Multifunctional potassium hexafluorophosphate passivate interface defects for high efficiency perovskite solar cells

Defects Passivation Strategy for Efficient and Stable Perovskite Solar Cells

“…Reproduced with permission. [39] Copyright 2017, Elsevier. , the multifunctional material potassium hexafluorophosphate (KPF 6 ) was proved to be an effective SnO 2 quantum dots (QDs)/perovskite interface passivation through forming a strong hydrogen bond linkage between PF 6 − group and organic cations in the perovskite, as shown in Figure 4g.…”

“…Consequently, a champion PCE of over 21% was achieved after KPF 6 treated the SnO 2 QD/perovskite interface, and the devices maintain 90% of initial efficiency after 720 h storage in dry air. [39] Bi and Liu's research group similarly revealed that the existence of the coordination bond effectively passivated the ETL surface, and they improved the photoelectric performance of PSCs to varying degrees. [40] Fullerene derivatives with excellent electrical properties and multifunctional chemical parts have been extensively used to modify the n-i-p device's surface defect states.…”

A π-extended triphenylamine based dopant-free hole-transporting material for perovskite solar cells via heteroatom substitution

“…These are deeper than that of the wellknown and established Spiro-OMeTAD (À5.09 eV) system. 29,34 Moreover, their HOMO levels are slightly higher than the valence-band maximum of perovskites (such as CH 3 NH 3 PbI 3 , À5.45 eV), 35 which allows for efficient hole transfer from the perovskite to the HTM. Additionally, we also noticed a pattern whereby the HOMO energy levels increase as the atomic number of the elements increases within the same period (Fig.…”

Advances in SnO2-based perovskite solar cells: from preparation to photovoltaic applications

“…Moreover, KPF6 passivated the interfacial traps to suppress the energy level traps to improve the conductivity of SnO 2 through the solid ionic bonds between the PF 6 À group and Sn 4+ /Sn 2+ . 199…”