 Citations: 59
Magnetoelectric, magnetodielectric effect and dielectric, magnetic properties of microwave-sintered lead-free x (Co0. 9Ni0. 1Fe2O4)-(1-x)[0.5 (Ba0. 7Ca0. 3TiO3)-0.5 (BaZr0 … SM Mane, SA Pawar, DS Patil, SB Kulkarni, NT Tayade, JC Shin Ceramics International 46 (3), 3311-3323 , 2020 2020 Citations: 56
Morphological evolution and electrochemical cycling for enhanced electrochemical activity of MnCo-layered double hydroxide DS Patil, SA Pawar, J Ryu, JC Shin, HJ Kim Electrochimica Acta 331, 135378 , 2020 2020 Citations: 24
MOST CITED SCHOLAR PUBLICATIONS
Development of Cu2SnS3 (CTS) thin film solar cells by physical techniques: A status review AC Lokhande, RBV Chalapathy, M He, E Jo, M Gang, SA Pawar, ... Solar Energy Materials and Solar Cells 153, 84-107 , 2016 2016 Citations: 242
Investigations on silver/polyaniline electrodes for electrochemical supercapacitors DS Patil, JS Shaikh, SA Pawar, RS Devan, YR Ma, AV Moholkar, JH Kim, ... Physical Chemistry Chemical Physics 14 (34), 11886-11895 , 2012 2012 Citations: 159
Substantially enhanced photoelectrochemical performance of TiO2 nanorods/CdS nanocrystals heterojunction photoanode decorated with MoS2 nanosheets SSM Bhat, SA Pawar, D Potphode, CK Moon, JM Suh, C Kim, S Choi, ... Applied Catalysis B: Environmental 259, 118102 , 2019 2019 Citations: 144
Bismuth manganese oxide based electrodes for asymmetric coin cell supercapacitor AM Teli, TS Bhat, SA Beknalkar, SM Mane, LS Chaudhary, DS Patil, ... Chemical Engineering Journal 430, 133138 , 2022 2022 Citations: 111
Chemically synthesized PbS Nano particulate thin films for a rapid NO2 gas sensor VV Burungale, RS Devan, SA Pawar, NS Harale, VL Patil, VK Rao, YR Ma, ... Materials Science-Poland 34 (1), 204-211 , 2016 2016 Citations: 101
Electrochemical supercapacitor electrode material based on polyacrylic acid/polypyrrole/silver composite DS Patil, SA Pawar, RS Devan, MG Gang, YR Ma, JH Kim, PS Patil Electrochimica Acta 105, 569-577 , 2013 2013 Citations: 98
Core-shell structure of Co 3 O 4 @CdS for high performance electrochemical supercapacitor DS Patil, SA Pawar, JC Shin Chemical Engineering Journal 335, 693-702 , 2018 2018 Citations: 93
Hexagonal sheets of Co3O4 and Co3O4-Ag for high-performance electrochemical supercapacitors SA Pawar, DS Patil, JC Shin Journal of Industrial and Engineering Chemistry 54, 162-173 , 2017 2017 Citations: 92
Quantum dot sensitized solar cell based on TiO2/CdS/CdSe/ZnS heterostructure SA Pawar, DS Patil, HR Jung, JY Park, SS Mali, CK Hong, JC Shin, ... Electrochimica Acta 203, 74-83 , 2016 2016 Citations: 72
Effect of Concentration on the Charge Storage Kinetics of Nanostructured MnO2 Thin-Film Supercapacitors Synthesized by the Hydrothermal Method AM Teli, SA Beknalkar, SA Pawar, DP Dubal, TD Dongale, DS Patil, ... Energies 13 (22), 6124 , 2020 2020 Citations: 70
Fabrication of high energy density supercapacitor device based on hollow iridium oxide nanofibers by single nozzle electrospinning SA Beknalkar, AM Teli, NS Harale, DS Patil, SA Pawar, JC Shin, PS Patil Applied Surface Science 546, 149102 , 2021 2021 Citations: 69
Hydrothermal growth of photoelectrochemically active titanium dioxide cauliflower-like nanostructures SA Pawar, RS Devan, DS Patil, VV Burungale, TS Bhat, SS Mali, SW Shin, ... Electrochimica Acta 117, 470-479 , 2014 2014 Citations: 69
Electrochemical battery-type supercapacitor based on chemosynthesized Cu2SAg2S composite electrode SA Pawar, DS Patil, JC Shin Electrochimica Acta 259, 664-675 , 2018 2018 Citations: 68
A Simple Aqueous Precursor Solution Processing of Earth-Abundant Cu2SnS3 Absorbers for Thin-Film Solar Cells M. P. Suryawanshi, U. V. Ghorpade, S. W. Shin, S. A. Pawar, I. Y. Kim, C. W ... ACS Appl. Mater. Interfaces 8 (18), 11603–11614 , 2016 2016 Citations: 63
Polyaniline based electrodes for electrochemical supercapacitor: Synergistic effect of silver, activated carbon and polyaniline DS Patil, SA Pawar, RS Devan, SS Mali, MG Gang, YR Ma, CK Hong, ... Journal of Electroanalytical Chemistry 724, 21-28 , 2014 2014 Citations: 62
CoFe layered double hydroxide for enhanced electrochemical performance DS Patil, SA Pawar, SH Lee, JC Shin Journal of Electroanalytical Chemistry, 114012 , 2020 2020 Citations: 59
Ag Nanoparticles Connected to the Surface of TiO 2 Electrostatically for Antibacterial Photoinactivation Studies SP Deshmukh, SB Mullani, VB Koli, SM Patil, PJ Kasabe, PB Dandge, ... Photochemistry and photobiology 94 (6), 1249-1262 , 2018 2018 Citations: 57
Magnetoelectric, magnetodielectric effect and dielectric, magnetic properties of microwave-sintered lead-free x (Co0. 9Ni0. 1Fe2O4)-(1-x)[0.5 (Ba0. 7Ca0. 3TiO3)-0.5 (BaZr0 … SM Mane, SA Pawar, DS Patil, SB Kulkarni, NT Tayade, JC Shin Ceramics International 46 (3), 3311-3323 , 2020 2020 Citations: 56
Improved solar cell performance of chemosynthesized cadmium selenide pebbles SA Pawar, RS Devan, DS Patil, AV Moholkar, MG Gang, YR Ma, JH Kim, ... Electrochimica Acta 98, 244-254 , 2013 2013 Citations: 56
Facile preparation and enhanced capacitance of the Ag-PEDOT: PSS/polyaniline nanofiber network for supercapacitors DS Patil, SA Pawar, JH Kim, PS Patil, JC Shin Electrochimica Acta 213, 680-690 , 2016 2016 Citations: 53