修车大队一品楼qm论坛51一品茶楼论坛,栖凤楼品茶全国楼凤app软件 ,栖凤阁全国论坛入口,广州百花丛bhc论坛杭州百花坊妃子阁

oe1(光电查) - 科学论文

260 条数据
?? 中文（中国） ▾

  • Regulation of Molecular Packing and Blend Morphology by Finely Tuning Molecular Conformation for High-Performance Nonfullerene Polymer Solar Cells

    摘要： The asymmetric thienobenzodithiophene (TBD) structure is first systematically compared with the benzo[1,2-b:4,5-b′]dithiophene (BDT) and dithieno[2,3-d:2′,3′-d′]benzo[1,2-b:4,5-b′]dithiophene (DTBDT) units in donor-acceptor (D-A) copolymers and applied as the central core in small molecule acceptors (SMAs). Specific polymers including PBDT-BZ, PTBD-BZ, and PDTBDT-BZ with different macromolecular conformations are synthesized and then matched with four elaborately designed acceptor-donor-acceptor (A-D-A) SMAs with structures comparable to their donor counterparts. The resulting polymer solar cell (PSC) performance trends are dramatically different from each other and highly material-dependent, and the active layer morphology is largely governed by the polymer conformation. Due to its more linear backbone, the PTBD-BZ film has higher crystallinity and more ordered and denser π–π stacking than those of the PBDT-BZ and PDTBDT-BZ films. Thus, PTBD-BZ shows excellent compatibility with and strong independence on the SMAs with varied structures, and PTBD-BZ-based cells deliver high power conversion efficiency (PCE) of 10~12.5%, whereas low PCE is obtained by cells based on PDTBDT-BZ due to its zigzag conformation. Overall, this study reveals control of molecular conformation as a useful approach to modulate the photovoltaic (PV) properties of conjugated polymers.

    关键词： morphology,nonfullerene solar cell,power conversion efficiency,asymmetrical backbone,molecular conformation

    更新于2025-09-12 10:27:22

  • Toward Scalable PbS Quantum Dot Solar Cells Using a Tailored Polymeric Hole Conductor

    摘要： Colloidal quantum dot (CQD) solar cells processed from pre-exchanged lead sulfide (PbS) inks have received great attention in the development of scalable and stable photovoltaic devices. However, the current hole-transporting material (HTM) 1,2-ethanedithiol-treated PbS (PbS-EDT) CQDs have several drawbacks in terms of commercialization, including the need for oxidation and multilayer fabrication. Conjugated polymers are an alternative HTM with adjustable properties. Here we propose a series of conjugated polymers (PBDB-T, PBDB-T(Si), PBDB-T(S), PBDB-T(F)) for PbS CQD solar cells as HTMs. Through polymer side-chain engineering, we optimize the model polymer PBDB-T to tune the energy levels, increase hole mobility, improve solid-state ordering, and increase free carrier density. CQD solar cells based on modified polymer PBDB-T(F) exhibit a best power conversion efficiency (PCE) of 11.2%, which outperforms the devices based on conventional PbS-EDT HTM (10.6%) and is currently the highest PCE for PbS solar cells based on organic HTMs.

    关键词： conjugated polymers,PbS,hole-transporting material,Colloidal quantum dot,power conversion efficiency,solar cells

    更新于2025-09-12 10:27:22

  • The effect of TiCl <sub/>4</sub> treatment on the performance of dye-sensitized solar cells

    摘要： Titanium dioxide (TiO2) is used to form the anode in dye sensitized solar cells (DSSCs) and is thus one of the crucial components of this type of solar cell. A large range of treatments of the titania anode before deposition of the dye have been applied to improve the performance of DSSCs among which the TiCl4 treatment is the most frequently used treatment. The present study investigates how the TiCl4 treatment of the TiO2 changes the anode. For this purpose, different sample sets, nontreated, post-treated, and pre-post treated cells, were fabricated and analyzed with electron and ion scattering spectroscopy to investigate how they change the titania surface and consequently influence the cell performance. After the TiCl4 treatment, the short circuit current density (Jsc), open-circuit voltage (Voc), and efficiency significantly improved. An upward shift in the conduction band of the semiconductor as an effect of TiCl4 treatment was measured using inverse photoemission spectroscopy and UV-photoelectron spectroscopy. An increase in dye adsorption due to the treatment was found through neutral impact collision ion scattering spectroscopy measurement. The change in the energy level alignment of the titania and the adsorbed dye and the increase in dye loading explain the threefold increase of power conversion of the cells.

