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Open AccessJournal ArticleDOI

A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells

TLDR
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.
Abstract
Metal halide perovskite photovoltaic cells could potentially boost the efficiency of commercial silicon photovoltaic modules from ∼20 toward 30% when used in tandem architectures. An optimum perovskite cell optical band gap of ~1.75 electron volts (eV) can be achieved by varying halide composition, but to date, such materials have had poor photostability and thermal stability. Here we present a highly crystalline and compositionally photostable material, [HC(NH2)2](0.83)Cs(0.17)Pb(I(0.6)Br(0.4))3, with an optical band gap of ~1.74 eV, and we fabricated perovskite cells that reached open-circuit voltages of 1.2 volts and power conversion efficiency of over 17% on small areas and 14.7% on 0.715 cm(2) cells. By combining these perovskite cells with a 19%-efficient silicon cell, we demonstrated the feasibility of achieving >25%-efficient four-terminal tandem cells.

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Citations
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Journal ArticleDOI

Light-Induced Phase Segregation in Halide-Perovskite Absorbers

TL;DR: In this paper, the authors discuss the thermodynamic origin and consequences of light-induced phase segregation observed in mixed-halide perovskites and propose that modifying the composition and lattice structure, increasing compositional uniformity, and reducing defect concentrations could significantly improve stability.
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Band Gaps of the Lead-Free Halide Double Perovskites Cs2BiAgCl6 and Cs2BiAgBr6 from Theory and Experiment

TL;DR: From the complementary theoretical and experimental analysis, this work is able to assign the indirect character of the band gaps and obtain both experimental and theoretical band gaps of these novel semiconductors that are in close agreement.
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Suppression of atomic vacancies via incorporation of isovalent small ions to increase the stability of halide perovskite solar cells in ambient air

TL;DR: In this article, the effect of local lattice strain on vacancy formation was investigated in single-cation/halide perovskites and the authors showed that judiciously selected dopants can maximize the formation energy of defects responsible for degradation.
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Anharmonicity and Disorder in the Black Phases of Cesium Lead Iodide Used for Stable Inorganic Perovskite Solar Cells

TL;DR: It is shown through high-resolution in situ synchrotron XRD measurements that CsPbI3 can be undercooled below its transition temperature and temporarily maintained in its perovskite structure down to room temperature, stabilizing a metastable perovkite polytype (black γ-phase) crucial for photovoltaic applications.
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Halide lead perovskites for ionizing radiation detection

TL;DR: The promising features and challenges of halide perovskites as promising radiation detectors are shown and it is suggested that they may compete with the conventional counterparts.
References
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Journal ArticleDOI

Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites

TL;DR: A low-cost, solution-processable solar cell, based on a highly crystalline perovskite absorber with intense visible to near-infrared absorptivity, that has a power conversion efficiency of 10.9% in a single-junction device under simulated full sunlight is reported.
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Sequential deposition as a route to high-performance perovskite-sensitized solar cells

TL;DR: A sequential deposition method for the formation of the perovskite pigment within the porous metal oxide film that greatly increases the reproducibility of their performance and allows the fabrication of solid-state mesoscopic solar cells with unprecedented power conversion efficiencies and high stability.
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Efficient planar heterojunction perovskite solar cells by vapour deposition

TL;DR: It is shown that perovskite absorbers can function at the highest efficiencies in simplified device architectures, without the need for complex nanostructures.
Journal ArticleDOI

Solvent engineering for high-performance inorganic–organic hybrid perovskite solar cells

TL;DR: A bilayer architecture comprising the key features of mesoscopic and planar structures obtained by a fully solution-based process is reported, providing important progress towards the understanding of the role of solution-processing in the realization of low-cost and highly efficient perovskite solar cells.
Journal ArticleDOI

The emergence of perovskite solar cells

TL;DR: In this article, a review describes the rapid progress that has been made in hybrid organic-inorganic perovskite solar cells and their applications in the photovoltaic sector.
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