Analytical optimization of intermediate band systems: Achieving the best of two worlds,Progress in Photovoltaics

当前位置： X-MOL 学术 › Prog. Photovoltaics › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Analytical optimization of intermediate band systems: Achieving the best of two worlds
Progress in Photovoltaics ( IF 8.0 ) Pub Date : 2018-06-06 , DOI: 10.1002/pip.3020
Daniel Suchet _{1,

2} , Amaury Delamarre _{1,

2} , Nicolas Cavassilas _{2,

3} , Zacharie Jehl _{1,

2} , Yoshitaka Okada _{1,

2} , Masakazu Sugiyama _{1,

2} , Jean-Francois Guillemoles _{1,

2,

4}

Affiliation

Lagrange multipliers provide a powerful framework to devise the optimization of systems under constraints. It can be especially useful in the context of photovoltaics, where electrical or structural continuity relations impose connections between quantities, such as current matching between the different subcells of tandem devices. In this work, we apply this method to Intermediate band solar cell, an advanced concept for solar energy conversion in which 2 low‐energy photons can promote an electron to the conduction band through a so‐called intermediate band. We demonstrate that an intermediate band solar cell under solar spectrum cannot meet voltage preservation and current matching at the same time. By contrast, we show that the implementation of an energy shift (electronic ratchet) in any of the bands lifts one of the constraints set on the system and allows those 2 criteria to be filled simultaneously. Additional insights are provided by the numerical study of the short‐circuit current and fill factor of the systems at stake, which show that a system with ratchet benefits from the same current increase as a standard intermediate band solar cell (same short‐circuit current), while maintaining I‐V properties of a single junction (same open‐voltage circuit, same fill factor).

中文翻译：

中间带系统的分析优化：实现两个世界的最佳

拉格朗日乘数提供了一个强大的框架，可以设计约束条件下的系统优化。在光电或结构连续性关系将数量之间的连接（例如串联设备的不同子电池之间的电流匹配）强加于光伏的情况下，它可能特别有用。在这项工作中，我们将这种方法应用于中频太阳能电池，这是一种先进的太阳能转换概念，其中两个低能光子可以通过一个所谓的中频电子将电子提升到导带。我们证明了太阳光谱下的中频带太阳能电池不能同时满足电压保持和电流匹配的要求。相比之下，我们表明能量转换的实现（电子棘轮）在任何一个频段中都会解除系统上设置的约束条件之一，并允许同时填充这两个条件。通过对所涉及系统的短路电流和填充因子进行数值研究，可以得出更多的见解，这表明具有棘轮系统的系统受益于与标准中间带太阳能电池相同的电流增加（相同的短路电流），同时保持单个结的I-V特性（相同的开电压电路，相同的填充因数）。

更新日期：2018-06-06

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11