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Blade-coated efficient and stable large-area organic solar cells with optimized additive
摘要： For the fabrication of large-area devices, achieving both excellent photovoltaic performance and device stability simultaneously is the key to commercialization of organic solar cells (OSCs). Herein, non-fullerene OSCs with various additives (1,8-diiodooctane (DIO), 1,8-octanedithiol (ODT), chloronaphthalene (CN)) were fabricated by blade-coating in ambient environment. It was demonstrated that all these three additives can improve device performance. However, CN based device shows only a slightly increased power conversion efficiency (PCE) of 9.34% as compared to the device without additive (PCE=9.19%). Although DIO based device presents an increased PCE of 9.87%, the corresponding device stability is poor. Impressively, due to the enhanced crystallization as well as the small and pure domains, the device with ODT additive not only possesses higher photovoltaic performance (PCE of 10.20%), but also exhibits better device stability. In addition, ODT based large-area device (90 mm2) prepared by blade-coating also exhibits a high PCE of 8.59%, showing great potential in fabricating efficient and stable large-area organic solar cells.
关键词： Stability,Organic solar cells,Large-area,Blade-coating,Additive
更新于2025-09-23 15:19:57
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Higha??Performance Pseudoplanar Heterojunction Ternary Organic Solar Cells with Nonfullerene Alloyed Acceptor
摘要： The vast majority of ternary organic solar cells are obtained by simply fabricating bulk heterojunction (BHJ) active layers. Due to the inappropriate distribution of donors and acceptors in the vertical direction, a new method by fabricating pseudoplanar heterojunction (PPHJ) ternary organic solar cells is proposed to better modulate the morphology of active layer. The pseudoplanar heterojunction ternary organic solar cells (P-ternary) are fabricated by a sequential solution treatment technique, in which the donor and acceptor mixture blends are sequentially spin-coated. As a consequence, a higher power conversion efficiency (PCE) of 14.2% is achieved with a Voc of 0.79 V, Jsc of 25.6 mA cm?2, and fill factor (FF) of 69.8% compared with the ternary BHJ system of 13.8%. At the same time, the alloyed acceptor is likely formed between two the acceptors through a series of in-depth explorations. This work suggests that nonfullerene alloyed acceptor may have great potential to realize effective P-ternary organic solar cells.
关键词： ternary organic solar cells,sequential spin-coating,pseudoplanar heterojunctions,nonfullerene alloyed acceptors
更新于2025-09-23 15:19:57
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High-Performance Perovskite-Based Light-Emitting Diodes from the Conversion of Amorphous Spin-Coated Lead Bromide with Phenethylamine Doping
摘要： Large-grained and well-oriented methylammonium lead tribromide (MAPbBr3) perovskite was formed from the conversion of amorphous lead bromide (PbBr2) doped with phenethylamine (PEA). The addition of PEA ions (with an optimized molar ratio of 0.008%) to the PbBr2 solution assisted the formation of a smooth PEA-doped PbBr2 layer by spin-coating. Then, the PEA-doped PbBr2 thin film would convert into large-grained and well-oriented MAPbBr3 with the help of a solid?vapor reaction under a vaporized methylammonium bromide (MABr) and choline chloride (CC) atmosphere. Furthermore, both PEA and CC would passivate the defects of perovskite to improve the crystal quality of perovskite. By applying this perovskite layer in perovskite light-emitting diodes (PeLEDs), the maximum luminance and current efficiency of PeLEDs could reach 20,869 cd/m2 and 3.99 cd/A, respectively; these values are approximately five and three times larger than those of PeLEDs without PEA. The perovskite converted from spin-coated PbBr2 with a PEA dopant remarkably improved the luminance and current efficiency of its PeLEDs.
