用深度学习自动提取二维晶体管物理参数,精度高且无需大量仿真数据。
Deep Learning to Automate Parameter Extraction and Model Fitting of Two-Dimensional Transistors
- 通过预训练神经网络模拟物理器件,用少量仿真数据实现高效参数提取。
- 在实验数据上拟合达到中位R²=0.99,35个参数同时反演仍保持稳定性能。
- 适用于复杂器件结构,开源代码助力逆向设计研究,适合芯片研发与材料优化人员。
我们提出一种深度学习方法,从电学测量数据中自动提取二维晶体管的物理参数(如迁移率、肖特基势垒高度、缺陷分布等),实现自动化参数提取与技术计算机辅助设计(TCAD)拟合。为支持该任务,我们采用简单的数据增强与预训练策略,通过训练一个次级神经网络逼近基于物理的器件仿真器。该方法仅需约500个器件的物理仿真数据即可实现高质量拟合,相较其他近期工作减少超40倍的数据需求。因此,拟合可基于包含复杂几何、自洽输运和静电效应的严格TCAD模型,而不仅限于计算成本低的紧凑模型。我们将该方法应用于实验单层WS₂晶体管,反演结果的中位系数决定(R²)达0.99。同时验证其可扩展性:在高电子迁移率晶体管上同时拟合35个参数仍表现良好。为促进未来研究,我们已公开代码与样本数据集。
原文摘要 · Abstract (English)
We present a deep learning approach to extract physical parameters (e.g., mobility, Schottky contact barrier height, defect profiles) of two-dimensional (2D) transistors from electrical measurements, enabling automated parameter extraction and technology computer-aided design (TCAD) fitting. To facilitate this task, we implement a simple data augmentation and pre-training approach by training a secondary neural network to approximate a physics-based device simulator. This method enables high-quality fits after training the neural network on electrical data generated from physics-based simulations of ~500 devices, a factor >40$\times$ fewer than other recent efforts. Consequently, fitting can be achieved by training on physically rigorous TCAD models, including complex geometry, self-consistent transport, and electrostatic effects, and is not limited to computationally inexpensive compact models. We apply our approach to reverse-engineer key parameters from experimental monolayer WS$_2$ transistors, achieving a median coefficient of determination ($R^2$) = 0.99 when fitting measured electrical data. We also demonstrate that this approach generalizes and scales well by reverse-engineering electrical data on high-electron-mobility transistors while fitting 35 parameters simultaneously. To facilitate future research on deep learning approaches for inverse transistor design, we have published our code and sample data sets online.
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