- 标题
- 摘要
- 关键词
- 实验方案
- 产品
过滤筛选
- 2019
- low-temperature electronics
- junction field-effect transistors
- differential operational amplifier
- LTspice environment
- differential stage
- common-mode rejection ratio
- class AB operation
- optimization of analog electronic circuit
- operational amplifier
- LTspice environment
- Electronic Science and Technology
- Don State Technical University
- Southern Federal University
-
1000 h Operational Lifetime Perovskite Solar Cells by Ambient Melting Encapsulation
摘要： Improving device lifetime is one of the critical challenges for the practical use of metal halide perovskite solar cells (PSCs), wherein a reliable encapsulation is indispensable. Herein, based on an in-depth understanding of the degradation mechanism for the PSCs, a solvent-free and low-temperature melting encapsulation technique, by employing low-cost paraffin as the encapsulant that is compatible with perovskite absorbers, is demonstrated. The encapsulation strategy enables the full encapsulating operations to be undertaken under an ambient environment. It is found that the strategy not only removes residual oxygen and moisture to prevent the perovskite from phase segregation, but also suppresses the species volatilization to impede absorber decomposition, enabling a PSC devices with good thermal and moisture stability. As a result, the as-encapsulated PSCs achieve a 1000 h operational lifetime for the encapsulated device at continuous maximum power point output under an ambient environment. This work paves the way for scalable and robust encapsulation strategy feasible to hybrid perovskite optoelectronics in an economic manner.
关键词： stability,perovskite solar cells,solvent-free,ambient encapsulation,low-temperature
更新于2025-09-16 10:30:52
-
High Performance Flexible Transparent Electrode via Onea??Step Multifunctional Treatment for Ag Nanonetwork Composites Semia??Embedded in Lowa??Temperaturea??Processed Substrate for Highly Performed Organic Photovoltaics
摘要： For ideal flexible transparent electrodes, the features of good electrical/optical properties, low surface roughness, efficient charge transportation, robust electrical stability under simultaneously continuous operation bias, and mechanical bending are critical. Herein, a flexible transparent electrode fulfilling all these features is demonstrated by silver (Ag) nanonetwork composites semi-embedded in low-temperature-processed colorless polyimide (cPI), which shows a figure of merit over 1000 (5.4 Ω sq?1 sheet resistance and >94% diffused transmission at 550 nm wavelength), extremely smooth topography (<1 nm root-mean-square roughness and <3 nm peak-to-valley roughness), remarkable bending stability under continuous operation bias, and increased work function favoring the band alignment with typical charge transport layers for efficient devices. These characteristics are attributed to one-step multifunctional chemical treatment on the composite of Ag nanowires and an example polymer of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS). The strategic one-step process simultaneously offers selective welding at nanowires cross junctions to form an Ag nanonetwork, and removing polyvinylpyrrolidone surfactant from Ag nanowires and PSS from PEDOT:PSS. The flexible electrode also favors the residue-free cPI transfer for applications. Flexible organic solar cells (OSCs) made from the electrode achieve an averaged power conversion efficiency of 14.46% (best, 15.12%), which is the best flexible OSCs reported so far.
关键词： low-temperature substrates,silver nanonetworks,organic solar cells,chemical treatment,flexible transparent electrodes
更新于2025-09-16 10:30:52
-
Quantitative measurements of formaldehyde in the low-temperature oxidation of iso-octane using mid-infrared absorption spectroscopy
摘要： Time-resolved quantitative measurements of formaldehyde (HCHO) in the low-temperature oxidation of iso-octane using a rapid compression machine have been performed with mid-infrared laser absorption spectroscopy. Due to the weak interference of the broadband absorption of iso-octane, a two-color detection scheme was applied to HCHO detection. The cross-sections of HCHO and iso-octane in two colors were measured using the rapid compression machine in the temperature range of 450–737 K and pressure range of 100–700 kPa. The time-resolved quantitative HCHO profiles in the low-temperature oxidation of iso-octane at 0.77 MPa, 645 K, and an equivalence ratio of 1.0 were successfully obtained. The calculated HCHO profiles using the latest chemical kinetic model of iso-octane show the same tendency as the experimental profiles.
