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oe1(光电查) - 科学论文

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  • Over 16.7% efficiency of ternary organic photovoltaics by employing extra PC71BM as morphology regulator

    摘要： Ternary organic photovoltaics (OPVs) are fabricated with PBDB-T-2Cl:Y6 (1:1.2, wt/wt) as the host system and extra PC71BM as the third component. The PBDB-T-2Cl:Y6 based binary OPVs exhibit a power conversion efficiency (PCE) of 15.49% with a short circuit current (JSC) of 24.98 mA cm?2, an open circuit voltage (VOC) of 0.868 V and a fill factor (FF) of 71.42%. A 16.71% PCE is obtained in the optimized ternary OPVs with PBDB-T-2Cl:Y6:PC71BM (1:1.2:0.2, wt/wt) active layer, resulting from the synchronously improved JSC of 25.44 mA cm?2, FF of 75.66% and the constant VOC of 0.868 V. The incorporated PC71BM may prefer to mix with Y6 to finely adjust phase separation, domain size and molecular arrangement in ternary active layers, which can be confirmed from the characterization on morphology, 2D grazing incidence small and wide-angle X-ray scattering, as well as Raman mapping. In addition, PC71BM may prefer to mix with Y6 to form efficient electron transport channels, which should be conducive to charge transport and collection in the optimized ternary OPVs. This work provides more insight into the underlying reasons of the third component on performance improvement of ternary OPVs, indicating ternary strategy should be an efficient method to optimize active layers for synchronously improving photon harvesting, exciton dissociation and charge transport, while keeping the simple cell fabrication technology.

    关键词： ternary strategy,organic photovoltaics,morphology regulator,organic solar cells,power conversion efficiency

    更新于2025-09-12 10:27:22

  • Modulated Photocurrent Spectroscopy for Determination of Electron and Hole Mobilities in Working Organic Solar Cells

    摘要： carrier drift mobility is an important physical constant in the charge transport process of organic solar cells (OSCs). Although time-of-flight and space-charge-limited current techniques have been frequently utilized for mobility measurements, the validity of a new method using modulation photocurrent spectroscopy is discussed in this contribution. The advantages of this method are its applicability to working OSCs with optimized device structures and the simultaneous determination of the electron and hole mobilities. These features make it possible to study the relation between the mobility balance and the solar cell characteristics, such as the power conversion efficiency, using only a single working OSC; hence, it is not necessary to fabricate electron-only and hole-only devices for mobility measurements. After carrying out numerical simulations to examine the validity of this method for mobility determination, the dependence of the mobility balance on the mixing ratio of the electron-donor and –acceptor materials is presented.

    关键词： organic solar cells,carrier drift mobility,modulation photocurrent spectroscopy,power conversion efficiency,electron and hole mobilities

    更新于2025-09-12 10:27:22

  • Induced charge transfer bridge by non-fullerene surface treatment for high-performance perovskite solar cells

    摘要： A facile strategy was developed to simultaneously improve the performance and stability of perovskite solar cells (PSCs). It involves the dissolution of an ultranarrow bandgap material, (2,20-((2Z,20Z)-(((4,4,9,9-tetrakis (4-hexylphenyl)-4,9-dihydro-s-indaceno [1,2-b:5,6-b0] dithiophene-2,7-diyl) bis (4-((2-ethylhexyl) oxy) thiophene-5,2-diyl))bis(methanylylidene))bis(5,6-di?uoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene)) dimalononitrile (IEICO-4F)), in chlorobenzene (antisolvent), the use of the solution in the treatment of perovskite ?lms during spin-coating, and the fabrication of solar cells using the treated perovskite ?lms. IEICO-4F formed a charge transfer bridge at the perovskite/Spiro-OMeTAD interface and improved the charge extraction and transport. Furthermore, the addition of IEICO-4F facilitated the crystallization, improved the surface morphology, and enhanced the passivation of trap sites of perovskite ?lms. Meanwhile, a reliable power conversion ef?ciency exceeding 20% for CH3NH3PbI3-based cells and 15.72% for CsPbBrI2-based all-inorganic PSCs was realized. These values surpass those of the control devices (i.e., 18.66% and 13.30%, respectively).

    关键词： perovskite solar cells,IEICO-4F,antisolvent treatment,power conversion efficiency,charge transfer bridge

    更新于2025-09-12 10:27:22

  • Bromination of the Small-Molecule Acceptor with Fixed Position for High-Performance Solar Cells

    摘要： Brominated A?D?A-type small-molecule acceptor ITIC-2Br-γ with certain molecular structure was designed and synthesized. Compared to the mixture of three isomers (ITIC-2Br-m), ITIC-2Br-γ shows stronger absorption in the region of 600?800 nm, which is beneficial to afford higher JSC. Furthermore, single-crystal structure analysis of ITIC-2Br-γ indicates that although the bromine atom has a larger size, the end groups of adjacent molecules still exhibit strong interactions with short π?π distance of 3.28 ?. Because of the Br···S and O···S interactions, all molecules form an interpenetrated three-dimensional network, which is beneficial for the charge to transport along multidirections. The organic solar cells (OSCs) based on the PBDB-T-2F:ITIC-2Br-γ blend film exhibit a higher power conversion efficiency (PCE) of 12.05% due to its better film morphology and higher charge mobilities, whereas a PBDB-T-2F:ITIC-2Br-m-based device only shows a moderate PCE of 10.88%. These results indicate that separation and purification of the brominated A?D?A-type small molecules are an effective way to further improve their photovoltaic performances. Furthermore, bromination is easily synthesized and is of low-cost, which exhibits great potential for the preparation of large-scale OSCs.

    关键词： Brominated A?D?A-type small-molecule acceptor,ITIC-2Br-γ,organic solar cells,power conversion efficiency,charge transport

    更新于2025-09-12 10:27:22

  • [IEEE 2019 1st International Conference on Advances in Science, Engineering and Robotics Technology (ICASERT) - Dhaka, Bangladesh (2019.5.3-2019.5.5)] 2019 1st International Conference on Advances in Science, Engineering and Robotics Technology (ICASERT) - Design and Optimization of AlGaAs/InP Multi-junction Solar Cell

    摘要： A structure for AlxGa1-xAs/InP multi-junction solar cell is proposed by using numerical simulation and the simulation is done with the help of Analysis of Microelectronic and Photonic Structures (AMPS-1D) simulator. The thickness of p-layer of AlxGa1-xAs top cell is varied from 20 nm to 150 nm keeping the n-layer thickness at a constant value of 800 nm. The thickness of n-layer of InP bottom cell is varied from 100 nm to 7000 nm and p-layer thickness is fixed at 200 nm. The band gap of AlxGa1-xAs top cell absorber layer is varied from 1.42 eV to 1.79 eV. The highest power conversion efficiency (PCE) obtained is 35.643% (Voc=2.385 V, Jsc = 15.789 mA/cm2, FF = 0.88). The operating temperature is also varied from 0 °C to 70 °C. We observed that with the increase in operating temperature, the normalized open circuit voltage decreased almost linearly which shows better stability of this proposed multi-junction solar cell.

    关键词： AlGaAs/InP,AMPS-1D simulation,thermal stability,power conversion efficiency (PCE),fill factor (FF)

    更新于2025-09-12 10:27:22

  • What limits the efficiency of GaN-based superluminescent light-emitting diodes (SLEDs)?

    摘要： Gallium-nitride-based SLEDs are attractive light sources for augmented reality displays and other applications. However, the electrical-to-optical power conversion efficiency (PCE) of SLEDs is still far below the record-high values reported for LEDs. Utilizing advanced numerical device simulation, this paper investigates the internal physical pro- cesses that cause the low PCE of SLEDs. The poor hole conductivity strongly reduces the electrical efficiency, similar to laser diodes. However, in contrast to laser diodes, the rising carrier density in the active layers is identified as main reason for enhanced Auger recom- bination that severely limits the internal quantum efficiency. Design improvement options are demonstrated.

    关键词： Superluminescent light-emitting diode,Auger recombination,InGaN/GaN,Laser diode,Self-heating,Power conversion efficiency,SLED,Hole conductivity

    更新于2025-09-12 10:27:22

  • Introducing fluorene into organic hole transport materials to improve mobility and photovoltage for perovskite solar cells

    摘要： A new small molecular hole-transporting material, 1,3,6,8-tetrakis-[N-(p-methoxyphenyl)-N0-(9,90-dimethyl-9H-fluoren-2-yl)-amino]-pyrene (TFAP) was synthesized and applied in CH3NH3PbI3-perovskite solar cells. A best power conversion efficiency of 19.7% with a photovoltage of 1.11 V has been achieved.

    关键词： photovoltage,hole-transporting material,perovskite solar cells,fluorene,power conversion efficiency

    更新于2025-09-12 10:27:22

  • Covalently linked donor–acceptor dyad for efficient single material organic solar cells

    摘要： A novel covalently linked donor–acceptor dyad comprising a dithienopyrrol-based oligomeric donor and a fullerene acceptor was synthesized and characterized. The concomitant effect of favorable optoelectronic properties, energy levels of the frontier orbitals, and ambipolar charge transport enabled the application of the dyad in simplified solution-processed single material organic solar cells reaching a power conversion efficiency of 3.4%.

    关键词： donor–acceptor dyad,organic solar cells,ambipolar charge transport,solution-processed,power conversion efficiency

    更新于2025-09-12 10:27:22

  • Efficient and Mechanically Robust Ultraflexible Organic Solar Cells Based on Mixed Acceptors

    摘要： A simple strategy to simultaneously improve power conversion efficiency (PCE) and mechanical stability of ultra?exible organic solar cells is reported. By using a fullerene/non-fullerene mixed acceptor, 3-mm-thick ultra?exible organic solar cells achieve a PCE of 13% (a certi?ed value of 12.3%) with 97% PCE retention after 1,000 bending cycles and 89% PCE retention after 1,000 compression-stretching cycles.

    关键词： mixed acceptors,fullerene,mechanical stability,non-fullerene,ultra?exible organic solar cells,power conversion efficiency

    更新于2025-09-12 10:27:22

  • Enhancement in photovoltaic properties of bismuth ferrite/zinc oxide heterostructure solar cell device with graphene/indium tin oxide hybrid electrodes

    摘要： Integrating of ferroelectric thin films with two-dimensional materials may provide a novel and unique characteristics in the field of optoelectronics due to the coupling of their distinctive intrinsic features. A heterostructure (bismuth ferrite/zinc oxide) device is fabricated with different types of the electrode to enhance the power conversion efficiency (PCE). A single-phase multiferroic BFO thin film is grown by atomic layer deposition (ALD) method and annealed in different environments such as helium, nitrogen, and oxygen. We investigated the effect of annealing parameters and different types of electrodes on solar cell applications. We observed that the leakage current 10 orders of magnitude was reduced by decreasing in the dielectric loss. Further, the power conversion efficiency (PCE) is improved from 4.1% to 7.4% with a hybrid transparent electrode (graphene/indium tin oxide). The value of PCE is further increased at a low temperature. So, the improvement in the key parameter of bismuth ferrite thin-film evidently highlights the importance of annealing atmosphere and graphene as an electrode in BFO thin film applications in optoelectronics.

    关键词： Power conversion efficiency,Transparent electrode,Annealing atmosphere,Atomic layer deposition,Graphene,Leakage current

    更新于2025-09-12 10:27:22