Abstract
Fluorinated perylene diimide (FPDI) was used as organic electron transport material in lead-free bismuth based perovskite solar cells fabricated by sequential vacuum vapor deposition. The influences of convenient solvent treatments and substrate temperature on the morphology and structure of methyl-ammonium bismuth (III) iodide (MA3Bi2I9) perovskite films were studied and the properties of the according solar cells were investigated. It was found that the power conversion efficiency of the device was 0.06% when the electron transport layer (ETL) of FPDI treated by solvent vapor annealing with chloroform and the substrate temperature at 75 °C. The device exhibits limited performance degradation after 17 days' storage in ambient atmosphere. The results provide the probability of utilizing FPDI as organic electron transport material in bismuth based perovskite solar cells with low toxicity and high stability.
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