Organic-inorganic halide perovskite is believed to be a potential candidate for high efficiency solar cells because power conversion (PCE) was certified more than 22%. Nevertheless, mismatch of PCE due current density (J)-voltage (V) hysteresis in an obstacle overcome. There has been much lively debate on the origin J-V hysteresis; however, effective methodology solve hysteric problem not developed. Here we report universal approach hysteresis-free via defect engineering. A severe observed...

Abstract With the aim of preparing a high performance conductive ink, we sought to control surface chemistry Cu nanoparticles so as minimize oxidation. Specifically, oxide layer on synthesized in ambient atmosphere was minimized by adjusting molecular weight poly( N ‐vinylpyrrolidone) capping molecules, confirmed resolution transmission electron microscopy and X‐ray photoelectron spectroscopy analyses. In addition, demonstrate that minimizing thickness layer, granular films with good...

NiO is a wide band gap p-type oxide semiconductor and has potential for applications in solar energy conversion as hole-transporting layer (HTL). It also good optical transparency high chemical stability, the capability of aligning edges to perovskite (CH3NH3PbI3) layers. Ultra-thin un-doped films with much less absorption loss were prepared by atomic deposition (ALD) highly precise control over thickness without any pinholes. Thin enough (5–7.5 nm thickness) few time Debye length (LD = 1–2...

The random circuit breaker network model is proposed for unipolar resistance switching behavior. This describes reversible dynamic processes involving two quasi-metastable states. formation and rupture of conducting channels (see figure) in the polycrystalline TiO2 thin films may be analyzed by self organized avalanche process model. Supporting information this article available on WWW under http://www.wiley-vch.de/contents/jc_2089/2008/adma200702024_s.pdf or from author. Please note:...

A template-directed synthesis strategy is an ideal tool to fabricate oxide nanotubes in that their physical dimensions can be precisely controlled and monodisperse samples harvested large quantity. The wall thickness of the controllable by varying deposition conditions, length diameter tailored accordance with templates used. wealth functional materials polymorphs deposited nanotubular structures various methods. This short review article describes recent progress made field template...

Abstract Despite the high power conversion efficiency (PCE) of perovskite solar cells (PSCs), poor long‐term stability is one main obstacles preventing their commercialization. Several approaches to enhance PSCs have been proposed. However, an accelerating test at temperature under operating conditions in ambient air remains still be demonstrated. Herein, interface‐engineered stable with inorganic charge‐transport layers are shown. The highly conductive Al‐doped ZnO films act as efficient...

The conventional precursor mixture based on highly pure and expensive PbI2 (purity >99.99%) is problematic in commercializing perovskite solar cells (PSCs) because of a large deviation the batch-to-batch photovoltaic performance due to underlying nonstoichiometry and/or nonperovskite phase. Here, we report reproducibly efficient (>21%) PSCs ambient-temperature-stable δ-phase FAPbI3 powder, synthesized by reacting (either homemade or low-grade commercial product with purity <99%)...

For scalable perovskite solar cells (PSCs), deposition of a homogeneous and high-quality film on large area (>100 cm2) is prerequisite. Conventional solutions for spin-coating small areas usually contain polar aprotic solvents with high boiling point, which difficult to adopt large-area bar coating because the uncontrollable slow drying process due strong interaction between solvent Lewis acidic PbI2 or perovskite. Thus, precursor solution plays vital role in success coating. Here we report...

Although post-treatment has been regarded as one of the effective ways to passivate underlying defects in perovskite solar cells (PSCs), little attention paid how select suitable passivation agents. Here, we report on dependence photovoltaic performance acid dissociation constant (Ka) agents guide a criterion for selecting PSCs. Power conversion efficiency (PCE) is increased after with high-pKa (10.6) cyclohexylammonium chloride (CYCl), whereas low-pKa (4.6) anilinium (ANCl) decreases PCE...

