About Us
M.Tech (SSEM)
M.Tech (Photonics)
Indian Physics Association
Departmental Faculty Search Committee
Time Table
B Tech Engg Physics Lab content during lockdown
PhD Admission 2020 (online interview guidelines)
Monojit Bag
Monojit Bag Assistant Professor +91-1332-285551 Website
Areas of Interest
  • Organic Electronics, Organic Solar cells, Organic LEDs, FETs, sensors & detectors, Electrical & optical characterization.
  • Organic-inorganic hybrid materials, Perovskite solar cells, stability study, impedance spectroscopy, optical microscopy.
  • Intensity Modulated Photocurrent Spectroscopy, multi-layered device structure, polymer/electrolyte based device.
Professional Background
2016presentAssociate FacultyCentre of Nanotechnology, IIT Roorkee
2016presentAssistant ProfessorIIT Roorkee
20152016Postdoctoral FellowLund University
20122015Postdoctoral FellowUniversity of Massachusetts Amherst
20112012Research AssociateJawaharlal Nehru Centre for Advanced Scientific Research
Honors and Awards
Wenner Gren Postdoctoral Fellowship (selected)Lund University, Sweden2015
CSIR-UGC fellowshipCSIR-NET 2006
M.Sc. TopperPune University2006
Late Satish Bhide prize for best project in M.Sc.Pune University2006
Educational Details
B. E.ElectricalJadavpur University2003
M.Sc.PhysicsPune University2006
Ph.D.Material ScienceJawaharlal Nehru Centre for Advanced Scientific Research2011
Administrative Background
01/06/201630/05/2018DRC MemberIIT Roorkee, Dept. of Physics
1/5/2019presentDFSC member (Secretory)IIT Roorkee
01/06/2016PresentBTech (Engineering Physics) CoordinatorIIT Roorkee
14/5/2018presentCAC memberCenter of Nanotechnology, IIT Roorkee
Sponsored Research Projects
TopicFunding AgencyYear
Investigation of semiconductor/electrolyte interfaces by EIS and photo-transient measurementSERB-DST2017
Understanding Interfaces of organic electronic devices by Impedance Spectroscopy and IMPSIITR2016
Fabrication of large area (1 cm X 1 cm) uniform, pin hole free and highly efficient (upto 18%) stablDST-SERI2017
Design and Characterisation of Novel Perovskite Semiconductors for Understanding and Elimination ofDST-VR2020
  • American Chemical Society, USA, Member
  • Material Research Society, USA, Member
Teaching Engagements
TitleCourse CodeClass NameSemester
Electricity & MagnetismPHN-202Int. M.Sc. IISpring
MechanicsPHN-001B.Tech 1st YearAutumn
Technology of Nanostructured FabricationNTN-602M.Tech in NanotechnologyAutumn
Applied PhysicsPHN-004B.Tech 1st YearSpring
Physics of NanomaterialsNTN-604M.Tech in NanotechnologySpring
Solar PhotovoltaicPHN-708M.Tech (SSEM)Spring
OptoelectronicsPHN-712M.Tech (SSEM)Spring
Solid State LightingPHN-733M.Tech (Photonics)Spring
Digital Electronics & CircuitsPHN-209EPH-2nd YearAutumn
Numerical Analysis and Computational TechniquesPHN-701M.Tech in Photonics & SSEMAutumn
Applied InstrumentationPHN-310EPH+MSPSpring
Research Scholar Groups
Scholar NameInterest
Priya Srivastava (PhD)Photoelectrochemistry
Ramesh Kumar (PhD)Perovskite LEDs / EIS study
Jitendra Kumar (PhD)Perovskite LEDs/ Optical Characteriazation
Hemant Ronchia (PhD)Perovsktie Solar cells
Ankur Yadav (PhD)Perovsktie Solar cells
Deepak (PhD)Large area solar cells: Stability issues
Tanuj Kumar (PhD)Perovskite Materials
Arun Kumar (PhD)Perovskite Materials
PHDs Supervised
TopicScholar NameStatus of PHDRegistration Year
Polymer/electrolyte interfacePriya SrivastavaO2016
Opto-electronic properties of Perovskite materialsRamesh KumarO2017
Perovskite based LEDsJitendra KumarO2017
Photophysical study of perovskite solar cellsHemant RonchiaO2018
Charge transport characterization of Perovskite Solar CellsAnkur YadavO2018
Large area perovskite solar cellsDeepak (PhD)O2018
Photoelectrochemical water splittingArun KumarO2020
Photoelectrochemical water splittingTanuj KumarO2020
Understanding Charge and Ion Transport in Lead-Halide Perovskites by Electrochemical Impedance SpectroscopyBIT's 4th Annual World Congress of Smart MaterialsI2018
Role of ion migration on Perovskite stability: Electrochemical impedance and super-resolution micro spectroscopySERIIUS-IIT BombayT2016
Role of ion transport on the stability of perovskite solar cellsLund UniversityT2015
Organic and organic/inorganic hybrid electronics: A new generation solar cellsIISER Kolkata, IndiaI2015
From Molecules To Functional Materials: Controlling Morphology At Multiple Length-Scale6th Annual Young Investigator Meeting - Boston, USAT2014
Efficient charge transport through surfactant-stabilized polymer nano particles assemblyMRS Fall meeting, USAT2013
Transport Dynamics and Fluctuations in Active Bulk Heterojunction Polymer Solar CellsIISER Kolkata, IndiaT2011
General Features in Light Intensity Modulated Photocurrent Response of Bulk-heterojuction Polymer Solar cellsMRS Spring meeting, USAT2010
Universality in Intensity Modulated Photocurrent Spectroscopy in Bulk-Hetero-Junction Polymer Solar CellsJNCASR Annual In-House SymposiumT2009
Participation in short term courses
Couse NameSponsored ByDate
QIP on Relevance of Nanotechnology to the rechargeable battery technologyAICTE-QIP20/07/2016
Courses or Conferences Organised
Conference NameSponsored ByDate
QIP- on Application of Nanotechnologies in Energy SectorsAICTE-QIP24-06-2019
13th National Conference on Solid State IonicsBRNS+DST+CSIR16/12/2019
Special Lectures Delivered
An introduction to Solar photovoltaic technology: From Si to PerovskitesQIP centre, IIT Roorkee20/07/2016
Third Generation Solar Cells: Promises and ChallengesQIP Centre, IIT Roorkee16/07/2018
Polymer solar cell: Controlled morphology at nano-scale for large- scale printingQIP centre, IIT Roorkee25-06-2019
Perovskite solar cells, stability analysis and future perspectiveQIP centre, IIT Roorkee25-06-2019
Nanomaterials for Thermoelectric and Thermophotovoltaic ApplicationsQIP centre, IIT Roorkee26-06-2019
National International Collaboration
Hyper-spectral Imaging on Hybrid Perovskite MaterialsUniversity of Cambridge, Cavendish Laboratory, UK RP
Super Resolution Luminescence Micro-Spectroscopy of perovskite materialsChemical Physics Dept. Lund University, SwedenRP
Fabrication of Perovskite LEDsIIT Bombay, IndiaRP
Books Authored

