Abstract The best research‐cell efficiency of perovskite solar cells (PSCs) is comparable with that of mature silicon solar cells (SSCs); However, the industrial development of PSCs lags far behind SSCs. PSC is a multiphase and multicomponent system, whose consequent interfacial energy loss and carrier loss seriously affect the performance and stability of devices. Here, by using spinodal decomposition, a spontaneous solid phase segregation process, in situ introduces a poly(3‐hexylthiophene)/perovskite (P3HT/PVK) heterointerface with interpenetrating structure in PSCs. The P3HT/PVK heterointerface tunes the energy alignment, thereby reducing the energy loss at the interface; The P3HT/PVK interpenetrating structure bridges a transport channel, thus decreasing the carrier loss at the interface. The simultaneous mitigation of energy and carrier losses by P3HT/PVK heterointerface enables n‐i‐p geometry device a power conversion efficiency of 24.53% (certified 23.94%) and excellent stability. These findings demonstrate an ingenious strategy to optimize the performance of PSCs by heterointerface via Spinodal decomposition.
The treeline is a sensitive region of the terrestrial ecosystem responding to climate change. However, studies on the composition and formation mechanisms of soil fungal communities across the treeline are still lacking. In this study, we investigated the patterns of soil fungal community composition and interactions among functional guilds above and below the treeline using Illumina high-throughput sequencing and ecological network analysis. The results showed that there were significant differences in the soil environment and soil fungal community composition between the two ecosystems above and below the treeline. At the local scale of this study, geographic distance and environmental factors affected the composition of the soil fungal community. Soil temperature was an important environmental predictor of soil fungal community composition. Species in soil fungal communities in the subalpine meadow were more closely related to each other compared to those in the montane forest. Furthermore, the soil fungal community in montane forest was more stable. Our findings contribute to a better understanding of how mountain ecological functions respond to global climate change.
The selective upgrading of polyethylene waste into light aromatics is hampered by relatively high C–C bond cleavage temperatures and low product selectivity. Herein, we report a low-temperature melting-catalysis strategy that directly upgrades low-density polyethylene (LDPE) into light aromatics over commercial ZSM-5 zeolite under mild conditions, eliminating the need for precious metals, solvent, or external H2. Experimental results combined with DFT calculations and molecular dynamics simulations revealed that the molten LDPE microenvironment facilitates intimate LDPE-catalyst contact, promoting primary C–C cleavage while suppressing olefin intermediates diffusion out of pores. This feature increases the residence time for subsequent direct olefin cyclization within the confined micropores. Moreover, online mass spectra confirmed that the in situ generated hydrogen from cyclization and dehydroaromatization reactions plays a vital role in C–C bond scission. By optimizing the reaction conditions, a light aromatic yield of 50.6 wt % with an impressive selectivity of 90.9% toward benzene, toluene, and xylenes was achieved at 280 °C for 1 h. This strategy is not limited to the model polyethylene but also demonstrates remarkable efficiency in the depolymerization of various widely used polyethylene-rich plastics, enabling an economically viable and environmentally benign chemical recycling path for plastic wastes.
Tin is one of the most promising alternatives to lead to make lead-free halide perovskites for optoelectronics. However, the stability of tin-based perovskites is hindered by the oxidation of Sn(II) to Sn(IV). Recent works established that dimethyl sulfoxide, which is one of the best-performing solvents for processing perovskite, is the primary source of tin oxidation. The quest for a stable solvent could be a game-changer in the stability of tin-based perovskites. Starting from a database of over 2000 solvents, we identified a series of 12 new solvents suitable for the processing of formamidinium tin iodide perovskite (FASnI3) by investigating (1) the solubility of the precursor chemicals FAI and SnI2, (2) the thermal stability of the precursor solution, and (3) the possibility of forming perovskite. Finally, we demonstrate a new solvent system to produce solar cells outperforming those based on DMSO. Our work provides guidelines for further identification of new solvents or solvent mixtures for preparing stable tin-based perovskites.
Metal halide perovskites, an emerging photovoltaic material, have attracted significant attention in the industry and academia due to their excellent optoelectronic properties. However, perovskite solar cells’ (PSCs) stability has become the biggest obstacle to commercialization despite the progress in their commercial development. Interface engineering, doping, and novel charge‐transport materials are effective approaches to enhance the stability of PSCs. Since discovering graphene as a single‐layer material, researchers have favored two‐dimensional (2D) materials for their outstanding physical and chemical properties. In the continuous development of PSCs, 2D materials offer tunable functional groups, tunable energy levels, high charge transfer capabilities, and extraordinary physical characteristics such as thermal conductivity and hydrophobicity. They serve as effective materials to improve the stability of PSCs. Different types of 2D materials may exhibit unprecedented effects through different functional designs. In this review, the specific mechanisms through which 2D materials enhance the stability of perovskite solar cells (PSCs) are focused on and recent advancements in improving PSC stability across various dimensions are summarized, including photo, thermal, and environmental stability, and the potential applications of different types of 2D materials are discussed. Finally, insights are offered into addressing stability‐related challenges in PSCs. This comprehensive approach aims to guide future research efforts in optimizing both the stability and performance of PSCs through the integration of 2D materials.
Abstract The rapid development of Internet of Things mobile terminals has accelerated the market's demand for portable mobile power supplies and flexible wearable devices. Here, an embedded metal‐mesh transparent conductive electrode (TCE) is prepared on poly(ethylene terephthalate) (PET) using a novel selective electrodeposition process combined with inverted film‐processing methods. This embedded nickel (Ni)‐mesh flexible TCE shows excellent photoelectric performance (sheet resistance of ≈0.2–0.5 Ω sq −1 at high transmittance of ≈85–87%) and mechanical durability. The PET/Ni‐mesh/polymer poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS PH1000) hybrid electrode is used as a transparent electrode for perovskite solar cells (PSCs), which exhibit excellent electric properties and remarkable environmental and mechanical stability. A power conversion efficiency of 17.3% is obtained, which is the highest efficiency for a PSC based on flexible transparent metal electrodes to date. For perovskite crystals that require harsh growth conditions, their mechanical stability and environmental stability on flexible transparent embedded metal substrates are studied and improved. The resulting flexible device retains 76% of the original efficiency after 2000 bending cycles. The results of this work provide a step improvement in flexible PSCs.
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