Abstract
In this work, Au NPs were produced by laser ablation in liquids method (LASis) in isopropyl alcohol (IPA) and processed onto the Spiro-OMeTAD (hole transport layer,HTL) in perovskite solar cells. Spiro-OMeTAD requires the use of additives to improve its electrical features, and these additives include the hygroscopic LiTFSI to promote the oxidation of this HTL. AFM images pointed out that the TFSI− precipitates along the surface of Spiro-OMeTAD with the aging time, thus resulting in reduced stability for devices operating in the air. Therefore, to avoid this problem, two procedures were adopted: washing the surface of Spiro-OMeTAD with IPA or processing the Au NPs onto the surface of Spiro-OMeTAD from IPA suspension. Both procedures were performed by spin coating method prior to the deposition of the top electrode. The photovoltaic response showed that the devices produced with modified HTL presented superior stability mainly due to the removal of TFSI− precipitates from the surface of the Spiro-OMeTAD and the residual excess of TFSI− that can be chemically adsorbed onto the gold surface via oxygen atoms.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.