Organic Electronics

Organic Electronics

Organic Electronics covers a number of research areas in materials science and engineering, including design of (i) thin film organic solar cells for optimal photovoltaic performance, (ii) organic light emitting devices with optimal light emission and (iii) inorganic scintillators with optimal energy resolution for applications in nuclear medical imaging and excitonic and photonic processes in materials, including crystals, non-crystalline materials and nanostructures (quantum wells, wires and dots). In addition, a number of Masters students in the field of Electrical and Electronics Engineering are engaged each year to work on their thesis projects each semester. Research Projects are available for Ph.D., Masters by Research, Masters thesis projects and undergraduate fourth year thesis projects in the following areas.

Design and fabrication of thin film organic solar cells for optimal photovoltaic performance

There are four key processes which control the performance of bulk hetro-junction organic solar cells (OSCs): 1) absorption of photons leading to creation of excitons, 2) transport of excitons to the donor (D) – acceptor (A) interface, 3) formation of charge transfer excitons at the interface and its dissociation and 4) collection of  dissociated free electrons and holes to the cathode and anode electrodes, respectively, to produce current. The research activities on designing involve optimisation of all the four processes leading to the optimized power conversion efficiency of OSCs.  The optimal designs thus achieved can be used to fabricate OSCs in the laboratory and test their performance.

Research Coordinators: Prof Jai Singh and Dr Narayan

Design and fabrication of organic light emitting devices (OLEDs) for optimal light emission

The injected charge carriers in the organic active layer sandwiched between the two electrodes for excitons in two different spin configurations; singlet and triplet. Statistically the probability of forming singlet and triplet excitons may be found to be in the ratio of one to three (1:3). The radiative recombination of singlet excitons is spin allowed but that of triplet excitons is spin forbidden and hence the emission can occur only through singlets leading to an emission efficiency of 25%. Thus,  capturing the emission from triplet excitons becomes attractive  but challenging. We have invented a new exciton-spin-orbit-photon interaction operator which can flip the triplet spin to singlet configuration enabling the emission from triplet excitons. 
Optimization of light emission from organic light emitting devices is studied in this project and optimal designs thus achieved may be used to fabricate some OLEDs and test them.

Research Coordinator: Prof Jai Singh

Designing  inorganic scintillators with optimal energy resolutions for applications in nuclear medical imaging

Existing scintillators suffer from nonlinearity that reduces their energy resolution leading to inaccurate diagnosis and assessment of staging of diseases like cancers, tumours, Alzheimer’s, etc.  We have successfully explained the cause of nonlinearilty in scintillatos. Further theoretical methods will be developed to reduce/rectify the nonlinearity problem.

Research Coordinator: Prof Jai Singh

Excitonic and Photonic Processes in Materials

This project deals with the dynamics of excitons in semiconductors, including bulk crystalline, non-crystalline and nan-structures. The project is suitable for Ph.D. candidates interested in condensed matter theory with applications in quantum dot lasers and hybrid of nanostructures.

Research Coordinator: Prof Jai Singh