It remains full of challenge for extending short-wave infrared (SWIR) spectral response and weak-light detection in the context of broad spectral responses for phototransistor. In this work, a novel poly(2,5-bis(4-hexyldodecyl)-2,5-dihydro-3,6-di-2-thienyl-pyrrolo[3,4-c]pyrrole-1,4-dione-alt-thiophene) (PDPPT3-HDO):COTIC-4F organic bulk-heterojunction is prepared as active layer for bulk heterojunction phototransistors. PDPPT3-HDO serves as a hole transport material, while COTIC-4F enhances the absorption of SWIR light to 1020 nm. As a result, smooth and connected PDPPT3-HDO film is fabricated by blade coating method and exhibits high hole mobility up to 2.34 cm²·V⁻¹·s⁻¹ with a current on/off ratio of 4.72 × 10⁵ in organic thin film transistors. PDPPT3-HDO:COTIC-4F heterojunction phototransistors exhibit high responsivity of 2680 A·W⁻¹ to 900 nm and 815 A·W⁻¹ to 1020 nm, with fast response time (rise time ~ 20 ms and fall time ~ 100 ms). The photosensitivity of the heterojunction phototransistor improves as the mass ratio of non-fullerene acceptors increases, resulting in an approximately two orders of magnitude enhancement compared to the bare polymer phototransistor. Importantly, the phototransistor exhibits decent responsivity even under ultra-weak light power of 43 μW·cm⁻² to 1020 nm. This work represents a highly effective and general strategy for fabricating efficient and sensitive SWIR light photodetectors.

The active site engineering of electrocatalysts, as one of the most economical and technological approaches, is a promising strategy to enhance the intrinsic activity and selectivity towards electrochemical CO₂ reduction reaction. Herein, an indium-based porphyrin framework (In-TCPP) with a well-defined structure, highly dispersed catalytic center, and good stability was constructed for efficient CO₂-to-formate conversion. In-TCPP could achieve a high Faraday efficiency for formate (90%) and a cathodic energy efficiency of 63.8% in flow cells. In situ attenuated total reflectance Fourier transform infrared spectroscopy and density functional theory calculation confirm that the crucial intermediate is *COOH species which contributes to the formation of formate. This work is expected to provide novel insights into the precise design of active sites for high-performance electrocatalysts towards electrochemical CO₂ reduction reaction.

Rational design and synthesis of multimetallic nanostructures (NSs) are fundamentally important for electrochemical CO₂ reduction reaction (CO₂RR). Herein, a multi-step seed-mediated growth method is applied to synthesize asymmetric AuAgCu heterostructures using Au nanobipyramids as nucleation seeds, in which their composition and structures are well controlled. We find that the selectivity of C₂ products for CO₂RR could be effectively regulated by tandem catalysis and electronic effect over trimetallic AuAgCu heterostructures. Particularly, the Faraday efficiency toward ethanol could reach up to 37.5% at a potential of −0.8 V versus reversible hydrogen electrode over asymmetric Au₁Ag₁Cu₅ heterostructures with segregated domains of three constituent metals. This work provides an efficient strategy for the synthesis of multicomponent architectures to boost their promising application in CO₂RR.

Photocatalytic water splitting (PWS) has attracted widespread attention as a sustainable method for converting solar to green hydrogen energy. So far PWS research has mainly focused on the development of artificial photocatalytic hydrogen production systems for pure water. It is more practically attractive to create systems for seawater, i.e., to reduce the cost of hydrogen production and make better use of naturally occurring water resources. Herein, brookite, anatase, and rutile TiO₂ nanoparticles are investigated as photocatalysts to explore the feasibility of such thought and have shown attractive hydrogen production performance under full solar spectrum without any sacrificial agent. It is worth noting that, brookite TiO₂, has more suitable band gap position and excellent photoelectric properties compared with anatase and rutile TiO₂, and has higher efficiency and stability in the process of hydrogen production. The photocatalytic hydrogen production rate of brookite TiO₂ can reach up to 1,476 μmol/g/h, the highest value reported for TiO₂-based systems and most other photocatalysts in seawater splitting under full spectrum. As the Cl⁻ ions in seawater go through a cycle of oxidation and reduction, no Cl₂ is detected in the solar hydrogen production from seawater.

