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Glück, Nadja (author), Hill, Nathan S. (author), Giza, Marcin (author), Hutter, E.M. (author), Grill, Irene (author), Schlipf, Johannes (author), Bach, Udo (author), Bein, Thomas (author), Savenije, T.J. (author)A better understanding of the materials' fundamental physical processes is necessary to push hybrid perovskite photovoltaic devices towards their theoretical limits. The role of the perovskite grain boundaries is essential to optimise the system thoroughly. The influence of the perovskite grain size and crystal orientation on physical...journal article 2024
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Zhao, J. (author), Liu, X. (author), Wu, Zijin (author), Ibrahim, B. (author), Thieme, J. (author), Brocks, Geert (author), Tao, Shuxia (author), Bannenberg, L.J. (author), Savenije, T.J. (author)State-of-the-art triple cation, mixed halide perovskites are extensively studied in perovskite solar cells, showing very promising performance and stability. However, an in-depth fundamental understanding of how the phase behavior in Cs<sub>0.05</sub>FA<sub>0.85</sub>MA<sub>0.10</sub>Pb(I<sub>0.97</sub>Br<sub>0.03</sub>)<sub>3</sub> (CsMAFA)...journal article 2023
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Savenije, T.J. (author), Zhao, J. (author), Caselli, V.M. (author)Perovskite-based solar cells have been rapidly developed, with record power conversion efficiencies now exceeding 25%. In order to rationally improve the efficiency of these devices, it is important to understand and quantify the dynamics of the excess charge carriers.book chapter 2023
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Colombi, G. (author), Boshuizen, B. (author), Chaykina, D. (author), Hsu, Y. (author), Schreuders, H. (author), Savenije, T.J. (author), Dam, B. (author)At ambient conditions, rare-earth oxyhydride thin films show reversible photochromism and photoconductivity, while their mechanism and relation are still unclear. In this work, this question is explored with in situ time-resolved measurements of both optical and transport properties of Gd-based oxyhydride thin films. It is found that p-type...journal article 2023
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Yan, J. (author), Zhao, J. (author), Wang, H. (author), Kerklaan, Mels (author), Bannenberg, L.J. (author), Ibrahim, B. (author), Savenije, T.J. (author), Mazzarella, L. (author), Isabella, O. (author)Multiple-source thermal evaporation is emerging as an excellent technique to obtain perovskite (PVK) materials for solar cell applications due to its solvent-free processing, accurate control of stoichiometric ratio, and potential for scalability. Nevertheless, the currently reported layer-by-layer deposition approach is afflicted by long...review 2023
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van der Werf, Verena M. (author), Zhao, J. (author), Koning, Jim S. (author), Nespoli, J. (author), Thieme, J. (author), Bus, M. (author), Savenije, T.J. (author)Metal-halide perovskites deposited by wet-chemical deposition have demonstrated great potential for various electronic applications, including solar cells. A remaining question is how light-induced excess charges become distributed over such polycrystalline material. Here, we examine the local conductive properties of MAPbI<sub>3</sub> and...journal article 2023
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Yan, J. (author), Stickel, L.S. (author), van den Hengel, L. (author), Wang, H. (author), Ravi Anusuyadevi, P. (author), Kooijman, A.M. (author), Liu, X. (author), Ibrahim, B. (author), Mol, J.M.C. (author), Taheri, P. (author), Mazzarella, L. (author), Isabella, O. (author), Savenije, T.J. (author)The preferential orientation of the perovskite (PVK) is typically accomplished by manipulation of the mixed cation/halide composition of the solution used for wet processing. However, for PVKs grown by thermal evaporation, this has been rarely addressed. It is unclear how variation in crystal orientation affects the optoelectronic properties of...journal article 2023
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Yan, J. (author), Savenije, T.J. (author), Mazzarella, L. (author), Isabella, O. (author)Since the first application of a metal halide perovskite (PVK) absorber in a solar cell, these materials have drawn a great deal of attention in the photovoltaic (PV) community, showing exceptional rapid progress in power conversion efficiency. The potential advantages of low-cost, high efficiency, easy processability, and wide range of...review 2022
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Zhao, J. (author), Li, Jia (author), Liu, X. (author), Bannenberg, L.J. (author), Bruno, Annalisa (author), Savenije, T.J. (author)Co-evaporation of metal halide perovskites by thermal evaporation is an attractive method since it does not require harmful solvents and enables precise control of the film thickness. Furthermore, the ability to manipulate the Fermi level allows the formation of a graded homojunction, providing interesting opportunities to improve the charge...journal article 2022
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Hempel, Hannes (author), Savenije, T.J. (author), Stolterfoht, Martin (author), Neu, Jens (author), Failla, M. (author), Paingad, Vaisakh C. (author), Kužel, Petr (author), Zhao, J. (author), Siebbeles, L.D.A. (author)Mobilities and lifetimes of photogenerated charge carriers are core properties of photovoltaic materials and can both be characterized by contactless terahertz or microwave measurements. Here, the expertise from fifteen laboratories is combined to quantitatively model the current-voltage characteristics of a solar cell from such measurements....journal article 2022
