短路条件下稳态载流子分布——电场的作用和同型pn太阳能电池的发电速率分布

IF 6 3区 工程技术 Q2 ENERGY & FUELS
Solar RRL Pub Date : 2025-09-05 DOI:10.1002/solr.202500437
Isshin Sumiyoshi, Yoshitaro Nose
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引用次数: 0

摘要

短路电流密度(JSC)代表了光伏发电的最大可提取电流,缩小其辐射极限对先进和新兴技术至关重要。然而,由于经典的电流密度表达式(与载流子浓度和准费米能级梯度成正比)在短路条件下变得繁琐,因此对其损耗的分析仍然没有结构化。因此,大多数模拟都集中在最大功率点上,没有明确的框架来确定JSC损耗或制定设计指南。在这里,我们使用电荷平衡框架来解决这个问题,其中电流密度的散度等于稳态下的净发电量。该公式将JSC的分析简化为识别在短路条件下控制多余载流子分布的主要因素,这是构成本工作主要贡献的方法。系统的SCAPS-1D模拟显示,这种分布主要由内部电场控制,而不是平衡载流子浓度,尽管漂移和扩散都有贡献。利用无限小光生切片进一步分析表明,每个多余载流子分布都由产生位点的峰值和延伸到非产生区域的尾部组成,两者都驱动重组。该框架为识别和减少JSC损失提供了直接的定量途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Steady-State Carrier Distribution under Short-Circuit Conditions—Role of Electric Field and Generation Rate Profiles in homo-pn Solar Cells

Steady-State Carrier Distribution under Short-Circuit Conditions—Role of Electric Field and Generation Rate Profiles in homo-pn Solar Cells

Short-circuit current density (JSC) represents the maximum extractable current for photovoltaics, and closing the gap to its radiative limit is crucial for advanced and emerging technologies. However, analysis of its losses remains unstructured, because the classical current density expression—proportional to carrier concentration and gradient of quasi-Fermi levels—becomes cumbersome under short-circuit conditions. Most simulations therefore focus on the maximum-power point, leaving no clear framework for pinpointing JSC losses or developing design guidelines. Here, we address this issue using a charge-balance framework, in which the divergence of current density equals the net generation at steady state. This formulation reduces the analysis of JSC to identifying the dominant factors governing the excess carrier distribution under short circuit conditions—an approach that constitutes the main contribution of this work. Systematic SCAPS-1D simulations of homo-pn solar cells reveal that this distribution is governed primarily by the internal electric field, rather than the equilibrium carrier concentration, although both drift and diffusion contribute. Analysis using infinitesimal photogeneration slices further shows that each excess carrier distribution consists of a peak at the generation site and tails extending into nongeneration regions, both of which drive recombination. This framework offers a direct, quantitative route for identifying and minimizing JSC losses.

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来源期刊
Solar RRL
Solar RRL Physics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
12.10
自引率
6.30%
发文量
460
期刊介绍: Solar RRL, formerly known as Rapid Research Letters, has evolved to embrace a broader and more encompassing format. We publish Research Articles and Reviews covering all facets of solar energy conversion. This includes, but is not limited to, photovoltaics and solar cells (both established and emerging systems), as well as the development, characterization, and optimization of materials and devices. Additionally, we cover topics such as photovoltaic modules and systems, their installation and deployment, photocatalysis, solar fuels, photothermal and photoelectrochemical solar energy conversion, energy distribution, grid issues, and other relevant aspects. Join us in exploring the latest advancements in solar energy conversion research.
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