Photodetectors based on HgTe colloidal quantum dots (CQDs) are expected to enable the next generation of infrared detection technology due to their low-cost preparation, widely tunable absorption, and direct integration with Si-based electronics. However, the fabrication of HgTe CQD photodiode focal plane arrays (FPAs) has been hampered by the creation of rectifying homojunctions through delicate doping modulation and the time-consuming layer-by-layer assembly of the QD photoactive layer. Herein we address these challenges by exploring energetically favored ZnO/HgTe/ZnTe double heterojunctions (DH), and by forming colloidally stable HgTe ink that enables one-step direct film deposition.
View Article and Find Full Text PDFACS Appl Mater Interfaces
December 2023
Lead sulfide (PbS) colloidal quantum dots (CQDs) for photodetectors (PDs) have garnered great attention due to their potential use as low-cost, high-performance, and large-area infrared focal plane arrays. The prevailing device architecture employed for PbS CQD PDs is the -- structure, where PbS CQD films treated with thiol molecules, such as 1,2-ethanedithiol (EDT), are widely used as -type layers due to their favorable band alignment. However, PbS-EDT films face a critical challenge associated with low film quality, resulting in many defects that curtail the device performance.
View Article and Find Full Text PDFTo enhance the efficiency of catalysis, it is crucial to comprehend the behavior of individual nanowires/nanosheets. A developed on-chip microcell facilitates this study by creating a reaction window that exposes the catalyst region of interest. However, this technology's potential application is limited due to frequently-observed variations in data between different cells.
View Article and Find Full Text PDFLead selenide (PbSe) colloidal quantum dots (CQDs) are suitable for the development of the next-generation of photovoltaics (PVs) because of efficient multiple-exciton generation and strong charge coupling ability. To date, the reported high-efficient PbSe CQD PVs use spin-coated zinc oxide (ZnO) as the electron transport layer (ETL). However, it is found that the surface defects of ZnO present a difficulty in completion of passivation, and this impedes the continuous progress of devices.
View Article and Find Full Text PDFTwo-dimensional tin monosulfide (SnS) is attractive for the development of electronic and optoelectronic devices with anisotropic characteristics. However, its shape-controlled synthesis with an atomic thickness and high quality remains challenging. Here, we show that highly crystalline SnS nanoribbons can be produced via high-pressure (0.
View Article and Find Full Text PDFLead selenide (PbSe) colloidal quantum dots (CQDs) are promising candidates for optoelectronic applications. To date, PbSe CQDs capped by halide ligands exhibit improved stability and solar cells using these CQDs as active layers have reported a remarkable power conversion efficiency (PCE) up to 10%. However, PbSe CQDs are more prone to oxidation, requiring delicate control over their processability and compromising their applications.
View Article and Find Full Text PDFThis paper empirically examines the effects of urbanization and income inequality on CO emissions in the BRICS economies (i.e., Brazil, Russia, India, China, and South Africa) during the periods 1994-2013.
View Article and Find Full Text PDFThe hygroscopic properties of aerosol have significant impact on aerosol optical properties, cloud condensation nuclei activity and human health. Aerosol particles growth factor and size-resolved ions chemical compositions were monitored in Mt. Huang.
View Article and Find Full Text PDFThe data of visibility, relative humidity (RH), temperature (T), concentrations and chemical compositions of particles from January to May in 2014 were analyzed to understand the effects of meteorological elements and aerosols on the visibility in north suburb of Nanjing, research the contributions of different aerosol chemical compositions to extinction coefficients and propose the visibility fitting solutions of this region based on different parameters. As the results showed, the average visibility during the observation period was (5.78 ± 3.
View Article and Find Full Text PDFTo understand the effects of relative humidity (RH) and aerosol physicochemical properties on the atmospheric visibility in autumn and winter in northern suburb of Nanjing, the relationships between meteorological elements, particulate matter and visibility were analyzed with the data of meteorological elements, aerosol particle spectra, particulate matter concentration and chemical composition. The average visibility was 4.76 km in autumn and winter in northern suburb of Nanjing.
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