This is the Interim Public Dissemination Report for this project. This project aims to demonstrate high efficiency triple-junction Si-perovskite-perovskite solar cells. In addition, research directions in terms of cell design and material choice will be identified based on technology-economic-analysis.
The work packages are:
- develop novel bottom Si cell designs with innovative contacting and interfacing schemes with perovskite middle cell such as the use of polycrystalline-silicon in conjunction with an interfacial oxide;
- develop low cost interfacing strategies for middle and top perovskite sub-cells such as the use of metal oxide being more stable than organic interlayers; exploration of various deposition techniques (e.g., atomic layer deposition vs solution process vs sputtering vs pulsed laser deposition) paying attention to process compatibility for monolithic tandem integration. Indium-tin-oxide-free (ITO-free) interfacing will also be explored;
- demonstrate efficient and stable high bandgap top junction perovskite multi-crystalline thin film and perovskite quantum dot (QD) sub-cells. Strategies include composition engineering, quantum dot size engineering and layer-by-layer coating-with-ligand-exchange-process development and optimisation; and
- carry out techno-economic analysis on various possible Si-perovskite-perovskite tandem structures to identify cost drivers and suggest low cost alternatives (e.g., new Si bottom cell designs, for perovskite absorber layers, interlayers, hole transport layers and electron transport layers) to guide future research. The impact of cell lifetime (durability) on levelized cost of electricity (LCOE) will also be analysed and reported.