Sublimed C₆₀ for efficient and repeatable perovskite-based solar cells.

ABSTRACT: Thermally evaporated C₆₀ is a near-ubiquitous electron transport layer in state-of-the-art p-i-n perovskite-based solar cells. As perovskite photovoltaic technologies are moving toward industrialization, batch-to-batch reproducibility of device performances becomes crucial. Here, we show that commercial as-received (99.75% pure) C₆₀ source materials may coalesce during repeated thermal evaporation processes, jeopardizing such reproducibility. We find that the coalescence is due to oxygen present in the initial source powder and leads to the formation of deep states within the perovskite bandgap, resulting in a systematic decrease in solar cell performance. However, further purification (through sublimation) of the C₆₀ to 99.95% before evaporation is found t

SUBMITTER: Said AA 

PROVIDER: S-EPMC10808237 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature