Record Efficiency Stable Flexible Perovskite Solar Cell Using Effective Additive Assistant Strategy,Advanced Materials

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Record Efficiency Stable Flexible Perovskite Solar Cell Using Effective Additive Assistant Strategy
Advanced Materials ( IF 27.4 ) Pub Date : 2018-07-11 , DOI: 10.1002/adma.201801418
Jiangshan Feng ₁ , Xuejie Zhu ₁ , Zhou Yang ₁ , Xiaorong Zhang ₁ , Jinzhi Niu ₁ , Ziyu Wang ₂ , Shengnan Zuo ₁ , Shashank Priya ₃ , Shengzhong (Frank) Liu _{1,

2} , Dong Yang _{1,

3}

Affiliation

Even though the power conversion efficiency (PCE) of rigid perovskite solar cells is increased to 22.7%, the PCE of flexible perovskite solar cells (F‐PSCs) is still lower. Here, a novel dimethyl sulfide (DS) additive is developed to effectively improve the performance of the F‐PSCs. Fourier transform infrared spectroscopy reveals that the DS additive reacts with Pb²⁺ to form a chelated intermediate, which significantly slows down the crystallization rate, leading to large grain size and good crystallinity for the resultant perovskite film. In fact, the trap density of the perovskite film prepared using the DS additive is reduced by an order of magnitude compared to the one without it, demonstrating that the additive effectively retards transformation kinetics during the thin film formation process. As a result, the PCE of the flexible devices increases to 18.40%, with good mechanical tolerance, the highest reported so far for the F‐PSCs. Meanwhile, the environmental stability of the F‐PSCs significantly enhances by 1.72 times compared to the device without the additive, likely due to the large grain size that suppresses perovskite degradation at grain boundaries. The present strategy will help guide development of high efficiency F‐PSCs for practical applications.

中文翻译：

使用有效的添加剂辅助策略来记录效率稳定的柔性钙钛矿太阳能电池

即使刚性钙钛矿太阳能电池的功率转换效率（PCE）提高到22.7％，但柔性钙钛矿太阳能电池（F-PSC）的PCE仍然较低。在这里，开发了一种新型的二甲基硫醚（DS）添加剂，以有效地改善F-PSC的性能。傅里叶变换红外光谱显示DS添加剂与Pb ²⁺反应形成螯合的中间体，这会大大减慢结晶速度，导致较大的晶粒尺寸和所得钙钛矿薄膜的良好结晶度。实际上，与不使用DS添加剂的钙钛矿膜相比，使用钙钛矿膜制备的钙钛矿膜的陷阱密度降低了一个数量级，表明该添加剂有效地阻碍了薄膜形成过程中的转变动力学。结果，柔性设备的PCE增加到18.40％，具有良好的机械公差，这是迄今为止F-PSC的最高记录。同时，与不含添加剂的装置相比，F-PSC的环境稳定性显着提高了1.72倍，这可能是由于较大的晶粒尺寸抑制了晶界处钙钛矿的降解。

更新日期：2018-07-11

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