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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
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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
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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
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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
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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
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Maheswari, S. (author), Savenije, T.J. (author), Renaud, N. (author), Grozema, F.C. (author)Two-dimensional (2D) halide perovskites are a class of materials in which 2D layers of perovskite are separated by large organic cations. Conventionally, the 2D perovskites incorporate organic cations as spacers, but these organic cations also offer a route to introduce specific functionality in the material. In this work, we demonstrate, by...journal article 2018
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Bartesaghi, D. (author), Ray, Aniruddha (author), Jiang, Junke (author), Bouwer, Ricardo K.M. (author), Tao, S. (author), Savenije, T.J. (author)Tailoring the physical properties of hybrid lead metal halide APbX<sub>3</sub> perovskites by means of compositional engineering is one of the key factors contributing to the development of highly efficient and stable perovskite solar cells. While the beneficial effects of partial ionic replacement at the A- and X-sites are largely...journal article 2018
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Hutter, E.M. (author), Gelvez Rueda, M.C. (author), Bartesaghi, D. (author), Grozema, F.C. (author), Savenije, T.J. (author)Recently, halide double perovskites (HDPs), such as Cs<sub>2</sub>AgBiBr<sub>6</sub>, have been reported as promising nontoxic alternatives to lead halide perovskites. However, it remains unclear whether the charge-transport properties of these materials are as favorable as for lead-based perovskites. In this work, we study the mobilities of...journal article 2018
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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
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Gelvez Rueda, M.C. (author), Hutter, E.M. (author), Cao, Duyen H. (author), Renaud, N. (author), Stoumpos, Constantinos C. (author), Hupp, Joseph T. (author), Savenije, T.J. (author), Kanatzidis, Mercouri G. (author), Grozema, F.C. (author)The optoelectronic properties of hybrid perovskites can be easily tailored by varying their components. Specifically, mixing the common short organic cation (methylammonium (MA)) with a larger one (e.g., butyl ammonium (BA)) results in 2-dimensional perovskites with varying thicknesses of inorganic layers separated by the large organic cation...journal article 2017
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Guo, Dengyang (author), Bartesaghi, D. (author), Wei, Haotong (author), Hutter, E.M. (author), Huang, Jinsong (author), Savenije, T.J. (author)In view of its band gap of 2.2 eV and its stability, methylammonium lead bromide (MAPbBr<sub>3</sub>) is a possible candidate to serve as a light absorber in a subcell of a multijunction solar cell. Using complementary temperature-dependent time-resolved microwave conductance (TRMC) and photoluminescence (TRPL) measurements, we demonstrate...journal article 2017
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Brenes, Roberto (author), Guo, Dengyang (author), Osherov, Anna (author), Noel, Nakita K. (author), Eames, Christopher (author), Hutter, E.M. (author), Pathak, Sandeep K. (author), Niroui, Farnaz (author), Friend, Richard H. (author), Islam, M. Saiful (author), Snaith, Henry J. (author), Bulović, Vladimir (author), Savenije, T.J. (author), Stranks, Samuel D. (author)Metal halide perovskites are generating enormous excitement for use in solar cells and light-emission applications, but devices still show substantial non-radiative losses. Here, we show that by combining light and atmospheric treatments, we can increase the internal luminescence quantum efficiencies of polycrystalline perovskite films from 1...journal article 2017
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Hutter, E.M. (author), Gelvez Rueda, M.C. (author), Osherov, Anna (author), Bulović, Vladimir (author), Grozema, F.C. (author), Stranks, Samuel D. (author), Savenije, T.J. (author)Metal halide perovskites such as methylammonium lead iodide (CH<sub>3</sub> NH<sub>3</sub> PbI<sub>3</sub>) are generating great excitement due to their outstanding optoelectronic properties, which lend them to application in high-efficiency solar cells and light-emission devices. However, there is currently debate over what drives the second...journal article 2017
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Hutter, E.M. (author), Sutton, Rebecca J. (author), Chandrashekar, Sanjana (author), Abdi-Jalebi, Mojtaba (author), Stranks, Samuel D. (author), Snaith, Henry J. (author), Savenije, T.J. (author)Metal halide perovskites such as methylammonium lead iodide (MAPbI3) are highly promising materials for photovoltaics. However, the relationship between the organic nature of the cation and the optoelectronic quality remains debated. In this work, we investigate the optoelectronic properties of fully inorganic vapour-deposited and spin-coated...journal article 2017
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Gelvez Rueda, M.C. (author), Cao, Duyen H. (author), Patwardhan, Sameer (author), Renaud, N. (author), Stoumpos, Constantinos C. (author), Schatz, George C. (author), Hupp, Joseph T. (author), Farha, Omar K. (author), Savenije, T.J. (author), Kanatzidis, Mercouri G. (author), Grozema, F.C. (author)Organic-inorganic hybrid halide perovskites are a promising class of materials for photovoltaic application with reported power efficiencies over ∼22%. However, not much is known about the influence of the organic dipole rotation and phase transitions on charge carrier dynamics. Here, we report substantial changes in mobility and lifetime of...journal article 2016
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Melianas, Armantas (author), Etzold, Fabian (author), Savenije, T.J. (author), Laquai, Frédéric (author), Inganäs, Olle (author), Kemerink, Martijn (author)In photovoltaic devices, the photo-generated charge carriers are typically assumed to be in thermal equilibrium with the lattice. In conventional materials, this assumption is experimentally justified as carrier thermalization completes before any significant carrier transport has occurred. Here, we demonstrate by unifying time-resolved...journal article 2015
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Rafieian, Damon (author), Ogieglo, Wojciech (author), Savenije, T.J. (author), Lammertink, Rob G H (author)We discuss the formation of TiO<sub>2</sub> thin films via DC reactive magnetron sputtering. The oxygen concentration during sputtering proved to be a crucial parameter with respect to the final film structure and properties. The initial deposition provided amorphous films that crystallise upon annealing to anatase or rutile, depending on the...journal article 2015
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Günba?, D.D. (author), Xue, C. (author), Patwardhan, S. (author), Fravventura, M.C. (author), Zhang, H. (author), Jager, W.F. (author), Sudhölter, E.J.R. (author), Laurens, D.A. (author), Siebbeles, L.D.A. (author), Savenije, T.J. (author), Jin, S. (author), Grozema, F.C. (author)In this communication we report on the synthesis and charge mobility of highly soluble perylenebisimid derivatives.We show that introduction of alkylester side chains results in compounds combining a high solubility with charge mobilities up to 0.22 cm2 V_1 s_1. These materials are therefore interesting as an electron acceptor for solution...journal article 2014
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Nasalevich, M.A. (author), Goesten, M.G. (author), Savenije, T.J. (author), Kapteijn, F. (author), Gascon, J. (author)NH2-MIL-125(Ti) has been post-synthetically functionalized with dye-like molecular fragments. The new material (methyl red-MIL- 125(Ti)) exhibits improved light absorption over a wide range of the visible spectrum, and shows enhanced photocatalytic oxidation activity under visible light illumination. The consequences of functionalization and the...journal article 2013
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Suchand Sandeep, C.S. (author), Ten Cate, S. (author), Schins, J.M. (author), Savenije, T.J. (author), Liu, Y. (author), Law, M. (author), Kinge, S. (author), Houtepen, A.J. (author), Siebbeles, L.D.A. (author)Carrier multiplication, the generation of multiple electron–hole pairs by a single photon, is of great interest for solar cells as it may enhance their photocurrent. This process has been shown to occur efficiently in colloidal quantum dots, however, harvesting of the generated multiple charges has proved difficult. Here we show that by tuning...journal article 2013