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Enhanced thermal stability of electron transport layer-free perovskite solar cells via interface strain releasing
摘要： The thermal decomposition of perovskite films on ZnO surfaces is generally believed to originate from specific surface states of ZnO and the impact from the lattice mismatch between ZnO and perovskite films on this process has long been ignored. In this research, the role of lattice mismatch in the thermal degradation process of cesium-containing perovskite films on Al doped ZnO (AZO) is studied. A Ba(OH)2 buffer layer on the surface of AZO is employed to release the lattice mismatch and suppress the thermal degradation of perovskite films resulted from ZnO. Consequently, perovskite films with enhanced thermal stability and crystalline properties are obtained. Meanwhile, the Ba(OH)2 films efficiently passivate the surface trap states and reduce the vacuum level of the AZO surfaces. On this basis, electron transport layer-free perovskite solar cells yield the best efficiency of 18.18% and the thermal stability is obviously improved.
关键词： Lattice mismatch,Perovskite solar cell,Electron transport layer-free,Thermal stability
更新于2025-09-16 10:30:52
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AIP Conference Proceedings [AIP Publishing PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019 - Tomsk, Russia (1–5 October 2019)] PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019 - Infrared thermography inspection of severe friction on UFG stainless steel, copper and aluminum alloy
摘要： Friction-generated heat is an important factor that determines the stability of sliding friction conditions and thus has to be taken into account especially when using ultrafine-grained materials for tribological applications. Thermal stability of these materials under friction sliding conditions must be studied and the first approach here is to determine the temperature distributions below the worn surfaces. For this purpose, we used an IR thermal imaging camera attached to a tribological setup and three materials with different heat conductivity values: AISI 321 stainless steel, 5052 aluminum alloy and C11000 copper as specimens. The results show that even if the measured temperatures were below the standard recrystallization start temperatures, the recrystallization still was feasible due to severe friction-induced subsurface deformation.
关键词： Infrared thermography,sliding friction,recrystallization,thermal stability,UFG materials
更新于2025-09-16 10:30:52
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Stable and Higha??Efficiency Methylammoniuma??Free Perovskite Solar Cells
摘要： Organic–inorganic metal halide perovskite solar cells (PSCs) have achieved certified power conversion efficiency (PCE) of 25.2% with complex compositional and bandgap engineering. However, the thermal instability of methylammonium (MA) cation can cause the degradation of the perovskite film, remaining a risk for the long-term stability of the devices. Herein, a unique method is demonstrated to fabricate highly phase-stable perovskite film without MA by introducing cesium chloride (CsCl) in the double cation (Cs, formamidinium) perovskite precursor. Moreover, due to the suboptimal bandgap of bromide (Br?), the amount of Br? is regulated, leading to high power conversion efficiency. As a result, MA-free perovskite solar cells achieve remarkable long-term stability and a PCE of 20.50%, which is one of the best results for MA-free PSCs. Moreover, the unencapsulated device retains about 80% of the original efficiencies after a 1000 h aging study. These results provide a feasible approach to enhance solar cell stability and performance simultaneously, paving the way for commercializing PSCs.
关键词： methylammonium free,perovskite solar cells,lead bromide,thermal stability,cesium chloride
更新于2025-09-16 10:30:52
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Large-Area Organic-Free Perovskite Solar Cells with High Thermal Stability
摘要： Organic-free perovskite solar cells (PSCs) have been considered as the most promising candidate for achieving long-term stability. Here, we demonstrate an organic-free PSC consisting of inorganic CsPbI2Br perovskite, nickel oxide hole transport layer, and niobium oxide electron transport layer. A maximum power conversion efficiency (PCE) of 11.20% is achieved with an active area of 5 cm2, and it increases to 14.11% with smaller area. More importantly, the organic-free PSCs show excellent thermal stability with PCE remaining above 98% of its initial value when heated at 100 °C for 150 min. Postannealing at a proper temperature further increases its maximum PCE to 14.45%, which is the highest among any reported all-inorganic PSCs with a p-i-n structure. The enhanced performance of the postannealed device is ascribed to the decreased trap-state density and improved interface charge-transfer properties. These results demonstrated that this novel organic-free device architecture can be employed to fabricate efficient and stable PSCs for large-scale manufacturing.
