Though formamidinium lead triiodide (FAPbI3) possesses a suitable band gap and good thermal stability, the phase transition from pure black perovskite (α-phase) to undesirable yellow nonperovskite polymorph (δ-phase) at room temperature, especially under humid air, hinders its practical application. Here, we investigate intrinsic instability mechanism of α-phase ambient temperature demonstrate existence an anisotropic strained lattice in (111) plane that drives transformation into δ-phase....

Abstract Podlike nitrogen‐doped carbon nanotubes encapsulating FeNi alloy nanoparticles (Pod(N)‐FeNi) were prepared by the direct pyrolysis of organometallic precursors. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements revealed their excellent electrocatalytic activities in I − /I 3 redox reaction dye‐sensitized solar cells (DSSCs). This is suggested to arise from modification surface electronic properties encapsulated metal (NPs)....

Abstract Although three-dimensional metal halide perovskite (ABX 3 ) single crystals are promising next-generation materials for radiation detection, state-of-the-art X-ray detectors include methylammonium as A-site cations, limiting the operational stability. Previous efforts to improve stability using formamidinium–caesium-alloyed cations usually sacrifice detection performance because of high trap densities. Here we successfully solve this trade-off between and by synergistic composition...

Abstract The unstable feature of the widely employed organic hole‐transporting materials (HTMs) (e.g., spiro‐MeOTAD) significantly limits practical application perovskite solar cells (PSCs). Therefore, it is desirable to design new structured PSCs with stable HTMs presenting excellent carrier extraction and transfer properties. This work demonstrates a inverted PSC configuration. has graded band alignment bilayered inorganic (i.e., compact NiO x mesoporous CuGaO 2 ). In comparison...

Abstract In the last few years, organometal halide perovskites (OHPs) have emerged as a promising candidate for photovoltaic (PV) applications. A certified efficiency high 23.7% has been achieved, which is comparable with most of well‐established PV technologies. Their good solubility due to ionic nature enables versatile low‐temperature solution processes, including blade coating, slot‐die etc., are scalable and compatible roll‐to‐roll large‐scale manufacturing processes. The low cost,...

X-ray detectors are widely utilized in medical diagnostics and nondestructive product inspection. Halide perovskites recently demonstrated as excellent candidates for direct detection. However, it is still challenging to obtain high quality with millimeter-thick over a large area performance, stable detectors. Here, methylammonium bismuth iodide (MA3 Bi2 I9 ) polycrystalline pellets (PPs) developed by robust, cost effective, scalable cold isostatic-pressing fabricating low limit of detection...

Sensitive and reliable X-ray detectors are essential for medical radiography, industrial inspection security screening. Lowering the radiation dose allows reduced health risks increased frequency fidelity of diagnostic technologies earlier detection disease its recurrence. Three-dimensional (3D) organic–inorganic hybrid lead halide perovskites promising direct – they show improved sensitivity compared to conventional detectors. However, their high unstable dark current, caused by ion...

Organolead trihalide perovskite single crystals (SCs) offer unprecedented opportunity for X-ray and visible light detection. Nevertheless, it remains a challenge to keep simultaneous high-performance stability at high-temperature working mode. Herein, formamidinium lead bromide (FAPbBr3) SCs are developed successfully address these issues. Low-temperature crystallized induced FAPbBr3 possess an excellent mobility-lifetime product ultralow surface charge recombination velocity, thus...

Porous chalcogels CoMoS4 and NiMoS4 made by a facile solution reaction displayed good electrocatalytic activity in the redox of I−/I3− shuttle. Dye-sensitized solar cells with these ternary compounds as counter electrodes (CEs) showed photovoltaic performance similar to devices noble metal platinum CE (7.46%).

Ferroelectric solar cells were fabricated by using the inorganic–organic hybrid perovskite materials, and power conversion efficieny as high 6.7% had been obtained based on MAPbI_3−xCl_xthin film. This work provides an alternative avenue for high-performance ferroelectric beyond inorganic oxides.

