Tunnel Oxide Passivated Contact (TOPCon) solar cell technology leapt from 23% market share in 2023 to 70% in 2024, and may break 80% in 2025. The Indian solar industry, which has previously been as much as 7 years behind China’s technologically, is shortening that gap considerably by adopting TOPCon. TOPCon didn’t just have the short-term advantage of easier retrofitting onto many Mono PERC production lines – it also boasted lower silver paste usage compared to heterojunction, more or less equal efficiency ratings (though it varies from product to product), and at first was touted as a more convenient partner for perovskites in tandem setups. TOPCon’s theoretical maximum efficiency is 28.7%, with the highest-rated actual products being Trina Solar’s 26.6%-efficient cell…