Enhanced stability and efficiency in perovskite solar cells via mixed-metal chalcohalide-alloyed formamidinium lead iodide.

Achieving long-term stability in halide perovskite solar cells (PSCs) remains challenging due to their susceptibility to environmental degradation. Enhancing material stability at the intrinsic level offers a pathway to more durable solutions. This study addresses the instability of halide perovskites by enhancing ionic binding energy and alleviating lattice strain through the mixed metal chalcohalide into formamidinium lead tri-iodide (FAPbI₃).

Enhanced coordination interaction with multi-site binding ligands for efficient and stable perovskite solar cells.

Conventional passivating ligands bind to perovskite surfaces through only a single active site, which not only creates a resistive barrier due to dense ligand packing but also restricts the enhancement of device stability. Here, we identify an antimony chloride-N,N-dimethyl selenourea complex, Sb(SU)Cl, as a multi-anchoring ligand to significantly enhance perovskite crystallinity, suppress defect formation, and dramatically improve moisture resistance and overall stability. As a result, we achieve a power conversion efficiency of 25.

Toughened Interface by Engineering the Side Group of Conjugated Polymers to Stabilize Flexible Perovskite Solar Modules.

Perovskite solar cells (PSCs) have attracted considerable attention due to their high power conversion efficiency (PCE), cost-effective manufacturing processes, as well as the potential flexibility. However, a significant challenge to the commercial applications of PSCs is their mechanical reliability. In this work, three naphthalene diimide polymers with distinct donor units are chosen to reduce surface trap states and enhance the long-term stability and mechanical reliability of photovoltaic devices.

Health disparity among older adults in Urban China: Does labor migration Matter?

China has seen a surge in labor migration and widening regional health disparities among urban older residents since the late 1990. However, the relationship between labor migration and these disparities remains unknown. This study employs the shift-share instrument method to explore the association between labor migration and the self-rated health among urban older residents with the microdata from the 1% National Population Sample Survey (2005 and 2015) and provincial panel data (2010-2020).

Starch Cross-Linked Glass Fibers for Water Evaporation-Induced Electricity Generation.

Water evaporation-induced electricity devices (WEDs) have become extremely attractive, converting ambient heat into electricity while being environmentally friendly. However, most current WEDs are costly and cumbersome to fabricate, which greatly limits their commercialization process. Here, we present WEDs based on starch cross-linked with glass fiber filter paper (Starch-GF).

Engineering Spacer Conjugation for Efficient and Stable 2D/3D Perovskite Solar Cells and Modules.

Incorporating two-dimensional (2D) perovskite in 3D perovskite absorber holds great potential to improve the stability and efficiency of perovskite solar cells (PSCs). However, the bulky-cation-based 2D structures often exhibit poor charge transport and are prone to formation of charge-extraction barrier that impedes efficient device operation. We address these issues by introducing aromatic spacers with molecular conjugation into 2D perovskites locating between 3D perovskites and electron charge transport layers.

Heavy pnictogen chalcohalides for efficient, stable, and environmentally friendly solar cell applications.

Solar cell technology is an effective solution for addressing climate change and the energy crisis. Therefore, many researchers have investigated various solar cell absorbers that convert Sunlight into electric energy. Among the different materials researched, heavy pnictogen chalcohalides comprising heavy pnictogen cations, such as Biand Sb, and chalcogen-halogen anions have recently been revisited as emerging solar absorbers because of their potential for efficient, stable, and low-toxicity solar cell applications.

Light-Emitting Conjugated Organic Polymer as an Efficient Fluorescent Probe for Cu Ions Detection and Cell Imaging.

Conjugated organic polymers (COPs) have been excellent candidates because the conjugated structure occupied π structure that is useful to develop light-emitting materials. However, most COPs emitt weak luminescence owing to the H-aggregation effect. Light-emitting conjugated organic polymers (LCOP-1) possess rich butyl groups anchored in the skeleton to enhance light-emitting activity via reducing the H-aggregation effect.

Constructing Stable and Porous Covalent Organic Frameworks for Efficient Iodine Vapor Capture.

Covalent organic frameworks (COF) with periodic porous structures and tunable functionalities are a new class of crystalline polymers connected via strong covalent bonds. Constructing COF materials with high stability and porosity is attracting and essential for COFs' further functional exploration. In this work, two new covalent organic frameworks (TTA-TMTA-COF and TTA-FMTA-COF) with high surface area, large pore volume, and excellent chemical stability toward harsh conditions are designed and synthesized by integrating the methoxy functional groups into the networks.