    关键词： TiO2,dye-sensitized solar cells,electron and ion scattering spectroscopy,power conversion efficiency,TiCl4 treatment

    更新于2025-09-12 10:27:22

  • Neutral-Colored Transparent Crystalline Silicon Photovoltaics

    摘要： We report a neutral-colored transparent c-Si substrate using a 200-mm-thick c-Si wafer, which is known to be opaque. The transparent c-Si substrate shows a completely neutral color, similar to glass without a transmission cut-on wavelength. In addition, the transmittance of the transparent c-Si substrate is systematically tuned under the full solar spectrum. As a representative application, the transparent solar cells fabricated with the substrate developed in this study show a power conversion efficiency of up to 12.2%.

    关键词： transparent,neutral-colored,photovoltaics,power conversion efficiency,crystalline silicon

    更新于2025-09-12 10:27:22

  • CuSCN as Hole Transport Material with 3D/2D Perovskite Solar Cells

    摘要： We report stable perovskite solar cells having 3D/2D perovskite absorber layers and CuSCN as an inorganic hole transporting material (HTM). Phenylethylammonium (PEA) and 4-fluoro-phenylethylammonium (FPEA) have been chosen as 2D cations, creating thin layers of (PEA)2PbI4 or (FPEA)2PbI4 on top of the 3D perovskite. The 2D perovskite as an interfacial layer, neutralizes defects at the surface of the 3D perovskite absorber and can protect from moisture-induced degradations. We demonstrate excellent charge extraction through the modified interfaces into the inorganic CuSCN HTM, with device efficiencies of above 18%, compared to 19.3% with conventional spiro-OMeTAD. Furthermore, we show significantly enhanced ambient stability.

    关键词： Phenylethylammonium (PEA),CuSCN,hole transporting material (HTM),power conversion efficiencies (PCE),4-fluoro-phenylethylammonium (FPEA),perovskite based solar cells (PSCs)

    更新于2025-09-12 10:27:22

  • A high-performance non-fullerene electron acceptor with bisalkylthiothiophene π-bridges for organic photovoltaics

    摘要： A new non-fullerene small molecule acceptor IDT2ST-4F bearing a bisalkylthiothiophene unit as the p-bridge was designed and synthesized, which exhibited a low optical bandgap of 1.43 eV. The optimized organic solar cells based on PBDB-T:IDT2ST-4F gave a high power conversion efficiency (PCE) of 11.43% with a relatively low energy loss of 0.58 eV.

    关键词： non-fullerene electron acceptor,power conversion efficiency,organic photovoltaics,bisalkylthiothiophene

    更新于2025-09-12 10:27:22

  • Photovoltaic effect in bulk heterojunction system with glass forming indandione derivative DMABI-6Ph

    摘要： The aim of the work is to evaluate possible use of 2-[[4-(bis(2-trityloxyethyl)amino)phenyl]methylene]indane-1,3-dione (DMABI-6Ph) as light absorbing material for solar cells. DMABI-6Ph is a perspective material due to its good photoelectrical, thermal and chemical properties. The main advantage of DMABI-6Ph is its ability to form amorphous films by wet-casting methods thus allowing using the compound in organic solar cells made from solution. For now most popular materials for solution processable solar cells are polymer P3HT and fullerene derivative PCBM, but lot of investigations are in the field of new low molecular weight materials to replace the polymer. Photoelectrical measurements were made to determine molecule ionization and electron affinity levels of DMABI-6Ph. Difference of 2.06 eV between DMABI-6Ph ionization level and PCBM affinity level was obtained. Accordingly open circuit voltage of system DMABI-6Ph:PCBM was measured up to 0.78 V. The best power conversation efficiency was 0.11 % for the DMABI-6Ph:PCBM mass fraction 2:1. Limiting factor for high efficiency could be low charge carrier mobility which can be increase by additional DMABI-6Ph modification.