关键词： postannealing,CsPbI2Br,large-area,organic-free perovskite solar cells,thermal stability
更新于2025-09-16 10:30:52
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Electro-optically efficient and thermally stable multilayer semitransparent pristine Ag cathode structure for top emission organic light emitting diodes
摘要： To attain high efficiency and stability in a top-emission organic light-emitting diode (TEOLED), the semitransparent metal cathode must have high transmittance, low absorbance, and uniform surface properties under continuous driving conditions. However, conventional semitransparent metal electrodes have numerous fundamental issues. Here, we report an electro-optically efficient and stable semitransparent pristine thin Ag cathode configuration for the high performances of TEOLED. A multilayer semitransparent cathode structure is fabricated by sandwiching a thin silver (Ag) layer between new organic wetting inducer and capping layer, 1,4-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (p-bPPhenB). A thin Ag layer in the presence of p-bPPhenB exhibits superior optical and electrical properties including a high transmittance of 83.8% at 550 nm, low absorbance of 7.65% at 550 nm, and the low sheet resistance of 2.1 Ω/□, respectively, at room temperature and even under 110 OC for 100 hours. It is observed that our organic wetting inducer and capping layer, p-bPPhenB has considerable influence on the stabilization of surface properties of the thin Ag film by forming coordination bond between the Ag atoms and nitrogen atoms of p-bPPhenB through donating unshared electrons to the Ag atom. An optically optimized phosphorescent green TEOLED with this pure Ag cathode configuration enables a low driving voltage of 5.0 V at 10 mA/cm2 and remarkably high maximum current efficiency of about 167 cd/A compared with the Mg:Ag (10:1) cathode (5.4 V and 109 cd/A).
关键词： micro-cavity effect,organic wetting inducer,semitransparent pristine silver cathode,top-emitting organic light emitting diode,thermal stability
更新于2025-09-16 10:30:52
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Star-shaped A-D-A compounds synthesized by different methods and used as donor or acceptor materials in organic photovoltaics
摘要： Star-shaped small molecule has lots of fascinating advantages compare with the linear small molecule. In this paper, two star-shaped small-molecules (S-TT and S-TT-R) with vinyl trithiophene with or without alkyl substituents as core, N-ethyl- rhodanine as terminal and withdrawing groups, vinyl as bridge group were synthesized by different synthetic routes. Both of the two materials demonstrate high thermal stability and broad absorption. Both S-TT and S-TT-R exhibit narrow bandgap (1.72 and 1.82 eV), low LUMO energy levels (? 3.92 eV) for S-TT and high HOMO energy levels (? 5.37 eV) for S-TT-R which could be applied as acceptor or donor materials for photovoltaics, respectively. Both of the two compounds were used as donor materials with PC61BM acceptor and S-TT were used as acceptor material with P3HT donor.
关键词： Absorption,Star-shaped small molecule,Organic photovoltaics,Acceptor materials,Thermal stability,Donor materials
更新于2025-09-16 10:30:52
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Novel orange–red emitting phosphor Sr8ZnY(PO4)7:Sm3+ with enhanced emission based on Mg2+ and Al3+ incorporation for plant growth LED lighting
摘要： In this paper, a series of novel orange-red emission phosphors Sr8ZnY(PO4)7:Sm3+ (SZYP:Sm3+) were synthesized by high-temperature solid-state reaction. The photoluminescence and concentration-dependent properties of this phosphor were investigated carefully through diffuse reflection spectra, excitation and emission spectra, Commission Internationale de l’éclairage (CIE) chromaticity coordinate and decay times. SZYP:Sm3+ could be efficiently excited by n-UV and blue lights which center at 318, 345, 363, 376, 401, 410, 440 and 475 nm, respectively. The characteristic orange-red emission peaking at 563, 601 and 647 nm had been detected, which should be attributed to the characteristic f–f forbidden transition of Sm3+. The internal quantum efficiency (IQE) of ideal phosphor of SZYP:0.09Sm3+ reached as high as 47%. In addition, The concentration quenching mechanism and thermal stability of SZYP:Sm3+ were further investigated. It was found SZYP:Sm3+ can maintain 93% of initial emission intensity at 150 °C and the corresponding activation energy was calculated to be 0.26 eV based on Arrhenius formula. The emission intensity of 1.0Mg2+ incorporated SZYP:0.09Sm3+ and 0.02Al3+ reached up to 134% and 117% of the initial value, respectively. Moreover, (light-emitting diodes) LED devices were fabricated by employing the optimized samples as orange-red component with 365 nm n-UV chips. The desired emission in plant absorption region and extremely high thermal stability imply that SZYP:Sm3+ is suitable for the application in plant growth LED lighting.
