Synergistic Dual-Anchor Passivation at Buried Interfaces Enabling High-Efficiency and Stable Perovskite Solar Cells.

The buried interfacial nonradiative recombination and carrier transport losses in perovskite solar cells, particularly caused by oxygen and iodide vacancy defects at the SnO/perovskite interface, critically limit their efficiency and stability. Herein, we propose a bifunctional passivation strategy using guanidinium phosphate (GAP), which spatially separates phosphate and guanidine groups to synergistically anchor SnO and perovskite interfaces. We systematically demonstrate the multifunctional synergistic roles of GAP molecules at the SnO/perovskite buried interface, where phosphate groups establish robust coordination bonds with the SnO surface to passivate oxygen vacancy defects while optimizing interfacial energy level alignment.

Colloidal InSb Quantum Dots Mid-Wave Infrared Photoconductive Detectors via One-Step Strong Acid Surface Treatment Strategy.

Colloidal InSb quantum dots (QDs) hold significant promise in infrared photodetection. However, the current InSb QDs suffer from poor carrier mobility and limited spectral response (<1.8 μm) due to complex surface structure and high sensitivity to hydrolysis and oxidation.

Unraveling the Role of Ligands Adsorption/Desorption on Photoluminescence Blinking in Single Water-Soluble InP-Based Quantum Dots.

Water-soluble quantum dots (QDs) face the challenges of photoluminescence (PL) blinking accompanied by photodegradation due to ligand desorption, which pose barriers to the implementation of QDs in their optical and optoelectronic applications. Here, we demonstrate the critical role of ligand adsorption/desorption dynamics in modulating PL blinking behaviors and photostability of water-soluble InP-based QDs at the single-dot level. Pre-adding excess ligands to water-soluble QDs can redirect ligand adsorption/desorption dynamics toward adsorption dominance and effectively passivate surface traps induced by dilution, converting PL blinking types from band-edge carrier blinking (BC-blinking) to Auger-blinking dominance.

Unveiling Energy Loss Mechanisms to Empower Ternary Organic Solar Cells with over 20% Efficiency: A Systematic Oligomeric Approach.

In organic solar cells (OSCs), the ternary strategy is a mainstream approach to obtaining highly efficient OSCs. A deeper understanding of working mechanisms and the material selection criteria for boosting open-circuit voltage (V) is essential for further OSC breakthrough. Through a modular design principle, a series of oligomeric donors - 5BDD, 5BDD-F, 5BDT-F, and 5BDT-Cl - with similar molecular configurations but varying HOMO levels is systematically designed.

Constructing Cation-π Interactions within Thermally Activated Delayed Fluorescence Polysiloxanes for High-Efficiency Non-Doped and Flexible OLEDs.

High-efficiency thermally activated delayed fluorescence (TADF) polymer is one of the excellent choices for solution-processable electroluminescent devices due to their 100% theoretical exciton utilization. Herein, different from the previous TADF copolymers with carbon-carbon main-chains, TADF polymers with silicon-oxygen main-chains are innovatively prepared by easily combing polysiloxanes with TADF and host units. The flexible polysiloxane chains are rigidified by the cation-π interaction between the electropositive silicon atoms and TADF units, resulting in reduced vibrational relaxation and thus the narrow full width at half maximum and high photoluminescence quantum efficiency.

Dynamic nanodomains dictate macroscopic properties in lead halide perovskites.

Lead halide perovskites have emerged as promising materials for solar energy conversion and X-ray detection owing to their remarkable optoelectronic properties. However, the microscopic origins of their superior performance remain unclear. Here we show that low-symmetry dynamic nanodomains present in the high-symmetry average cubic phases, whose characteristics are dictated by the A-site cation, govern the macroscopic behaviour.

Secondary Donor Engineering for High-Efficiency Orange-Red Thermally Activated Delayed Fluorescence Emitters.

Achieving efficient orange-red emission in thermally activated delayed fluorescence (TADF) emitters remains challenging due to the hard to achieve great balance between a small singlet-triplet energy gap and high radiative decay rates. In this study, a modification site engineering strategy for secondary donors to optimize excited-state properties for orange-red emitters is proposed. Two isomeric emitters, ND28DBT and ND37DBT, were synthesized by introducing dibenzothiophene (DBT) units at different positions of a naphthalimide-dimethylacridine (NAI-DMAc) core.

Rational Regulation of Layer-by-Layer Processed Active Layer via Trimer-Induced Pre-Swelling Strategy for Efficient and Robust Thick-Film Organic Solar Cells.

