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 Sachin Rondiya

Sachin Rondiya

Research Associate (with Dr Nelson Dzade)

I am currently a Postdoctoral Research Associate in the School of Chemistry, Cardiff University, United Kingdom (UK). Clean and renewable energy is perhaps one of the most important research areas at the current moment for our green and sustainable future. My work is interdisciplinary in nature involving physics, chemistry, materials science, mechanical engineering, and more. This diverse expertise helps me to deal with a wide range of issues across the fields of nanotechnology and advanced functional materials for energy harvesting, storage, and conservation. My primary research interests and experience are in the understanding and improving, emerging material based device performance. My research is focused on the optical and electronic properties of novel nanoscale semiconductor systems for a wide variety of applications, including but not limited to photovoltaics (PV), photoelectrochemical (PEC) water splitting, Li-ion and Na-ion batteries, supercapacitors, photodetector, field emission, and ultrafast photochemistry. I am a hard-core lover of interfaces (band alignments, band offset, and monitoring carrier dynamics) and I have strongly believed the interface investigation will open new avenues for developing more efficient clean energy devices.

EDUCATION

2014−2017           Ph.D. Physics, Department of Physics, Savitribai Phule Pune University, India.

2012−2014           M. Phil Physics, Department of Physics, Savitribai Phule Pune University, India.

2009−2012           M.Sc Physics, Department of Physics, Savitribai Phule Pune University, India.

RESEARCH EXPERIENCE and POSITIONS

Jan 2019-date       Post-Doctoral Research Associate

School of Chemistry, Cardiff University, Cardiff, United Kingdom.

Supervisor – Dr. Nelson Y. Dzade

Feb-Dec 2018       Post-Doctoral Research Fellow

Institute of Nano Science and Technology (INST), Mohali, Punjab, India.

Supervisor – Prof. Hirendra N. Ghosh

SCHOLARSHIPS and AWARDS

2018                      Visiting Scientist Fellowship Award, the Scientific & Technological Research Council of Turkey.

2018                      Visiting Scientist Fellowship Award, IMEC and Hasselt University, Energy Valley, Belgium.

2017                       Dr. M. R. Bhide Award, Department of Physics, Savitribai Phule Pune University, India.

Award for Innovation in Industrially Applicable Research.

2015                       Dr. Babasaheb Ambedkar National Research Fellowship Award, Government of India.

2020

2019

(I) Photovoltaics

MaterialsPerovskites, Cu-based ternary, and quaternary semiconductors

(a) Band alignment and Band offset - I am working on different strategies to dramatically increase the efficiency and lower the cost of solar energy. The different physical and chemical properties of interfacial layers often cause unfavorable band alignment and interfacial states that lead to high carrier recombination and eventually result in lower device efficiency. Under this research theme, my goal is to employ experimental methods to engineer the optical and structural properties of semiconducting materials, to reduce recombination due to interface trap states. Carrier management through interface engineering via emerging materials will help to achieve ultra-high efficiency in perovskite and earth-abundant Cu-Zn-Sn-S-Se material based solar cells.

Rondiya et al, Chemistry of Materials, 29, 3133-3142, 2017. (10.1021/acs.chemmater.7b00149)

(b) Novel Strategies to improve solar cells efficiency – Activities in my research range for conceiving and creating new materials, through to theoretical understanding of the optoelectronic process in devices. Currently, I am investigating the stability issues in higher efficiency based on perovskite solar cells. Recently, we have achieved the stabilized power conversion efficiency of 16.78 % (small active area 0.3 × 0.3 cm2) and 15.82 % (large active area 1 × 1 cm2) under 100 mWcm-2 irradiation 5% A-doped with QDs passivation in CsPbI2Br based device. In one more project, we demonstrated PCE of 17.45 % (under reverse scan) for a small area (0.09 cm2) with record open-circuit voltage (VOC) of 1.334 V and fill factor (FF) of 80.1% for fully air-processed dynamic hot-air assisted M:CsPbI2Br for stable all-inorganic perovskite solar cells.

(II) Ultrafast Laser Spectroscopy

MaterialsPerovskites, Cu-based ternary, and quaternary semiconductors

Ultrafast charge carrier and interfacial electron and hole transfer dynamics research are directed towards a fundamental understanding of carrier dynamics in a variety of solar cell systems, including semiconductor nanocrystals, nano-heterostructure, and perovskite solar cells with the aid of cutting-edge nanotechnology, and ultrafast laser spectroscopy.

Rondiya et al, ACS Appl. Energy Mater. 2020, 3, 5153−5162. (10.1021/acsaem.9b02314)

(III) Field Emission

MaterialsNano-heterostructure (Au-SnSe, rGO/MnO2, etc)

Field electron emission is the extraction of electrons from metal or semiconductors via quantum tunneling through the surface potential barrier by applying a very strong electric field, typically of the order of 106 –107 V/cm. Field emission has diverse technological applications in various vacuum micro/ nanoelectronic devices. There is a great interest in the development of field emission cathodes using nanostructured materials, such as SnSe, MnO2, and graphene are known to be field emitters. I am using novel strategies for improving field emission performance via surface and electronic modifications of the nanostructures.

Rondiya et al, Scientific Reports, 2020, 10:2358. (10.1038/s41598-020-58840-8)

Rondiya et al, RSC Adv., 2020. (10.1039/d0ra03360j)

(IV) Photoelectrochemical (PEC) water splitting

MaterialsNano-heterostructure (1D ZnO, core-shell ZnO/CdS nanostructure, etc)

Photocatalytic and Photoelectrochemical water splitting for hydrogen generation and CO2 reduction to green fuel through engineered nanomaterials is my prime goal. I have a focus on the design and development of new semiconductors as photocatalyst by constructing nanostructures, heterostructures with other materials, or through defect engineering.

Rokade et al, J. Solid State Electrochem., 21(9), 2639-2648, 2017. (10.1007/s10008-016-3427-9)

(V) Batteries

Materialsα-MnO2

I am investigating a variety of electrode materials for applications in lithium-ion, and sodium-ion batteries (NIBs). Recently, we have completed α-MnO2 nanorods investigation, as a stable cathode material for sodium-ion batteries. The α-MnO2 exhibited impressive electrochemical performance as a cathode material for NIBs when charged and discharged in the voltage range of 1.5–4.0 V, rendering an initial discharge capacity of 73.7 mA h/g at C/20 with poor capacity retention in NaPF6 (EC+DMC) electrolyte. In comparison, the cycling performance is improved (75.6 % after 600 cycles) when using NaPF6 (EC+DMC) electrolyte though suffers from minute less capacity (66.5 mAh/g).

(VI) Supercapacitors

MaterialsFeSe2, VTe2, rGO based heterostructures

Supercapacitors are energy storage systems characterized by long cycle life and high power density. They store energy in electric double layers formed in the immediate vicinity of highly porous electrodes. Currently, we have completed graphene composite, FeSe2, VTe2 materials investigation, and achieved capacity as an efficient energy storage device. We have observed excellent performance through the ease of fabrication process providing its candidature for its practical use for large scale integration.