News & Highlights

02/02/24 Shout out to Sanchari Debnath for Ph.D. thesis colloquium  on “Dissipative Mechanisms in Organic Light-emitting Diodes: Role of Intramolecular Charge Transfer and Delayed Fluorescence”.

We are excited to share our recent findings on the application of photostable Diketopyrrolopyrrole dye and its derivatives for Non-Aqueous Redox Flow Batteries. Click here to read more about it.

Satish Patil
Professor and Chair
Solid State and Structural Chemistry Unit
Indian Institute of Science, Bangalore (India)
E-mail :

Tel. 080-22932651, Fax: +91 80 23601310

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Research Areas:

Our group’s research primarily focused on investigating various aspects of molecular electronics, encompassing organic photovoltaics, light-emitting diodes, and field-effect transistors. We adopt an interdisciplinary approach that involves synthesizing multifunctional conjugated polymers and oligomers possessing unique properties. Working at the intersection of chemistry, physics, and materials engineering, we explore the characteristics of these materials. Leveraging molecular structures, we employ molecular design and robust synthetic strategies to finely adjust and optimize the desired properties.

Our research group is currently dedicated to the development of π-conjugated polymers and oligomers for various applications, including:

Organic/Perovskite Solar Cells: We are actively engaged in the synthesis of π-conjugated materials with optimized energy levels, strong light absorption, and efficient charge transport properties. Our aim is to enhance the performance and stability of organic and perovskite solar cells.

Singlet Fission: Our focus lies in exploring the potential polymers and oligomers for singlet fission, a process that converts one photon into two excitons. By designing materials that exhibit efficient singlet fission, we aim to improve the efficiency of solar energy conversion and enable the utilization of high-energy photons.

Electrochemical Energy Storage Devices: Our research involves the design and synthesis of π-conjugated materials for electrochemical energy storage devices, such as batteries and supercapacitors. We aim to develop materials with high charge storage capacity, excellent stability, and rapid charge/discharge rates to enhance the performance and longevity of energy storage systems.

Organic Light-emitting Diodes (OLEDs): We are actively working on the development of π-conjugated materials with efficient electroluminescent properties for OLED applications. Our efforts are focused on improving device efficiency, color purity, and stability by optimizing the molecular structures and energy levels of the materials.

Thermally Activated Delayed Fluorescence (TADF): Our investigations revolve around utilizing conjugated materials with thermally activated delayed fluorescence in display technologies and efficient lighting. Through the design of materials that exhibit efficient TADF, we aim to achieve high-efficiency emission by effectively utilizing both singlet and triplet excitons.

Field-Effect Transistors: Our research includes the development of materials for field-effect transistors (FETs). We strive to design materials with high charge carrier mobility, low operating voltages, and exceptional stability to enable the fabrication of high-performance FET devices for applications in flexible electronics and integrated circuits.

Through our work in these diverse areas, we aim to advance the field of molecular electronics and contribute to the development of efficient and sustainable electronic devices for energy conversion and information processing.

