Air-stable Artificial Synapse Based on Lead-free Double Perovskite Cs2AgBiBr6 Film for Neuromorphic Computing

2021 ◽  
Author(s):  
Jie Lao ◽  
Wen Xu ◽  
Chunli Jiang ◽  
Ni Zhong ◽  
Bobo Tian ◽  
...  
Keyword(s):  
Nonvolatile Memory ◽  
Double Perovskite ◽  
Lead Free ◽  
Neuromorphic Computing ◽  
Artificial Synapse ◽  
Halide Perovskites

Halide perovskites (HPs) are promising materials for preparing nonvolatile memory and artificial synapse devices. However, the instability and toxicity of lead HPs seriously restrict their further application. Herein, a lead-free...

scholarly journals Magnetizing lead-free halide double perovskites

2020 ◽  
Vol 6 (45) ◽  
pp. eabb5381
Author(s):  
Weihua Ning ◽  
Jinke Bao ◽  
Yuttapoom Puttisong ◽  
Fabrizo Moro ◽  
Libor Kobera ◽  
...  
Keyword(s):  
High Speed ◽  
Double Perovskite ◽  
Lead Free ◽  
Great Success ◽  
Double Perovskites ◽  
Temperature Dependent ◽  
Magnetic Elements ◽  
Halide Perovskites ◽  
New Generation ◽  
Further Development

Spintronics holds great potential for next-generation high-speed and low–power consumption information technology. Recently, lead halide perovskites (LHPs), which have gained great success in optoelectronics, also show interesting magnetic properties. However, the spin-related properties in LHPs originate from the spin-orbit coupling of Pb, limiting further development of these materials in spintronics. Here, we demonstrate a new generation of halide perovskites, by alloying magnetic elements into optoelectronic double perovskites, which provide rich chemical and structural diversities to host different magnetic elements. In our iron-alloyed double perovskite, Cs2Ag(Bi:Fe)Br6, Fe3+ replaces Bi3+ and forms FeBr6 clusters that homogenously distribute throughout the double perovskite crystals. We observe a strong temperature-dependent magnetic response at temperatures below 30 K, which is tentatively attributed to a weak ferromagnetic or antiferromagnetic response from localized regions. We anticipate that this work will stimulate future efforts in exploring this simple yet efficient approach to develop new spintronic materials based on lead-free double perovskites.

Pressure-Induced Bandgap Engineering of Lead-Free Halide Double Perovskite (NH4)2SnBr6

2021 ◽  
Author(s):  
Jiaxiang Wang ◽  
Lingrui Wang ◽  
Fei Wang ◽  
Sheng Jiang ◽  
Haizhong Guo
Keyword(s):  
Double Perovskite ◽  
Vital Role ◽  
Lead Free ◽  
Double Perovskites ◽  
Bandgap Engineering ◽  
Environmental Friendly ◽  
Halide Perovskites ◽  
Optoelectronic Applications

Lead-free halide double perovskites (HDPs) have recently been proposed as potential stable and environmental-friendly alternatives to lead-based halide perovskites. Bandgap engineering plays a vital role in optoelectronic applications of HDP...

scholarly journals A reversible and fast-responsive humidity sensor based on a lead-free Cs2TeCl6 double perovskite

2021 ◽  
Vol 2 (3) ◽  
pp. 1043-1049
Author(s):  
Chaojie Pi ◽  
Xue Yu ◽  
Weiqing Chen ◽  
Liuli Yang ◽  
Chao Wang ◽  
...  
Keyword(s):  
Carrier Mobility ◽  
Humidity Sensor ◽  
Double Perovskite ◽  
High Conductivity ◽  
Lead Free ◽  
Sensor Applications ◽  
Halide Perovskites ◽  
Lead Halide

Owing to their high conductivity and carrier mobility, the outstanding achievements of lead halide perovskites have been demonstrated in humidity sensor applications.

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>

Highly Emissive Halide Perovskite Nanocrystals: From Lead to Lead-Free

CrystEngComm ◽  
2021 ◽  
Author(s):  
Chunlong Li ◽  
Jie Li ◽  
Zhengping Li ◽  
Huayong Zhang ◽  
Yangyang Dang ◽  
...  
Keyword(s):  
Charge Carriers ◽  
Lead Free ◽  
Quantum Yields ◽  
Local Management ◽  
Perovskite Nanocrystals ◽  
Halide Perovskites ◽  
Halide Perovskite

Nanostructured halide perovskites have highly yielded record LEDs due to their higher versatility in the local management of charge carriers, which has enabled photoluminescence quantum yields (PLQYs) close to 100%....

Ferroelectric polymer-based artificial synapse for neuromorphic computing

2021 ◽  
Author(s):  
Sungjun Kim ◽  
Keun Heo ◽  
Sunghun Lee ◽  
Seunghwan Seo ◽  
Hyeongjun Kim ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistor ◽  
Neuromorphic Computing ◽  
Ferroelectric Polymer ◽  
Artificial Synapse ◽  
Effect Transistor

Recently, various efforts have been made to implement synaptic characteristics with a ferroelectric field-effect transistor (FeFET), but in-depth physical analyses have not been reported thus far.

Precursor engineering for high-quality Cs2AgBiBr6 films toward efficient lead-free double perovskite solar cells

2021 ◽  
Author(s):  
Ping Hou ◽  
Wenxiang Yang ◽  
Ning Wan ◽  
Zhi Fang ◽  
Jinju Zheng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Control Sample ◽  
Double Perovskite ◽  
Lead Free ◽  
High Quality ◽  
Precursor Engineering ◽  
First Time

We report a facile BiBr3(DMSO)2 adduct process to produce high-quality Cs2AgBiBr6 films with large grains for the first time, which leads to an enhancement of over 40% on the PCE of Cs2AgBiBr6-based solar cells compared to that of the control sample.

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