Book Chapter:

 P. Srivastava, M. Bag"Ion Transport and Stability Issues in Organic-Inorganic Perovskite Materials." Revolution of Perovskite - Synthesis, Properties and Applications, Ed. N. Sabari Arul and V. Devaraj Nithya,  Singapore, Springer Nature Singapore Pte Ltd. 2020, 117-152.

Refereed Journal Papers

Total Citation: 1264

h-index 17. 

30.    Unveiling Morphology Effect on the Negative Capacitance and Large Ideality Factor in Perovskite Light Emitting Diodes, R. Kumar, J. Kumar, P. Srivastava, D. Moghe, D. Kabra*, Monojit Bag*, ACS Appl. Mater. Interfaces, 2020, xx(x), pp xxxx-xxxx.

29.     Elucidating Tuneable Ambipolar Charge Transport and Field Induced Bleaching at CH3NH3PbI3/Electrolyte Interface, Priya Srivastava, Monojit Bag*, Phys. Chem. Chem. Phys., 2020, 22, pp 11062-11074.

28.    Origin of Low Open Circuit Voltage in Surfactant-stabilized Organic Nanoparticle-based Solar Cells, T. S. Gehan, Christie L. C. Ellis, D. Venkataraman*, Monojit Bag*, ACS Appl. Mater. Interfaces, 2020, 12(7), pp 8183-8188.