关键词： formaldehyde,mid-infrared absorption spectroscopy,iso-octane,low-temperature oxidation,rapid compression machine
更新于2025-09-16 10:30:52
-
High Electron Affinity Enables Fast Hole Extraction for Efficient Flexible Inverted Perovskite Solar Cells
摘要： Inverted perovskite solar cells (PSCs) with low-temperature processed hole transporting materials (HTMs) suffer from poor performance due to the inferior hole-extraction capability at the HTM/perovskite interfaces. Here, molecules with controlled electron affinity enable a HTM with conductivity improved by more than ten times and a decreased energy gap between the Fermi level and the valence band from 0.60 to 0.24 eV, leading to the enhancement of hole-extraction capacity by five times. As a result, the 3,6-difluoro-2,5,7,7,8,8-hexacyanoquinodimethane molecules are used for the first time enhancing open-circuit voltage (Voc) and fill factor (FF) of the PSCs, which enable rigid-and flexible-based inverted perovskite devices achieving highest power conversion efficiencies of 22.13% and 20.01%, respectively. This new method significantly enhances the Voc and FF of the PSCs, which can be widely combined with HTMs based on not only NiOx but also PTAA, PEDOTT:PSS, and CuSCN, providing a new way of realizing efficient inverted PSCs.
关键词： hole transport materials,perovskite solar cells,low-temperature processed
更新于2025-09-16 10:30:52
-
Higha??Efficiency Lowa??Temperaturea??Processed Mesoscopic Perovskite Solar Cells from SnO <sub/>2</sub> Nanorod Selfa??Assembled Microspheres
摘要： Mesoporous scaffolds in perovskite solar cells (PSCs) can accelerate the formation of heterogeneous nucleation sites, leading to enhanced quality of perovskite films and uniform perovskite coverage over large areas. Nevertheless, the mesoporous electron transport layers (ETLs) can effectively compensate for the drawback of shorter electron diffusion lengths than their hole counterparts. Therefore, most mesoscopic PSCs usually show superior photovoltaic performance to their planar counterparts. However, mesoporous ETLs, particularly those prepared with metal oxide nanocrystals, often require a high-temperature sintering process for the removal of residual organics and the improved crystallization of metal oxides. Here, a novel emulsion-based bottom-up self-assembly strategy is used to prepare sizable SnO2 microspheres from oleic acid capped SnO2 nanorods. Combined with an in-situ ligand-stripping strategy, the low-temperature solution-processed mesoscopic PSCs can achieve efficiency as high as 21.35% with slight hysteresis and good reproducibility. In particular, the emulsion-based bottom-up self-assembly strategy is a general way for preparing microspheres from several kinds of semiconductor nanocrystals, so it will greatly expand the material selection range for preparing efficient mesoscopic PSCs and even inverted mesoscopic devices.
关键词： mesoscopic perovskite solar cells,in situ ligand stripping,low-temperature process,SnO2 nanorod self-assembled microspheres
更新于2025-09-16 10:30:52
-
Solar Engineering of Thermal Processes, Photovoltaics and Wind || Solar Industrial Process Heat
摘要： Very large amounts of energy are used for low-temperature process heat in industry, for such diverse applications as drying of lumber or food, cleaning in food processing, extraction operations in metallurgical or chemical processing, cooking, curing of masonry products, paint drying, and many others. Temperatures for these applications can range from near ambient to those corresponding to low-pressure steam, and energy can be provided from flat-plate collectors or concentrating collectors of low concentration ratios.
关键词： flat-plate collectors,low-temperature process,solar energy,concentrating collectors,industrial process heat
更新于2025-09-16 10:30:52
-
Influence of baking temperature on relevant properties of sol-gel Ga-doped ZnO thin films annealed at low temperature
摘要： Ga-doped ZnO(GZO) transparent thin films were grown onto glass substrates by sol-gel based spin coating process. After each coating, the as-deposited film was thermally baked at different moderate temperatures ranging from 100°C to 250°C followed by calcinations at certain temperature lower than 400°C. Characterization were conducted on calcined samples using scanning electron microscope (SEM), X-ray diffraction (XRD), optical spectroscopy and Fourier transform infrared spectroscopy (FTIR). The influence of baking temperature on crucial properties including structural, morphological and optical properties of Ga-doped ZnO transparent thin films were extensively investigated. XRD patterns exhibited typical polycrystalline of hexagonal wurtzite structure of as-deposited thin films and baking temperature is considered as one of essential key parameters affecting the crucial properties of the prepared films.