关键词： Thermal stability,Sm3+,Plant growth lighting,Phosphors
更新于2025-09-16 10:30:52
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Simultaneous enhanced efficiency and thermal stability in organic solar cells from a polymer acceptor additive
摘要： The thermal stability of organic solar cells is critical for practical applications of this emerging technology. Thus, effective approaches and strategies need to be found to alleviate their inherent thermal instability. Here, we show a polymer acceptor-doping general strategy and report a thermally stable bulk heterojunction photovoltaic system, which exhibits an improved power conversion efficiency of 15.10%. Supported by statistical analyses of device degradation data, and morphological characteristics and physical mechanisms study, this polymer-doping blend shows a longer lifetime, nearly keeping its efficiency (t = 800 h) under accelerated aging tests at 150 oC. Further analysis of the degradation behaviors indicates a bright future of this system in outer space applications. Notably, the use of polymer acceptor as a dual function additive in the other four photovoltaic systems was also confirmed, demonstrating the good generality of this polymer-doping strategy.
关键词： polymer acceptor,power conversion efficiency,bulk heterojunction,organic solar cells,thermal stability
更新于2025-09-16 10:30:52
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Introduction of a bifunctional cation affords perovskite solar cells stable at temperatures exceeding 80°C
摘要： Perovskite solar cells (PSCs) with high efficiencies have been reported in recent years. Consequently, the main obstacle that hinders their commercialization is their poor thermal stability. Here, we describe the introduction of an A-site cation (2-choloroethylammonium) that affords an ABX3 perovskite, which is stable at high temperatures (> 80°C) while achieving efficiencies > 19% in methylammonium lead iodide (MAPI)-based PSCs.
关键词： perovskite solar cells,efficiency,high temperatures,bifunctional cation,thermal stability
更新于2025-09-12 10:27:22
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Inorganic halide perovskite materials and solar cells
摘要： Organic-inorganic perovskite solar cells (PSCs) have achieved an inspiring third-party-certificated power conversion efficiency (PCE) of 25.2%, which is comparable with commercialized silicon (Si) and copper indium gallium selenium solar cells. However, their notorious instability, including their deterioration at elevated temperature, is still a serious issue in commercial applications. This thermal instability can be ascribed to the high volatility and reactivity of organic compounds. As a result, solar cells based on inorganic perovskite materials have drawn tremendous attention, owing to their excellent stability against thermal stress. In the last few years, PSCs based on inorganic perovskite materials have seen an astonishing development. In particular, CsPbI3 and CsPbI2Br PSCs demonstrated outstanding PCEs, exceeding 18% and 16%, respectively. In this review, we systematically discuss the properties of inorganic perovskite materials and the device configuration of inorganic PSCs as well as review the progress in PCE and stability. Encouragingly, all-inorganic PSCs, in which all functional layers are inorganic, provide a feasible approach to overcome the thermal instability issue of traditional organic-inorganic PSCs, leading to new perspectives toward commercial production of PSCs.
关键词： inorganic halide perovskite,solar cells,thermal stability,power conversion efficiency,all-inorganic PSCs
更新于2025-09-12 10:27:22