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Caselli, V.M. (author), Thieme, J. (author), Jöbsis, Huygen J. (author), Phadke, S.A. (author), Zhao, J. (author), Hutter, Eline M. (author), Savenije, T.J. (author)Suitable optoelectronic properties of lead halide perovskites make these materials interesting semiconductors for many applications. Toxic lead can be substituted by combining monovalent and trivalent cations, such as in Cs<sub>2</sub>AgBiBr<sub>6</sub>. However, efficiencies of Cs<sub>2</sub>AgBiBr<sub>6</sub>-based photovoltaics are still...journal article 2022
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Caselli, V.M. (author), Savenije, T.J. (author)To increase the open-circuit voltage in perovskite-based solar cells, recombination processes at the interface with transport layers (TLs) should be identified and reduced. We investigated the charge carrier dynamics in bilayers of methylammonium lead iodide (MAPbI3) with C60 or Spiro-OMeTAD using time-resolved microwave conductance (TRMC)...journal article 2022
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Jöbsis, Huygen J. (author), Caselli, V.M. (author), Askes, Sven H.C. (author), Garnett, Erik C. (author), Savenije, T.J. (author), Rabouw, Freddy T. (author), Hutter, Eline M. (author)Cs<sub>2</sub>AgBiBr<sub>6</sub> (CABB) has been proposed as a promising nontoxic alternative to lead halide perovskites. However, low charge carrier collection efficiencies remain an obstacle for the incorporation of this material in optoelectronic applications. In this work, we study the optoelectronic properties of CABB thin films using...journal article 2021
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Zhao, J. (author), Caselli, V.M. (author), Bus, M. (author), Boshuizen, B. (author), Savenije, T.J. (author)Wide-band-gap perovskites such as methylammonium lead bromide (MAPB) are promising materials for tandem solar cells because of their potentially high open-circuit voltage, which is yet still far below the maximum limit. The relatively short charge-carrier lifetimes deduced from time-resolved photoluminescence (TRPL) measurements seem in...journal article 2021
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Lin, Yuze (author), Li, Tao (author), Liu, Ye (author), Bahrami, Behzad (author), Guo, Dengyang (author), Fang, Yanjun (author), Shao, Yuchuan (author), Wang, Qi (author), Savenije, T.J. (author)A long photoluminescence decay lifetime has been regarded as a generic indication of long charge carrier recombination lifetime in semiconductors such as metal halide perovskites (MHPs), which have shown tremendous success in solar cells. Here, we report that MHP polycrystalline films with extrinsic metal ions have a very long charge...journal article 2021
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Caselli, V.M. (author), Wei, Z. (author), Ackermans, M.M. (author), Hutter, E.M. (author), Ehrler, Bruno (author), Savenije, T.J. (author)To further understand the optoelectronic properties of metal halide perovskites, we investigate sub-bandgap absorption in methylammonium lead iodide (MAPbI3) films. Charge carrier dynamics are studied using time-resolved microwave conductivity measurements using sub-bandgap excitation. From changes in the decay dynamics as a function of...journal article 2020
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Felter, K.M. (author), Fravventura, Maria C. (author), Koster, Emma (author), Abellon, R.D. (author), Savenije, T.J. (author), Grozema, F.C. (author)In this contribution we demonstrate a solid-state approach to triplet-triplet annihilation upconversion for application in a solar cell device in which absorption of near-infrared light is followed by direct electron injection into an inorganic substrate. We use time-resolved microwave photoconductivity experiments to study the injection of...journal article 2020
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Wei, Z. (author), Guo, Dengyang (author), Thieme, J. (author), Katan, Claudine (author), Caselli, V.M. (author), Even, Jacky (author), Savenije, T.J. (author)Despite intense research into the optoelectronic properties of metal halide perovskites (MHPs), sub-bandgap absorption in MHPs remains largely unexplored. Here we recorded two-photon absorption spectra of MHPs using the time-resolved microwave conductivity technique. A two-step upward trend is observed in the two-photon absorption spectrum...journal article 2019
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Muscarella, Loreta A. (author), Hutter, E.M. (author), Sanchez, Sandy (author), Dieleman, Christian D. (author), Savenije, T.J. (author), Hagfeldt, Anders (author), Saliba, Michael (author), Ehrler, Bruno (author)Growing large, oriented grains of perovskite often leads to efficient devices, but it is unclear if properties of the grains are responsible for the efficiency. Domains observed in SEM are commonly misidentified with crystallographic grains, but SEM images do not provide diffraction information. We study methylammoinium lead iodide (MAPbI<sub...journal article 2019
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Guo, Dengyang (author), Andaji Garmaroudi, Zahra (author), Abdi-Jalebi, Mojtaba (author), Stranks, Samuel D. (author), Savenije, T.J. (author)The highest reported efficiencies of metal halide perovskite (MHP) solar cells are all based on mixed perovskites, such as (FA,MA,Cs)Pb(I<sub>1-x</sub>Br<sub>x</sub>)<sub>3</sub>. Despite demonstrated structural changes induced by light soaking, it is unclear how the charge carrier dynamics are affected across this entire material family....journal article 2019