Importance of Functional Groups in Cross-Linking Methoxysilane Additives for High-Efficiency and Stable Perovskite Solar Cells,ACS Energy Letters

当前位置： X-MOL 学术 › ACS Energy Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Importance of Functional Groups in Cross-Linking Methoxysilane Additives for High-Efficiency and Stable Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2019-08-07 00:00:00 , DOI: 10.1021/acsenergylett.9b01356
Lin Xie _{1,

2} , Jiangzhao Chen ₁ , Parth Vashishtha ₃ , Xing Zhao ₁ , Gwang Su Shin ₁ , Subodh G. Mhaisalkar _{2,

3} , Nam-Gyu Park ₁

Affiliation

Here we report an efficient and reproducible multifunctional additive engineering strategy via methoxysilane cross-linking agents functionalized by the different terminal group, moderate electron-donating −SH, weak electron-donating −CH₃, or strong electron-withdrawing −CN, into a PbI₂ precursor solution. The power conversion efficiency (PCE) is increased from 18.4 to 20.8% after introduction of (3-mercaptopropyl)trimethoxysilane (MPTS) containing a −SH group as a consequence of improved voltage and current density, while 3-cyanopropyltriethoxysilane (CPTS) containing a −CN group deteriorates the overall photovoltaic performance. Moreover, −SH in MPTS is found to passivate defects effectively through a Lewis acid–base interaction with PbI₂, resulting in a larger grain size and a longer carrier lifetime. Owing to the formation of a cross-linking siloxane network as a protective layer on the grain boundary, the thermal and moisture stability of the device are improved remarkably. The present work provides a guideline for multifunctional additive engineering for the purpose of simultaneous achievement of a high PCE and long-term stability.

中文翻译：

高效稳定的钙钛矿太阳能电池中交联的甲氧基硅烷添加剂中官能团的重要性

在这里，我们通过甲氧基硅烷交联剂（由不同的端基，适度给电子的-SH，弱给电子的-CH ₃或强吸电子的-CN官能化）成PbI，报告了一种有效且可重现的多功能添加剂工程策略₂前体溶液。引入含有-SH基的（3-巯基丙基）三甲氧基硅烷（MPTS）后，由于改善了电压和电流密度，功率转换效率（PCE）从18.4提高到20.8％，而引入含有-SH基团的3-氰基丙基三乙氧基硅烷（CPTS） -CN基使整个光伏性能下降。此外，发现MPTS中的-SH通过路易斯酸碱与PbI _2的相互作用有效地钝化了缺陷。，导致更大的晶粒尺寸和更长的载流子寿命。由于在晶界上形成了交联硅氧烷网络作为保护层，因此显着提高了器件的热稳定性和湿气稳定性。本工作为同时实现高PCE和长期稳定性的目的，为多功能添加剂工程提供了指南。

更新日期：2019-08-07

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南