27.    Temperature Assisted Nucleation and Growth to Optimize Perovskite Morphology at Liquid Interface: A Study by Electrochemical Impedance Spectroscopy, Priya Srivastava, Anukul Prasad Parhi, Rahul Ranjan, Soumitra Satapathi*, Monojit Bag*, ACS Appl. Energy Mater., 2018, 1(9), pp 4420-4425.

26.   Interplay Between Ion Transport, Applied Bias and Degradation Under Illumination in Hybrid Perovskite  p-i-n Devices, Emily C. Smith, Christie L. C. Ellis, H. Javaid, Lawrence A. Renna, Yao Liu, Thomas P. Russell, Monojit Bag*, D. Venkataraman,⁠ J. Phys. Chem. C, 2018, 122(25), pp 13986-13994.

25.   Evidence of tunable macroscopic polarization in perovskite films using photo-Kelvin Probe Force Microscopy, Lawrence A. Renna, Yao Liu, Thomas P. Russell, Monojit Bag, D. Venkataraman,⁠ Materials Letters, 2018, 217, pp 308-311.

24.   Controlling morphology of CH3NH3PbI3 perovskite film by dual solvent elimination method, Anubhav Raghav, Shivam Singh, Shailendra Kumar Sharma, Dinesh Kabra, Monojit Bag, Soumitra Satapathi, Nano-Structures & Nano-Objects, 2017, 4, pp 106-112.

23.   Mixed Ionic-Electronic Conduction in Binary Polymer Nanoparticle Assemblies, Lawrence A. Renna, Julia D. Lenef, Monojit Bag, D. Venkataraman, Adv. Mater. Interface, 2017, 4(20), pp 1700397.

22.   Role of Ionic Functional Groups on Ion Transport at Perovskite Interfaces, Yao Liu, Lawrence A. Renna, Hilary B. Thompson, Zachariah A. Page, Todd Emrick, Michael D. Barnes, Monojit Bag, D. Venkataraman, and Thomas P. Russell, Adv. Energ. Mater., 2017, 7(21), pp 1701235.


2012-2016 (Post-doctoral work)

21.   Indoor Light Recycling: A New Home for Organic Photovoltaics, Christie L. Cutting, Monojit Bag and D. Venkataraman, J. Mater. Chem. C, 2016, 4(43), pp 10367-10370.

20.    Evidence for Reduced Charge Recombination in Carbon Nanotube/Perovskite-based Active Layers, Monojit Bag, Lawrence A. Renna, Seung Pyo Jeong, Xu Han, Christie L. Cutting, Dimitrios Maroudas, and D. Venkataraman, Chem. Phys. Lett., 2016, 662, pp 35-41.

19.    Super-resolution luminescence micro-spectroscopy reveals mechanism of photo-induced degradation in CH3NH3PbI3 perovskite nano-crystals. Aboma Merdasa, Monojit Bag, Yuxi Tian, and Ivan Scheblykin, J. Phys. Chem. C, 2016, 120(19), pp 10711-10719.

18.     High Efficiency Tandem Thin-Perovskite/Polymer Solar Cell with Graded recombination Layer. Yao Liu, Lawrence A. Renna, Monojit Bag, Zachariah A. Page, Paul Kim, Jaewon Choi, Todd Emrick, D. Venkataraman, & Thomas P. Russell, ACS Appl. Mater. Interfaces, 2016, 8(11), pp 7070-7076.

17.    Tunable Percolation in Semiconducting Binary Polymer Nanoparticle Glasses, L. A. Renna, M. Bag, T. S. Gehan, X, Han, P. M. Lahti, D. Maroudas and D. Venkataraman,  J. Phys. Chem. B, 2016, 120(9), pp 2544-2556.

16.    Rapid Combinatorial Screening of Inkjet-printed Alkyl-ammonium Cations in Perovskite Solar Cells. Monojit Bag, Ziwen Jiang, Lawrance A. Renna, Seung Pyo Jeong, Vincent M. Rotello and Dhandapani Venkataraman, Mater. Lett. 2016, 164(1), pp 472-475.  

15.    Self-healing polymer sealant for encapsulating flexible solar cells. M. Bag, S. Banerjee, R. Faust and D. Venkataraman, Sol. Energ. Mater. Sol. Cells, 2016, 145(3), pp 418-422.  

