In this paper, a new nonlinear companding technique, called "exponential companding", is proposed to reduce the high Peak-to-Average Power Ratio (PAPR) of Orthogonal Frequency Division Multiplexing (OFDM) signals. Unlike /spl mu/-law scheme, which enlarges only small signals so that increases average power, schemes based on exponential technique adjust both large and can keep power at same level. By transforming original OFDM into uniformly distributed (with specific degree), effectively...

The development of polymerized small-molecule acceptors has boosted the power conversion efficiencies (PCEs) all-polymer organic photovoltaic (OPV) cells to 17%. However, polymer donors suitable for OPV are still lacking, restricting further improvement their PCEs. Herein, a new donor named PQM-Cl is designed and its performance explored. negative electrostatic potential low average local ionization energy distribution surface enable efficient charge generation transfer process. When...

Abstract Although PEDOT:PSS is the most prominently used conducting polymer as hole transporting layer (HTL) material in organic solar cells (OSCs), strong acidity of has been proved to cause corrosion on electrodes, which largely responsible for device instability. At present, development a non‐corrosive and stable PEDOT with comparable performance remains great challenge field. Herein, solid n ‐PEDOT:POM powder neutral pH synthesized by utilizing polyoxometalate (POM) an oxidizing reagent,...

Silicon nanocrystals can provide the outstanding imaging capabilities of toxic heavy-metal-based quantum dots without employing heavy metals and have potential for rapid progression to clinic. Understanding toxicity silicon (SiQDs) is essential realizing this potential. However, existing studies SiQD biocompatibility are limited, with no systematic from small-animal large-animal that more clinically relevant. Here, we test response both mice monkeys high intravenous doses a nanoconstruct...

Novel type II CdTe−CdSe semiconductor nanocrystal heterostructures (SNCHs) with multiple-branched rod morphology were synthesized by epitaxial growth of CdSe from CdTe nanocrystals in solution, and the SNCHs characterized transmission electron microscopy (TEM), high-resolution TEM (HRTEM), energy-dispersive spectrometry (EDS), X-ray diffraction (XRD) analysis. The are composed a core branches, most heterostructured have about 10 branched rods thickness 3−5 nm length 10−30 nm. absorption...

With the rapid advance of organic photovoltaic materials, energy level structure, active layer morphology, and fabrication procedure solar cells (OSCs) are changed significantly. Thus, photoelectronic properties many traditional electrode interlayers have become unsuitable for modifying new layers; this limits further enhancement in OSC efficiencies. Herein, a design strategy tailoring end-capping unit, ITIC, to develop cathode interlayer (CIL) material achieving high power conversion...

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTSolution-Processable Star-Shaped Photovoltaic Organic Molecule with Triphenylamine Core and Benzothiadiazole−Thiophene ArmsJing Zhang†‡, Yi Yang†‡, Chang He†, Youjun He†‡, Guangjin Zhao†‡, Yongfang Li*†View Author Information† Beijing National Laboratory for Molecular Sciences, CAS Key of Solids, Institute Chemistry, Chinese Academy 100190, China‡ Graduate University 100049, China*Corresponding author: E-mail...

Abstract Here, a novel super‐long, ultraviolet A region (UVA), persistent luminescent (PerL) material, LiYGeO 4 :Bi 3+ , is developed. After irradiation at 254 nm for 10 min, the UVA PerL of can persist more than 300 h. In addition, also possesses strong emission with power density 11.83 mW m −2 s after removal excitation source. Even 72 h, spectrum still be clearly detected, which same as photoluminescence and originated from Bi emitting centers. Furthermore, exhibits photostimulated...

Open AccessCCS ChemistryRESEARCH ARTICLE1 Mar 2022Highly Stable Organic Solar Cells Based on an Ultraviolet-Resistant Cathode Interfacial Layer Qing Liao, Qian Kang, Yi Yang, Zhong Zheng, Jinzhao Qin, Bowei Xu and Jianhui Hou Liao State Key Laboratory of Polymer Physics Chemistry, Beijing National for Molecular Sciences, Institute Chinese Academy 100190 University 100049 , Kang Yang Zheng Qin *Corresponding authors: E-mail Address: [email protected]...

The correlation between molecular structure and photovoltaic performance is lagging for constructing high-performance indoor organic (OPV) cells. Herein, this relationship investigated in depth by employing two medium-bandgap nonfullerene acceptors (NFAs). newly synthesized NFA of FTCCBr exhibits a similar bandgap energy level, but much stronger dipole moment larger average electrostatic potential (ESP) compared with ITCC. After blending the polymer donor PB2, PB2:ITCC PB2:FTCCBr blends...