Representative Publications:
  1.  Kim, W.; Panjwani, N. A.; Krishnapriya, K.C.; Majumder, K; Dasgupta J., Bittl, R.; Patil, S.; Musser, A. J. Heterogeneous Singlet Fission in a Covalently Linked Pentacene Dimer. arXiv preprint arXiv:2304.05432.
  2.  Mohapatra, A. A.; Pranav, M.; Yadav, S.; Gangadharappa, C.; Wu, J.; Labanti, C.; Wolansky, J.; Benduhn, J.; Kim, J.-S.; Durrant, J.; and Patil, S. Interface Engineering in Perylene Diimide-Based Organic Photovoltaics with Enhanced Photovoltage. ACS Applied Materials & Interfaces (2023)
  3. Giri, D.; Saha, S. K.; Siemons, N.; Anderson, I.; Yu, H.; Nelson, J.; Canjeevaram Balasubramanyam, R. K.; Patil, S. Ion size-dependent electrochromism in air-stable napthalenediimide-based conjugated polymers. ACS Appl. Mater. Interfaces. 15, 17767−17778 (2023).
  4.  Aithal, A.; Samuel, J. J.; Bandyopadhyay, A.; Karrothu, V. K.; Gangadharappa, C.; Patil, S.; Narayan, A.; Aetukuri, N. P. B. Extended conjugation acceptors increase specific energy densities in π-conjugated redox polymers. J. Phys. Chem. C. 127, 5238–5245 (2023).
  5. Samuel, J. J.; Garudapalli, A.; Gangadharappa, C.; Mahapatra, S. R.; Patil, S.; Aetukuri, N. P. B. Charge polarity-dependent ion-insertion asymmetry during electrochemical doping of an ambipolar π-conjugated polymer. Nat. Commun. 13, 7788 (2022)
  6. Maity, N., Kim, W., Panjwani, N.A. et al. Parallel triplet formation pathways in a singlet fission material. Nat Commun 13, 5244 (2022).
  7.  Mohapatra, A. A.; Tiwari, V.; Patil, S. Energy Transfer in Ternary Blend Organic Solar Cells: Recent Insights and Future Directions. Energy Environ. Sci. 2021, 14 (1), 302–319. DOI: 10.1039/d0ee03170d.
  8.  Krishnapriya, K. C.; Roy, P.; Puttaraju, B.; Salzner, U.; Musser, A. J.; Jain, M.; Dasgupta, J.; Patil, S. Spin Density Encodes Intramolecular Singlet Exciton Fission in Pentacene Dimers. Nat. Commun. 2019 101 2019, 10 (1), 1–8. DOI: 10.1038/s41467-018-07736-3.
  9. Krishnapriya, K. C.; Musser, A. J.; Patil, S. Molecular Design Strategies for Efficient Intramolecular Singlet Exciton Fission. ACS Energy Lett. 2018, 4 (1), 192–202. DOI: 10.1021/acsenergylett.8b01833.
  10. Zang, Y.; Ray, S.; Fung, E. D.; Borges, A.; Garner, M. H.; Steigerwald, M. L.; Solomon, G. C.; Patil, S.; Venkataraman, L. Resonant Transport in Single Diketopyrrolopyrrole Junctions. J. Am. Chem. Soc. 2018, 140 (41), 13167–13170. DOI: 10.1021/jacs.8b06964.
  11. Mukhopadhyay, T.; Musser, A. J.; Puttaraju, B.; Dhar, J.; Friend, R. H.; Patil, S. Is the Chemical Strategy for Imbuing “Polyene” Character in Diketopyrrolopyrrole-Based Chromophores Sufficient for Singlet Fission? J. Phys. Chem. Lett. 2017, 8 (5), 984–991. DOI: 10.1021/acs.jpclett.6b02919.
  12. Roy, P.; Jha, A.; Yasarapudi, V. B.; Ram, T.; Puttaraju, B.; Patil, S.; Dasgupta, J. Ultrafast Bridge Planarization in Donor-π-Acceptor Copolymers Drives Intramolecular Charge Transfer. Nat. Commun. 2017 81 2017, 8 (1), 1–10. DOI: 10.1038/s41467-017-01928-z.
  13. Senanayak, S. P.; Ashar, A. Z.; Kanimozhi, C.; Patil, S.; Narayan, K. S. Room-Temperature Bandlike Transport and Hall Effect in a High-Mobility Ambipolar Polymer, Phys. Rev. B 2015, 91 (11), 115302 (1-16). DOI: 10.1103/physrevb.91.115302.
  14. Kanimozhi, C.; Yaacobi-Gross, N.; Chou, K. W.; Amassian, A.; Anthopoulos, T. D.; Patil, S., Diketopyrrolopyrrole-Diketopyrrolopyrrole-Based Conjugated Copolymer for High- Mobility Organic Field-Effect Transistors. J. Am. Chem. Soc. 2012, 134, 16532-16535. DOI: 10.1021/ja308211n.
  15. Naik, M. A.; Venkatramaiah, N.; Kanimozhi, C.; Patil, S., Influence of Side-Chain on Structural Order and Photophysical Properties in Thiophene Based Diketopyrrolopyrroles: A Systematic  Study. J. Phys. Chem. C 2012, 116, 26128-26137. DOI: 10.1021/jp306365q.
  16. Mohapatra, A. A.; Rational design of Donor-Acceptor based Semiconducting Copolymers with High Dielectric Constant, J. Phys. Chem. C 2021, 125, 68866896. DOI: 10.1021/acs.jpcc.1c00340