Anti‐solvent assisted crystallization (ASAC) is currently one of the most widely used methods to obtain perovskite films with great quality due its advantage low cost and easy operation. The commonly anti‐solvents, toluene, chlorobenzene (CB), are well recognized be contaminants in drinking water exhibit high toxicity levels. It desirable develop environmentally benign solvents for fabrication solar cells by ASAC method. As a green solvent, methoxybenzene (PhOMe) has advantages toxicity,...

Incorporation of T1 and T2 contrast material in one nanosystem performing their respective MR role simultaneously serving as an efficient drug delivery system (DDS) has a significant potential application for clinical diagnosis chemotherapy cancer. However, inappropriate incorporation always encountered many issues, such low contact area with water-proton, distance between water molecule, undesirable disturbance imaging. Those issues seriously limited the or effect. In this work, we...

We investigated moisture and thermal stability of MAPbBr3 perovskite material. Cubic was found to be moisture-insensitive can avoid the issues introduced by low-temperature phase transition in MAPbI3. MAPbI3 hybrid solar cells with efficiencies ∼7.1% ∼15.5%, respectively, were fabricated, we identified correlation between working temperature, light intensity, photovoltaic performance. No charge-carrier transport barriers cells. The cell displays a better under high temperature because its...

Direct X-ray detectors based on metal halide perovskites and their derivatives exhibit high sensitivity low limit of detection (LoD). Compared with three-dimensional (3D) hybrid lead perovskites, low-dimensional A3Bi2I9 perovskite (A = Cs, Rb, NH4, CH3NH3(MA)) present better stability, greater environmental friendliness, comparable performance. Here, we report FA3Bi2I9 (FA= CH(NH2)2) single crystals (SCs) as a new member the series for detection, which were prepared by nucleation-controlled...

Commercialization of perovskite solar cells (PSCs) requires developing high-efficiency devices with good stability. Ionic defects existing in the layer can serve as nonradiative recombination centers to deteriorate performance PSCs and introduce chemical degradation material introducing instability issues. Here, passivation molecules various electron density distributions (EDD) are employed an ideal model reveal role EDD on defect thin films. Power conversion efficiency (PCE) exceeding 21%...

Halide perovskite materials possess excellent optoelectronic properties and have shown great potential for direct X-ray detection. Perovskite wafers are particularly attractive among various detection structures due to their scalability ease of preparation, making them the most promising candidates array imaging applications. However, device instability current drift caused by ionic migration persistent challenges detectors, especially in polycrystalline with numerous grain boundaries. In...

The modification of perovskite precursor by a series phosphoryl chloride molecules can indeed improve the performance LEDs (Pero-LEDs). bis(2-oxo-3-oxazolidinyl) phosphinic not only regulate phase distribution controlling crystallization rate but also passivate defects quasi-2D perovskite. Highly efficient and reproducible Pero-LEDs are achieved with an maximum external quantum efficiency (EQEmax) 20.82% average EQE (EQEave) around 20% on 50 devices. Quasi-2D perovskites have attracted...

Abstract Metal halide perovskites have emerged as highly promising candidates for next‐generation X‐ray detectors due to their facile and low‐cost processability, high attenuation coefficient, tunable optoelectrical properties. In this work, quasi‐2D Dion‐Jacobson (DJ) are introduced in a flat panel imager (FPXI) imaging. This study demonstrates that the diammonium interlayers DJ play key role enhancing structural stability, suppressing ion migration, improving charge transport. As result,...

Abstract Polycrystalline CsPbBr 3 perovskite materials exhibit exemplary stability, and desirable optoelectronic characteristics are promising for direct X‐ray detection. In this study, polycrystalline 2D phase of CsPb 2 Br 5 hinged on is investigated array detector. The incorporation will modify the carrier transport environment, acting as an amplification factor that significantly enhances mobility response sensitivity. Finally, devices demonstrates excellent performance growth. Carrier...

Abstract It is essential to minimize the interfacial trap states and improve carrier collection for high efficiency perovskite solar cells (PSCs). Herein, we present a facile method construct p‐type graded heterojunction (GHJ) in normal PSCs by deploying gradient distribution of hole‐transporting materials (poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine], PTAA, this case) shallow layer. The formation GHJ structure facilitates charge transfer collection, passivates states, thus delivering...