Hai Zhou

Compared with single perovskite nanowires or arrays, perovskite nanowire networks (PNWNs) have greater application potential in large‐area and array integration due to their unique morphology and simpler fabrication. However, surface defects and poor bending capacity from cross‑stacking severely limit performance, stability, and flexibility. Here, 3, 4‐difluorophenylamine chloride (34F2PMACl) is employed to passivate the surface defects and form quasi‐2D perovskite (n = 2) adhesive layers on the surface and micro‐interface of the NWs, improving carrier transport and stress release during bending. The resulting flexible self‐powered PNWN photodetectors (PDs) exhibit a low weak‐light detection limit (110 pW cm ⁻² ), large linear dynamic range (216 dB), high responsivity (4.79 A W ⁻¹ ), and high detectivity (6.23 × 10 ¹³ Jones), respectively, representing one of the highest performances of carbon‐based flexible perovskite PDs reported to date. Moreover, the flexible device demonstrates performance attenuation of less than 5% after 35 000 and 25 000 bending cycles at the bending radius of 8.5 and 4 mm, respectively, surpassing all flexible perovskite PDs reported so far. Furthermore, the large‐area (1 cm ² ) flexible device enables wearable heart‑rate monitoring via photoplethysmography under 28.4 µW cm ^{− 2} weak light. Finally, the flexible device array (6 × 6) achieves real‑time self‑powered weak‑light imaging at 370 nW cm ^{− 2} , demonstrating great potential for image sensing.

The non-radiative recombination induced by localized charges and inhomogeneous surface potential of perovskite film limits the advancement of stable and efficient perovskite solar cells (PSCs). Herein, for the first time, (Ferrocenylmethyl)trimethylammonium chloride (FTAC) is introduced to reconstruct the surface of the perovskite film. Calculations reveal Pb-N coordination between FTAC and the perovskite framework, accompanied by iodine-vacancy compensation, thereby leading to effective defect passivation and mitigating charge localization. Meanwhile, this reconstruction strategy ensures potential uniformity across the perovskite interface and a more p-type characteristic, thereby accelerating the charge transport in PSCs. As a result, FTAC-modified devices deliver an outstanding efficiency of 25.06% with a low voltage deficit of 0.32 V, a significant improvement over the 23.31% efficiency of control PSCs. In addition, the target devices display excellent stability, retaining 91.16% of their initial efficiency after 1,000 h aging at 85 °C in N2 and 88.67% after 1,000 h of continuous maximum power point tracking at 65 °C. In the present study, by reconstructing the perovskite film surface to achieve a homogeneous potential distribution, non-radiative recombination is effectively reduced, offering an innovative approach to boost PSC efficiency and device stability.

All-inorganic halide perovskite CsPbCl3 has shown great application potential in the field of near-ultraviolet photodetection due to its suitable direct bandgap, high absorption coefficient, and excellent photoelectric conversion characteristics. However, the poor crystallization quality, high defect density, and insufficient ultraviolet light stability of CsPbCl3 thin films have severely restricted the improvement of device performance. In this study, high-quality CsPbCl3 submicron-crystal thin films with an average grain size of approximately 1 µm were prepared by a two-step sequential deposition method. The effects of process parameters, including precursor concentration, annealing temperature, and reaction time, on the microstructure and photoelectric properties of the thin films were systematically investigated. The hole-transport-layer-free (HTL-free) photodetector based on the CsPbCl3 perovskite thin film exhibited excellent performance parameters, including a responsivity of 0.113 A·W-1, a detectivity of 1.0×10¹² Jones, a linear dynamic range of 161.6, an on-off ratio of 1.8×105, a bandwidth exceeding 50 kHz, ultrafast response times of τrise=3.6 µs and τfall=3.2 µs, as well as good stability. This study achieves a synergistic enhancement of the crystallization quality and photoelectric performance of CsPbCl3 thin films through two-step process optimization, providing important experimental evidence and a feasible technical pathway for the development of high-performance, highly stable all-inorganic perovskite near-ultraviolet photodetectors.

