Berlin 2018 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 17: Poster Session I
DS 17.68: Poster
Dienstag, 13. März 2018, 18:15–20:15, Poster B
Infrared Spectroscopic Study on Phosphonic Acid Modification of Nickel Oxide — •Valentina Rohnacher1,2, Sabina Hillebrandt1,2, Florian Ullrich2,3, Sebastian Hietzschold2,4, Sebastian Beck1,2, and Annemarie Pucci1,2 — 1Kirchhoff Institut für Physik, Uni Heidelberg — 2Innovationlab GmbH, Heidelberg — 3TU Darmstadt — 4TU Braunschweig
Solution-processed nickel oxide (sNiO) thin films have shown promising characteristics as hole transport material in organic photovoltaic cells (OPVs) leading to a better interfacial compatibility between the transparent conductive oxide electrode and the organic semiconductor layer. In this study, sNiO thin films have been modified by a dipolar self-assembled monolayer (SAM) of 4-cyanophenylphosphonic acid (CYNOPPA) to gain full control of the surface properties. Infrared vibrational spectroscopy gives insight into the composition of the investigated material and can be used for monitoring orientation of characteristic vibrations or functional groups. Together with photoelectron spectroscopy, contact angle measurements and OPV device characteristics, a deeper understanding of the structure-function relationship of the modified sNiO have been achieved. The results reveal that hydroxide species of the sNiO films play a crucial role for the chemisorption of SAMs on sNiO. Besides the increased work function and improved wettability, the sNiO surface has been successfully passivated by chemisorption of CYNOPPA.