skip to primary navigationskip to content

Felix Utama Kosasih


I am a PhD researcher working under the supervision of Prof. Caterina Ducati. Prior to Cambridge, I received my B.Eng. with Honours in Materials Science and Engineering from the National University of Singapore. My research is focused on applying analytical SEM and TEM to study the properties, stability, and upscaling of perovskite solar cells.


My research is funded by the Jardine FoundationCambridge Trust, and ESTEEM3, an EU Horizon 2020 program.


Cross-sectional HAADF-STEM images of three MAPbI3 perovskite solar modules. Sample (a) was fabricated through spin-coating a PbI2/DMF solution followed by dipping in a MAI/IPA solution. Sample (b) used a small amount of MAI powder in the PbI2 solution, while sample (c) used both MAI powder in PbI2 and H2O in the MAI solution. Through STEM imaging, we show that these additives eliminated voids in the mesoporous TiO2 layer (red arrows) by increasing perovskite penetration and also reduced the amount of unreacted PbI2 (blue arrows). Reused with permission from 10.1021/acsami.9b05730, copyright 2019 American Chemical Society.



Cross-sectional HAADF-STEM images and EDX compositional maps after non-negative matrix factorisation (NMF) treatment of triple cation perovskite solar cells. NMF allows us to distinguish three phases within the perovskite layer: the bulk perovskite itself and PbI2 grains (NMF#1 and left spectrum) and Br-rich inclusions (NMF#2 and right spectrum), thus highlighting nanoscale heterogeneity in cells. Scale bars are 1 μm. Adapted with permission from 10.1002/aenm.201901642 (Figures 4a and S13), copyright 2019 Wiley-VCH.


Recent Publications

Wang, H., Kosasih, F.U., Yu, H., Zheng, G., Zhang, J., Pozina, G., Liu, Y, Bao, C., Hu, Z., Liu, X., Kobera, L., Abbrent, S., Brus, J., Jin, Y., Fahlman, M., Friend, R.H., Ducati, C., Liu, X-K., Gao, F. (2020). Perovskite-Molecule Hybrid Thin Films for Efficient and Stable Solution-processed Light-emitting Diodes. Nature Communications, 11, 891

Kosasih, F.U., Rakocevic, L., Aernouts, T., Poortmans, J., Ducati, C. (2019). Electron Microscopy Characterisation of P3 Lines and Laser Scribing-induced Perovskite Decomposition in Perovskite Solar Modules. ACS Applied Materials & Interfaces, 11(49), 45646-45655.

Matteocci, F., Vesce, L., Kosasih, F. U., Castriotta, L. A., Cacovich, S., Palma, A. L., Divitini, G., Ducati, C., Di Carlo, A. (2019). Fabrication and Morphological Characterization of High-Efficiency Blade-Coated Perovskite Solar Modules. ACS Applied Materials & Interfaces, 11(28), 25195–25204.

Di Girolamo, D., Matteocci, F., Kosasih, F. U., Chistiakova, G., Zuo, W., Divitini, G., Korte, L., Ducati, C., Di Carlo, A., Dini, D., Abate, A. (2019). Stability and Dark Hysteresis Correlate in NiO‐Based Perovskite Solar Cells. Advanced Energy Materials, 9(31), 1901642.

Ruggeri, E., Anaya, M., Galkowski, K., Delport, G., Kosasih, F.U., Abfalterer, A., Mackowski, S., Ducati, C., Stranks, S.D. (2019). Controlling the Growth Kinetics and Optoelectronic Properties of 2D/3D Lead-Tin Perovskite Heterojunctions. Advanced Materials, 31(51), 1905247.

Kosasih, F. U., & Ducati, C. (2018). Characterising degradation of perovskite solar cells through in-situ and operando electron microscopy. Nano Energy, 47, 243–256.

Kosasih, F. U., & Ducati, C. (2018). Attaining High Photovoltaic Efficiency and Stability with Multidimensional Perovskites. ChemSusChem, 11(24), 4193–4202.

Zhang, J., Futscher, M.H., Lami, V., Kosasih, F.U., Cho, C., Gu, Q., Sadhanala, A., Pearson, A.J., Kan, B., Divitini, G., Wan, X., Credgington, D., Greenham, N.C., Chen, Y., Ducati, C., Ehrler, B., Vaynzof, Y., Friend, R.H., Bakulin, A.A. (2019). Sequentially Deposited versus Conventional Nonfullerene Organic Solar Cells: Interfacial Trap States, Vertical Stratification, and Exciton Dissociation. Advanced Energy Materials, 9(47), 1902145.

Modarres, M. H., Kosasih, F. U., Ducati, C., & Volder, M. (2019). Self‐Assembly of rGO Coated Nanorods into Aligned Thick Films. Advanced Materials Interfaces, 6(14), 1900219.