Multifunctional Effects of Biguanide Derivative in the Application of Highly Efficient Tin-Lead Perovskite Solar Cells.

Tin-lead (Sn-Pb) mixed perovskites is beneficial to a single-junction or all-perovskite tandem device. However, the poor quality of the perovskite surface resulting from Sn oxidation and uncontrollable crystallization degrades device performance and stability. Herein, based on interface engineering, a novel biguanide derivative of PZBGACl is employed that integrates different types of N-related groups to reconstruct the surface/grain boundaries of Sn-Pb perovskite.

A Newly Crosslinked-double Network PEDOT:PSS@PEGDMA toward Highly-Efficient and Stable Tin-Lead Perovskite Solar Cells.

Until now, poly(3,4-ethylenedioxythiophene):poly(styrensulfonate) (PEDOT:PSS) is widely used in Sn-Pb perovskite solar cells (PSCs) due to its many advantages, including high optical transparency, suitable conductivity, superior wettability, and so on. However, the acidic and hydroscopic properties of the PSS component, as well as the incongruous energy level of the hole transport layer (HTL), may lead to unsatisfying interface properties and decreased device performance. Herein, by adding polyethylene glycol dimethacrylate (PEGDMA) into PEDOT:PSS, a newly crosslinked-double-network obtain of PEDOT:PSS@PEGDMA film, which could not only optimize nucleation and crystallinity of Sn-Pb perovskite films, but also suppress defect density and optimize energy level alignment at the HTL/perovskite interface.

Multifunctional Ionic Liquid as an Interfacial Modifier for High-Performance and Stable NiO-Based Inverted Perovskite Solar Cells.

Interface instability has evolved into the primary aspect that limits the durability improvement of perovskite solar cells (PSCs). Interface modification with suitable molecules is widely considered an effective path for improving the interface state. Herein, an ionic liquid modified layer, 1-ethyl-3-methylimidazolium aminoacetate (EMIMAE), is brought to modify NiO/perovskite interface.

In Situ Perovskitoid Engineering at SnO Interface toward Highly Efficient and Stable Formamidinium Lead Triiodide Perovskite Solar Cells.

The black-phase formamidinium lead triiodide (α-FAPbI) perovskite has turned out to be one of the most efficient light harvesting materials. However, the phase stability of FAPbI is a long-standing issue. Herein, we introduce a layer of tetrabutylammonium fluoride (TBAF) on SnO, which would form an in situ layer of TBAPbI perovskitoid at the SnO/FAPbI interface by interacting with PbI.

Enhanced Ultraviolet Damage Resistance in Magnesium Doped Lithium Niobate Crystals through Zirconium Co-Doping.

MgO-doped LiNbO (LN:Mg) is famous for its high resistance to optical damage, but this phenomenon only occurs in visible and infrared regions, and its photorefraction is not decreased but enhanced in ultraviolet region. Here we investigated a series of ZrO co-doped LN:Mg (LN:Mg,Zr) regarding their ultraviolet photorefractive properties. The optical damage resistance experiment indicated that the resistance against ultraviolet damage of LN:Mg was significantly enhanced with increased ZrO doping concentration.

Stable Layered 2D Perovskite Solar Cells with an Efficiency of over 19% via Multifunctional Interfacial Engineering.

Layered 2D perovskites have been extensively investigated by scientists with photovoltaics (PV) expertise due to their good environmental stability. However, a random phase distribution in the perovskite film could affect both the performance and stability of the devices. To overcome this problem, we propose multifunctional interface engineering of 2D GAMAPbI perovskite by employing guanidinium bromide (GABr) on top of it to optimize the secondary crystallization process.

Linear Tuning of Phase-Matching Temperature in LiNbO:Zr Crystals by MgO Co-Doping.

We grew a series of co-doped LiNbO crystals with fixed 1.5 mol % ZrO and various MgO concentrations (1.0, 3.

Near-Infrared Light-Driven Controllable Motions of Gold-Hollow-Microcone Array.

Micro/nanomotors can effectively convert other forms of energy into mechanical energy, which have been widely used in microscopic fields. However, it is still challenging to integrate the micro/nanomotors to perform complex tasks for broad applications. Herein, a new mode for driving the collective motion behaviors of integrated micro/nanomotors in a liquid by plasmonic heating is reported.

Room temperature 90° phase-matching in zirconium and magnesium co-doped lithium niobate crystals.

Laser has been widely used in many aspects, by now it is difficult to get each frequency that we want, and frequency conversion is an effective way to obtain different frequency laser through a nonlinear optical crystal. MgO-doped LiNbO (Mg:LN) crystal has usually been used for second harmonic generation (SHG) through temperature-matching configuration with a stove, till now a room temperature 90° phase-matching is still lacking. Here we find that the SHG of Nd:YAG laser is achieved at 26.

Polystyrene sulfonate threaded in MIL-101Cr(iii) as stable and efficient acid catalysts.

A series of polystyrene sulfonate threaded in MIL-101Cr(iii) composites both with and without cross-linkers were synthesized. These composites demonstrated superior activity and durability for the acid catalyzed reaction, thus highlighting the importance of surface properties, mobility and accessibility of active sites in determining the catalytic performance.