Divalent Anionic Doping in Perovskite Solar Cells for Enhanced Chemical Stability. Issue 34 (8th July 2018)

• Record Type: Journal Article
• Authors: Gong, Jue; Yang, Mengjin; Rebollar, Dominic; Rucinski, Jordan; Liveris, Zachary; Zhu, Kai; Xu, Tao
• Is Part Of: Advanced materials. Volume 30:Issue 34(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-07-08
• Subjects: chemical doping -- iodine diffusion -- moisture stability -- perovskite solar cells; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201800973
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: The chemical stabilities of hybrid perovskite materials demand further improvement toward long‐term and large‐scale photovoltaic applications. Herein, the enhanced chemical stability of CH3 NH3 PbI3 is reported by doping the divalent anion Se 2− in the form of PbSe in precursor solutions to enhance the hydrogen‐bonding‐like interactions between the organic cations and the inorganic framework. As a result, in 100% humidity at 40 °C, the 10% w/w PbSe‐doped CH3 NH3 PbI3 films exhibited >140‐fold stability improvement over pristine CH3 NH3 PbI3 films. As the PbSe‐doped CH3 NH3 PbI3 films maintained the perovskite structure, a top efficiency of 10.4% with 70% retention after 700 h aging in ambient air is achieved with an unencapsulated 10% w/w PbSe:MAPbI3 ‐based cell. As a bonus, the incorporated Se 2− also effectively suppresses iodine diffusion, leading to enhanced chemical stability of the silver electrodes. Abstract : The chemical stabilities of CH3 NH3 PbI3 thin films and solar cells are greatly improved when PbSe dopant is added in the precursor solutions, where Se 2− forms strong electrostatic interactions with CH3 NH3 + and results in >140‐fold enhancement of film moisture stability, >70% retention of photovoltaic performance after 700 h of air aging, and suppressed iodine diffusion in solar‐cell devices.