Abstract Among all inorganic halide perovskite photovoltaic materials, CsPbIBr 2 exhibits the most balanced features in terms of bandgap and stability. However, poor quality solution‐processed films impedes further optimization cells performance. Herein, a facile intermolecular exchange strategy for film is demonstrated, wherein an optimized methanol solution CsI spin‐coated on precursor conventional one‐step route. It surprisingly produces full‐coverage pure‐phase featured with average...

The inferior crystallinity and phase stability of CsPbI2Br films have severely hindered the development carbon-based, all-inorganic perovskite solar cells (PSCs). Herein, we demonstrate preparation by top-seeded solution growth (TSSG) technique. It is performed through spin-coating CH3NH3Br (MABr) atop precursor film prior to annealing, during which seeds are generated it. These not only serve as nuclei regulate grains but also provide additional Br– anions generate a thin Br-rich layer...

A bi-molecular kinetic competitive adsorption strategy was proposed to circumvent the dimensional structural transformation which has been widely observed on film surface passivated by conventional methods.

Organic–inorganic lead halide perovskite compounds are very promising materials for high-efficiency solar cells. But how to fabricate high-quality perovksite films under controlled humidity conditions is still an important issue due their sensitivity moisture. In this study, we investigated the influence of ambient on crystallization and surface morphology one-step spin-coated films, as well performance cells based these films. On basis experimental analyses thin film growth theory, conclude...

All-inorganic, Cl-based perovskites are promising for visible-blind UV photodetectors (PDs), particularly the self-powered ones. However, devices rarely reported until now since low solubility of raw materials hinders significantly thickness and electronic quality solution-processed perovskite films. Herein, we demonstrate a simple intermediate phase halide exchange method to prepare desired dual-phase CsPbCl3–Cs4PbCl6 It is achieved by spin-coating certain dose CH3NH3Cl/CsCl solution onto...

Perovskite CsPbIBr2 is attracting ever-increasing attention for carbon-based, all-inorganic solar cells, owing to its well-balanced band gap and stability features. However, significant interfacial recombination of charge carriers in cells fabricated with this active layer, which intrinsically associated the unwanted conduction misalignment between commonly used TiO2 electron transport has limited power conversion efficiency (PCE) values. Herein, we demonstrate successful alignment...

Abstract A novel interface design is proposed for carbon-based, all-inorganic CsPbIBr 2 perovskite solar cells (PSCs) by introducing interfacial voids between TiO electron transport layer and absorber. Compared with the general engineering strategies, this exempts any extra modification in final PSC. More importantly, produced thermal decomposition of 2-phenylethylammonium iodide trigger three beneficial effects. First, they promote light scattering film thereby boost absorption ability...

Inorganic halide perovskite CsPbIBr2 possesses the most balanced band gap and stability characters among all of concerned analogs for carbon-based, all-inorganic solar cells that are free any hole-transporting layers noble-metal electrodes. Yet, current seem to deliver lowest record efficiency. This is originally plagued by a serious energy loss (Eloss) in cells, which thus limits their open-circuit voltages (Voc) severely. Herein, we demonstrate light-processing technology can overcome this...

Organolead trihalide perovskites (OTPs) such as CH3NH3PbI3 (MAPbI3) have attracted much attention the absorbing layer in solar cells and photodetectors (PDs). Flexible OTP devices also been developed. Transparent electrodes (TEs) with higher conductivity, stability, flexibility are necessary to improve performance of flexible devices. In this work, patterned Au nanowire (AuNW) networks high conductivity stability prepared used TEs self-powered MAPbI3 PDs. These PDs show peak external quantum...

The resistance of the perovskite CH3NH3PbI3 film was found to decrease significantly in seconds when exposed an NH3 atmosphere at room-temperature, and recover its original value out environment.

Inorganic halide perovskite CsPbIBr2 with superior stability is regarded as a promising candidate for photovoltaic cells. However, high-temperature annealing recipe (∼300 °C) generally required to fulfill the crystallization of pure-phase films. Herein, we report that precursor solution aging time strikingly affects kinetics film in one-step spin-coating method. Upon control this subtle factor, temperature and full-coverage films can be greatly lowered 100 °C. Carbon-based all-inorganic...

