Priya presented an ePoster at 12th International Conference on Hybrid and Organic Photovoltaics
May 26-29, 2020

This poster contains latest research on Charge Transfer and Charge Separation State Kinetics Leading to Field-induced Bleaching at Methylammonium Lead Tri-iodide Perovskite-electrolyte Interface

Priya and Jitendra presented their posters at NCSSI-13


Image captured by Jitendra

Instrument used- Nikon, fluorescence microscope
Model- LV 100

SEM Image of Perovskite Micro-crystals

Micrometer sized cubic crystals on substrate, film prepared by Ramesh

Instrument manufacturer- FEI Netherlands

Mysterious Fist

Picture captured by Jitendra

Instrument Used- Nikon fluorescence microscope
LV - 100

Welcome to our Advanced Research in Electrochemical Impedance Spectroscopy Laboratory: AREIS

M. Bag's Group at IIT Roorkee...


We are mainly working on inorganic-organic hybrid perovskite materials; towards improving the efficiencies of perovskite LEDs and perovskite solar cells.

    Zahner impedance spectroscopy setup is used to study the energetics at various interfaces, understanding the band structure of materials.

    Our purpose is to achive balanced charge injection and reduced leackage current at the interface. Our group is working towards the optimization of morphology of thin films prepared by solution processed coating technique.

Any noise could be unwanted for common people but is important for us to understand optoelectronics devices. Like any other spectroscopic technique, Noise spectroscopy can unfold significant insight about charge transport properties in the devices. Along with Electrochemical Impedance Spectroscopy (EIS) and Intensity Modulated Photocurrent/Photovoltage Spectroscopy (IMPS/IMVS), our group focus on the Noise spectroscopy as alternative tool to understand charge carrier dynamics in various optoelectronics devices.

Demonstration of fully printable vacuum free metal deposition based perovskite LED

Latest News


FEB 10,

Applications are invited from M.Sc, M.Tech or with equivalent degree to work on DST project for a period of one year (extended upto 2 years). GATE or NET qualification is required. The project is for designing and characterization of hybrid perovskitc materials for light emitting diode and solar cell applications. The selected candidate may get an opportunity for the PhD admission. Interested students can apply directly to with their latest CV before 20th February, 2021.


DEC 29,

In this work, we have demonstrated that the ionic conductivity in perovskite/electrolyte based device depends on the interpaly between A-site cations and X-site halide ions. JPL behavior is observed at low-frequency to mid-frequency regime in the PEIS measurement while high frequency ac conductivity is frequency-indenpendent.


NOV 15,

In this work, we have demonstrated that the composition of perovskite materials plays a significant role in controlling the electrical and ionic properties in mixed cation mixed halide (MCMH) perovskite-based devices. The most exciting finding is that the low frequency ionic conductivity follows opposite behavior for two MCMH devices due to the interplay between A-site cation and X-site halide ion.


NOV 03, 2020

Our latest work explains the features of perovskite film morphology based on Stranski Krastanov Growth. In this publication, we have provided a clear picture of the growth mechanism of textured patterns, and by using a series of fluorescence measurements, we found that the nanostructured micro-islands exhibited superior emission and large quasi-Fermi level splitting.

July 1, 2020

We have demonstrated the Negative capacitance in PeLEDs for the first time, that depends on morphology. Hope it will show a new way to rethink device physics.

May 1, 2020

In this article we have investigated charge transport through a perovskite/electrolyte interface using electrochemical impedance spectroscopy (EIS) under illumination and applied bias conditions. Our results indicate ambipolar charge transport through the perovskite layer and field induced bleaching at the CH3NH3PbI3/electrolyte interface.

January 30, 2020

In this article we have investigated origin of voltage loss and charge trapping in surfactant stabilized nanoparticle based devices. This article is published in ACS Applied Materials and Interfaces.

January 03, 2020

Happy to share our first book chapter Chapter No.5 : Ion Transport and Stability Issues in Organic–Inorganic Perovskite Materials in the book Revolution of Perovskites: Synthesis, Properties and Application by Springer Publication.