- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Unraveling the roles of mesoporous TiO2 framework in CH3NH3PbI3 perovskite solar cells; ????-?TiO2????????¨CH3NH3PbI3é??é??????¤aé?3è????μ?±???-????????¨;
摘要： Both of planar and mesoporous architectures prevail for perovskite solar cells (PSCs). However, it is still an open question how the architecture affects the performance of PSCs. The inconsistent results in the references often create confusion. In particular, the specific roles of mesoporous frameworks are yet to be well elaborated and require further clarification. In this study, we carefully compared the properties of perovskite films and the device performances for both architectures to unravel the roles of mesoporous TiO2 frameworks in CH3NH3PbI3 PSCs. The detailed characterizations of structural, microscopic, optical and electrical properties revealed that the presence of mesoporous TiO2 framework contributed to enlarged perovskite crystal sizes, enhanced light harvesting, efficient electron extration and suppressed charge recombination. As a result, compared with the planar device, the mesoporous device yielded an improved power conversion efficiency of 18.18%, coupled with a reduced hystersis. This study reveals the benefits of mesoporous TiO2 framework in PSCs and provides the guidance for the design and optimization of architectures for high-performance devices.
关键词： device architecture,electron transporting layer,electron extraction,CH3NH3PbI3,perovskite solar cells
更新于2025-09-23 15:21:01
-
Highly Efficient Quantum Dot Light‐Emitting Diodes by Inserting Multiple Poly(methyl methacrylate) as Electron‐Blocking Layers
摘要： This work presents a new device architecture integrating multiple poly(methyl methacrylate) (PMMA) electron-blocking layers (EBL) in quantum dot light-emitting diodes (QD-LEDs). The device utilizes red-emitting CdSe/ZnS QD with a novel structure where multiple PMMA EBLs are sandwiched between a pair of QD layers. A systematic optimization of QD-LED structures has shown that a device including two PMMA and three QD layers performs the best, achieving a current efficiency of 17.8 cd A?1 and a luminance of 194 038 cd m?2. Numerical simulation of a simplified model of the proposed QD-LED structure verifies that the structure consisting of two PMMA and three QD layers provides significant improvement in electroluminescent intensity. The simulation provides further insight into the origin of the effect of the PMMA EBL by showing that the addition of PMMA EBL reduces the electron leakage from the active QD region and enhances electron confinement, leading to an increased electron concentration in the QD active layers and a higher radiative recombination rate. The experimental and theoretical studies presented in this work demonstrate that multiple layers of PMMA can act as efficient EBLs in the fabrication of QD-LEDs of improved performance.
关键词： simulation,device architecture,electron-blocking layer,electron leakage,poly(methyl methacrylate) (PMMA),quantum dot light-emitting diodes (QD-LED)
更新于2025-09-19 17:13:59
-
Fast parallel beam propagation method based on multi-core and many-core architectures
摘要： In this paper, a fast technique is suggested to accelerate the computation of the fast Fourier transform beam propagation method (FFT-BPM). The FFT-BPM is executed on a graphical processing unit (GPU) and multi-core processor GPUs to speed up the computation of huge number of propagation steps with a higher speed than the traditional CPU. Further, the suggested technique is implemented in parallel approach which is faster than serial implementation. The achieved speedup factor is 150× and 5× using GPU and eight cores multiprocessor, respectively with respect to a single core processing time of 215 steps input Gaussian beam. In order to verify the speed of the proposed technique, the possibility of using the BPM to compute the time-consuming Goos–H?nchen shift calculation is proposed. Further, the propagation of a single mode light beam in fiber optic for 5 × 106 steps is executed using GPU. It is found that the speed up of the studied mode is equal to 168x over a single core calculation.
关键词： Compute unified device architecture (CUDA),Parallel computing,Beam propagation method,Open multiprocessors (OpenMP),Graphical processing unit (GPU)
更新于2025-09-10 09:29:36