Effect of molybdenum on grain boundary segregation in Incoloy 901 superalloy

Tavakkoli, Mehdi; Abbasi, S.M.

doi:10.1016/j.matdes.2012.11.002

Cited by 21 publications

(12 citation statements)

References 19 publications

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“…[22][23][24] These features could accelerate the transportation of photogenerated electrons, resulting in efficient and hysteresis-free PSC devices. However, ZnO-based PSCs suffer from the unwanted reaction between ZnO and perovskite layers, happening during the annealing of the perovskite at 100 C. [25][26][27][28][29][30] This issue needs to be addressed for the fabrication of efficient and stable PSCs. In the literature, several strategies have been employed to solve this problem for example, synthesis of a new nanocomposite based on ZnO, applying an interfacial layer as a barrier between ZnO and the perovskite layer, and passivation of the ZnO lm.…”

Section: Introductionmentioning

confidence: 99%

A graphene/ZnO electron transfer layer together with perovskite passivation enables highly efficient and stable perovskite solar cells

et al. 2019

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Section: Introductionmentioning

confidence: 99%

A graphene/ZnO electron transfer layer together with perovskite passivation enables highly efficient and stable perovskite solar cells

et al. 2019

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“…In these hybrid nanostructures, graphene is an efficient and fast charge extraction layer . In our previous works, we fabricated hybrid nanostructures of PbS quantum dots (QDs) and graphene and employed them as an absorber layer in quantum dot solar cells and improved the performance of the device by up to 40% . Wang et al also demonstrated that the hybrid nanostructure of graphene and TiO 2 NPs can improve the device performance of a perovskite solar cell up to 15.6%.…”

Section: Introductionmentioning

confidence: 99%

High Efficiency and Stable Perovskite Solar Cell Using ZnO/rGO QDs as an Electron Transfer Layer

Tavakoli

Nourbakhsh

et al. 2016

Adv Materials Inter

150

123

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power conversion effi ciency (PCE) more than 20% has been achieved using a solution process. [6][7][8][9][10] Among the different processes for fabrication of perovskite solar cells, including one-step solution process, [ 11,12 ] sequential deposition, [ 13,14 ] vacuum deposition, [ 15 ] and chemical vapor deposition, [ 16 ] a two-step solution process has benefi ts such as good control of the crystal structure for perovskite fi lm. [ 17 ] In order to fabricate perovskite solar cells, different types of electron transfer layers (ETLs) and hole transfer layers (HTLs) have been employed. Among them, a conducting polymer such as poly(3,4-ethylenedioxythiophene):polystyr enesulfonate (PEDOT:PSS) is commonly used as the HTL in perovskite solar cells. However, the high acidity of this polymer deteriorates the ITO layer, and its high hygroscopicity can also accelerate degradation of the device due to water absorption. [ 18 ] Recently, many research groups have focused on inorganic materials that can work as an HTL, such as CuSCN and NiO. [19][20][21] Regarding the ETL materials, more stable metal oxides, such as titanium dioxide (TiO 2 ), zinc oxide (ZnO), and tin oxide (SnO 2 ) have been developed for perovskite solar cells. [ 22 ] Among these metal oxides, TiO 2 -nanoparticles (NPs) have been commonly used as the ETL to provide an effi cient charge collection. [ 23 ] In order to prepare a TiO 2 mesoporous layer, a sintering process with high temperature (≈500 °C) is required. [ 18 ] This temperature is too high for fabrication of perovskite on plastic substrate. In addition, few groups already have reported ETL-free perovskite solar cell with descent PCE on plastic substrates; however, their PCE is not comparable with those devices fabricated on rigid substrates.ZnO NPs are, therefore, a promising candidate to replace TiO 2 NPs as the ETL layer in perovskite solar cells. However, only a few works have reported perovskite solar cells based on ZnO NPs. Intriguingly, the devices on ZnO NPs show a maximum PCE of close to 15.7%, [ 24 ] which is lower than those on TiO 2 NPs. To fabricate the device on ZnO NPs, a twostep solution process is usually employed. Depending on the annealing temperature (70 °C-100 °C) of the perovskite fi lm, different works have reported a device performance from 8.9% to 15.7%. [24][25][26][27] In addition, a few works have demonstrated the instability of perovskite materials on top of ZnO NPs due to Fabrication of organohalide perovskite materials on the top of ZnO nanoparticles (NPs) has some benefi cial advantages such as room temperature processing; however, the perovskite is not stable on ZnO NPs layer during the annealing process. In fact, there are only a few reports about the fabrication of perovskite solar cells on ZnO NPs layer. Herein, the decomposition mechanism of CH 3 NH 3 PbI 3 perovskite materials on ZnO is reported, and it is found that the perovskite fi lm on the top of the ZnO layer is converted into PbI 2 during the annealing process due to the existence of hydroxide groups on...

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“…One of the most popular austenitic heat-resistant superalloy is Incoloy 901 which has widespread uses for parts such as turbine disks, shafts and rotors and requires high strength of up to 760°C and oxidation resistance of up to 870°C [1][2][3][4]. Therefore, research interest to improve the performance characteristics of Incoloy 901 is going on [5,6]. The precipitation hardening process applied for these alloys gives rise to interesting mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Carbon Content on the Microstructure and 650°C Tensile Properties of Incoloy 901 Superalloy

Dodangeh

Shahri

Abbasi

2015

High Temperature Materials and Processes

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The microstructure and tensile properties of Incoloy 901 superalloy with various contents of carbon (0.02-0.09 wt%) were studied and a proper amount of carbon was determined to achieve good tensile properties at 650°C. The alloys were produced by vacuum induction melting and electro-slag refining (VIM þ ESR) process and then they were hot rolled. After heat treatment, microstructures and 650°C tensile properties of specimens were investigated. Phase analysis with X-ray diffraction (XRD) indicated that Incoloy 901 contained Metallic carbides (MC)-type carbide enriched with Ti and Mo. With increasing carbon content from 0.02 to 0.09 wt%, carbide area fraction increased from 0.73% to 1.2%. Also, increasing of carbon content gave rise to higher amounts of carbide sizes. Using XRD patterns, the lattice parameters of γ and γ′ phases were determined and the results showed that, with increase of carbon content, the lattice parameters of γ and γ′ phases decreased and the mismatch between them increased from 0.119% for alloy containing 0.02 wt% to 0.167% for alloy containing 0.09 wt% C. The maximum strength of the alloy was obtained at 0.05 wt% carbon and ductility decreased slightly with increasing carbon.

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Effect of molybdenum on grain boundary segregation in Incoloy 901 superalloy

Cited by 21 publications

References 19 publications

A graphene/ZnO electron transfer layer together with perovskite passivation enables highly efficient and stable perovskite solar cells

A graphene/ZnO electron transfer layer together with perovskite passivation enables highly efficient and stable perovskite solar cells

High Efficiency and Stable Perovskite Solar Cell Using ZnO/rGO QDs as an Electron Transfer Layer

The Effects of Carbon Content on the Microstructure and 650°C Tensile Properties of Incoloy 901 Superalloy

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