- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
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
- document
-
Felter, K.M. (author), Caselli, V.M. (author), Gunbas, D.D. (author), Savenije, T.J. (author), Grozema, F.C. (author)Two of the key parameters that characterize the usefulness of organic semiconductors for organic or hybrid organic/inorganic solar cells are the mobility of charges and the diffusion length of excitons. Both parameters are strongly related to the supramolecular organization in the material. In this work we have investigated the relation...journal article 2019
- document
-
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
- document
-
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
- document
-
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
- document
-
Andaji-Garmaroudi, Zahra (author), Abdi-Jalebi, Mojtaba (author), Guo, Dengyang (author), Macpherson, Stuart (author), Sadhanala, Aditya (author), Tennyson, Elizabeth M. (author), Ruggeri, Edoardo (author), Anaya, Miguel (author), Savenije, T.J. (author)Mixed-halide lead perovskites have attracted significant attention in the field of photovoltaics and other optoelectronic applications due to their promising bandgap tunability and device performance. Here, the changes in photoluminescence and photoconductance of solution-processed triple-cation mixed-halide (Cs<sub>0.06</sub>MA<sub>0.15</sub...journal article 2019
- document
-
Caselli, V.M. (author), Fischer, Mathias (author), Meggiolaro, Daniele (author), Mosconi, Edoardo (author), De Angelis, Filippo (author), Stranks, Samuel D. (author), Baumann, Andreas (author), Dyakonov, Vladimir (author), Hutter, E.M. (author), Savenije, T.J. (author)Recently, several studies have investigated dielectric properties as a possible origin of the exceptional optoelectronic properties of metal halide perovskites (MHPs). In this study we investigated the temperature-dependent dielectric behavior of different MHP films at different frequencies. In the gigahertz regime, dielectric losses in...journal article 2019
- document
-
Guo, Dengyang (author), Caselli, V.M. (author), Hutter, E.M. (author), Savenije, T.J. (author)While the power conversion efficiency of metal halide perovskite (MHP) solar cells has increased enormously, the open-circuit voltage, V <sub>oc</sub> , is still below the conceivable limit. Here, we derive the Fermi level splitting, μ <sub>F</sub> , for various types of noncontacted MHPs, which sets a limit for their achievable V <sub>oc<...journal article 2019
- document
-
Bartesaghi, D. (author), Slavney, Adam H. (author), Gelvez Rueda, M.C. (author), Connor, Bridget A. (author), Grozema, F.C. (author), Karunadasa, Hemamala I. (author), Savenije, T.J. (author)Double perovskites, comprising two different cations, are potential nontoxic alternatives to lead halide perovskites. Here, we characterized thin films and crystals of Cs<sub>2</sub>AgBiBr<sub>6</sub> by time-resolved microwave conductance (TRMC), which probes formation and decay of mobile charges upon pulsed irradiation. Optical excitation...journal article 2018
- document
-
Abdi-Jalebi, Mojtaba (author), Andaji-Garmaroudi, Zahra (author), Cacovich, Stefania (author), Stavrakas, Camille (author), Philippe, Bertrand (author), Richter, Johannes M. (author), Alsari, Mejd (author), Booker, Edward P. (author), Hutter, E.M. (author), Savenije, T.J. (author)Metal halide perovskites are of great interest for various high-performance optoelectronic applications. The ability to tune the perovskite bandgap continuously by modifying the chemical composition opens up applications for perovskites as coloured emitters, in building-integrated photovoltaics, and as components of tandem photovoltaics to...journal article 2018
- document
-
Hutter, E.M. (author), Savenije, T.J. (author)The relationship between the dipole moment of the methylammonium cation and the optoelectronic properties of lead halide perovskites remains under debate. We show that both the temperature-dependent charge carrier mobility and recombination kinetics are identical for methylammonium and cesium lead iodide, indicating that the role of the...journal article 2018