Pen-Tung Sah Institute of Micro-Nano Science and Technology , Xiamen University , Xiamen 361005 , China.
Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education; National Engineering Research Center for Advanced Polymer Processing Technology , Zhengzhou University , Zhengzhou 450002 , China.
ACS Appl Mater Interfaces. 2019 Sep 18;11(37):33770-33780. doi: 10.1021/acsami.9b07610. Epub 2019 Aug 14.
TiO nanorod (NR) array for perovskite solar cells (PSCs) has attained great importance due to its superb power conversion efficiency (PCE) compared to that of the traditional mesoporous TiO film. A TiO compact layer for the growth of TiO NR array via spin-coating cannot meet the requirements for efficient NR-based PSCs. Herein, we have developed and demonstrated the insertion of a bifunctional extrathin TiO interlayer (5 nm) by atomic layer deposition (ALD) at the interface of the fluorine-doped tin oxide (FTO)/TiO compact layer to achieve alleviated electron exchange and a reduced energetic barrier. Thus, an accelerated extraction of electrons from TiO NR arrays via the compact layer and their transfer to the FTO substrate can improve the PSC efficiency. The thickness of the spin-coated TiO compact layer on the ALD-deposited TiO layer is spontaneously optimized. Finally, an outstanding efficiency of 20.28% has been achieved from a champion PSC with negligible hysteresis and high reliability. To the best of our knowledge, this is the first study demonstrating the superiority of TiO-NR-based PSCs withstanding the dry heat and thermal cycling tests. The results are of great importance for the preparation of efficient and durable PSCs for real-world applications.
TiO 纳米棒（NR）阵列在钙钛矿太阳能电池（PSCs）中得到了广泛关注，因为与传统的介孔 TiO2 薄膜相比，其具有卓越的功率转换效率（PCE）。通过旋涂法在 TiO2 NR 阵列生长过程中形成的 TiO2 致密层无法满足高效 NR 基 PSCs 的要求。在此，我们通过原子层沉积（ALD）开发并证明了在掺氟氧化锡（FTO）/TiO2 致密层界面插入双功能超薄 TiO2 界面层（5nm），以实现减轻电子交换和降低能垒。因此，通过致密层从 TiO2 NR 阵列中加速提取电子并将其转移到 FTO 衬底可以提高 PSC 的效率。ALD 沉积的 TiO2 层上旋涂 TiO2 致密层的厚度会自动优化。最终，在没有迟滞和高可靠性的情况下，从一个具有代表性的器件中获得了 20.28%的卓越效率。据我们所知，这是第一个证明基于 TiO2-NR 的 PSCs 在经受干热和热循环测试时具有优越性的研究。这些结果对于制备高效和耐用的 PSCs 以满足实际应用具有重要意义。
