Original Article:
Rubidium Fluoride Modified SnO2 for Planar n-i-p Perovskite Solar Cells
Jing Zhuang, et al.
Advanced Functional Materials, 2021, 31(17), 2010385.
10.1002/adfm.202010385
In recent years, planar structure n-i-p PSCs (perovskite solar cells) based on compact ETLs have gradually been favored by researchers due to their more convenient fabrication process and low-temperature sintering treatment. Among various compact ETLs (electron transport layers) for planar PSCs, tin oxide (SnO2) is one of the most widely studied materials. SnO2 shows higher electron mobility, better band alignment with perovskite and enhanced UV light stability, and thus is considered as an ETL candidate for planar PSCs.
In this work, the researchers introduced rubidium fluoride (RbF) into SnO2 hydrocolloid dispersion and SnO2 surface for the first time to study the effect of different modification methods on the photovoltaic performance of PSCs. The results of the study show that fluoride and rubidium ions play completely different roles in the two methods.
1. By introducing RbF into the SnO2 colloidal dispersion, the newly formed F-Sn bond changes the electron cloud density around the Sn atoms, which helps to enhance the electron mobility of SnO2. The SnO2-RbF based PSCs achieve a PCE as high as 21.27%, which is mainly attributed to the increase in short-circuit current (Jsc).
2. The introduction of RbF to the SnO2 surface causes a considerable portion of Rb+ to escape into the perovskite bulk, while F- tends to stay at the SnO2/perovskite interface. The escaped Rb+ suppresses ion migration in the perovskite bulk and reduces the trap density at the SnO2/perovskite interface, leading to an increase in the open circuit voltage (Voc) of the PSC from 1.131 V to 1.165 V.
Chemicals Related in the Paper:
| Catalog Number | Product Name | Structure | CAS Number | Price |
|---|---|---|---|---|
| ACM1332292 | Tin oxide |  |
1332-29-2 | Price |
| ACM16422676 | RUBIDIUM FLUORIDE HYDRATE |  |
16422-67-6 | Price |
