State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China.
Center for Micro-Photonics, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia.
Nat Commun. 2018 Nov 2;9(1):4609. doi: 10.1038/s41467-018-07099-9.
Perovskite solar cells (PSCs) have reached an impressive efficiency over 23%. One of its promising characteristics is the low-cost solution printability, especially for flexible solar cells. However, printing large area uniform electron transport layers on rough and soft plastic substrates without hysteresis is still a great challenge. Herein, we demonstrate slot-die printed high quality tin oxide films for high efficiency flexible PSCs. The inherent hysteresis induced by the tin oxide layer is suppressed using a universal potassium interfacial passivation strategy regardless of fabricating methods. Results show that the potassium cations, not the anions, facilitate the growth of perovskite grains, passivate the interface, and contribute to the enhanced efficiency and stability. The small size flexible PSCs achieve a high efficiency of 17.18% and large size (5 × 6 cm) flexible modules obtain an efficiency over 15%. This passivation strategy has shown great promise for pursuing high performance large area flexible PSCs.
钙钛矿太阳能电池 (PSCs) 的效率已超过 23%，令人印象深刻。其具有广阔发展前景的特性之一是低成本的溶液打印性，这对于柔性太阳能电池尤其重要。然而，在粗糙且柔软的塑料衬底上无滞后地打印大面积均匀的电子传输层仍然是一个巨大的挑战。在此，我们展示了槽模印刷高质量的氧化锡薄膜，用于高效柔性 PSCs。通过一种通用的钾界面钝化策略，无论采用何种制备方法，都可以抑制氧化锡层引起的固有滞后。结果表明，钾阳离子而不是阴离子有利于钙钛矿晶粒的生长、钝化界面，并有助于提高效率和稳定性。小尺寸柔性 PSCs 实现了 17.18%的高效率，而大尺寸（5×6cm）柔性模块的效率超过 15%。这种钝化策略为追求高性能大面积柔性 PSCs 提供了巨大的潜力。
