Creation and Annihilation of Nonradiative Recombination Centers in Polycrystalline Metal Halide Perovskites by Alternating Electric Field and Light

2019 ◽  
Vol 8 (4) ◽  
pp. 1901642 ◽  
Author(s):  
Ruiyun Chen ◽  
Jun Li ◽  
Alexander Dobrovolsky ◽  
Soranyel González‐Carrero ◽  
Marina Gerhard ◽  
...  
Keyword(s):  
Electric Field ◽  
Metal Halide ◽  
Nonradiative Recombination ◽  
Polycrystalline Metal ◽  
Alternating Electric Field ◽  
Recombination Centers ◽  
Halide Perovskites

Mechanisms of exciton photoluminescence quenching in the electric field of a standing surface acoustic wave

2019 ◽  
Vol 33 (06) ◽  
pp. 1950032
Author(s):  
D. V. Gulyaev ◽  
K. S. Zhuravlev
Keyword(s):  
Acoustic Wave ◽  
Electric Field ◽  
Quantum Wells ◽  
Surface Acoustic Wave ◽  
Impact Ionization ◽  
Interface Roughness ◽  
Nonradiative Recombination ◽  
Recombination Centers ◽  
Subsequent Capture ◽  
The Impact

Mechanisms of exciton photoluminescence (PL) quenching in the longitudinal electric field of a standing surface acoustic wave (SAW) have been studied by the example of type II GaAs/AlAs superlattices (SLs). Such SLs with a long lifetime of nonequilibrium carriers have allowed examining the influence of the SAW electric field on the excitonic PL both under the continuous and impulse laser excitations. It has been found that the mechanisms of the interaction of excitons and a SAW electric field depend upon the kinetic energy of excitons and carriers. As for hot excitons and carriers, the standing SAW electric field causes the impact ionization of excitons with a subsequent capture of free carriers at the nonradiative recombination centers, which results in a decrease in the steady-state exciton PL. As for cold excitons and carriers, the impact of excitons with the carriers accelerated by the SAW electric field results mainly in exciton delocalization from the levels of quantum wells formed due to interface roughness with a subsequent capture of excitons at the nonradiative recombination centers, which leads to the acceleration of the PL kinetics.

Interplay of Mobile Ions and Injected Carriers Creates Recombination Centers in Metal Halide Perovskites under Bias

2018 ◽  
Vol 3 (6) ◽  
pp. 1279-1286 ◽  
Author(s):  
Susanne T. Birkhold ◽  
Jake T. Precht ◽  
Hongbin Liu ◽  
Rajiv Giridharagopal ◽  
Giles E. Eperon ◽  
...  
Keyword(s):  
Metal Halide ◽  
Recombination Centers ◽  
Halide Perovskites ◽  
Mobile Ions

Lead-Free Metal Halide Perovskite Nanocrystals for Photocatalysis in Water

2019 ◽  
Author(s):  
Subhajit Bhattacharjee ◽  
Sonu Pratap Chaudhary ◽  
Sayan Bhattacharyya
Keyword(s):  
Charge Carrier ◽  
Wide Spectrum ◽  
Real Life ◽  
Metal Halide ◽  
Lead Free ◽  
Water Medium ◽  
Type I ◽  
Type Ii ◽  
Perovskite Layer ◽  
Halide Perovskites

<p>Metal halide perovskites with high absorption coefficient, direct generation of free charge carriers, excellent ambipolar charge carrier transport properties, point-defect tolerance, compositional versatility and solution processability are potentially transforming the photovoltaics and optoelectronics industries. However their limited ambient stability, particularly those of iodide perovskites, obscures their use as photocatalysts especially in aqueous medium. In an unprecedented approach we have exploited the photo-absorption property of the less toxic lead-free Cs<sub>3</sub>Bi<sub>2</sub>X<sub>9 </sub>(X = Br, I) nanocrystals (NCs) to catalyse the degradation of water pollutant organic dye, methylene blue (MB) in presence of visible light at room temperature. After providing a proof-of-concept with bromide perovskites in isopropanol, the perovskites are employed as photocatalysts in water medium by designing perovskite/Ag<sub>2</sub>S and perovskite/TiO<sub>2 </sub>composite systems, with Type I (or quasi Type II) and Type II alignments, respectively. Ag<sub>2</sub>S and TiO<sub>2</sub> coatings decelerate penetration of water into the perovskite layer while facilitating charge carrier extraction. With a minimal NC loading, Cs<sub>3</sub>Bi<sub>2</sub>I<sub>9</sub>/Ag<sub>2</sub>S degrades ~90% MB within an hour. Our approach has the potential to unravel the photocatalytic properties of metal halide perovskites for a wide spectrum of real-life applications. </p>

Epitaxial Metal Halide Perovskites by InkJet Printing

2019 ◽  
Author(s):  
Mykhailo Sytnyk ◽  
Ole Lytken ◽  
Tim Freund ◽  
Wolfgang Heiss ◽  
Christina Harreiss ◽  
...  
Keyword(s):  
Inkjet Printing ◽  
Metal Halide ◽  
Halide Perovskites
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