Enhancing Performance and Stability of Perovskite Solar Cells with a Novel Formamidine Group Additive,Small

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Enhancing Performance and Stability of Perovskite Solar Cells with a Novel Formamidine Group Additive
Small ( IF 13.0 ) Pub Date : 2024-06-06 , DOI: 10.1002/smll.202402557
Jing Zhang ₁ , Yutong She ₁ , Yujie Zhu ₁ , Hang Su _{1,

2} , Xinxin Zheng ₁ , Yuyin Yao ₁ , Deng Li ₁ , Shengzhong (Frank) Liu _{1,

2,

3}

Affiliation

Perovskite materials, particularly FAPbI₃, have emerged as promising candidates for solar energy conversion applications. However, these materials are plagued by well-known defects and suboptimal film quality. Enhancing crystallinity and minimizing defect density are therefore essential steps in the development of high-performance perovskite solar cells. In this study, 1H-Pyrazole-1-carboximidamide hydrochloride (PCH) is introduced into FAPbI₃ perovskite films. The molecular structure of PCH features a pyrazole ring bonded to formamidine (FA). The FA moiety of PCH facilitated the incorporation of this additive into the film lattice, while the negatively charged pyrazole ring effectively passivated positively charged iodine vacancies. The presence of PCH led to the fabrication of an FAPbI₃ device with improved crystallinity, a smoother surface, and reduced defect density, resulting in enhanced V_oc and fill factor. A record power conversion efficiency of 24.62% is achieved, along with exceptional stability under prolonged air exposure and thermal stress. The findings highlight the efficacy of PCH as a novel additive for the development of high-performance perovskite solar cells.

中文翻译：

使用新型甲脒基团添加剂增强钙钛矿太阳能电池的性能和稳定性

钙钛矿材料，尤其是 FAPbI₃，已成为太阳能转换应用的有前途的候选材料。然而，这些材料受到众所周知的缺陷和次优的薄膜质量的困扰。因此，提高结晶度和最小化缺陷密度是开发高性能钙钛矿太阳能电池的重要步骤。在这项研究中，将 1H-吡唑-1-羧酰酰胺盐酸盐（PCH）引入 FAPbI₃ 钙钛矿薄膜中。PCH 的分子结构具有与甲脒（FA）键合的吡唑环。PCH 的 FA 部分有助于将该添加剂掺入薄膜晶格中，而带负电荷的吡唑环有效地钝化了带正电荷的碘空位。PCH 的存在导致制造出具有更高结晶度、更光滑表面和降低缺陷密度的 FAPbI₃ 器件，从而提高了 V_oc 和填充因子。实现了创纪录的 24.62% 的功率转换效率，以及在长时间空气暴露和热应力下的出色稳定性。研究结果强调了 PCH 作为开发高性能钙钛矿太阳能电池的新型添加剂的功效。

更新日期：2024-06-06

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