Abstract Insufficient charge extraction at the interfaces between light‐absorbing perovskites and transporting layers is one of drawbacks state‐of‐the‐art perovskite solar cells. Surface treatments and/or interface engineering are necessary to approach Shockley–Queisser limit. In this work, novel 2D layered perovskites, such as CHA 2 PbI 4 (CHAI = cyclohexylammonium iodide) CHMA (CHMAI cyclohexylmethylammonium iodide), introduced in 3D hole by a simple solution process 2D/3D heterojunction...

Abstract Hygroscopic and acidic nature of organic hole transport layers (HTLs) insisted to replace it with metal oxide semiconductors due their favorable charge carrier long chemical stability. Apart from large direct bandgap high optical transmittance, ionization energy in the range −5.0 −5.4 eV leads use NiO as HTL good energetic matching lead halide perovskites. Analyzing X‐ray photoelectron spectroscopic (XPS) data NiO, is speculated that p‐type conductivity related NiOOH or Ni 2 O 3...

The contrast mechanisms of domain imaging experiments assisted by atomic force microscope (AFM) have been investigated model on nonpiezoelectric (silicon oxide) and piezoelectric [Pb(Zr,Ti)O3] thin films. first step was to identify the electrostatic charge effects between tip, cantilever, sample surface. second explore tip–sample interaction. static deflection cantilever measured as a function dc bias voltage (Vdc) applied bottom electrode (n-type Si wafers) for noncontact contact modes. In...

Excellent color purity with a tunable band gap renders organic-inorganic halide perovskite highly capable of performing as light-emitting diodes (LEDs). Perovskite nanocrystals show photoluminescence quantum yield exceeding 90%, which, however, decreases to lower than 20% upon formation thin film. The limited film has been formidable obstacle for development efficient LEDs. Here, we report method luminescent MAPbBr3 (MA = CH3NH3) formed in situ based on nonstoichiometric adduct and...

A hysteresis-free and high-efficiency planar perovskite solar cell was developed using a solution-processed SnO₂electron-transporting layer (ETL).

In this study, an aluminum-doped zinc oxide (AZO) layer was used as a transparent conducting (TCO) in ZnO nanowire (NW)-based dye-sensitized solar cells (DSSCs). The well aligned, single crystalline NW arrays that were grown on the AZO films exhibited better DSSC performance (an increased photocurrent density and fill factor) than those fluorine doped tin (FTO) films. I−V characteristics electrochemical impedance spectroscopy measurements for FTO clearly showed superior caused by facilitated...

Epitaxial growth suffers from the mismatches in lattice and dangling bonds arising different crystal structures or unit cell parameters. Here, we demonstrate epitaxial of 2D MoS2 ribbon on 1D CdS nanowires (NWs) via surface subsurface defects. The interstitial Cd0 (12̅10) plane [0001]-oriented NWs are found to serve as nucleation sites for interatomically bonded [001]-oriented MoS2, where perfect match (∼99.7%) between (101̅1) (002)-faceted in-plane result coaxial ribbon/CdS heterojunction....

Extended understandings of perovskite solar cells by recent ALD application studies as well challenges toward enhancing the efficiency and stability will be addressed.

Sb₂Se₃ nanoneedles for use as a photocathode water splitting are fabricated by facile spin-coating. After sequential surface modification with n-TiO₂ and Pt, remarkable photocurrent of 2 mA cm⁻² at 0 V_RHE is realized.

We report a novel approach for fast phase transition of FAPbI₃ at low-temperature and the effective removal interfacial recombination in MAPbI₃.

Both enhancing the excitons' lifetime and ingeniously controlling spatial charge transfer are key to realization of efficiently photocatalytic artificially photosynthetic devices. Nanostructured metal/metal-oxide interfaces often exhibit improved energy conversion efficiency. Understanding surface potential changes nano-objects under light illumination is crucial in photoelectrochemical cells. Under ultraviolet (UV) illumination, here, we directly observed separation phenomena at...

We describe the spontaneous formation of composite chalcogenide materials that consist two-dimensional (2D) dispersed in bulk and their unusual charge transport properties for application hydrogen evolution reactions (HERs). When MoS