Abstract Electrode interlayer plays a pivotal role in the performance enhancement of optoelectronic devices. At present, poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and molybdenum oxide are two most popular anode (AIL) materials organic devices, but both them have obvious drawbacks practical use. Owing to lack suitable semiconductor with energy level, development AIL as alternatives PEDOT:PSS MoO 3 remains challenge. Herein, series Dawson‐type polyoxometalates (POMs)...

Abstract Interlayer materials play a critical role in fabricating high‐performance organic solar cells (OSCs). Herein, cross‐linked and n ‐doped cathode interlayer (CIL), namely, c ‐NDI:N, for highly efficient stable is developed. This study demonstrates that the combination of high‐temperature cross‐linking along with ‐doping endows ‐NDI:N@200 °C film excellent robustness, high conductivity, good morphology. The inverted OSC using as CIL exhibits highest power conversion efficiency 17.5%,...

Abstract Due to the mutual repulsion between their hydrophilic surface terminations and high energy facilitating random restacking, 2D MXene nanosheets usually cannot self-assemble into 3D macroscopic gels with various applications in absence of proper linking agents. In this work, a rapid spontaneous gelation Ti 3 C 2 T x very low dispersion concentration 0.5 mg mL −1 multifunctional architectures under moderate centrifugation is illustrated. The as-prepared exhibit reconfigurable internal...

A new polythiophene derivative with phenothiazine−vinylene (PTZV) conjugated side chains, PTZV−PT, was synthesized through the Stille coupling reaction and characterized by 1H NMR, elemental analysis, GPC, TGA, DSC, UV−vis absorption spectroscopy, photoluminescence cyclic voltammetry. The polymer is soluble in common organic solvents possesses good thermal stability 5% weight loss at temperature of 397 °C Tg 140 °C. weight-average molecular PTZV−PT 5.45 × 104 polydispersity index 1.48....

Abstract Strong intermolecular interactions usually result in decreases solubility and fluorescence efficiency of organic molecules. Therefore, amorphous materials are highly pursued when designing solution‐processable, electroluminescent In this paper, a non‐planar binaphthyl moiety is presented as way reducing four binaphthyl‐containing molecules ( BNCM s): green‐emitting BBB TBT well red‐emitting BTBTB TBBBT , designed synthesized. The photophysical electrochemical properties the...

A new solution-processable biarmed organic molecule with triphenylamine (TPA) core and benzothiadiazole-hexylthiophene (BT-HT) arms, B(TPA-BT-HT), has been synthesized by a Heck reaction, characterized UV−vis absorption, cyclic voltammetry, theoretical calculation. Photovoltaic properties of B(TPA-BT-HT) as light-harvesting electron-donating material in solar cells (OSCs), [6,6]-phenyl-C61-butyric acid methyl ester (PC60BM) or [6,6]-phenyl-C71-butyric (PC70BM) acceptors, were systematically...

Au@Pd core-shell nanodendrites were synthesized by reducing H(2)PdCl(4) with ascorbic acid onto the surface of Au polyhedra at room temperature. The consisting a core and nanoporous Pd shell, exhibited plasmonic properties higher catalytic activity in comparison nanocubes.

Abstract Organic solar cells (OSCs) have attracted much attention due to their advantages in fabricating flexible and semi‐transparent devices. Especially, the light weight, flexibility spectral adjustability make OSCs superior silicon, perovskite other thin film based applications of integrated photovoltaic devices wearable electronics. In OSCs, transparent conducting electrodes (TCEs) play a key role obtaining high performances. Among various TCEs, silver nanowire (AgNW) has become...

Abstract To develop the low‐cost nonfullerene acceptors (NFAs), two fully non‐fused NFAs (TBT‐2 and TBT‐6) with ortho ‐bis((2‐ethylhexyl)oxy)benzene unit different side chains onto thiophene‐bridges are synthesized through highly efficient synthetic procedures. Both show good planarity, low optical gaps (≈1.51 eV), deep highest occupied molecular orbital levels (≤‐5.77 eV). More importantly, single‐crystal structure of TBT‐2 shows compact arrangement due to existence intramolecular...

The ability of achieving high efficiency makes tandem organic photovoltaics (PVs) a competitive technique in potential indoor applications. Except efficiency, reliable energy supply also calls for outstanding stability. However, unavoidable unstable voltage from the circuit control system light sources like emitting diodes (LED) and incandescent lamps would cause carrier density fluctuation device fatigue driven by periodic light/dark switching. In this work, strobing-induced within bulk...