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Photodetector with Controlled Relocation of Carrier Density Peaks: Concept and Numerical Simulation
摘要： Modern electronics faces the degradation of metal interconnection performance in integrated circuits with nanoscale feature dimensions of transistors. The application of constructively and technologically integrated optical links instead of metal wires is a promising way of the problem solution. Previously, we proposed the advanced design of an on-chip injection laser with an AIIIBV nanoheterostructure, and a functionally integrated optical modulator. To implement the efficient laser-modulator-based optical interconnections, technologically compatible photodetectors with subpicosecond response time and sufficient sensitivity are required. In this paper, we introduce the concept of a novel high-speed photodetector with controlled relocation of carrier density peaks. The device includes a traditional p-i-n photosensitive junction and an orthogonally oriented control heterostructure. The transverse electric field displaces the peaks of electron and hole densities into the regions with low carrier mobilities and lifetimes during the back edge of an optical pulse. This relocation results in the fast decline of photocurrent that does not depend on the longitudinal transport of electrons and holes. We develop a combined numerical model based on the Schrodinger-Poisson equation system to estimate the response time of the photodetector. According to the simulation results, the steep part of the photocurrent back edge has a duration of about 0.1 ps.
关键词： combined numerical model,high-speed AIIIBV optoelectronic devices,photodetector with controlled relocation of carrier density peaks,on-chip optical interconnections,Schrodinger-Poisson equation system
更新于2025-09-23 15:19:57
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Theoretical Study and Estimation of Recombination Rate and Photocurrent of Quantum Dot Solar Cell using Homotopy Analysis
摘要： The objective of this study is to develop the numerical model of InGaAs QD solar cell to describe the device characteristics. The developed model is based on Homotopy analysis which provides self-consistent and nonlinear solutions to 3D Poisson and Schrodinger equations. The exact potential and energy profile of the quantum dot accounts for the estimation of current under dark condition. The model is used in photocurrent determination of quantum dot solar cell under 1 Sun, 1.5 AM condition over a range of various solar cell parameters such as optical generation life time, quantum dot concentration and number of quantum dot layer. The quantum wavelength and quantum dot layers are used to calculate the photocurrent, recombination rate and conversion efficiency. The photocurrent has achieved its superiority with optimum quantum dot layers and wavelength. The results obtained show that the photocurrent is strongly sensitive to the above dependences and a good agreement with the experimental results was evidenced.
关键词： quantum dot,poisson equation,Homotopy analysis,solar cell,schrodinger equation
更新于2025-09-19 17:13:59
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Optimization of MAPbI$_3$-Based Perovskite Solar Cell With Textured Surface
摘要： In this article, the optimized condition for a perovskite solar cell (PSC) with textured surface has been calculated. To accurately model the transport in organic material and organic/inorganic interface, the Gaussian-like density of state function was utilized into Poisson and drift-diffusion solver to present the tail states in the organic material. To calibrate the simulation model, the planar structures with published experimental results are compared. Our results show that the textured structure can improve the open-circuit voltage (Voc) and fill factor and overcome the major problem of PSC because of the short diffusion length. Finally, the efficiency has been improved from 17.8% (planar) to 20.8% (textured). If the metal contact with a suitable work function is chosen, it can be further improved to 22.9%.
关键词： perovskite solar cell (PSC),organic material,MAPbI3,Poisson equation,Drift-diffusion equation,2-D finite-difference time domain (FD-TD),tail states model
更新于2025-09-12 10:27:22
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Guidelines for Underwater Image Enhancement Based on Benchmarking of Different Methods
摘要： Images obtained in an underwater environment are often affected by colour casting and suffer from poor visibility and lack of contrast. In the literature, there are many enhancement algorithms that improve different aspects of the underwater imagery. Each paper, when presenting a new algorithm or method, usually compares the proposed technique with some alternatives present in the current state of the art. There are no studies on the reliability of benchmarking methods, as the comparisons are based on various subjective and objective metrics. This paper would pave the way towards the definition of an effective methodology for the performance evaluation of the underwater image enhancement techniques. Moreover, this work could orientate the underwater community towards choosing which method can lead to the best results for a given task in different underwater conditions. In particular, we selected five well-known methods from the state of the art and used them to enhance a dataset of images produced in various underwater sites with different conditions of depth, turbidity, and lighting. These enhanced images were evaluated by means of three different approaches: objective metrics often adopted in the related literature, a panel of experts in the underwater field, and an evaluation based on the results of 3D reconstructions.
关键词： automatic colour equalization,3D reconstruction,non-local dehazing,benchmark,lab,colour correction,screened poisson equation,CLAHE,underwater image enhancement,dehazing
更新于2025-09-09 09:28:46