Silane Doping for Efficient Flexible Perovskite Solar Cells with Improved Defect Passivation and Device Stability,ACS Applied Materials & Interfaces

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Silane Doping for Efficient Flexible Perovskite Solar Cells with Improved Defect Passivation and Device Stability
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-04-23 , DOI: 10.1021/acsami.4c00887
Xiaomei Chen _{1,

2} , Ling Ai ₂ , Hong Ji ₂ , Weijie Song _{2,

3}

Affiliation

In this work, doping 3-amino-propyl triethoxysilane (APTES) into a perovskite precursor is proven to be an effective strategy, which can passivate crystal defects, control the crystallization rate, and improve the morphology. APTES can form oligomers through hydrolysis and a condensation reaction, thus blocking the invasion of external water molecules. In addition, the lone pair electrons on the N atom in the amino group of APTES form a coordination bond with perovskite by sharing the empty 6p orbital on Pb²⁺, which can effectively passivate the defects of the film and realize a highly uniform and dense perovskite film with preferential crystal growth orientation. The film exhibits high (110) crystal plane orientation and long carrier lifetime and mobility, which improves the performance of flexible perovskite solar cells. Using this approach, the champion device presents an optimal power conversion efficiency of 19.84% with much promoted air stability. Moreover, the efficiency of flexible devices does not decrease after maximum power point irradiation for 360 s.

中文翻译：

硅烷掺杂用于高效柔性钙钛矿太阳能电池，改善缺陷钝化和器件稳定性

在这项工作中，将3-氨基丙基三乙氧基硅烷（APTES）掺杂到钙钛矿前驱体中被证明是一种有效的策略，可以钝化晶体缺陷、控制结晶速率并改善形貌。 APTES可以通过水解和缩合反应形成低聚物，从而阻止外部水分子的侵入。此外，APTES氨基中N原子上的孤对电子通过共享Pb ²⁺上的空6p轨道与钙钛矿形成配位键，可以有效钝化薄膜的缺陷，实现高度均匀致密的薄膜。具有优先晶体生长方向的钙钛矿薄膜。该薄膜具有高（110）晶面取向以及较长的载流子寿命和迁移率，从而提高了柔性钙钛矿太阳能电池的性能。使用这种方法，冠军器件的最佳功率转换效率为 19.84%，空气稳定性也大大提高。此外，最大功率点照射360 s后，柔性器件的效率并未降低。

更新日期：2024-04-23

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