Efficient and Stable Antimony Selenoiodide Solar Cells.

Although antimony selenoiodide (SbSeI) exhibits a suitable bandgap as well as interesting physicochemical properties, it has not been applied to solar cells. Here the fabrication of SbSeI solar cells is reported for the first time using multiple spin-coating cycles of SbI solutions on SbSe thin layer, which is formed by thermal decomposition after depositing a single-source precursor solution. The performance exhibits a short-circuit current density of 14.

Strain Tuning via Larger Cation and Anion Codoping for Efficient and Stable Antimony-Based Solar Cells.

Strain induced by lattice distortion is one of the key factors that affect the photovoltaic performance via increasing defect densities. The unsatisfied power conversion efficiencies (PCEs) of solar cells based on antimony chalcogenides (Sb-Chs) are owing to their photoexcited carriers being self-trapped by the distortion of SbS lattice. However, strain behavior in Sb-Chs-based solar cells has not been investigated.

Efficient Solar Cells Employing Light-Harvesting Sb Bi SI.

Sb Bi SI, an isostructural material with the well-known quasi-1D SbSI, possesses good semiconductive and ferroelectric properties but is not applied in solar cells. Herein, solar cells based on alloyed Sb Bi SI (ASBSI) as a light harvester are fabricated. ASBSI is prepared through the reaction of bismuth triiodide in N,N-dimethylformamide solution with an antimony trisulfide film deposited on a mesoporous (mp)-TiO electrode via chemical bath deposition at 250 °C under an argon or nitrogen atmosphere; the alloy exhibits a promising bandgap (1.

Stabilization of Lead-Tin-Alloyed Inorganic-Organic Halide Perovskite Quantum Dots.

Recently, lead-tin-based alloyed halide perovskite quantum dots (QDs) with improved stability and less toxicity have been introduced. However, the perovskite QDs containing tin are still unstable and exhibit low photoluminescence quantum yields (PLQYs), owing to the presence of defects in the alloyed system. Here, we have attempted to introduce sulfur anions (S) into the host lattice (MAPbSnBr) as a promising route to stable alloyed perovskite QDs with improved stability and PLQY.

Nanochannel-Assisted Perovskite Nanowires: From Growth Mechanisms to Photodetector Applications.

Growing interest in hybrid organic-inorganic lead halide perovskites has led to the development of various perovskite nanowires (NWs), which have potential use in a wide range of applications, including lasers, photodetectors, and light-emitting diodes (LEDs). However, existing nanofabrication approaches lack the ability to control the number, location, orientation, and properties of perovskite NWs. Their growth mechanism also remains elusive.

Mixed Sulfur and Iodide-Based Lead-Free Perovskite Solar Cells.

The use of divalent chalcogenides and monovalent halides as anions in a perovskite structure allows the introduction of 3 and 4 charged cations in the place of the 2 metal cations. Herein we report for the first time on the fabrication of solar cells exploiting methylammonium antimony sulfur diiodide (MASbSI) perovskite structures, as light harvesters. The MASbSI was prepared by annealing under mild temperature conditions, via a sequential reaction between antimony trisulfide (SbS), which is deposited by the chemical bath deposition (CBD) method, antimony triiodide (SbI), and methylammonium iodide (MAI) onto a mesoporous TiO electrode, and then annealed at 150 °C in an argon atmosphere.

Highly Sensitive and Broadband Organic Photodetectors with Fast Speed Gain and Large Linear Dynamic Range at Low Forward Bias.

Photodetectors with high photoelectronic gain generally require a high negative working voltage and a very low environment temperature. They also exhibit low response speed and narrow linear dynamic range (LDR). Here, an organic photodiode is demonstrated, which shows a large amount of photon to electron multiplication at room temperature with highest external quantum efficiency (EQE) from ultraviolet (UV) to near-infrared region of 5.

Aligned nanofibers as an interfacial layer for achieving high-detectivity and fast-response organic photodetectors.

We report that aligned nanofibers (ANs) prepared by electrostatic spinning technology as an interfacial layer can significantly enhance the performance of inverted organic photodetectors. With the insertion of ANs of titanium dioxide (TiO2), the optimized organic photodetectors had a highest detectivity of 2.93 × 10(13) Jones at zero bias, which is about 3 times higher than that of a similar organic photodetector without ANs and also markedly higher than that of traditional silicon photodetectors.