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The family of metal‐free molecular perovskites, an emerging novel class of eco‐friendly semiconductor, welcomes a new member with a unique 1D hexagonal perovskite structure. Lowering dimensionality at molecular level is a facile strategy for crystal structure conversion, optoelectronic property regulation, and device performance optimization. Herein, the study reports the design, synthesis, packing...
Grain boundaries (GBs)‐triggered severe non‐radiative recombination is recently recognized as the main culprits for carrier loss in polycrystalline kesterite photovoltaic devices. Accordingly, further optimization of kesterite‐based thin film solar cells critically depends on passivating the grain interfaces of polycrystalline Cu2ZnSn(S,Se)4 (CZTSSe) thin films. Herein, 2D material of graphene is...
With better light utilization, larger tolerance factor, and higher power conversion efficiency (PCE), the HC(NH2)2+(FA)‐based perovskite is proven superior to the popular CH3NH3+ (MA)‐ and Cs‐based halide perovskites in solar cell applications. Unfortunately, limited by intrinsic defects within the FA‐based perovskite films, the perovskite films can be easily transformed into a yellow δ‐phase at room...
Metal‐free halide perovskites (MFHaPs) have garnered significant attention in recent years due to their desirable properties, such as low toxicity, light weight, chemical versatility, and potential for optoelectronics. MFHaPs with the formula A2+B+X−3 (where A is a large organic divalent cation, B+ is typically NH4+, and X is a halide) have been studied extensively, but few studies have examined alternative...
About 10% efficient antimony selenosulfide (Sb2(S,Se)3) solar cell is realized by using selenourea as a hydrothermal raw material to prepare absorber layers. However, tailoring the bandgap of hydrothermal‐based Sb2(S,Se)3 film to the ideal bandgap (1.3–1.4 eV) using the selenourea for optimal efficiency is still a challenge. Moreover, the expensive selenourea dramatically increases the fabricating...
The nonradiative charge recombination caused by surface defects and inferior crystalline quality are major roadblocks to further enhancing the performance of CsPbI3−xBrx perovskite solar cells (PSCs). Theoretical calculations indicate that sodium diethyldithiocarbamate (NaDDTC), a popular bacteriostatic benign material, can initiate multiple interactions with the CsPbI3−xBrx perovskite surface to...
Interface modification to minimize charge recombination and trapping for efficient charge transport is crucial for the performance of perovskite solar cells (PSCs). Herein, functionalized p‐type blue carbon dots (B‐CDs) are ventured as an interface passivation layer to enhance the efficiency and long‐term stability of all‐inorganic CsPbI2Br PSCs. It is found that first the blue carbon dots with abundant...
The NiO‐based electrocatalytic oxygen evolution reaction (OER) of water splitting is recognized as a promising approach to produce clean H2 fuel. However, the OER performance is still low, and especially, the overpotential is larger than 200 mV at the current density of 10 mA cm−2. Herein, an Ir@IrNiO sample is prepared with single‐atom (SA) Ir4+ doping and surface metallic Ir nanoparticles loaded...
In article number 2007011, Wei Ma and co‐workers achieve simultaneous enhancement of efficiency, deformability and mechanical stability of organic solar cells by modulating the intermolecular interaction through incorporating a ductile third component. This strengthened intermolecular interaction enables the optimized ternary system with better morphology stability against force and heat.
Promoting efficiency, deformability, and life expectancy of stretchable organic solar cells (OSCs) have always been key concerns that researchers are committed to solving. However, how to improve them simultaneously remains challenging, as morphology parameters, such as ordered molecular arrangement, beneficial for highly efficient devices actually limits mechanical stability and deformability. In...
The morphological quality of the photoactive layer is the key component affecting the performance metrics of a photovoltaic device. Therefore, fine adjustment of the crystallization dynamics is urgently required. By manipulating the amount of dimethyl sulfoxide (DMSO) remaining in the spin‐coated perovskite films during the annealing treatment, an obvious morphological evolution arises. The crystallization...
2D Dion–Jacobson (DJ) perovskites have recently drawn much attention owing to their superior charge transport and high environmental stability. Unfortunately, their intrinsic optoelectronic properties are largely unexplored due to the lack of high‐quality single crystals available for accurate measurements. Herein, a reactive, low‐temperature‐gradient crystallization process to grow high‐quality 2D...
Excellent power conversion efficiency (PCE) and stability are the primary forces that propel the all‐inorganic cesium‐based halide perovskite solar cells (PSCs) toward commercialization. However, the intrinsic high density of trap state and internal nonradiative recombination of CsPbIBr2 perovskite film are the barriers that limit its development. In the present study, a facile additive strategy is...
All‐inorganic perovskite solar cells have developed rapidly in the last two years due to their excellent thermal and light stability. However, low efficiency and moisture instability limit their future commercial application. The mixed‐halide inorganic CsPbI2Br perovskite with a suitable bandgap offers a good balance between phase stability and light harvesting. However, high defect density and low...
The solvent‐engineering method is widely used to fabricate top‐performing perovskite solar cells, which, however, usually exhibit inferior reproducibility. Herein, a two‐stage annealing (TSA) strategy is demonstrated for processing of perovskite films, namely, annealing the intermediate phase at 60 °C for the first stage then at 100 °C for the second stage. Compared to conventional direct annealing...
In artificial photocatalytic hydrogen evolution, effective incident photon absorption and a high‐charge recombination rate are crucial factors influencing the overall efficiency. Herein, a traditional solid‐state synthesis is used to obtain, for the first time, novel samples of few‐layered g‐C3N4 with vertically aligned MoS2 loading (MoS2/C3N4). Thiourea and layered MoO3 are chosen as precursors,...
Organic–inorganic hybrid perovskite as a kind of promising photovoltaic material is booming due to its low‐cost, high defect tolerance, and easy fabrication, which result in the huge potential in industrial production. In the pursuit of high efficiency photovoltaic devices, high‐quality absorbing layer is essential. Therefore, developing organic–inorganic hybrid perovskite thin films with good coverage,...
A P doped MoO3−x nanocomposite material with rich oxygen vacancies is successfully fabricated by a two‐step intercalation method, which presents superior activity for the hydrogen evolution reaction with low overpotential and fast electron transfer. In 0.5 m H2SO4, it displays an overpotential of 166 mV for driving the current density of 10 mA cm−2. Moreover, it also shows a good catalytic stability...
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