关键词： choline chloride,methylammonium lead tribromide,perovskite,phenethylamine,lead bromide,light-emitting diodes,spin-coating
更新于2025-09-23 15:19:57
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Zwitterion-Stabilizing Scalable Bladed ?±-Phase Cs <sub/>0.1</sub> FA <sub/>0.9</sub> PbI <sub/>3</sub> Films for Efficient Inverted Planar Perovskite Solar Cells
摘要： Perovskite solar cells (PSCs) have attracted considerable attention as a prominent photovoltaic technology, yet the state-of-the-art PSCs still contain thermally unstable methylammonium (MA) cations and use laboratory-level assembly methods, making the device's stability and scalability challenging. Herein, we demonstrate a generic zwitterion-assisted strategy to improve the efficiency and stability of formamidinium (FA)-based PSCs made by scalable blade-coating technique. The zwitterion, 3-(1-pyridinio)-1-propanesulfonate (PPS), plays dual roles in effectively suppressing the formation of undesirable δ-phase and passivating the trap states of FA-based perovskite films. As a consequence, uniform FA-based perovskite films with area as large as 16 cm2 were successfully obtained and the small-area (0.1 cm2) device incorporating PPS achieved a champion efficiency up to 18.9%, as well as enabled a best efficiency of 16.2% for large-area (1 cm2) device. More importantly, unencapsulated devices with PPS also exhibited superior thermal and moisture stability, remaining at 88% of initial efficiency after aging in air for 1000 h. This methodology provides a low-cost and facile pathway to realize the synergistic effect of crystallization modulation and defect passivation for large-scale perovskite devices with excellent optoelectronic performance and stability.
关键词： formamidinium-based films,perovskite solar cell,blade-coating,stability,defect passivation
更新于2025-09-23 15:19:57
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Ag2S-Glutathione Quantum Dots for NIR Image Guided Photothermal Therapy
摘要： Aqueous synthesis of glutathione (GSH) coated Ag2S quantum dots (QD) with strong emission in the medical imaging window (700-900 nm) were prepared from AgNO3. Variations in temperature, time, pH and sulfur source (Na2S and thioacetamide) were studied to tune the emission wavelength and intensity of QDs. The optimum synthesis condition to produce the smallest QDs (ca 7 nm) with the highest quantum yield (70 %) and excellent stability was determined as 50 ℃ and pH 10 where Na2S was used in 2 h reactions. Cytotoxicity was evaluated with MTT assay on HT29 and MCF7 cancer cell lines and indicated no significant toxicity of QDs up to 200 μg/mL. Photothermal Therapy (PTT) potential was first investigated by 795 nm, continuous-wave fiber coupled diode laser using aqueous solutions of QDs and then on HT29 and MCF7 cells. QD (150 μg/mL) treated MCF7 cells almost quantitatively died after 10 min irradiation at 795 nm (700 mW, 1.82 W/cm2) and the viability of HT29 cells dropped to 40%. Most cell death was late apoptotic/necrotic. This study indicates that such laser irradiation procedure and the QDs are safe yet, their combination provides a dramatic cell death upon short laser treatment. PTT coupled with strong intracellular optical signal promotes Ag2S-GSH QDs as potential theranostic nanoparticles.
关键词： glutathione coating,NIR imaging,Ag2S quantum dots,theranostic nanoparticles,photothermal therapy
更新于2025-09-23 15:19:57
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Effects of alkali and transition metal-doped TiO <sub/>2</sub> hole blocking layers on the perovskite solar cells obtained by a two-step sequential deposition method in air and under vacuum
摘要： Planar perovskite solar cells (PPSCs) have received great attention in recent years due to their intriguing properties, which make them a good choice for photovoltaic applications. In this work, the effect of alkali and transition metal-doped TiO2 (cesium-doped TiO2 (Cs-TiO2) and yttrium-doped TiO2 (Y-TiO2)) compact layers on the optical, structural and the photovoltaic performance of the PPSCs have been investigated. The perovskite layer syntheses were carried out by depositing a lead iodide (PbI2) layer via spin-coating; converting PbI2 into methyl ammonium iodide (CH3NH3PbI3) by chemical vapor deposition (CVD) and spin-coating at 60 min and 60 s conversion times respectively. The as-deposited PPSCs were studied layer-by-layer using an X-ray diffractometer, scanning electron microscope, and UV-vis diffuse reflectance, transmittance and absorbance. The power conversion efficiency for stable processed perovskite solar cells were 3.61% and 12.89% for air and vacuum processed, respectively.
