Spectroscopic Insight into Efficient and Stable Hole Transfer at the Perovskite/Spiro-OMeTAD Interface with Alternative Additives,ACS Applied Materials & Interfaces

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Spectroscopic Insight into Efficient and Stable Hole Transfer at the Perovskite/Spiro-OMeTAD Interface with Alternative Additives
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-01-20 , DOI: 10.1021/acsami.0c19111
Weijian Chen _{1,

2} , Ngoc Duy Pham _{3,

4} , Hongxia Wang _{3,

4} , Baohua Jia ₁ , Xiaoming Wen ₁

Affiliation

A stable and efficient carrier transfer is a prerequisite for high-performance perovskite solar cells. With optimized additives, a significantly improved charge carrier transfer can be achieved at the interface of perovskite/2,2′,7,7′-tetrakis-(N,N-di-4-methoxyphenylamino)-9,90-spirobifluorene (Spiro-OMeTAD) with significantly boosted photostability. Using time-dependent spectroscopic techniques, we investigated charge carrier and mobile-ion dynamics at the perovskite/Spiro-OMeTAD interface, where the Spiro-OMeTAD contains different bis(trifluoromethanesulfonyl)imide (TFSI) salts additives (Li-TFSI, Mg-TFSI₂, Ca-TFSI₂). The pristine response and the dynamic changes under continuous illuminations are presented, which is correlated to the different behaviors of mobile-ion accumulations at the perovskite/Spiro interface and ascribed to the improved hole mobilities in Spiro-OMeTAD, ultimately contributing to the favorable behaviors in solar cells. It is demonstrated that the hole mobility and conductivity of hole transport layers play an important role in suppressing mobile-ion accumulation at the interfaces of solar cells. With the engineering of mixed-cation mixed-halide perovskite, optimal engineering of additives in hole transport materials is an efficient strategy. Therefore, it should be emphasized for accelerating perovskite photovoltaic commercialization.

中文翻译：

在钙钛矿/ Spiro-OMeTAD界面上使用替代添加剂的高效稳定空穴转移的光谱学洞察

稳定高效的载流子传输是高性能钙钛矿太阳能电池的先决条件。使用优化的添加剂，可以在钙钛矿/ 2,2'，7,7'-四（-N，N-二-4-甲氧基苯基氨基）-9,90-螺双芴（Spiro）的界面上实现显着改善的载流子转移-OMeTAD），大大提高了光稳定性。使用随时间变化的光谱技术，我们研究了钙钛矿/ Spiro-OMeTAD界面处的载流子和移动离子动力学，其中Spiro-OMeTAD包含不同的双（三氟甲磺酰基）酰亚胺（TFSI）盐添加剂（Li-TFSI，Mg-TFSI ₂，钙TFSI ₂）。提出了原始反应和在连续光照下的动态变化，这与钙钛矿/ Spiro界面上的移动离子积累的不同行为相关，并归因于Spiro-OMeTAD中空穴迁移率的提高，最终促成了在Spro-OMeTAD中的良好行为。太阳能电池。结果表明，空穴迁移层的空穴迁移率和电导率在抑制移动离子在太阳能电池界面处的积累方面起着重要作用。通过混合阳离子混合卤化物钙钛矿的工程设计，空穴传输材料中添加剂的最佳工程设计是一种有效的策略。因此，应强调促进钙钛矿光伏商业化。

更新日期：2021-02-03

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