Halide perovskites have attracted tremendous attention in optoelectronic devices due to their excellent photophysical properties. However, they are prone to photodegradation under ultraviolet (UV) light, limiting their applications in UV photodetectors (PDs). Here, energy band engineering is adopted to achieve efficient and stable perovskite UVPDs, in which the band gap of the CsPbCl3 microcrystals (MCs) is regulated by Rb doping. The fabricated Cs_0.84Rb_0.16PbCl₃ MC film exhibits wider bandgap and improved optical properties. Finally, under 365 nm light, the Cs_0.84Rb_0.16PbCl₃ perovskite PDs show superior UV detection performance including an open-circuit voltage of 0.84 V, an on-off ratio of 2.81×10⁶, a responsivity of 0.6 A/W and a detectivity of 3.48×10¹² Jones. Moreover, the PDs exhibit outstanding stability to UV light and temperature. This work provides a new strategy for the fabrication of high-performance perovskite UVPDs.

1,2-Diformylhydrazine was used for the first time to regulate residual strain and passivate defects within perovskite films, and the corresponding devices exhibit high performance and good stability.

This work uses BMIMHSO ₄ to bridge and optimize the buried SnO ₂ /MAPbI ₃ nanowire interface, enabling flexible carbon-based self-powered perovskite photodetectors with high responsivity, wide LDR, and strong humidity/bending stability.

AIDCN was utilized for the first time as a dipole molecular bridge at the perovskite/hole transport layer (HTL) interface to simultaneously achieve energy level alignment and defect passivation.

Bio-inspired artificial visual neural systems have attracted significant interest, yet they often face challenges related to complex fabrication and high energy consumption. This work presents a low-power photonic synaptic device based on the lead-free all-inorganic perovskite Ag ₂ BiI ₅ , which is prepared by a simple spin-coating method with an interdigital electrode structure. The resulting device operates at an ultra-low voltage of 0.1 V with an energy consumption of just 1.43 pJ/pulse. It successfully emulates fundamental synaptic functions, including short-term plasticity (STP), long-term plasticity (LTP), paired-pulse facilitation (PPF), and paired-pulse depression (PPD). By modulating light pulses, transitions from short-term to long-term memory are achieved, and behaviors such as Pavlovian conditioning and image memory enhancement are demonstrated. Furthermore, in a 5×5 synaptic array, the device mimics human visual memory processes, where memory strength is tuned by the number of training pulses. For application validation, a convolutional neural network based on this device achieves 90.6% accuracy on the Fashion-MNIST dataset, outperforming the electrical approach (87.2%). This study provides an eco-friendly material platform for low-power neuromorphic vision systems and contributes to advances in brain-inspired computing and image processing.

All‐inorganic perovskite microcrystal films (MCFs) have emerged as promising candidates for next‐generation optoelectronic devices due to their excellent stability and outstanding photoelectronic performance. This work presents a solvent‐dynamics modulation strategy in which continuous antisolvent injection is employed to maintain a highly supersaturated precursor environment, thereby inhibiting Ostwald ripening. This approach not only prevents the dissolution of nucleation seeds and microcrystals but also enables precise control over dynamic nucleation and the directional growth of crystals. Consequently, it enables the scalable fabrication of high‑purity, highly crystalline CsPbBr _x Cl _{3 − x} microcrystalline films with tunable thickness and composition. The resulting CsPbCl ₃ microcrystal films exhibit thicknesses ranging from 12 to 47 µm and trap‐state densities as low as 3.514 × 10 ⁹ cm ^{− 3} , approaching bulk single‐crystal quality. Photoconductive detectors based on these films demonstrate excellent performance under 405 nm illumination, with a responsivity of 120 A/W, a detectivity of 1.87 × 10 ^{1 3} Jones, and a linear dynamic range of up to 159 dB, outperforming most reported CsPbCl ₃ devices. Moreover, this strategy is applicable to the synthesis of bandgap‐tunable (2.20–2.90 eV) CsPbBr _x Cl _{3 − x} microcrystal films, which exhibit an ultralow bowing parameter (b = 0.064 eV) indicative of near‐ideal alloy‐mixing behavior. This work provides a universal and scalable solution for solution‐processed high‐quality, bandgap‐tunable perovskite microcrystal films, paving the way for their applications in broadband and weak‐light‐detection optoelectronics.