关键词： TiO2 doping,Chemical vapor deposition,Perovskite solar cells,Spin-coating,Photovoltaic performance
更新于2025-09-23 15:19:57
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Dip coated TiO2 based metal-semiconductor-metal ultraviolet photodetector for UV A monitoring
摘要： Metal-Semiconductor-Metal ultraviolet photodetector was fabricated by painting silver contacts on dip coated TiO2 thin films. The number of deposition cycles have influence on physiochemical properties and UV sensing properties. The UV photodetector properties were studied by illuminating devices with light intensity of 1.8 μW/cm2 and 5 V bias. The fabricated devices show ohmic I–V characteristics. The maximum photocurrent of 0.64 μA is obtained at 365 nm for film deposited at 8 cycles. The highest photoresponsivity obtained for C8 sample under UV illumination of 365 nm is 2.15 A/W at 5 V bias. The fast rise and fall times obtained for fabricated device are 17 s and 19 s. The optical switching characteristics show good reproducibility and stability.
关键词： Photoresponsivity,Dip coating,MSM UV photodetector,Titanium dioxide
更新于2025-09-23 15:19:57
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Wide angle antireflection in metal nanoparticles embedded in a dielectric matrix for plasmonic solar cells
摘要： The photon density in solar cells is usually optimized through tailored antireflection coatings (ARCs). We develop an analytical model to describe metal hybrid nanoparticles (NPs)-based ARC, where metal NPs are embedded in a standard ARC on a Si-substrate. A point dipole approach is implemented to calculate diffuse reflectance by NPs, while transfer matrix method is used for specular reflectance from front surface. We found that embedding metal NPs in SiN ARC enhances the antireflection property of the former at non-normal angles of incidence (AOI) of light. Electric field distribution patterns of radiation in the substrate by NPs are calculated for various AOI, which support the improvements in the antireflection property. Weighted solar power transmittances from ARCs are calculated, which show that Ag-NPs (radius = 35 nm) embedded in SiN (thickness = 70 nm) performs better than SiN for AOI over 74°, whereas Al-NPs (radius = 35 nm) embedded in SiN (thickness = 70 nm) performs better for AOI over 78°.
关键词： solar cells,plasmonics,metal nanoparticles,silicon,transfer matrix method,antireflection coating
更新于2025-09-23 15:19:57
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Single-material organic solar cells with fully conjugated electron-donor alkoxy-substituted bithiophene units and electron-acceptor benzothiadiazole moieties alternating in the main chain
摘要： Main chain conjugated linear polymers, constituted by alternating electron-donor (D) and -acceptor (A) moieties, have been prepared with the aim of testing their performances as photoactive components in single material organic solar cells (SMOSCs). The D moiety is constituted by bithiophene co-units bearing in the position 3 of the thiophene ring an hexyloxy, a hexyloxymethyl or a hexyl group, while the A moiety is represented by the benzothiadiazole group. The D–A polymers were obtained in high yield through the poorly demanding oxidative FeCl3 polymerization process - starting, respectively, from the related precursors 4,7-bis(3-hexyloxythiophen-2-yl)benzo[c][2,1,3]thiadiazole, 4,7-bis[3-(6-methoxyhexyl)thiophen-2-yl]benzo[c][2,1,3]thiadiazole and 4,7-bis(3-hexylthiophen-2-yl)benzo[c][2,1,3]thiadiazole - with low dispersity indexes, close to the monodisperse state, after fractionation with methanol. The materials have been thoroughly characterized for their physical and structural properties and then tested for photoconversion efficiency in SMOSCs by using different deposition procedures of the photoactive component. In agreement with Kelvin probe force microscopy (KPFM) measurements, the best photovoltaic performance was observed for the polymer based on conjugated 3-alkoxythiophene and benzothiadiazole moieties, achieving significant photocurrents for this type of fully conjugated alternating D–A structures (Jsc = 2.63-3.72 mA cm-2).
关键词： alternating D–A polymers,alkoxy alkyl substituents,photo-charges,Single-material organic solar cells,spray coating method
更新于2025-09-23 15:19:57
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Correlated alkyl chain length to defect passivation efficacy in perovskite solar cells
摘要： We for the first time correlated the alkyl chain length of amine molecules to the defect passivation efficacy, either on surface or at grain boundaries of perovskite films. Blade-coated perovskite solar cells with long-chain amines passivation achieved an efficiency of 21.5%, accompanied by a small voltage loss of 0.35 V.
关键词： efficiency,defect passivation,blade-coating,alkyl chain length,perovskite solar cells
更新于2025-09-23 15:19:57