Influence of the Electric Potential on Charge Extraction and Interface Recombination in Perovskite Solar Cells,Physical Review Applied

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Influence of the Electric Potential on Charge Extraction and Interface Recombination in Perovskite Solar Cells
Physical Review Applied ( IF 3.8 ) Pub Date : 2021-07-16 , DOI: 10.1103/physrevapplied.16.014041
Christian Ahläng ₁ , Mathias Nyman ₁ , Ronald Österbacka _{1,

2}

Affiliation

The main losses in perovskite solar cells (PSCs) are often related to their charge-transport layers (CTLs). While it has been shown how losses related to charge extraction and recombination at the CTL interfaces can be minimized individually, a comprehensive picture is still lacking. In this work, we describe how recombination at interfaces is related to the distribution of electric potential within the device based on drift-diffusion simulations. Our results show that interface recombination in PSCs can only be fully understood when the whole device is considered. We find that devices with poor conductivity in the CTLs or small built-in potential will suffer from fast recombination at interfaces and that the interface recombination can be avoided by improving these. To illustrate our results, we present a framework that provides an intuitive way to understand electrical potential and compare losses in PSCs. We show that the simulation data can be well understood within the framework for the whole range of parameters studied.

中文翻译：

电位对钙钛矿太阳能电池电荷提取和界面复合的影响

钙钛矿太阳能电池 (PSC) 的主要损耗通常与其电荷传输层 (CTL) 相关。虽然已经表明如何将与 CTL 界面处的电荷提取和重组相关的损失单独最小化，但仍缺乏全面的了解。在这项工作中，我们基于漂移扩散模拟描述了界面处的复合如何与器件内的电势分布相关。我们的结果表明，只有在考虑整个设备时才能完全理解 PSC 中的界面重组。我们发现 CTL 中导电性差或内置电位小的器件会在界面处快速复合，并且可以通过改进这些来避免界面复合。为了说明我们的结果，我们提出了一个框架，该框架提供了一种直观的方式来了解 PSC 中的电位和比较损耗。我们表明，在研究的整个参数范围内，可以很好地理解模拟数据。

更新日期：2021-07-16

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