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Cavendish Laboratory, Cambridge

Studying at Cambridge


Dr M. Ibrahim Dar

Dr M. Ibrahim Dar

Royal Society University Research Fellow

Optoelectronics Group
Cavendish Laboratory
University of Cambridge
J J Thomson Avenue


Key Publications

(*= corresponding author)

 Perovskite Solar Cells

  1. N. Arora,† M. IBRAHIM DAR,†* A. Hinderhofer, N. Pellet, F. Schreiber, S. M. Zakeeruddin, M.  Grätzel* Perovskite solar cells with CuSCN hole extraction layers yield stabilized efficiencies greater than 20%. Science 2017, 358, 768-771. DOI: 10.1126/science.aam5655 (†= authors contributed equally)
  2. Y. Wang, M. IBRAHIM. DAR,* L.K. Ono, T. Zhang, M. Kan, Y. Li, L. Zhang, X. Wang, Y. Yang, X. Gao, Y. Qi,* M. Grätzel,* Y. Zhao* Thermodynamically stabilized β-CsPbI3 based perovskite solar cells with efficiencies >18%, Science, 2019,  365, 591-595. DOI: 10.1126/science.aav8680  
  3. T. Zhang, M. IBRAHIM. DAR, G. Li, F. Xu, N. Guo, M. Grätzel, Y. Zhao Bication lead iodide 2D perovskite component to stabilize inorganic α-CsPbI3 perovskite phase for high-efficiency solar cells. Science Advances 2017, 3, e1700841. DOI: 10.1126/sciadv.1700841  
  4. M. Abdi-Jalebi,* M. IBRAHIM DAR, S. P. Senanayak, A. Sadhanala, Z. Andaji-Garmaroudi, L. M. Pazos-Outón, J. M. Richter, A. J. Pearson, H. Sirringhaus, M. Grätzel and R. H. Friend.* Charge extraction via graded doping of hole transport layers gives highly luminescent and stable metal halide perovskite devices. Science Advances, 2019, 5, eaav2012. DOI: 10.1126/sciadv.aav2012
  5. N. Arora,† M. IBRAHIM DAR,†* M. Abdi-Jalebi, F. Giordano, N. Pellet, G. Jacopin, R. H. Friend, S. M. Zakeeruddin, M. Grätzel.* Intrinsic and Extrinsic Stability of Formamidinium Lead Bromide Perovskite Solar Cells Yielding High Photovoltage. Nano Letters 2016, 16, 7155–7162. DOI: 10.1021/acs.nanolett.6b03455  (†= authors contributed equally)
  6. M. IBRAHIM DAR,* M. Abdi-Jalebi, N. Arora, T. Moehl, M. Grätzel, and M. K. Nazeeruddin.*  Understanding the impact of bromide on the photovoltaic performance of CH3NH3PbI3 solar cells. Advanced Materials 2015, 27, 7221–7228. DOI:10.1002/adma.201503124


Emission Spectroscopy

  1. M. IBRAHIM DAR,* G. Jacopin, S. Meloni, A. Mattoni, N. Arora, A. Boziki, S. M. Zakeeruddin, U. Rothlisberger, M. Graetzel. Origin of unusual bandgap shift and dual emission in organic-inorganic lead halide perovskites. Science Advances 2016, 2, e1601156. DOI: 10.1126/sciadv.1601156
  2. D. Bi, W. Tress, M. IBRAHIM. DAR, P. Gao, J. Luo, C. Renevier, K. Schenk, A. Abate, F. Giordano, J.-P. Correa Baena, J.-D. Decoppet, S. M. Zakeeruddin, M. K. Nazeeruddin, M. Grätzel, A. Hagfeldt. Efficient luminescent solar cells based on tailored mixed-cation perovskites. Science Advances 2016, 2, e1501170. DOI:  10.1126/sciadv.1501170
  3. N. Arora,† M. IBRAHIM DAR,†* M. Hezam, W. Tress, G. Jacopin, T. Moehl, P. Gao, A. S. Aldwayyan, B. Deveaud, M. Grätzel, and M. K. Nazeeruddin. Photovoltaic and Amplified Spontaneous Emission Studies of High-Quality Formamidinium Lead Bromide Perovskite Films. Advanced Functional Materials 2016, 26, 2846–2854. DOI: 10.1002/adfm.201504977  (†= authors contributed equally
  4. M. IBRAHIM DAR,* G. Jacopin, M. Hezam, N. Arora, S. M.Zakeeruddin, B. Deveaud, M. K. Nazeeruddin, M. Graetzel. Asymmetric cathodoluminescence emission in CH3NH3PbI3-xBrx Perovskite Single Crystals. ACS Photonics 2016, 3, 947–952. DOI: 10.1021/acsphotonics.6b00290  


X-ray Scattering

  1. Y. Liu, S.Akin, L. Pan, R. Uchida, N. Arora, J. V.  Milic, A. Hinderhofer, F. Schreiber, A. R. Uhl, S. M. Zakeeruddin, A. Hagfeldt, M. IBRAHIM DAR,* M. Grätzel*Ultra-Hydrophobic 3D/2D Fluoroarene Bilayer-Based Water-Resistant Perovskite Solar Cells with Efficiencies Exceeding 22%. Science Advances, 2019, 5, eaaw2543 DOI: 10.1126/sciadv.aaw2543
  2. M. IBRAHIM. DAR*, A. Hinderhofer, G. Jacopin, V. Belova, N. Arora, S. M. Zakeeruddin, F. Schreiber and M. Grätzel. Function Follows Form: Correlation between the Growth and Local Emission of Perovskite Structures and the Performance of Solar Cells. Advanced Functional Materials, 2017, 27, 1701433. DOI: 10.1002/adfm.201701433
  3. A. Greco, A. Hinderhofer,* M. IBRAHIM. DAR,* N. Arora, J. Hagenlocher, A. Chumakov, M. Grätzel and F. Schreiber. Kinetics of Ion-Exchange Reactions in Hybrid Organic–Inorganic Perovskite Thin Films Studied by in Situ Real-Time X-ray Scattering. The Journal of Physical Chemistry Letters, 2018, 9, 6750-6754. DOI: 10.1021/acs.jpclett.8b02916  


Electron Microscopy

  1. X. Li, M. IBRAHIM DAR, C. Yi, J. Luo, M. Tschumi, S. M. Zakeeruddin, M. K. Nazeeruddin, H. Han, M. Grätzel* Improved performance and stability of perovskite solar cells by crystal crosslinking with alkylphosphonic acid ω-ammonium chlorides. Nature Chemistry 2015, 7, 703-711. DOI: 10.1038/nchem.2324
  2. M. IBRAHIM DAR,* N. Arora, P. Gao, S. Ahmad, M. Grätzel,* and M. K. Nazeeruddin.* Investigation Regarding the Role of Chloride in Organic-Inorganic Halide Perovskites Obtained from Chloride Containing Precursors. Nano Letters 2014, 14, 6991–6996.  DOI: 10.1021/nl503279x
  3. M. IBRAHIM DAR, F. J. Ramos, Srinivasrao A. Shivashankar, Shahzada Ahmad, Bin Liu, Mohammad Khaja Nazeeruddin,* and Michael Grätzel.* Photoanode based on (001)-oriented anatase nanoplatelets for organic-inorganic lead iodide perovskite solar cell. Chemistry of Materials 2014, 26, 4675–4678. DOI: 10.1021/cm502185s