scholarly journals Origin of Sn(ii) oxidation in tin halide perovskites

2020 ◽  
Vol 1 (5) ◽  
pp. 1066-1070
Author(s):  
Jorge Pascual ◽  
Giuseppe Nasti ◽  
Mahmoud H. Aldamasy ◽  
Joel A. Smith ◽  
Marion Flatken ◽  
...  
Keyword(s):  
Photovoltaic Materials ◽  
Halide Perovskites

Tin-halide perovskites have great potential as photovoltaic materials, but their performance is hampered by undesirable oxidation of Sn(ii) to Sn(iv). NMR proves DMSO to be a main cause of oxidation.

scholarly journals Understanding liquefaction in halide perovskites upon methylamine gas exposure

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20423-20428
Author(s):  
Wencai Zhou ◽  
Zilong Zheng ◽  
Yue Lu ◽  
Manling Sui ◽  
Jun Yin ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Power ◽  
Photovoltaic Materials ◽  
Halide Perovskites ◽  
Gas Exposure

Methylamine (CH3NH2, MA) gas-induced fabrication of organometal CH3NH3PbI3 based perovskite thin films are promising photovoltaic materials that transform the energy from absorbed sunlight into electrical power.

scholarly journals Enhanced control of self-doping in halide perovskites for improved thermoelectric performance

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Tianjun Liu ◽  
Xiaoming Zhao ◽  
Jianwei Li ◽  
Zilu Liu ◽  
Fabiola Liscio ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Surface Layer ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Sacrificial Layer ◽  
Fine Tuning ◽  
Photovoltaic Materials ◽  
Chlorine Doping ◽  
Halide Perovskites ◽  
Transport Region

AbstractMetal halide perovskites have emerged as promising photovoltaic materials, but, despite ultralow thermal conductivity, progress on developing them for thermoelectrics has been limited. Here, we report the thermoelectric properties of all-inorganic tin based perovskites with enhanced air stability. Fine tuning the thermoelectric properties of the films is achieved by self-doping through the oxidation of tin (ΙΙ) to tin (ΙV) in a thin surface-layer that transfers charge to the bulk. This separates the doping defects from the transport region, enabling enhanced electrical conductivity. We show that this arises due to a chlorine-rich surface layer that acts simultaneously as the source of free charges and a sacrificial layer protecting the bulk from oxidation. Moreover, we achieve a figure-of-merit (ZT) of 0.14 ± 0.01 when chlorine-doping and degree of the oxidation are optimised in tandem.

Perovskites for photovoltaics: a combined review of organic–inorganic halide perovskites and ferroelectric oxide perovskites

2015 ◽  
Vol 3 (37) ◽  
pp. 18809-18828 ◽  
Author(s):  
Zhen Fan ◽  
Kuan Sun ◽  
John Wang
Keyword(s):  
Photovoltaic Materials ◽  
Halide Perovskites ◽  
Ferroelectric Oxide

This review compares organic–inorganic halide perovskites and ferroelectric oxide perovskites, both of which are emerging as new promising photovoltaic materials.

scholarly journals Ethylammonium as an alternative cation for efficient perovskite solar cells from first-principles calculations

RSC Advances ◽  
2019 ◽  
Vol 9 (13) ◽  
pp. 7356-7361 ◽  
Author(s):  
Diwen Liu ◽  
Qiaohong Li ◽  
Kechen Wu
Keyword(s):  
Solar Cells ◽  
First Principles ◽  
Perovskite Solar Cells ◽  
First Principles Calculations ◽  
New Class ◽  
Photovoltaic Materials ◽  
Mixed Cation ◽  
Halide Perovskites ◽  
Lead Halide

Mixed-cation lead halide perovskites have emerged as a new class of promising photovoltaic materials for perovskite solar cells.

scholarly journals Halide perovskites: third generation photovoltaic materials empowered by metavalent bonding

2020 ◽  
Author(s):  
Matthias Wuttig ◽  
Carl-Friedrich Schön ◽  
Mathias Schumacher ◽  
John Robertson ◽  
Pavlo Golub ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Charge Carrier Mobility ◽  
Third Generation ◽  
Covalent Bonds ◽  
Effective Masses ◽  
Photovoltaic Materials ◽  
Halide Perovskites ◽  
Lattice Distortions ◽  
High Optical Absorption ◽  
Large Charge

Abstract Third-generation photovoltaic (PV) materials combine many advantageous properties, including a high optical absorption together with a large charge carrier mobility, facilitated by small effective masses. Halide perovskites (ABX3, where X = I, Br or Cl) appear to be the most promising third-generation PV materials at present. Their opto-electronic properties are governed by the B-X bond. A quantum-chemical bond analysis reveals that this bond differs significantly from ionic, metallic or covalent bonds. Instead, it is better regarded as metavalent, since it shares approximately one p-electron between adjacent atoms. The resulting s–bond is half-filled, which causes pronounced optical absorption. Electron transfer and lattice distortions open a moderate band gap, resulting in charge carriers with small effective masses. Hence metavalent bonding explains the favorable PV properties of halide perovskites. This is summarized in a map for different bond types, which provides a blueprint to design third-generation PV materials.

scholarly journals Structural Damage of Two-Dimensional Organic–Inorganic Halide Perovskites

Inorganics ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 13
Author(s):  
Biao Yuan ◽  
Enzheng Shi ◽  
Chao Liang ◽  
Letian Dou ◽  
Yi Yu
Keyword(s):  
Structural Damage ◽  
Structural Evolution ◽  
Liquid Nitrogen Temperature ◽  
High Energy ◽  
Structural Instability ◽  
Moist Air ◽  
Perovskite Materials ◽  
Photovoltaic Materials ◽  
Transmission Electron ◽  
Halide Perovskites

Organic–inorganic halide perovskites are promising photovoltaic materials with excellent optoelectronic properties. However, the extreme structural instability hinders their wide application as well as the microstructure characterization using high energy beams such as transmission electron microscopy (TEM). Here, taking BA2FAPb2I7 and BA2MAPb2I7 as examples, we investigate their structural evolution resulting from high energy electron irradiation, moist air, and low temperature, respectively. The results show that the long organic chains are the first to be damaged under electron beam, which is mainly arising from their instability and weak bonding with the framework of [PbI6]4− octahedrons. Then the short organic cations and the framework of [PbI6]4− octahedrons collapses gradually. The final products are clusters of detached PbI2 particles, which can also be observed in the sample degraded in moist air. In addition, the structures of BA2FAPb2I7 and BA2MAPb2I7 are discovered to undergo a phase transformation at liquid nitrogen temperature, which calls attention to the community that cryo-TEM methods should be used cautiously for organic–inorganic halide perovskite materials.

THERMAL TRANSPORT BEHAVIORS IN LEAD HALIDE PEROVSKITES

2018 ◽  
Author(s):  
Wee-Liat Ong ◽  
Giselle Elbaz ◽  
Evan A. Doud ◽  
Philip Kim ◽  
Daniel Paley ◽  
...  
Keyword(s):  
Thermal Transport ◽  
Halide Perovskites ◽  
Lead Halide

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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