Perovskite solar cells are steadily approaching commercial deployment, however, this technology still requires improvements to ensure long-term durability. It is predicted that perovskite and Si solar cells will complement each other in the future to boost generation of electricity. The efficiency of perovskite solar cells is strongly influenced by defects at heterojunction interfaces and grain boundaries, including ionic defects, methylammonium vacancies, and uncoordinated Pb²?. The surface passivation using compounds containing guanidine, quaternary ammonium salts or ammonium iodide can enhance crystal quality of perovskite, thereby increasing electron extraction from the absorber layer and ensuring efficient charge transport to the respective contacts. Furthermore, passivation can help protect the perovskite surface from ambient conditions and suppress ion migration to functional layers of perovskite-based device.
The aim of this project is to design and synthesize new small molecules containing ammonium, quaternary ammonium, guanidine, and other anchoring groups, with a focus on enhancing the photovoltaic performance of solar cells through the passivation of perovskite surface.
Project funding:
The project is funded by the internal funds of the Chemical Technology under the Research Projects Funding Initiative
Project results:
The expected outcomes of this project are new ionic (e.g., guanidine, quaternary ammonium halides or ammonium iodide etc.) group-functionalized compounds that are able to modify perovskite surface, and achieve noticeable improvements in device efficiency and long-term stability. The project will also study the relationship between the molecular structure and properties of these compounds. The expected Technology Readiness Level (TRL) is TPL 6, as a prototype of perovskite solar cells will be constructed.
Period of project implementation: 2026-09-01 - 2027-06-30
Project coordinator: Kaunas University of Technology
