Preparation of Single-Phase Films of CH3NH3Pb(I1-xBrx)3 with Sharp Optical Band Edges.
Aditya Sadhanala,Felix Deschler,Tudor H. Thomas,Sian E. Dutton,Karl C. Goedel,Fabian C. Hanusch,May L. Lai,Ullrich Steiner,Thomas Bein,Pablo Docampo,David Cahen,Richard H. Friend +11 more
TLDR
A bromide-iodide lead perovskite film is demonstrated with an optical bandgap of 1.94 eV, which is optimal for tandem cells of these materials with crystalline silicon devices.Abstract:
Organometallic lead-halide perovskite-based solar cells now approach 18% efficiency. Introducing a mixture of bromide and iodide in the halide composition allows tuning of the optical bandgap. We prepare mixed bromide–iodide lead perovskite films CH3NH3Pb(I1–xBrx)3 (0 ≤ x ≤ 1) by spin-coating from solution and obtain films with monotonically varying bandgaps across the full composition range. Photothermal deflection spectroscopy, photoluminescence, and X-ray diffraction show that following suitable fabrication protocols these mixed lead-halide perovskite films form a single phase. The optical absorption edge of the pure triiodide and tribromide perovskites is sharp with Urbach energies of 15 and 23 meV, respectively, and reaches a maximum of 90 meV for CH3NH3PbI1.2Br1.8. We demonstrate a bromide–iodide lead perovskite film (CH3NH3PbI1.2Br1.8) with an optical bandgap of 1.94 eV, which is optimal for tandem cells of these materials with crystalline silicon devices.read more
Citations
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High-efficiency two-dimensional Ruddlesden–Popper perovskite solar cells
Hsinhan Tsai,Hsinhan Tsai,Wanyi Nie,Jean-Christophe Blancon,Constantinos C. Stoumpos,Reza Asadpour,Boris Harutyunyan,Amanda Neukirch,Rafael Verduzco,Jared Crochet,Sergei Tretiak,Laurent Pedesseau,Jacky Even,Muhammad A. Alam,Gautam Gupta,Jun Lou,Pulickel M. Ajayan,Michael J. Bedzyk,Mercouri G. Kanatzidis,Aditya D. Mohite +19 more
TL;DR: Thin films of near-single-crystalline quality are produced, in which the crystallographic planes of the inorganic perovskite component have a strongly preferential out-of-plane alignment with respect to the contacts in planar solar cells to facilitate efficient charge transport.
Journal ArticleDOI
Metal-halide perovskites for photovoltaic and light-emitting devices
TL;DR: The broad tunability and fabrication methods of these materials, the current understanding of the operation of state-of-the-art solar cells and the properties that have delivered light-emitting diodes and lasers are described.
Journal ArticleDOI
A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells
David P. McMeekin,Golnaz Sadoughi,Waqaas Rehman,Giles E. Eperon,Michael Saliba,Maximilian T. Hörantner,Amir A. Haghighirad,Nobuya Sakai,Lars Korte,Bernd Rech,Michael B. Johnston,Laura M. Herz,Henry J. Snaith +12 more
TL;DR: It is shown that using cesium ions along with formamidinium cations in lead bromide–iodide cells improved thermal and photostability and lead to high efficiency in single and tandem cells.
Journal ArticleDOI
Reversible photo-induced trap formation in mixed-halide hybrid perovskites for photovoltaics
Eric T. Hoke,Daniel J. Slotcavage,Emma R. Dohner,Andrea R. Bowring,Hemamala I. Karunadasa,Michael D. McGehee +5 more
TL;DR: A reversible photo-induced instability has been found in mixed-halide photovoltaic perovskites that limits the open circuit voltage in solar cells.
Journal ArticleDOI
Hybrid organic—inorganic perovskites: low-cost semiconductors with intriguing charge-transport properties
TL;DR: In this paper, the authors summarize what is known and unknown about charge transport in HOIPs, with particular emphasis on their advantages as photovoltaic materials and highlight the fundamental questions that need to be addressed regarding the charge-transport properties of these materials.
References
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