[19a-P5-1~38] 12.5 Organic solar cells

▼ [19a-P5-21] Moisture and Oxygen Induced Enhancement of the Conductivity in LiTFSI Doped spiro-OMeTAD films

〇(D)Zafer Hawash¹, Luis Ono¹, Yabing Qi¹ (1.OIST graduate Univ.)

Keywords:photoelectron spectroscopy,hole transport layer

Thin films of spiro-OMeTAD doped by LiTFSI were studied under controlled environments of H₂O vapor, O₂ and ambient air using current-voltage (I-V) measurements, x-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS). I-V measurements show that exposing the LiTFSI doped films to H₂O vapor leads to irreversible increased conductivity, whereas the O₂ exposed films show reversible enhanced conductivity. XPS results show that H₂O is the constituent component in ambient air that makes the LiTFSI dopants to re-distribute across the spiro-OMeTAD films.