Thick-film (>300 nm) organic solar cells (OSCs) have garnered intensifying attention due to their compatibility with commercial roll-to-roll printing technology for the large-scale continuous fabrication process. However, due to the uncontrollable donor/acceptor (D/A) arrangement in thick-film condition, the restricted exciton splitting and severe carrier traps significantly impede the photovoltaic performance and operability. Herein, combined with layer-by-layer deposition technology, a twisted 3D star-shaped trimer (BTT-Out) is synthesized to develop a trimer-induced pre-swelling (TIP) strategy, where the BTT-Out is incorporated into the buried D18 donor layer to enable the fabrication of thick-film OSCs.

Reducing Sintering Temperature While Optimizing Electrical Properties of BCZT-Based Lead-Free Ceramics by Adding MnO as Sintering Aid.

In order to reduce the sintering temperature, MnO was used as a sintering aid to prepare [(BaCa)(DyTb)](ZrTi)O-x mol% MnO (BCDTZT-x mol% MnO, x = 0.05, 0.2, 0.

Integratable all-solid-state thin-film microbatteries.

Large-scale integration of microbattery systems on chips has long been hindered by the technical barrier between electrochemistry and microelectronics, particularly in terms of the compatibility of microbattery cells and their collective manufacturability. In this work, a silicon-based all-solid-state thin-film microbattery cell is developed at low temperatures for on-chip integration applications. Stress management at the interfaces covering both the resistance to interfacial fracture and the stress dissipation through strain regulation enables microbattery cells to deliver a high-rate performance (34.

High-Performance Solution Processable Red TADF-OLED with External Quantum Efficiency Exceeding 28% Using a Multi-Resonance Emitter Host.

Achieving high-efficiency soluble red thermally activated delayed fluorescence (TADF) emitters remains a substantial challenge owing to the constraints imposed by the energy-gap law. In this study, an asymmetric pyrene-azaacene derivative, named PBCNT, is prepared and characterized, featuring a strong electron-donating tert-butyl diphenylamine moiety and an electron-withdrawing cyano group. PBCNT exhibits intense red emission with a peak wavelength of 664 nm in a toluene solution.

Narrowband Emissive Solution-Processed Polymer Organic Light-Emitting Diodes with External Quantum Efficiency Above 30.

Achieving both high-efficiency and narrowband emission in thermally activated delayed fluorescence (TADF) polymers remains a formidable challenge. In this work, a proof of concept for narrowband-emissive TADF polymers with a partially conjugated structure is proposed by embedding a silicon─carbon σ-bond saturated spacer between the multiresonance (MR) TADF unit and the polycarbazole backbone. A series of TADF polymers PSix (x = 1, 3, and 6) is then prepared and characterized.

3D-Printed Flexible and Integrable Asymmetric Microsupercapacitors with High-Areal-Energy-Density.

3D-Printed quasi-solid-state microsupercapacitors (MSCs) present immense potential as next-generation miniature energy storage devices, offering superior power density, excellent flexibility, and feasible on-chip integration. However, the challenges posed by formulating 3D printing inks with high-performance and ensuring efficient ionic transport in thick electrodes hinder the development of advanced MSCs with high areal energy density. Herein, we report 3D-printed ultrahigh-energy-density asymmetric MSCs with latticed electrodes, fabricated using Ni-Co-S/Co(OH)/carbon nanotubes/reduced graphene oxide (Ni-Co-S/Co(OH)/CNTs/rGO) positive electrode ink and activated carbon (AC)/CNTs negative electrode ink.

Highly stable inverted perovskite solar cells with all-inorganic selective contact using iron-doped zinc oxide.

Perovskite solar cells (PSCs) have achieved remarkable performance advancements over the past decade. In inverted p-i-n PSCs, commonly utilized electron transport layers (ETL), such as C60 and PCBM, are associated with notable stability challenges and high production costs. This study reports on a novel and highly stable perovskite solar cell that employs iron-doped zinc oxide (FZO) nanoparticles as the ETL and nickel oxide (NiOx) as the hole transport layer, demonstrating a power conversion efficiency (PCE) of ∼12%.

Achieving High-Performance Organic Long Persistent Luminescence Materials via Manipulation of Radical Cation Stability.

Organic long persistent luminescence (OLPL) materials, with their hour-long afterglow, hold great promise across numerous applications, yet their performance lags behind that of inorganic counterparts. A deeper understanding of the underlying photophysical mechanisms, particularly the effective control of radical intermediates, is essential for developing high-performance OLPL materials; while systematic studies on the intrinsic stability of radical intermediates and their impact on OLPL performance remain scarce. Here biphenyl groups is introduced into a luminophore-matrix-donor three-component OLPL system.

Low-Volatility Fused-Ring Solid Additive Engineering for Synergistically Elongating Exciton Lifetime and Mitigating Trap Density Toward Organic Solar Cells of 20.5% Efficiency.

