Monojit Bag - Department of Physics,Indian Institute of Technology Roorkee
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
2016-01-11OngoingAssistant ProfessorIIT Roorkee
2015-07-015 months 30 daysPostdoctoral FellowLund University
2012-02-013 years 3 months 30 daysPostdoctoral FellowUniversity of Massachusetts Amherst
2011-08-015 months 30 daysResearch AssociateJawaharlal Nehru Centre for Advanced Scientific Research
Multiple Posts
2016-06-011 year 11 months 30 daysDRC MemberIIT Roorkee, Dept. of Physics
2019-06-0110 months DFSC member (Secretory)IIT Roorkee
2016-08-01OngoingAssociate FacultyCentre of Nanotechnology, IIT Roorkee
2020-10-01OngoingCRC SecretoryCenter of of Nanotechnology, IIT Roorkee
2016-06-014 years BTech (Engineering Physics) CoordinatorIIT Roorkee
2018-01-01OngoingCAC memberCenter of Nanotechnology, IIT Roorkee
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
Sponsored Research Projects
TopicFunding AgencyStart DatePeriod
Investigation of semiconductor/electrolyte interfaces by EIS and photo-transient measurementSERB-DST2017-033 years
Understanding Interfaces of organic electronic devices by Impedance Spectroscopy and IMPSIITR2016-072 years 11 months
Fabrication of large area (1 cm X 1 cm) uniform, pin hole free and highly efficient (upto 18%) stablDST-SERI2017-07Ongoing
Design and Characterisation of Novel Perovskite Semiconductors for Understanding and Elimination ofDST-VR2020-12-14Ongoing
  • American Chemical Society, USA, Member
  • Material Research Society, USA, Member
Teaching Engagements
TitleCourse CodeClass NameSemester
Electricity & MagnetismPHN-202Int. M.Sc. IISpring
Electrodynamics and OpticsPHN-005CSE+ECEAutumn
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
Ankur Yadav (PhD)Perovsktie Solar cells
Hemant Ronchia (PhD)Perovsktie Solar cells
Deepak (PhD)Large area solar cells: Stability issues
Tanuj Kumar (PhD)Perovskite Materials
Arun Kumar (PhD)Perovskite Materials
Farha Naaz MansooriePerovskite FET
PHDs Supervised
TopicScholar NameStatus of PHDRegistration Date
Polymer/electrolyte interfacePriya SrivastavaO2016-07
Opto-electronic properties of Perovskite materialsRamesh KumarO2017-07
Perovskite based LEDsJitendra KumarO2017-07
Photophysical study of perovskite solar cellsHemant RonchiaO2018-12
Charge transport characterization of Perovskite Solar CellsAnkur YadavO2018-12
Large area perovskite solar cellsDeepak (PhD)O2018-12
Photoelectrochemical water splittingArun KumarO2019-12
Photoelectrochemical water splittingTanuj KumarO2019-12
Perovskite based field effect transistorFarha Naaz MansoorieO2020-08
Understanding Charge and Ion Transport in Lead-Halide Perovskites by Electrochemical Impedance SpectroscopyBIT's 4th Annual World Congress of Smart Materials2018-01
Inorganic organic hybrid perovskite materials as photoelectrochemical cell for water splitting application: Promises and challengesConference on Catalysis and Photocatalysis for Clean Energy (CPCE2020), NIT Jamshedpur2020-10
Role of ion migration on Perovskite stability: Electrochemical impedance and super-resolution micro spectroscopySERIIUS-IIT Bombay2016-01
Role of ion transport on the stability of perovskite solar cellsLund University2015-01
Organic and organic/inorganic hybrid electronics: A new generation solar cellsIISER Kolkata, India2015-01
From Molecules To Functional Materials: Controlling Morphology At Multiple Length-Scale6th Annual Young Investigator Meeting - Boston, USA2014-01
Efficient charge transport through surfactant-stabilized polymer nano particles assemblyMRS Fall meeting, USA2013-01
Transport Dynamics and Fluctuations in Active Bulk Heterojunction Polymer Solar CellsIISER Kolkata, India2011-01
General Features in Light Intensity Modulated Photocurrent Response of Bulk-heterojuction Polymer Solar cellsMRS Spring meeting, USA2010-01
Universality in Intensity Modulated Photocurrent Spectroscopy in Bulk-Hetero-Junction Polymer Solar CellsJNCASR Annual In-House Symposium2009-01
Participation in short term courses
Couse NameSponsored ByDate
QIP on Relevance of Nanotechnology to the rechargeable battery technologyAICTE-QIP2016-01
Courses or Conferences Organised
Conference NameSponsored ByDate
QIP- on Application of Nanotechnologies in Energy SectorsAICTE-QIP2019-01
Electrochemical Impedance Spectroscopy to Study Charge and Ion Transport Kinetics in Hybrid Perovskites-based Optoelectronic DevicesnanoGe2020-11
Photo-electrochemical Impedance Spectroscopy in Hybrid Perovskites: Unveiling the Curious Case of Ion Migration2021-03-09
13th National Conference on Solid State IonicsBRNS+DST+CSIR2019-01
Special Lectures Delivered
Recent trend in photovoltaics: Advantages and challenges of new generation solar technologyENERGY CRISIS: RECENT ADVANCEMENT IN SOLAR ENERGY HARNESSING & NUCLEAR ENERGY, at Shahid Matangini Hazra Govt. College for Women2020-10
Ion migration in Perovskites: experimental evidence and theory to study ion kineticsDepartment of Applied Science, Maulana Abul Kalam Azad University of Technology (MAKAUT), West Bengal2020-09
An introduction to Solar photovoltaic technology: From Si to PerovskitesQIP centre, IIT Roorkee2016-01
Recent trend in photovoltaics: Advantages and challenges of new generation solar technologyDepartment of Physics & Astronomy, Colgate University, NY, USA2021-02-23
Polymer Nanoparticle Solar Cells: Experiment and theory to understand nanoparticle assembliesDepartment of Applied Science, Maulana Abul Kalam Azad University of Technology (MAKAUT), West Bengal2020-09
Third Generation Solar Cells: Promises and ChallengesQIP Centre, IIT Roorkee2018-01
Polymer solar cell: Controlled morphology at nano-scale for large- scale printingQIP centre, IIT Roorkee2019-01
Perovskite solar cells, stability analysis and future perspectiveQIP centre, IIT Roorkee2019-01
Nanomaterials for Thermoelectric and Thermophotovoltaic ApplicationsQIP centre, IIT Roorkee2019-01
National International Collaboration
Hyper-spectral Imaging on Hybrid Perovskite MaterialsUniversity of Cambridge, Cavendish Laboratory, UK
Super Resolution Luminescence Micro-Spectroscopy of perovskite materialsChemical Physics Dept. Lund University, Sweden
Fabrication of Perovskite LEDsIIT Bombay, India
Refereed Journal Papers

