Insights about ionic migration in perovskite solar cells using electrochemical impedance spectroscopy

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-02-17 DOI:10.1016/j.matlet.2025.138255

Lucas Polimante, Thayna M.G. dos Santos, Daniel Z. Florio, Andre S. Polo

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Abstract

Perovskite Solar Cells are an emerging renewable energy technology for the future due to their high efficiency in converting light into electricity. However, these devices suffer from durability issues ascribed to ionic migration, and Electrochemical Impedance Spectroscopy (EIS) is a powerful tool for identifying and quantifying this process. In this work, Perovskite Solar Cells (PSCs) were prepared using two different perovskite compositions, first only with methylammonium (MAPI), and then with a mixture of 1:1 methylammonium and formamidinium (MA_0.5FA_0.5PI), which is known to be more durable than the first one. The PSCs exhibited reproducible photovoltaic parameters, resulting in a PhotoConversion Efficiency (PCE) average of 13 % using both perovskites. EIS of PSCs using MAPI and MA_0.5FA_0.5PI exhibited two arcs in their Nyquist diagrams, which were fitted using a Voight circuit. The high-frequency region of MAPI and MA_0.5FA_0.5PI samples exhibited similar time constants of 17.7 and 12.8 µs, respectively, ascribed to electronic processes at the PSC interfaces, following the PCEs determined. The constant phase element of the low-frequency region exhibited time constants of 107.5 and 301.3 ms, respectively for MAPI and MA_0.5FA_0.5PI. This time constant is associated with ion migration processes responsible for inducing defects, consequently decreasing the durability of solar cells. Thus, it is observed that the presence of formamidinium cations increases the time constant determined for MA_0.5FA_0.5PI due to a slower ionic migration, leading to a more durable perovskite.

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive