Lecturer in Engineering Science

Krishanu Dey

  • I am a Postdoctoral Research Associate in the Department of Chemical Engineering at Imperial College London (since March 2023).
  • Prior to starting my appointment at Imperial, I was a postdoctoral researcher in the Department of Physics at the University of Oxford and I currently maintain a long-term visitor status there.
  • My research focuses on emerging semiconductor materials for (opto)electronic and photoelectrochemical applications.
  • I completed my PhD in Physics from the Cavendish Laboratory at the University of Cambridge and M.Eng in Electrical and Computer Engineering from the National University of Singapore.
  • I have received several prestigious awards in recent years, including a ‘Junior Research Fellowship’ at Worcester College Oxford, the ‘RSC Energy Sector Best PhD Thesis Award 2023’, ‘IET Hudswell International Research Award 2022’ and ‘E-MRS Graduate Student Award 2021’.
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Teaching

As a Stipendiary Lecturer in Engineering Science since October 2024, I offer tutorials for a range of courses for the first-year and second-year undergraduate students at Trinity, including mathematics (P1, A1), Electrical Engineering (P2) and Energy Systems (A4). In the Department of Engineering Science, I have also been acting as the Lead Tutor for the third-year course on electronic devices (B12) since 2023. 

Research

The development of highly efficient single junction and multijunction photovoltaics, coupled with the rise of bright and efficient LEDs with high fidelity and a wide color gamut, has placed halide perovskite materials at the centrestage of next generation technologies aimed towards combating climate change and promoting sustainability. During my PhD at Cambridge, I investigated the intriguing optoelectronic properties of solution-processed mixed lead-tin halide perovskites using a combination of fundamental spectroscopic investigation and applied device integration in solar cells and transistors. At Oxford, my postdoctoral research primarily focused on developing thermally evaporated perovskite thin films and heterostructures for high-performance light emitting diodes. Taking a pivot, my current work at Imperial is centred on developing and understanding the mechanistic insights of earth-abundant photocatalysts and photoelectrodes for solar-driven production of essential fuels and chemicals.

Beyond research, I am an active contributor to the scientific community. I have so far delivered 13 ORAL presentations in leading international conferences and has served as the Lead Organizer for 3 international symposia in MATSUS conferences (Fall 2024, Spring 2025 and Fall 2025). Besides these, I have already raised ~ £150k in research grants (as PI/co-PI/Researcher Co-I) and ~ £190k in personal funding through scholarships and travel grants). I have also supervised 7 master’s and undergraduate research projects at Oxford and established multiple international collaborations, reflecting my commitment to both research leadership and mentorship.

Find more about me at:

https://www.physics.ox.ac.uk/our-people/deyk 

https://profiles.imperial.ac.uk/k.dey 

Selected Publications

* denotes equal contribution; ^ denotes corresponding author

  1. Sharma, B.; Dey, K.^; Afroz, M.A.; Snaith, H.J.; Satapathi, S.^ Functional Additive Incorporation Enhances the Performance of Semi-Transparent Perovskite Solar Cells, ACS Energy Lett. 2025, 10, 5265-5272. 
  2. Roose, B.^; Dey, K.; Fitzsimmons, M.R.; Chiang, Y.-H.; Cameron, P.J.; Stranks, S.D.^ Electrochemical Impedance Spectroscopy of All-Perovskite Tandem Solar Cells, ACS Energy Lett. 2024, 9, 2, 442-453. https://doi.org/10.1021/acsenergylett.3c02018
  3. Dey, K.; Ghosh, D.; Pilot, M.; Pering, S.R.; Roose, B.; Deswal, P.; Senanayak, S.P.; Cameron, P.J.^; Islam, M.S.^; Stranks, S.D.^ Substitution of Lead with Tin Suppresses Ionic Transport in Halide Perovskite Optoelectronics, Energy Environ. Sci. 2024, 17, 760-769. https://doi.org/10.1039/D3EE03772J
  4. Senanayak, S.P.*; Dey, K.*; Shivanna, R.; Li, W.; Ghosh, D.; Zhang, Y.; Roose, B.; Zelewski, S.J.; Andaji-Garmaroudi, Z.; Wood, W.; Tiwale, N.; MacManus-Driscoll, J.L.; Friend, R.H.; Stranks, S.D.^; Sirringhaus, H.^ Charge Transport in Mixed Metal Halide Perovskite Semiconductors, Nat. Mater. 2023, 22, 216-224. https://doi.org/10.1038/s41563-022-01448-2 
  5. Adeyemo, S. O.; Dey, K.; Stranks, S.D.; Joyce, H.J.^ Impact of the Addition of Tin on the Charge Carrier Dynamics of Metal Halide Perovskites, 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). https://doi.org/10.1109/IRMMW-THz50927.2022.9895582
  6. Dey, K.; Roose, B.; Stranks, S.D.^ Optoelectronic Properties of Low-Bandgap Halide Perovskites for Solar Cell Applications, Adv. Mater. 2021, 33, 2102300. https://doi.org/10.1002/adma.202102300
  7. Roose, B.^; Dey, K.; Chiang, Y.-H.; Friend, R.H.; Stranks, S.D.^ Critical Assessment of the Use of Excess Lead Iodide in Lead Halide Perovskite Solar Cells, J. Phys. Chem. Lett. 2020, 11, 6505-6512. https://doi.org/10.1021/acs.jpclett.0c01820
  8. Dey, K.; Aberle, A.G.; Eek, S.V.; Venkataraj, S.^ Superior Optoelectrical Properties of Magnetron Sputter-Deposited Cerium-Doped Indium Oxide Thin Films for Solar Cell Applications, Ceram. Int. 2021, 47, 1798-1806. https://doi.org/10.1016/j.ceramint.2020.09.006 
  9. Dey, K.; Lenka, T.R.^ Simulation of High Efficiency InGaP/InP Tandem Solar Cells under Flat Plate and Concentrator Conditions, 2017 IEEE International Conference on Microelectronic Devices, Circuits and Systems (ICMDCS). https://doi.org/10.1109/ICMDCS.2017.8211717

 

Recent Publication

Substitution of lead with tin suppresses ionic transport in halide perovskite optoelectronics

Subjects
Engineering Science
Dr Dey
krishanu.dey@physics.ox.ac.uk

Substitution of lead with tin suppresses ionic transport in halide perovskite optoelectronics