Total Citation: 1547

h-index 19. 


36.  Cation disorder and octahedral distortion control of internal electric field, band bending and carrier lifetime in Aurivillius perovskite solid-solutions for enhanced photocatalytic activity, J. Malik, S. Kumar, P. Srivastava, M. Bag, T. Mandal, Mater. Advances, 2021, (accepted).

35. Fusible Low Work-function Top Electrode for Vacuum-free Perovskite Light Emitting Diode Application: Role of OH Terminated Sn Atoms at the Alloy Surface, Ramesh Kumar, Jitendra Kumar, Monojit Bag*, ACS Appl. Electron. Mater. 2021, (just accepted).

34.  The Curious Case of Ion Migration in Solid-state and Liquid Electrolyte-based Perovskite Devices: Unveiling the Role of Charge Accumulation and Extraction at the InterfacesPriya Srivastava, Ramesh Kumar, Monojit Bag*, Phys. Chem. Chem. Phys. 2021, 23, pp-10936-10945.

33.  Discerning the Role of A-Site Cation and X-Site Anion for Ion Conductivity Tuning in Hybrid Perovskites by Photoelectrochemical Impedance Spectroscopy, Priya Srivastava, Ramesh Kumar, Monojit Bag*, J. Phys. Chem. C, 2021, 125(1), pp-211-222.


32.  Role of A-Site Cation and X-Site Halide Interactions in Mixed-Cation Mixed-Halide Perovskites for Determining Anomalously High Ideality Factor and the Super-linear Power Law in AC Ionic Conductivity at Operating Temperature, Ramesh Kumar, Priya Srivastava, Monojit Bag*, ACS Appl. Electron. Mater., 2020, 2(12), pp 4087-4098.

31.  Unraveling Antisolvent Dripping Delay Effect on the Stronski-Karstanov Growth of CH3NH3PbBr3 Thin Film: A Facile Route for Preparing Textured Morphology with Improved Optoelectronic Properties, J. Kumar, R. Kumar, K. Frohna, D. Moghe, S. D. Stranks, Monojit Bag*, Phys. Chem. Chem. Phys., 2020, 22, pp 26592-26604.  

30. Unveiling the 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, 12(30), pp 34265-34273.

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
Books Authored

Book Chapter:

4. J. Kumar, R. Kumar "Graphene-based nanocomposites for electro-optic devices". Current and Future Developments in Nanomaterials and Carbon Nanotubes: Application of Nanomaterials in Energy Storage and Electronics, Ed. G. Manik G., Sahoo S. K., Bentham Books. 2021 (accepted).

3. Verma S.K., Bag M. "Low-Cost Optical Pressure Sensor Using Flexible PDMS Grating". ICOL-2019. Springer Proceedings in Physics, Ed. Singh K., Gupta A.K., Khare S., Dixit N., Pant K.,  Springer Singapore. 2021. vol 258, pp-683-686. Print ISBN: 978-981-15-9258-4.

2.  M. Bag, R. Kumar, J. Kumar, "Emerging Carbon Nanomaterials for Organic and Perovskite based Optoelectronics Device Applications." Carbon Nanomaterial Electronics: Devices and Applications, Ed. A. Hazra and R. Goswami, Springer Nature Singapore Pte Ltd. 2021, 419-444. Print ISBN: 978-981-16-1051-6.

1.  M. BagP. Srivastava, "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. Print ISBN: 978-981-15-1266-7.

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