Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education; Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China.
Center for Energy Harvesting Materials and System (CEHMS), Virginia Tech, Blacksburg, VA, 24061, USA.
Nat Commun. 2018 Aug 13;9(1):3239. doi: 10.1038/s41467-018-05760-x.
Even though the mesoporous-type perovskite solar cell (PSC) is known for high efficiency, its planar-type counterpart exhibits lower efficiency and hysteretic response. Herein, we report success in suppressing hysteresis and record efficiency for planar-type devices using EDTA-complexed tin oxide (SnO) electron-transport layer. The Fermi level of EDTA-complexed SnO is better matched with the conduction band of perovskite, leading to high open-circuit voltage. Its electron mobility is about three times larger than that of the SnO. The record power conversion efficiency of planar-type PSCs with EDTA-complexed SnO increases to 21.60% (certified at 21.52% by Newport) with negligible hysteresis. Meanwhile, the low-temperature processed EDTA-complexed SnO enables 18.28% efficiency for a flexible device. Moreover, the unsealed PSCs with EDTA-complexed SnO degrade only by 8% exposed in an ambient atmosphere after 2880 h, and only by 14% after 120 h under irradiation at 100 mW cm.
尽管介孔型钙钛矿太阳能电池 (PSC) 以高效率而闻名，但它的平面型对应物表现出较低的效率和滞后响应。在此，我们报告了使用 EDTA 络合氧化锡 (SnO) 电子传输层成功抑制平面型器件中的滞后并记录效率。EDTA 络合 SnO 的费米能级与钙钛矿的导带更好地匹配，导致开路电压较高。其电子迁移率大约是 SnO 的三倍。具有 EDTA 络合 SnO 的平面型 PSCs 的记录功率转换效率增加到 21.60%（由 Newport 认证为 21.52%），几乎没有滞后。同时，低温处理的 EDTA 络合 SnO 使柔性器件的效率达到 18.28%。此外，在暴露于大气环境 2880 小时后，具有 EDTA 络合 SnO 的未密封 PSCs 仅降解 8%，在 100 mW/cm 的辐照下 120 小时后仅降解 14%。
