The electron transport layer (ETL) in a perovskite solar cell extracts photo-generated electrons from the perovskite absorber and prevents their recombination with holes. Commonly used ETL’s are organic layers comprised of fullerenes or fullerene derivatives such as C60 and PCBM. Inorganic ETL’s are attractive due to their barrier functionality against moisture and heat. They can be used as buffer layers for sputtering transparent conductive oxides to fabricate tandem devices, and they are compatible with high-temperature encapsulation. Inorganic ETL’s also exhibit higher carrier mobility and mechanical stability when compared to their organic counterparts.
Atmospheric Pressure Chemical Vapor Deposition (AP-CVD) is an attractive and cost-effective method of depositing inorganic ETL’s. The open air process requires no high vacuum or expensive equipment and can be done at low temperatures. As a result, the energy costs are low and the process is scalable to large area device fabrication.
National Science Foundation Graduate Research Fellowship (2018-2021)