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The influence of electrode for electroluminescence devices based on all-inorganic halide perovskite CsPbBr<sub>3</sub>
摘要： Electroluminescence devices based all-inorganic halide perovskite material with the excellent luminescence performance have been studied extensively in recent years. However, the important role for the electrodes of electroluminescence devices is payed few attention by theoretical and experimental studies. Appropriate electrodes can reduce the Schottky barrier height to decrease the energy loss, and prevent the metal impurities from diffusing into the perovskite material to generate deep traps levels, which improves the luminous efficiency and lifetime of devices. In this paper, not only the interface effects between CsPbBr3 and common metal electrode (Ag, Au, Ni, Cu and Pt) are studied by first-principle calculations, but also the diffusion effects of metal electrode atom into the CsPbBr3 layer are also explored by nudged elastic band calculations. The calculated results show the metal Ag is more suitable for the cathode for CsPbBr3 electroluminescence devices, while the metal Pt is more applicable for the anode. Based on the overall consideration about the interface effects and diffusion effects of the CsPbBr3-metal electrode junctions, the essential principle provide a valuable reference how to select the suitable electrodes for other electroluminescence devices.
关键词： electroluminescence devices,diffusion effects,Schottky barrier height,CsPbBr3,all-inorganic halide perovskite,metal electrodes
更新于2025-09-23 15:19:57
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Effect of Metal Electrodes on Aging-Induced Performance Recovery in Perovskite Solar Cells
摘要： For commercialization of perovskite solar cells, it is important to substitute the alternative electrode for Au to decrease the unit cost. From the early stage, Ag exhibits a potential to be a good counter electrode in perovskite solar cells, however there is an abnormal s-shaped J-V curve with Ag electrode, and it is recovered as time passed. The perception of the aging-induced recovery process and refutation for raised stability issues are required to commercial application of Ag electrodes. Herein, we compared the aging effect of perovskite solar cells with Ag and Au electrodes and found that only devices with Ag electrodes have dramatical aging-induced recovery process. We observed the change of photo-electronic properties only in the devices with Ag electrodes as time passes which mainly contribute to recovery of s-shaped J-V curve. We verified the work function change of aged Ag electrode and its mechanism by photoelectron spectroscopy analysis. By comparing the light stability under 1-sun intensity illumination we can assure the practical stability of Ag electrodes in case of being encapsulated. This work suggests the profound understanding of aging-induced recovery process of perovskite solar cells, and the possibility of commercial application of Ag electrodes.
关键词： Perovskite solar cells,Hole injection,Interfacial reaction,Metal electrodes,Work function
更新于2025-09-11 14:15:04
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Flexible devices fabricated by plate-to-roll nanoimprint lithography system
摘要： Plate-to-roll nanoimprint lithography (P2RNIL) system has been developed to realize high speed, large scale and high resolution nanoimprint process. Imprinted patterns with line width less than 75nm at a speed of 22cm2/s on flexible substrate has been achieved. To improve the quality of the patterns imprinted on, we proposed a compliant mechanism which can realize passive alignment and minimize the lateral displacement between the template and substrate. Finite element analysis of this compliant mechanism was carried out. By using the P2RNIL system, wire-grid polarizers(up to 10030:1 extinction ratio and up to 88% transmittance) and transparent metal electrodes whose performance is in good accordance with simulated results were successfully fabricated.
关键词： transparent metal electrodes,nanoimprint,wire-grid polarizers
更新于2025-09-09 09:28:46