Journal Article10.1021/JACS.5B13294
A Bismuth-Halide Double Perovskite with Long Carrier Recombination Lifetime for Photovoltaic Applications
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TL;DR: The double-perovskites are used to incorporate nontoxic Bi(3+) into the perovskite lattice in Cs2AgBiBr6 (1), which shows a long room-temperature fundamental photoluminescence (PL) lifetime and comparison between single-crystal and powder PL decay curves of 1 suggests inherently high defect tolerance.
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Abstract: Despite the remarkable rise in efficiencies of solar cells containing the lead-halide perovskite absorbers RPbX3 (R = organic cation; X = Br– or I–), the toxicity of lead remains a concern for the large-scale implementation of this technology. This has spurred the search for lead-free materials with similar optoelectronic properties. Here, we use the double-perovskite structure to incorporate nontoxic Bi3+ into the perovskite lattice in Cs2AgBiBr6 (1). The solid shows a long room-temperature fundamental photoluminescence (PL) lifetime of ca. 660 ns, which is very encouraging for photovoltaic applications. Comparison between single-crystal and powder PL decay curves of 1 suggests inherently high defect tolerance. The material has an indirect bandgap of 1.95 eV, suited for a tandem solar cell. Furthermore, 1 is significantly more heat and moisture stable compared to (MA)PbI3. The extremely promising optical and physical properties of 1 shown here motivate further exploration of both inorganic and hybrid hal...
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Citations
Lead-free double perovskites Cs2InCuCl6 and (CH3NH3)2InCuCl6: electronic, optical, and electrical properties
TL;DR: The properties of indium-based inorganic double perovskites Cs2InMX6 and MA2InCuCl6 are explored using computation within Kohn-Sham density functional theory to find promising semiconductors for photovoltaic and optoelectronic applications.
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Machine learning stability and band gap of lead-free halide double perovskite materials for perovskite solar cells
Zongmei Guo,Bin Lin +1 more
TL;DR: In this article, a machine learning framework was proposed to investigate thermodynamic stability and band gap of lead-free halide double perovskites at high speed and high precision, and analyzed the importance of selected features and provided directions for discovering potential lead free perovsites.
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The Bottlenecks of Cs2AgBiBr6 Solar Cells: How Contacts and Slow Transients Limit the Performance
Maximilian T. Sirtl,Firouzeh Ebadi,Bas T. van Gorkom,Patrick Ganswindt,René A. J. Janssen,Thomas Bein,Wolfgang Tress +6 more
TL;DR: In this article, the photovoltaic parameters of Cs2AgBiBr6-based solar cells strongly depend on the scan speed of the J/V measurements, suggesting a strong impact of ionic conductivity in the material.
Current Advancements in Material Research and Techniques Focusing on Lead-free Perovskite Solar Cells
TL;DR: In this article, the authors summarize the current development of various types of Pb-free perovskites, such as the Sn-, Bi-, Ge-, Sr-, and Cu-based PSCs and their devices.
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First-Principles Study on the Structure, Electronic, and Optical Properties of Cs2AgBiBr6-xClx Mixed-Halide Double Perovskites
TL;DR: Double halide perovskites Cs2AgBiX6 (X = Cl, Br) have been proposed as promising nontoxic materials with enhanced chemical stability for the optoelectronic application as mentioned in this paper.
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