A5091604634- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Organic Light-Emitting Diodes Research
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Thin-Film Transistor Technologies
- Nanowire Synthesis and Applications
- Molecular Junctions and Nanostructures
- Luminescence and Fluorescent Materials
- Structural Load-Bearing Analysis
- MXene and MAX Phase Materials
- Advanced Sensor and Energy Harvesting Materials
- Supercapacitor Materials and Fabrication
- Structural Behavior of Reinforced Concrete
- Fullerene Chemistry and Applications
- Nanocluster Synthesis and Applications
- Semiconductor materials and interfaces
- solar cell performance optimization
- Optical properties and cooling technologies in crystalline materials
- Advanced Battery Technologies Research
- GaN-based semiconductor devices and materials
- Silicon and Solar Cell Technologies
- Advanced Memory and Neural Computing
- 2D Materials and Applications
Jinan University
2016-2025
Beijing Jiaotong University
2023-2024
South China University of Technology
2004-2024
Tsinghua University
2021-2023
Zhengzhou University
2022
Foshan University
2022
Linköping University
2010-2013
Chalmers University of Technology
2010
Addis Ababa University
2010
ZTE (China)
2008
Quasi-2D perovskites have long been considered to favorable "energy funnel/cascade" structures and excellent optical properties compared with their 3D counterparts. However, most quasi-2D perovskite light-emitting diodes (PeLEDs) exhibit high external quantum efficiency (EQE) but unsatisfactory operating stability due Auger recombination induced by current density. Herein, a synergetic dual-additive strategy is adopted prepare films low defect density environmental using 18-crown-6...
High performance solar cells fabricated from an easily synthesized donor-acceptor polymer show maximum power point up to 6.0 mW cm−2, with open-circuit voltage of 0.89 V, short-circuit current density 10.5 mA cm−2 and fill factor 0.64, making this a particularly promising candidate for high-efficiency low-cost cells.
A low bandgap polymer acceptor PF5-Y5 was synthesized and its all-PSCs achieved an impressive device efficiency of 14.45% with both high <italic>V</italic><sub>oc</sub> <italic>J</italic><sub>sc</sub> due to the excellent absorption coverage, small energy loss, efficient charge separation.
Abstract Regulating molecular structure to optimize the active layer morphology is of considerable significance for improving power conversion efficiencies (PCEs) in organic solar cells (OSCs). Herein, we demonstrated a simple ternary copolymerization approach develop terpolymer donor PM6‐Tz20 by incorporating 5,5′‐dithienyl‐2,2′‐bithiazole (DTBTz, 20 mol%) unit into backbone PM6 (PM6‐Tz00). This method can effectively tailor orientation and aggregation polymer, then corresponding physical...
Pure-red perovskite LEDs (PeLEDs) based on CsPb(Br/I)3 nanocrystals (NCs) usually suffer from a compromise in emission efficiency and spectral stability account of the surface halide vacancies-induced nonradiative recombination loss, phase segregation, self-doping effect. Herein, "halide-equivalent" anion benzenesulfonate (BS- ) is introduced into NCs as multifunctional additive to simultaneously address above challenging issues. Joint experiment-theory characterizations reveal that BS- can...
Achieving high-performance perovskite light-emitting diodes (PeLEDs) with pure-red electroluminescence for practical applications remains a critical challenge because of the problematic luminescence property and spectral instability existing emitters. Herein, high-efficiency Rec. 2020 PeLEDs, simultaneously exhibiting exceptional brightness stability, based on CsPb(Br/I)3 nanocrystals (NCs) capping aromatic amino acid ligands featuring cation-π interactions, are reported. It is proven that...
Abstract The morphological features of the active layer has always been an important factor limiting efficiency organic solar cells (OSCs). Although halogen‐based additives capable forming non‐covalent bonds with molecules can effectively adjust morphology layer, inner mechanism positional isomerization on crystallization kinetics bulk heterojunction ignored, which hinders further development this technique. Herein, a new additive‐assisted optimization strategy for high‐efficiency OSCs based...
Despite the rapid advances of red and green perovskite light-emitting diodes (PeLEDs), achieving high brightness with external quantum efficiency (EQE) remains a challenge for pure-blue PeLEDs, which greatly hinders their practical applications, such as white-light illumination in optical communication high-speed low-loss light source. Herein, we report high-performance PeLED based on mixed-halide quasi-2D perovskites incorporated zwitterionic molecule 3-(benzyldimethylammonio)...
A series of aminoalkyl-substituted polyfluorene copolymers with benzothiadiazole (BTDZ) different content were synthesized by Suzuki coupling reaction, and their quaternized ammonium polyelectrolyte derivatives obtained through a postpolymerization treatment on the terminal amino groups. Copolymers are soluble in environmentally friendlier solvents, such as alcohols. It was found that efficient energy transfer occurs exciton trapping narrow band gap BTDZ site under UV illumination. Only 1%...
A non-conjugated polymer acceptor PF1-TS4 was firstly synthesized by embedding a thioalkyl segment in the mainchain, which shows excellent photophysical properties on par with fully conjugated polymer, low optical band gap of 1.58 eV and high absorption coefficient >105 cm-1 , LUMO level -3.89 eV, suitable crystallinity. Matched donor PM6, PF1-TS4-based all-PSC achieved power conversion efficiency (PCE) 8.63 %, is ≈45 % higher than that device based small molecule counterpart IDIC16....
