Modulation of Crystallisation Kinetics for Improving performance of FAPbI3 Solar Cells

Maity, Arghya (2025) Modulation of Crystallisation Kinetics for Improving performance of FAPbI3 Solar Cells. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS Dissertation of Arghya Maity (20MS038)) 20MS038_Thesis_file.pdf - Submitted Version Restricted to Repository staff only Download (6MB)

Abstract

The operational efficiency of formamidinium lead iodide (FAPbI3) perovskite photovoltaics is fundamentally limited by defect-mediated recombination and lattice straininduced voltage losses. This work demonstrates a chloride-based additive engineering strategy using long-chain diammonium chloride-based additives to simultaneously address structural and electronic disorder through antisolvent and post-treatment incorporation routes. Structural characterisation reveals that optimised integration of the additive significantly reduces lattice microstrain while enhancing crystallite orientation. These modifications correlate with marked improvements in optoelectronic quality, evidenced by suppressed sub-bandgap absorption and enhanced radiative recombination efficiency. Device integration demonstrates substantial performance gains across key photovoltaic parameters. The antisolvent incorporation route yields the highest open-circuit voltage improvement, attributed to effective chloride integration and strain relaxation at the perovskite lattice level. Post-treatment strategies show complementary benefits in surface defect passivation, enabling superior charge extraction efficiency. This work establishes chloride-based additive engineering as a versatile approach for overcoming efficiency-stability tradeoffs in perovskite photovoltaics through simultaneous bulk and interface optimization. 6

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