The field emission (FE) properties of TiO2 nanotube arrays (TNAs) synthesized by anodization are dramatically improved after hydrogenation at various temperatures in a range 400–550 °C. Compared with pristine TNAs, the turn-on fields hydrogenated TNAs (H:TNAs) significantly decreased from 18.23 to 1.75 V μm−1, and closely related temperature. Importantly, optimized sample H:TNAs prepared 550 °C shows excellent FE performances involving both low high current density 4.0 mA cm−2 4.50V...

Abstract Tin fluoride (SnF 2 ) is widely used as an effective additive for lead‐free tin‐based perovskite solar cells. However, the function of SnF and mechanism in improving film morphology are still not clear. In this work, it clearly demonstrated that can play a crucial role crystal nucleation process. Due to limited solubility, creates more nucleuses growth therefore enables uniform thin with high coverage. It confirmed be applied both single crystal. As result tin‐fluoride‐assisted...

Herein, we demonstrate that the facile face-down annealing route which effectively confines evaporation of residual solvent molecules in one-step deposited precursor films can controllably enable formation (110) textured CH3NH3PbI3 consisting high-crystallinity well-ordered micrometer-sized grains span vertically entire film thickness. Such microstructural features dramatically decrease nonradiative recombination sites as well greatly improve transport property charge carries compared with...

Hematite (α-Fe2O3) is one of the most promising candidates for photoelectrodes in photoelectrochemical water splitting system. However, low visible light absorption coefficient and short hole diffusion length pure α-Fe2O3 limits performance splitting. Herein, to overcome these drawbacks, single-crystalline tin-doped indium oxide (ITO) nanowire core nanocrystal shell (ITO@α-Fe2O3) electrodes were fabricated by covering chemical vapor deposited ITO array with compact thin film using bath...

Abstract Due to the suitable bandgap, superior chemical and physical properties, β‐phase gallium oxide (β‐Ga 2 O 3 ) has great potential fabricate deep ultraviolet solar‐blind photodetectors (DUV PDs). However, low material quality, high growth cost, insufficient device performance, are urgently required be solved for practical applications. In this work, by using a vacuumfree, low‐cost mist vapor deposition method, quality β‐Ga single crystal films successfully heteroepitaxially grown on...

In this letter, we demonstrate a high performance lateral β-Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> solar-blind Schottky barrier photodiode (SBPD) with record detectivity (D*) and ultrahigh gain via carrier multiplication process. Due to the strong electric field, carriers generated under 254 nm light illumination undergo acceleration impact ionization, contributing internal...

This letter demonstrates a high performance β-Ga <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> solar-blind metal-oxide-semiconductor field-effect phototransistor (SBPT) with Hafnium Oxide (HfO ) Gate Dielectric. The SBPT shows Photo-to-dark-current ratio (PDCR) of 6.9×10 <sup xmlns:xlink="http://www.w3.org/1999/xlink">7</sup> , an I xmlns:xlink="http://www.w3.org/1999/xlink">254...

A high-quality CH3NH3PbI3 film is crucial in the manufacture of a high-performance perovskite solar cell. Here, recrystallization process via facile fumigation with DMF vapor has been successfully introduced to self-repair films poor coverage and low crystallinity prepared by commonly used one-step spin-coating method. We found that dendritic structures can spontaneously transform uniform ones full high adjusting cycles process. The mesostructured cells based on these repaired showed...

A mass of oxygen vacancies are successfully introduced into TiO2 nanotube arrays using low-cost NaBH4 as a reductant in liquid-phase environment. By controlling and adjusting the reduction time over range 0–24 h, doping concentration vacancy is controllable eventually reaches saturation. Meanwhile, thermal stability also investigated, indicating that part remain stable up to 250 °C. In addition, this strategy significantly lowers requirements instruments cost. More interesting, reduced show...