Liu Chang, Zhou Xianyong, Chen Shuming, Zhao Xingzhong, Dai Songyuan, Xu Baomin
SUSTech Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen Guangdong Province 518055 China.
Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen Guangdong Province 518055 China.
Adv Sci (Weinh). 2019 Feb 7;6(7):1801169. doi: 10.1002/advs.201801169. eCollection 2019 Apr 3.
The utilization of an inorganic hole-transport layer (HTL) is one of the most effective methods to improve the stability and reduce the cost of perovskite solar cells (PSCs). However, achieving high-quality inorganic HTL films, especially HTL films in n-i-p structures, via solution processes remains a big challenge. Here, a simple surface modification strategy for low-cost and stable cuprous oxide (CuO) quantum dots is proposed, which utilizes a silane coupling agent. The modified CuO can be directly deposited on the perovskite film as the top HTL without decomposing the perovskite to maintain an n-i-p structure. The efficiency (18.9%) of PSCs with surface-modified CuO as the HTL is significantly higher than that (11.9%) of PSCs with unmodified CuO, which is also the record efficiency for a CuO-based perovskite solar cell in n-i-p structure. The enhanced performance of PSCs is attributed to the remarkably enhanced film properties achieved through surface modification. Moreover, because of the dopant-free technology and hydrophobic surface, the CuO-based PSCs have distinctly better stability than 2,2',7,7'-tetrakis[,-di(4-methoxyphenyl)amino]-9,9'-spiro-bifluorene-based PSCs.
使用无机空穴传输层（HTL）是提高钙钛矿太阳能电池（PSC）稳定性和降低成本的最有效方法之一。然而，通过溶液法制备高质量的无机HTL薄膜，尤其是n-i-p结构中的HTL薄膜，仍然是一个巨大的挑战。在此，我们提出了一种利用硅烷偶联剂对低成本且稳定的氧化亚铜（CuO）量子点进行简单表面改性的策略。改性后的CuO可以直接沉积在钙钛矿薄膜上作为顶部HTL，而不会分解钙钛矿，从而保持n-i-p结构。以表面改性的CuO作为HTL的PSC的效率（18.9%）显著高于以未改性CuO作为HTL的PSC的效率（11.9%），这也是基于CuO的n-i-p结构钙钛矿太阳能电池的最高效率记录。PSC性能的提高归因于通过表面改性实现的显著增强的薄膜性能。此外，由于无掺杂技术和疏水表面，基于CuO的PSC比基于2,2',7,7'-四[,-二（4-甲氧基苯基）氨基]-9,9'-螺二芴的PSC具有明显更好的稳定性。