Three polymers bearing a common carbazole−thiophene−quinoxaline−thiophene backbone, but different side chains, were designed and synthesized in order to investigate the effect of chains on their photovoltaic performance. Their photophysical, electrochemical, properties investigated compared. The polymer EWC3, with largest amount showed highest power conversion efficiency 3.7% an open-circuit voltage (Voc) 0.92 V. atomic force microscopy images active layers devices that morphology was highly...
Abstract The current work reports a high power conversion efficiency (PCE) of 9.54% achieved with nonfullerene organic solar cells (OSCs) based on PTB7‐Th donor and 3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐ d :2′,3′‐ ′]‐ s ‐indaceno[1,2‐ b :5,6‐ ′]dithiophene) (ITIC) acceptor fabricated by doctor‐blade printing, which has the highest ever reported in printed OSCs. Furthermore, PCE 7.6% is realized flexible large‐area (2.03 cm 2 )...
Despite rapid developments of light-emitting diodes (LEDs) based on emerging perovskite nanocrystals (PeNCs), it remains challenging to achieve devices with integrated high efficiencies and brightness because the insulating long-chain ligands used for PeNCs. Herein, we develop highly luminescent stable formamidinium lead bromide PeNCs capped rationally designed short aromatic 2-naphthalenesulfonic acid (NSA) LEDs. Compared commonly oleic ligands, NSA molecules not only preserve surface...
MXene based all-solution processed semitransparent flexible photovoltaic supercapacitor was fabricated by integrating the organic with as electrode and transparent supercapacitors in vertical direction.
CsPbI3 perovskite nanocrystals (NCs) have recently emerged as promising materials for optoelectronic devices because of their superior properties. However, the poor stability NCs induced by easy ligand desorption represents a key issue limiting practical applications. Herein, we report stable and highly luminescent black-phase passivated novel ligands sodium dodecyl sulfate (SDS). Theoretical calculation results reveal stronger adsorption energy SDS molecules at surface than that commonly...
Perovskite light-emitting diodes (PeLEDs) have recently shown significant progress with external quantum efficiencies (EQEs) exceeding 20%. However, PeLEDs pure-red (620-660 nm) light emission, an essential part for full-color displays, remain a great challenge. Herein, general approach of spacer cation alloying is employed in Ruddlesden-Popper perovskites (RPPs) efficient red precisely tunable wavelengths. By simply tuning the ratio dual cations, thickness distribution wells RPP films can...
All-polymer solar cells (all-PSCs) possess attractive merits including superior thermal stability and mechanical flexibility for large-area roll-to-roll processing. Introducing flexible conjugation-break spacers (FCBSs) into backbones of polymer donor (PD) or acceptor (PA) has been demonstrated as an efficient approach to enhance both the photovoltaic (PV) properties all-PSCs. However, length dependency FCBS on certain all-PSC related not systematically explored. In this regard, we report a...
Mixed-halide CsPb(Br/I)3 perovskite quantum dots (QDs) are regarded as one of the most promising candidates for pure-red light-emitting diodes (PeLEDs) due to their precise spectral tuning property. However, lead-rich surface these QDs usually results in halide ion migration and nonradiative recombination loss, which remains a great challenge high-performance PeLEDs. To solve above issues, we employ chelating agent 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid hydrate (DOTA)...
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication the EditorNEXTADDITION / CORRECTIONThis article has been corrected. View notice.Monodisperse Six-Armed Triazatruxenes: Microwave-Enhanced Synthesis and Highly Efficient Pure-Deep-Blue ElectroluminescenceWen-Yong Lai, Rui Zhu, Qu-Li Fan, Lin-Tao Hou, Yong Cao, Wei HuangView Author Information Institute of Advanced Materials (IAM), Fudan University, Shanghai 200433, P. R. China, Polymer Optoelectronic Devices, South China...
Typically a donor–acceptor (D–A) design strategy is used for engineering the bandgap of polymers solar cells. However, in this work, series alternating D–A1–D–A2 copolymers PnTQTI(F) were synthesized and characterized with oligothiophenes (nT, n = 1, 2, 3) as donor two electron-deficient moieties, quinoxaline isoindigo, acceptors repeating unit. We have studied influence segments different numbers thiophene units effect addition fluorine to unit polymers. The photophysical, electrochemical,...
Abstract The side‐chain architecture of alternating copolymers based on thiophene and quinoxaline (TQ) is found to strongly influence the solubility photovoltaic performance. In particular, TQ polymers with different linear or branched alkyloxy‐phenyl side chains unit are compared. Attaching alkyloxy segment at meta ‐ instead para ‐position phenyl ring reduces planarity backbone as well ability order. However, delocalisation across not affected, which permits design high‐performance that do...
The nitration of 4,7-dibromo-2,1,3-benzothiadiazole was modified by using CF(3)SO(3)H and HNO(3) as the nitrating agent, related yield improved greatly. On basis this improvement, two new small band gap polymers, P1TPQ P3TPQ, were developed. Bulk heterojunction solar cells based on P3TPQ [6,6]-phenyl-C(71)-butyric acid methyl ester exhibit interesting results with a power conversion efficiency 2.1% photoresponse up to 1.1 μm.
Abstract Quasi‐2D perovskites show great promise for light‐emitting diodes owing to suppressed non‐radiative losses enabled by the energy funneling/cascading nanostructures. However, red emission quasi‐2D perovskites, these ideal landscapes efficient perovskite (PeLEDs) can rarely be achieved due detrimental aggregation of low‐dimensional ligands in precursors, leading poor device efficiency and stability. Here, a ligand‐modulated dimensionality control strategy is explored achieve uniform...