Impedance Spectroscopy of Perovskite Solar Cells: Studying the Dynamics of Charge Carriers Before and After Continuous Operation,Physica Status Solidi (A) - Applications and Materials Science

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Impedance Spectroscopy of Perovskite Solar Cells: Studying the Dynamics of Charge Carriers Before and After Continuous Operation
Physica Status Solidi (A) - Applications and Materials Science Pub Date : 2020-09-10 , DOI: 10.1002/pssa.202000291
Bekele Hailegnaw ₁ , Niyazi Serdar Sariciftci ₁ , Markus Clark Scharber ₁

Affiliation

The issue of long‐term stability is one of the main obstacles challenging the progress of perovskite solar cells (PSCs). To alleviate this issue, a thorough understanding of the degradation mechanisms of the device is required. Herein, electrochemical impedance measurements in combination with maximum power point (MPP) tracking are applied to characterize PSCs, aiming to gain an understanding of the charge carrier dynamics in the photoactive bulk and at the contact‐absorber‐interfaces under operation. Electrochemical impedance spectroscopy (EIS) results show that the device charge transport resistance and interface capacitance associated with charge accumulation at the interfaces are both increasing upon continuous operation. This suggests ion migration from the photoactive perovskite layer to the charge transport layer interfaces leaving defects in the bulk. This suggests that reduction of the device performance upon continuous operation is mainly related to the changes in the bulk of the photoactive perovskite film and ions migration.

中文翻译：

钙钛矿太阳能电池的阻抗谱：研究连续运行前后电荷载流子的动力学

长期稳定性问题是挑战钙钛矿太阳能电池（PSC）进展的主要障碍之一。为了缓解此问题，需要对设备的降级机理有透彻的了解。本文中，结合最大功率点（MPP）跟踪的电化学阻抗测量被用于表征PSC，目的是了解光敏块中以及操作中的接触吸收体界面的电荷载流子动力学。电化学阻抗谱（EIS）结果表明，器件的电荷传输电阻和与界面处电荷积累相关的界面电容在连续运行时都在增加。这表明离子从光活性钙钛矿层迁移到电荷传输层界面，从而在整体中留下缺陷。这表明连续操作时器件性能的下降主要与光活性钙钛矿膜的体积变化和离子迁移有关。

更新日期：2020-09-10

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