关键词： Low temperature annealing,Ga-doped ZnO,Baking temperature,Spin coating
更新于2025-09-12 10:27:22
-
Improve the Oxide/Perovskite Heterojunction Contact for Low Temperature High Efficiency and Stable All-inorganic CsPbI2Br Perovskite Solar Cells
摘要： Oxide/perovskite heterojunction contact is important for realizing high performance and stable perovskite solar cells (PSCs). However, the development of ZnO/perovskite heterojunction contact is plagued by the poor chemical compatibility at ZnO/organic-inorganic perovskite interface. Nevertheless, the ZnO/inorganic perovskite heterojunction contact exhibits potential applications in all-inorganic PSCs. In this study, all-inorganic CsPbI2Br PSCs based on ZnO/perovskite heterojunction contact have been successfully realized at low temperature process below 150 oC and delivered an excellent power efficiency conversion of 14.78 % with a high open-circuit voltage (Voc) of 1.21 V and a truly extraordinary fill factor (FF) of 81.42 %. Compared to SnO2-based PSCs, the better band alignment between ZnO ETL and perovskite contributed larger built-in potential, resulting in superior electron extraction capability and effective interfacial recombination suppression. The better perovskite film quality and improved interface contact of ETL/perovskite contributed to better air and thermal stability of ZnO-based perovskite devices. These researches have proved the unlimited possibilities for ZnO as ETL in all-inorganic perovskite solar cells.
关键词： ZnO,low temperature,interface,all-inorganic CsPbI2Br,electron transport layer
更新于2025-09-12 10:27:22
-
Enhancing the charge extraction and stability of perovskite solar cells using strontium titanate (SrTiO3) electron transport layer
摘要： Charge transport layers strongly influence the performance of perovskite solar cells (PSCs). To date, compact layers and mesoporous scaffolds of titanium dioxide have emerged as good electron transport layers (ETL), enabling record power conversion efficiencies (PCE). However, these ETLs require sintering above 400 °C, which excludes them from low-temperature applications such as flexible devices and silicon-heterojunction tandems. Furthermore, instability of TiO2 under prolonged exposure to sun light appears to be a critical issue. Here, we present the promising characteristics of low-temperature processed strontium titanate (STO) as an ETL to realize PSCs with 19% PCE. STO is a wide bandgap transparent inorganic perovskite. Compared to other low-temperature processed interlayers, STO reduces the parasitic absorption in the ultraviolet and visible range, improves the electron transport and greatly increases the stability of the devices, retaining ~80% of their initial efficiency after 1000 hours of constant white light illumination.
关键词： perovskite solar cells,stability,low-temperature processing,strontium titanate,electron transport layer
更新于2025-09-12 10:27:22
-
Dual-surface lens with ring-shaped structures for optical tuning of GaN ultraviolet photodetectors at low temperature
摘要： This study aims to enhance the optical sensitivity of gallium nitride ultraviolet (UV) photodetectors at low temperatures using a multifunctional microlens with ring-shaped structures. This dual-surface lens with ring-shaped structures (i.e., DSLR), a unique microlens, was fabricated by employing a curable polymer and three-dimensional printed mold, and it has two primary regions: An upper and a lower region. The upper region of the DSLR serves as a smooth lens surface to focus the incident UV rays by delaying frost formation at low temperatures. The lower region captures condensed water droplets, thus allowing for only local frost formation. When compared to a photodetector without the DSLR, the photodetector covered by the DSLR generated a higher photocurrent at low temperatures (corresponding to a ~13.85% increase in generated photocurrent in the temperature range of -20°C to -1.2°C). Thus, the findings of this study support the use of a facile, cost-effective, and multifunctional dual-surface polymer lens for higher-sensitivity UV detection in various low-temperature environments, such as the Arctic, outer space, and the environment within cryostats.
关键词： Photodetector,Dual-surface,Gallium nitride,Ring-shaped structures,Low temperature,Microlens
更新于2025-09-12 10:27:22