High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO<sub>2</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30104663.
- Also identified by DOI 10.1038/s41467-018-05760-x and PMC identifier 6089874.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
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<sub>2</sub>) electron-transport layer. The Fermi level of EDTA-complexed SnO<sub>2</sub> 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<sub>2</sub>. The record power conversion efficiency of planar-type PSCs with EDTA-complexed SnO<sub>2</sub> increases to 21.60% (certified at 21.52% by Newport) with negligible hysteresis. Meanwhile, the low-temperature processed EDTA-complexed SnO<sub>2</sub> enables 18.28% efficiency for a flexible device. Moreover, the unsealed PSCs with EDTA-complexed SnO<sub>2</sub> 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<sup>-2</sup>.