14.    Understanding Interface Engineering for High-Performance Fullerene/Perovskite Planar Heterojunction Solar Cells. Yao Liu, M. Bag (equal contribution), Lawrence A. Renna, Zachariah A. Page, Paul Kim, Todd Emrick, D Venkataraman and T. P. Russell. Adv. Energ. Mater. 2016, 6(2), pp 1501606.

13.    Analysis of Organic Photovoltaic Device Performance with Active Layer Morphologies of Self-assembled Nanospheres. X. Han, M. Bag, T. S. Gehan, D. Venkataraman, and D. Maroudas, J. Phys. Chem. C, 2015, 119(46), pp 25826-25839. 

12.    Kinetics of Ion Transport in Perovskite Active Layers and its Implications for Active Layer Stability. M. Bag, L. A. Renna, R. Adhikari, S. Karak, F. Liu, P. M. Lahti, T. P. Russell, M. T. Tuominen and D. Venkataraman, J. Am. Chem. Soc. 2015, 137(40), pp 13130-13137. 

11.    Fabrication Conditions for Efficient Organic Photovoltaic Cells from Aqueous Dispersions of Nanoparticles. M. Bag, T. S. Gehan, L. A. Renna D. D. Algaier, P. M. Lahti and D. Venkataraman, RSC Advances, 2014, 4, pp 45325-45331. 

10.    Multiscale Active Layer Morphologies for Organic Photovoltaics Through Self-Assembly of Nanospheres. T. S. Gehan, M. Bag (equal contribution), L. A. Renna, X. Shen, D. D. Algaier, P. M. Lahti, T. P. Russell and D. Venkataraman,  Nano Lett., 2014, 14(9), pp 5238-5243. 

9.    Analysis of Hole Transport in Thin Films and Nanoparticle Assemblies of Poly(3-hexylthiophene). X. Han, M. Bag, T. S. Gehan, D. Venkataraman, and D. Maroudas, Chem. Phys. Lett., 2014, 610-611, pp 273-277. 

8.    Efficient charge transport in assemblies of surfactant-stabilized semiconducting nanoparticles. M. Bag, T. S. Gehan, D. D. Algaier, F. Liu, G.Nagarjuna, P. M. Lahti, T. P. Russell, and D. Venkataraman,  Adv. Mater., 2013, 25, pp 6411.   


2006-2012 (Ph.D. work)

7.    Fluctuations in photocurrent of bulk heterojunction polymer solar cells-A valuable tool to understand microscopic and degradation processes. M. Bag, N. S. Vidhyadhiraja and K. S. Narayan,  Appl. Phys. Lett., 2012 101, pp 043903. 

6.    Single-Pixel, Single-Layer Polymer Device as a Tricolor  Sensor with Signal Mimicking Natural Photoreceptors, Vini Gautam, Monojit Bag and K. S. Narayan, J. Am. Chem. Soc. 2011, 133(44), pp 17942-17949. 

5.    Dynamics of Polymer Bulk-Heterostructure-Electrolyte devices. Vini Gautam, Monojit Bag and K. S. Narayan, J. Phys. Chem. Lett., 2010, 1(22), pp 3277–3282. 

4.    Universality in Intensity Modulated Photocurrent in Bulk-Heterojunction Polymer Solar Cells. M. Bag, K. S. Narayan, Phys. Rev. B, 2010, 82, pp 075308. 

3.    Deformation of metallic liquid drop by electric field for contacts in molecular - organic electronics. M. Bag, D. Gupta, N. Arun and K. S. Narayan, Proc. R. Soc. A, 2009, 465, pp 1799-1808. 

2.    Area dependent efficiency of organic solar cells. D. Gupta, M. Bag and K. S. Narayan, Appl. Phys. Lett. 2008, 93, pp 163301. 

1.    Correlating reduced fill-factor in polymer solar cells to contact effects. D. Gupta, M. Bag and K. S. Narayan, Appl. Phys. Lett. 2008, 92, pp 093301. 



  1. Artificial Retina Device, K. S. Narayan, V. Gautam, M. BagUS 9037251 B2
  2. Artificial Retina Device, K. S. Narayan, V. Gautam, M. BagUS 9322713 B2
  3. Organic Photovoltaic Devices and Methods Thereof, Dhandapani Venkataraman, Monojit Bag, Timothy S. Gehan. Christie Laurel Cutting. International Publication No.: US 20170179391 A1