Key challenges in the development of organic light-emitting transistors (OLETs) are blocking both scientific research and practical applications of these devices, e.g., the absence of high-mobility emissive organic semiconductor materials, low device efficiency, and color tunability. Here, we report a novel device configuration called the energy transfer organic light-emitting transistor (ET-OLET) that is intended to overcome these challenges. An organic fluorescent dye-doped polymethyl methacrylate (PMMA) layer is inserted below the conventional high-mobility organic semiconductor layer in a single-component OLET to separate the functions of the charge transport and light-emitting layers, thus making the challenge to essentially integrate the high mobility and emissive functions within a single organic semiconductor in a conventional OLET or multilayer OLET unnecessary. In this architecture, there is little change in mobility, but the external quantum efficiency (EQE) of the ET-OLET is more than six times that of the conventional OLET because of the efficient Förster resonance energy transfer, which avoids exciton-charge annihilation. In addition, the emission color can be tuned from blue to white to green-yellow using the source-drain and gate voltages. The proposed structure is promising for use with electrically pumped organic lasers.

Organic spin valve (OSV), one of the most promising and representative devices involving spin injection, transport and detection, has drawn tremendous attention owing to their ultra-long spin relaxation time in the field of molecular spintronics. Since the first demonstration of truly worked vertical OSV device in 2004, efforts in enhancement of high performance and pursuit of spin-related nature have been devoted in related field. It offers a new opportunity to develop the integrated flexible multi-functional arrays based on spintronics in the future. However, the unreliable working state in OSVs due to the lack of exploration on interface control will cause severe impact on the performance evaluation and further restrict their practical application. Herein, we focus on the recent progress in strategies for reliable fabrication and evaluation of typical OSVs in vertical configuration. Firstly, the challenges in protection of two spin interface properties and identification of spin-valve-like signals were proposed. Then, three points for attention including selection of bottom electrodes, optimization of organic spacer, and prevention of metal penetration to improve the device performance and reliability were mentioned. Particularly, various modified strategies to solve the "dead layer" issue were highlighted. Furthermore, we discussed the general protocols in the reliable evaluation of OSVs' performance and transport mechanism identification. Notably, several key fundamentals resulting in spurious magnetoresistance (MR) response were illustrated. Finally, we also highlighted the future perspectives on spintronic devices of organic materials.

The spinterface formed between ferromagnetic (FM) electrode and organic materials is vital for performance optimization in organic spin valve (OSV). Half-metallic Fe₃O₄ with drastic change in structure, conductivity and magnetic property near Verwey transition can serve as an intrinsic spinterface regulator. However, such modulating effect of Fe₃O₄ in OSV has not been comprehensively investigated, especially below the Verwey transition temperature (T_v). Here, we highlight the important role of Fe₃O₄ electrode in reliable-working and controllable Fe₃O₄/P3HT/Co polymer spin valves by investigating the magnetoresistance (MR) above and below T_v. In order to distinguish between different contributions to charge transport and related MR responses, the systematic electronic and magnetic characterizations were carried out in full temperature range. Particularly, the first-order metal-insulator transition in Fe₃O₄ has a dramatic effect on the MR enhancement of polymer spin valves at T_v. Moreover, both the conducting mode transformation and MR line shape modulation could be accomplished across T_v. This research renders unique scenario to multimodal storage by external thermodynamic parameters, and further reveals the importance of spin-dependent interfacial modification in polymer spin valves.

Organic light-emitting transistors (OLETs) integrate the functions of light-emitting diodes and field-effect transistors into a unique device, opening a new door for optoelectronics. However, there is still a challenge due to the absence of high quality organic semiconductors for OLETs. Herein, we reported a novel molecule 2,6-di(anthracen-2-yl)naphthalene (2,6-DAN), which exhibited mobility of up to 19 cm²·V^-1·s^-1 and an absolute fluorescence quantum yield of 37.09%, which are good values for organic semiconductors. Moreover, OLETs based on 2,6-DAN single crystals showed bright yellowish-green emission and well-balanced ambipolar charge transport. The excellent ratio of hole to electron mobility can reach up to 0.86, which is superior to most single-component OLETs in typical device configurations reported so far.