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Prasenjit Mandal

Lund University, Jawaharlal Nehru Centre for Advanced Scientific Research, Indian Institute of Technology Guwahati, University of Burdwan

ORCID iD 0000-0002-0573-7074
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About

Research interests:

My research is focused on designing semiconductor nanocrystal solutions for optoelectronic and spintronic applications. I have recently defended my Ph.D. thesis with the title “Investigation of Photo-physics and sp-d Exchange Interaction in Perovskite Quantum Dots: Towards the Development of Novel Optoelectronic and Spintronic Materials.”
Over the last 5 years of my Ph.D., I worked on undoped and doped perovskite quantum dots (QDs) under the supervision of Prof. Ranjani Viswanatha at Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India. I have honed my skills and expertise in several areas. These include colloidal synthesis of perovskite QDs and cryogenic optical, electronic, and magnetic characterization. Additionally, I have gained valuable experience working with ultrahigh vacuum systems, fabricating solar cell devices, and utilizing various spectroscopic techniques.
Following completing a master’s degree in chemistry from the Indian Institute of Technology Guwahati, India, I successfully obtained a Ph.D. position at JNCASR. This opportunity was granted after undergoing a rigorous interview process, and I joined under the guidance of Prof. Ranjani Viswanatha. I secured my fellowship for the Ph.D. research by achieving an impressive all-India rank of 43 out of 5000 students in the national-level entrance examination.
During my Ph.D. under Prof. Viswanatha, I excelled in my first-year coursework, scoring 8 out of 8. Focused on perovskite QDs, I delved into their photo-physics, aiming to unravel fundamental properties and understand host-dopant coupling mechanisms. Our research involved colloidal synthesis methods for lead halide perovskite QDs, exploring growth mechanisms, absorption coefficients, and stability. We uncovered that perovskite QDs grow through self-assembly-driven oriented attachment, affecting dimensional growth and absorption coefficients based on bandgap, not size. Employing steady-state absorption, emission spectroscopy, X-ray diffraction, and imaging, we advanced conventional methods. To deepen our understanding, we utilized magnetic circular dichroism (MCD) spectroscopy and temperature-dependent gated photoluminescence (PL). Our findings highlighted the sp-d exchange interaction between Mn and the perovskite host, emphasizing energy transfer driven by temperature. Importantly, we discovered that Mn couples with the higher excited state of the conduction band, not band-edge states. Additionally, I explored dual doping (Mn/Sn or Fe/Mn) effects on the host-to-dopant energy transfer and electron back transfer, unveiling a phenomenon termed "Vibrationally Assisted Delayed Fluorescence (VADF)" in lead halide perovskites. This discovery indicated delayed fluorescence, paving the way for potential applications.

Scholarships and Awards:

• ACS Journal of Physical Chemistry Letter best poster presentation award at the PSIM-2023 conference (2023).
• All India Rank 153 in Graduate Aptitude Test Engineering (GATE) in Chemistry (2018).
• Joint five-year research fellowship and lifetime lectureship award (all India rank 71 in December 2017 & all India rank 43 in June 2017) by the Council of Scientific and Industrial Research (CSIR), India (2017).
• Sachidananda Memorial Prize for outstanding Physical and Inorganic Chemistry performance during B.Sc. (2016).
• Secured all India rank 203 in IIT-Joint admission for M.Sc. (JAM) Examination (2016).
• Selected for a five-year INSPIRE fellowship from the Ministry of Science and Technology, Govt. of India for outstanding performance in the 12th standard (2012).
• Selected for Merit Cum Means Scholarship for outstanding performance in 10th Standard (2010).
• Selected for National Means-Cum-Merit Scholarship (NMMS) (2008).

Technical Skills:
• UV-Vis Absorption Spectrometer
• (PL) Spectroscopy, along with Temperature-dependent PL spectroscopy, involves conducting lifetime measurements using a laser source -TCSPC and managing a Cryo-system capable of reaching temperatures as low as 10 K. Additionally, NIR-PL (Near-Infrared PL) and absolute quantum yield measurements are also explored.
• I have experience establishing Magnetic Circular Dichroism (MCD) Spectroscopy laboratory, where I worked with a magnetic field of 7 Tesla. Additionally, I am familiar with operating Ultra-high Vacuum and a cryo-system based on Helium, which can reach temperatures as low as 1.5K.
• XRD, TEM, ICP-OES, FT-IR, and EPR.
• X-ray absorption Fine Structure (XAFS) Spectroscopy of quantum dots for local structure analysis at P64, Petra III, DESY, Hamburg, Germany.
• Handling High Energy X-Ray Synchrotron Beamlines at P23, Petra III Hamburg, Germany (2D-XRD); and BL-18B KEK Tsukuba, Japan (Temperature-dependent XRD).
• Device fabrication based on perovskite solar cells and their characterization.
• Software: Microsoft Office, Origin, Image-J, Digital Micrograph, Ultra ChemDraw, Athena, Artemis, Dawn Diamond, Xpert HighScore, VESTA.

Employment

  • Lund University Post-doctoral Fellow
    2024 - Present
  • Jawaharlal Nehru Centre for Advanced Scientific Research Research Associate
    2023 - 2024
  • Lund University

Education

  • Jawaharlal Nehru Centre for Advanced Scientific Research Ph.D.
    2018 - 2023
  • Indian Institute of Technology Guwahati M.Sc. in Chemistry
    2016 - 2018
  • University of Burdwan B.Sc. in Chemistry
    2013 - 2016

Projects & Funding

Projects & funding information is unavailable.

Publications (10)