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Cavendish Laboratory, Cambridge


My work is largely focused on solving problems related to lack of access to clean and sustainable energy, through scientific and entrepreneurial advances in solar energy conversion technologies. I am currently working on improving solar cell efficiencies beyond the Shockley-Queisser limit through manipulation of incoming solar spectra ( by down-converting blue and UV light into red light and up-converting residual infrared light that isn't absorbed by the solar cell)

Broadly the themes I am working/ have worked on are:

  • The role of entropy in excitonic processes such as singlet fission
  • Solar Energy Conversion Devices
  • Hybrid, Organic and Tandem Solar Cells
  • Spectroscopy (Time Resolved and Steady State)
  • Singlet Exciton Fission
  • Fabrication (and Characterization) of Nano Films and Nano Structures
  • Prototyping instruments for nano fabrication and characterizations
  • Energy Efficient Buildings

I am working/ have recently worked on the following projects:

  • Optimizing Singlet Fission in TIPS-Tetracene Films and Blends for Down-Conversion of Light
  • Studying Entropy Driven Charge Separation in Pc/C60 Thin Films
  • Design and Prototype of Universal Nanofabrication Device


Key publications: 

Research Papers And Articles

1. Sawhney, Nipun, Anubhav Raghav, and Soumitra Satapathi. "Utilization of Naturally Occurring Dyes as Sensitizers in Dye Sensitized Solar Cells." IEEE Journal of Photovoltaics 7.2 (2017): 539-544.

2. Chaudhri, N., Sawhney, N., Madhusudhan, B., Raghav, A., Sankar, M., & Satapathi, S. Effect of functional groups on sensitization of dye-sensitized solar cells (DSSCs) using free base porphyrins. Journal of Porphyrins and Phthalocyanines21.03 (2017), 222-230.

3. Using Indian summer fruit jamun to make solar cells. Nature India, 13 April 2017. 

4. Alvertis, Antonios M., Raj Pandya, Loreta A. Muscarella, Nipun Sawhney, Malgorzata Nguyen, Bruno Ehrler, Akshay Rao, Richard H. Friend, Alex W. Chin, and Bartomeu Monserrat. "Impact of exciton delocalization on exciton-vibration interactions in organic semiconductors." Physical Review B 102, no. 8 (2020): 081122.

Patents and Inventions

1. Sawhney, Nipun, Purnendu Mishra and Soumitra Satapathi. Device and Method for Real Time Parameter Controlled Spin Coating. E-106/43/2016/DEL/201611039173 (Provisionally Patent)
Currently being patented for commercialisation

2. Sawhney, Nipun, and Soumitra Satapathi. Tandem Solar Energy Convertor Using Selective Waveband Concentration. Patent Pending.

3. Sawhney, Nipun and Advait Patil. Concentrator Photovoltaic Based on Macroscopic Light Trapping.Patent Pending

Conference Presentations

1. N. Sawhney, A. Thampi, J. Allardice, R. Chen, A. Rao. "Optimising Singlet Fission Dynamics and Phase in TIPS-Tetracene Films for Down-conversion of Light". Gordon Research Conference, 20-27 July 2018, Barga, Italy

2. N. Sawhney, A. Thampi, J. Allardice, R. Chen, A. Rao. “Singlet Fission Dynamics And Phase Change in TIPS Tetracene Films” International Symposium on Photon Fusion and Singlet Fission, 16-19 April 2018, Gothenburg, Sweden

3. N. Sawhney, P. Mishra and S. Satapathi. “Spin Coating With Real Time Parameter Control” Nanobioteck-2016, 24-26 Nov. 2016, New Delhi, India

4. N. Chaudhri, N. Sawhney, et al. “Effect of Functional Groups on Sensitization of Dye Sensitized Solar Cells Using Free Base Porphyrins” Poster Presented at: International Conference for Advanced Materials-2016, 4-7 Mar. 2016, Roorkee, India

Teaching and Supervisions


I used to demonstrate a few basic physics experiments for undergraduates in the undergraduate laboratory course titled Physics 1A

Ph.D. Student
 Nipun  Sawhney

Contact Details


Person keywords: 
Optical spectroscopy
Hybrid Nanomaterials,