Past Events

Abstract
 

Perovskite solar cells (PSCs) are one of promising candidates for renewable energy supplies. Their efficiency has rapidly increased from 3.8 to 25.2% in the recent decade. The progress has been enabled by research in all relevant parts of the device, such as quality and composition of the perovskite absorber layer, n/p type semiconductor materials as electron/hole extraction layer (E/HTL), electrode layers, as well as interfaces between those layers. However, despite high efficiencies, inferior stability with exposure to moisture, light and elevated temperature, along with lead toxicity, are crucial issues impeding wider industrialization of PSCs. E/HTL not only have impact on the charge extraction from the perovskite layer, which is affected by the energy level alignment, but also directly affect the formation of perovskite layer during fabrication procedure. Interlayer or defect passivation between E/HTL and perovskite interfaces are approaches to achieve higher efficiency and stability. Investigations of the interface reveal that the distortion on interface may result in carrier recombination and reduced PSCs device efficiency. Moreover, interfaces are considered active sites affecting perovskite degradation. We propose research on perovskite fabrication with different SnO2 ETL to investigate how the ETL properties affect the ETL/perovskite interface and ultimately PSC performance. In addition to the investigation of interface effect on performance by quantifying recombination losses and interfacial defect densities, we will investigate device degradation process upon ambient exposure and/or illumination via in-situ XPS.

Anyone interested is welcome to attend.