The physics of ion migration in perovskite solar cells: Insights into hysteresis, device performance, and characterization,Progress in Photovoltaics

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The physics of ion migration in perovskite solar cells: Insights into hysteresis, device performance, and characterization
Progress in Photovoltaics ( IF 8.0 ) Pub Date : 2019-11-03 , DOI: 10.1002/pip.3203
Dongchen Lan ₁

Affiliation

Perovskite solar cells promise to reach the highest efficiencies at the lowest costs, but the mobile ions create challenges in both cell measurements and performance improvement. Being able to understand the ion migration mechanism and its impacts would help to solve relevant issues and may open up opportunities for further development. Although some efforts have been made here, explanations are often too exotic resulting in not only some controversies but the neglect of some important aspects addressable by familiar concepts. This paper uses familiar knowledge in solar cell device physics to explain the ion migration mechanism and its impacts under conditions of interests. It is shown that, when depletion layers contract such as in a forward current‐voltage scan, tardy ionic charges can distort the perovskite bands hence reduce the net currents before they move to new equilibriums, causing the hysteresis effect. As ion migration impacts the electron and hole distributions, it can affect the Shockley‐Read‐Hall and Auger processes differently, hence may either reduce or increase the ratio of radiative to nonradiative recombination. This previously unaddressed mechanism for variation in the electron‐hole recombination can explain photoluminescence quenching and enhancement as well as performance degradation and improvement during ion migration.

中文翻译：

钙钛矿太阳能电池中离子迁移的物理学：对滞后，器件性能和特性的洞察力

钙钛矿太阳能电池有望以最低的成本实现最高的效率，但是移动离子在电池测量和性能改进方面都带来了挑战。理解离子迁移机制及其影响将有助于解决相关问题，并可能为进一步发展打开机会。尽管这里已经做出了一些努力，但解释往往过于奇特，不仅引起一些争议，而且忽略了熟悉的概念可以解决的一些重要方面。本文利用太阳能电池设备物理学中的熟悉知识来解释离子迁移机理及其在感兴趣条件下的影响。结果表明，当耗尽层收缩时，例如在正向电流-电压扫描中，迟滞的离子电荷会扭曲钙钛矿带，从而在净电流移至新的平衡之前降低其净电流，从而引起磁滞效应。由于离子迁移会影响电子和空穴的分布，因此可能会不同地影响Shockley-Read-Hall和Auger过程，因此可能会降低或增加辐射与非辐射复合的比率。这种先前未解决的电子-空穴复合变化机理可以解释光致发光的猝灭和增强以及离子迁移过程中的性能下降和改善。因此可能会降低或增加辐射与非辐射复合的比例。这种先前未解决的电子-空穴复合变化机理可以解释光致发光的猝灭和增强以及离子迁移过程中的性能下降和改善。因此可以减少或增加辐射与非辐射复合的比例。这种先前未解决的电子-空穴复合变化机理可以解释光致发光的猝灭和增强以及离子迁移过程中的性能下降和改善。

更新日期：2019-11-03

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