    关键词： energy levels,glass forming structure,bulk heterojunction,indandione group,power conversion efficiency

    更新于2025-09-12 10:27:22

  • Efficient and stable tin-based perovskite solar cells by introducing π-conjugated Lewis base

    摘要： Tin-based perovskite solar cells (TPSCs) as the most promising candidate for lead-free PSCs have incurred extensive researches all over the world. However, the crystallization process of tin-based perovskite is too fast during the solution-deposited process, resulting in abundant pinholes and poor homogeneity that cause serious charge recombination in perovskite layer. Here, we employed the π-conjugated Lewis base molecules with high electron density to systematically control the crystallization rate of FASnI3 perovskite by forming stable intermediate phase with the Sn-I frameworks, leading to a compact and uniform perovskite film with large increase in the carrier lifetime. Meanwhile, the introduction of the π-conjugated systems also retards the permeation of moisture into perovskite crystal, which significantly suppresses the film degradation in air. These benefits contributed to a stabilizing power conversion efficiency (PCE) of 10.1% for the TPSCs and maintained over 90% of its initial PCE after 1000-h light soaking in air. Also, a steady-state efficiency of 9.2% was certified at the accredited test center.

    关键词： FASnI3 perovskite,π-conjugated Lewis base,perovskite solar cells,power conversion efficiency,crystallization rate

    更新于2025-09-12 10:27:22

  • Enhancement of the Power Conversion Efficiency of Organic Solar Cells by Surface Patterning of Azobenzene Thin Films

    摘要： Nanoscale-patterned azobenzene thin films were incorporated in organic solar cells to scatter incident light, thus increasing the optical path length of photons inside the active area. This ultimately led to significant power conversion efficiency (PCE) enhancements in the active layer. Specifically, the azobenzene thin films were patterned with two-dimensional crossed surface relief gratings inscribed via laser interference lithography. The patterned films were then bleached and thermally stabilized by exposure to strong ultraviolet light before being incorporated in P3HT:PC61BM and PTB7:PC61BM solar cells. The fabricated solar cells exhibited a PCE enhancement of 133%, from 1.37 to 3.19%, for P3HT:PC61BM solar cells, and a PCE enhancement of 302%, from 0.53 to 2.13%, for PTB7:PC61BM solar cells.

    关键词： azobenzene thin films,laser interference lithography,organic solar cells,power conversion efficiency,surface relief gratings

    更新于2025-09-12 10:27:22

  • Perovskite Solar Cell: Research Direction for Next 10 Years

    摘要： Since the first report on a solid-state perovskite solar cell (PSCs) with a power conversion efficiency (PCE) of 9.7% under 1 sun illumination and 500 h stability at ambient conditions obtained from an unencapsulated device in 2012, PSCs have received tremendous attention from scientists and engineers working on not only materials and devices but also fundamentals. The realization of solid-state PSCs was possible due to the fact that methylammonium lead triiodide (MAPbI3) was extremely unstable in dye-sensitized solar cell structures containing polar liquid redox electrolyte. The first version of a PSC was based on a nanocrystalline perovskite with dot morphology sitting on the TiO2 surface, which evolved to a thin film layout looking similar to the conventional p?i?n junction. This initial progress of device structure enhanced PCE to about 12%, which was followed by a further increase in photovoltaic performance by exploring coating methods for high-quality perovskite films. To date, the record PCE of 25.2% was certified by Newport, a proxy for National Renewable Energy Lab (NREL) using quasi-steady-state measurement, which was posted in the best research-cell efficiency chart provided by NREL. PSCs now outperform the completions based on CIGS (PCE = 23.4%), CdTe (PCE = 22.1%), and even multicrystalline Si (PCE = 22.8%).

    关键词： Perovskite solar cells,Tandem technology,Power conversion efficiency,Recycling technology,Large-area coating,Stability

    更新于2025-09-12 10:27:22