Unveiling the Influence of Additive Acidity on the Long-Term Stability of Perovskite Solar Cells

IF 8.7 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Materials Letters Pub Date : 2024-12-17 DOI:10.1021/acsmaterialslett.4c01998

Bihui Sun, Pingzhi Zhang, Daqing Zhang, Wenfei Chu, Yuxiao Guo*, Xin Luo, Wei Li* and Bo Xu*,

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Abstract

Additive engineering plays a vital role in enhancing perovskite solar cells (PSCs) by passivating defects within the perovskite films. Carboxyl and ester groups are commonly used for their strong binding with under-coordinated Pb²⁺ ions. However, the impact of additive acidity on the long-term stability of PSCs remains unclear. This study investigates the functional roles of 4-amino-3,5-difluorobenzoic acid (DFAB-A) and methyl 4-amino-3,5-difluorobenzoate (DFAB-AM), which could effectively passivate the film defects. However, the acidity resulting from carboxyl deprotonation in DFAB-A negatively impacts the structural stability of the perovskites. In contrast, DFAB-AM with its ester functionality forms stronger and more stable bonds, contributing to improved passivation and stability. PSCs incorporating DFAB-AM achieve a high power conversion efficiency of 22.51% and maintain 84.3% of their initial efficiency after 800 h of maximum-power-point operation. These findings underscore the importance of carbonyl group design in developing molecular additives to enhance both the efficiency and the durability of PSCs.

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揭示添加剂酸度对钙钛矿太阳能电池长期稳定性的影响

增材工程通过钝化钙钛矿薄膜内的缺陷，在增强钙钛矿太阳能电池（PSCs）性能方面起着至关重要的作用。羧基和酯基通常用于与欠配位Pb2+离子的强结合。然而，添加剂酸度对psc长期稳定性的影响尚不清楚。本研究考察了4-氨基-3,5-二氟苯甲酸（DFAB-A）和4-氨基-3,5-二氟苯甲酸甲酯（DFAB-AM）的功能作用，它们可以有效地钝化薄膜缺陷。然而，DFAB-A中羧基去质子化产生的酸性会对钙钛矿的结构稳定性产生负面影响。相比之下，具有酯功能的DFAB-AM形成更强、更稳定的键，有助于改善钝化和稳定性。采用DFAB-AM的psc可实现22.51%的高功率转换效率，并在最大功率点运行800小时后保持其初始效率的84.3%。这些发现强调了羰基设计在开发分子添加剂以提高psc的效率和耐久性方面的重要性。

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来源期刊

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.