Presentation Information
[9p-PB1-10]Defect Passivation of ZnO by Catechol-Containing Molecules
〇Ryohei Aizawa1, Hirochika Tanaka1,2, Yutaro Ono1,2, Yuri Hasegawa1, Masaru Takizawa3, Kouki Akaike2, Yoichi Yamada1 (1.Univ. Tsukuba, 2.AIST, 3.Ritsumeikan Univ.)
Keywords:
organic photovoltaics,NEXAFS,catechol
ZnO is used as an electron transport layer in organic photovoltaic devices(OPV); however, defects near the ZnO surface act as recombination centers and reduce power conversion efficiency. Recently, coating ZnO with catechol-containing molecules has been reported to improve the power conversion efficiency of OPVs. In this study, ZnO single crystals coated with caffeic acid, a representative catechol-containing molecule, were investigated to clarify the passivation mechanism. Photoluminescence spectroscopy suggested a reduction in oxygen-vacancy, while NEXAFS measurements indicated the coordination of catechol groups with surface Zn atoms.