Volatile solid additives (VSAs) with single or fused-ring structures have attracted much attention for enhancing power conversion efficiencies (PCEs) of organic solar cells (OSCs). While the working mechanisms of high-volatility single-ring additives have been well studied, the influence of low-volatility fused-ring VSAs on molecular aggregations and exciton/carrier dynamics remains still unclear. Herein, 3,6-dibromothieno[3,2-b]thiophene (3,6TTBr) is selected as a representative low-volatility fused-ring VSA to elucidate its working mechanism.

In-Situ Hydrogenation Strategies on Vanadium Oxide Hole-Selective Contact for Efficiency Crystalline Silicon Solar Cells.

Surface passivation and contact resistance are two main parameters to optimize the photoelectric performance of crystalline silicon/transition metal oxides (c-Si/TMO) heterojunction solar cells. However, most studies focus on the introduction of dielectric layers at the heterojunction interface to improve the passivating contact performance, with limited attention given to optimizing the TMO film for improved photoelectric performance. Herein, an in-situ hydrogen plasma treatment (HPT) process is employed to modulate the photoelectric properties of vanadium oxide (VO) film as well as the c-Si/VO interface.

Regulating the Spatially Folded Arrangement of Donor and Acceptor Units To Achieve Efficient Orange-Red Thermally Activated Delayed Fluorescence.

Achieving efficient long-wavelength organic light-emitting diodes (OLEDs) remains a challenge due to the energy gap law, which leads to increased non-radiative decay rates as the emission wavelength shifts to longer regions. Herein, a strategy of constructing folded three-dimensional architectures is proposed to explore new orange-red thermally activated delayed fluorescence (TADF) emitters with through-space charge transfer characteristics. Innovatively, naphthalene is selected as a bridge to connect O-bridged triphenylamine donor and planar dibenzo[a,c]phenazine acceptor respectively via simple Suzuki-Miyaura Coupling.

Surface Copassivation Strategy for Developing Water-Soluble InP Colloidal Quantum Dots with High Luminescence and Suppressed Blinking.

Colloidal quantum dots (QDs) are promising emitters for biological applications because of their excellent fluorescence, convenient surface modification, and photostability. However, the toxic cadmium composition in the state-of-the-art QDs and their inferior properties in the aqueous phase greatly restrict further use. The performance of water-soluble indium phosphide (InP) QDs lags far behind those of Cd-containing counterparts due to the lack of effective surface protection.

High-Performance Solution-Processable Organic Light-Emitting Diode Based on a Narrowband Near-Ultraviolet Emitter and a Hot Exciton Strategy.

Achieving high efficiency narrowband near-ultraviolet (NUV) emitters in organic light emitting diode (OLED) is still a formidable challenge. Herein, a proof-of-concept hybridized local and charge transfer (HLCT) molecule, named ICz-BO, is prepared and characterized, in which both multiresonant (MR) skeletons are integrated via conjugation connection. A slightly distorted structure and weak intramolecular charge transfer (CT) interaction between two MR subunits lead to a high-lying reverse intersystem crossing (h-RISC) channel of T→S, also evidenced by both experimental and calculated results.

An Ultrasensitive and Broad-Spectrum MoS Photodetector with Extrinsic Response Using Surrounding Homojunction.

As unique building blocks for advancing optoelectronics, 2D semiconducting transition metal dichalcogenides have garnered significant attention. However, most previously reported MoS photodetectors respond only to visible light with limited absorption, resulting in a narrow spectral response and low sensitivity. Here, a surrounding homojunction MoS photodetector featuring localized p-type nitrogen plasma doping on the surface of n-type MoS while preserving a high-mobility underlying channel for rapid carrier transport is engineered.

Over 21% Efficient Cesium Lead Triiodide Solar Cell Enabled by Molten Salt Accelerating the Crystallization Processes.

High-quality CsPbI with low defect density is indispensable for acquiring excellent photoelectric performance. Meticulous regulation of the CsPbI crystal growth processes is both feasible and efficacious in enhancing the quality of perovskite films. In this study, the cesium formate (CsFo) is introduced.

Preparation and Properties of Nb-Doped BCZT-Based Ceramic Thick Films by Scraping Process.

A bottleneck characterized by high strain and low hysteresis has constantly existed in the design process of piezoelectric actuators. In order to solve the problem that actuator materials cannot simultaneously exhibit large strain and low hysteresis under relatively high electric fields, Nb-doped 0.975(BaCa)[(ZrTi)Nb]O-0.

Polymer-Based Room-Temperature Phosphorescence Materials Exhibiting Emission Lifetimes up to 4.6 s Under Ambient Conditions.

The long-emission-lifetime nature of room-temperature phosphorescence (RTP) materials lays the foundation of their applications in diverse areas. Despite the advantage of mechanical property, processability and solvent dispersity, the emission lifetimes of polymer-based room-temperature phosphorescence materials remain not particularly long because of the labile nature of organic triplet excited states under ambient conditions. Specifically, ambient phosphorescence lifetime (τ) longer than 2 s and even 4 s have rarely been reported in polymer systems.