Towards photoelectrochromic modulation of NIR absorption in plasmonic ITO using pentacene films

19 March 2024, Version 2
This content is a preprint and has not undergone peer review at the time of posting.


As a prototypical organic semiconductor material, pentacene is investigated in numerous electronic and optical systems for its high charge carrier mobility and attractive photophysical properties. However charge generation, transfer and collection remain a critical challenge, especially when considering hybrid structures with inorganic metal oxides as charge acceptors. Herein, pentacene molecular layers are associated with plasmonic electrochromic indium tin oxide (ITO) nanostructures so to allow them to electronically modulate their near-infrared (NIR) absorption in absence of external electric power. Multi-modal surface characterizations show that pentacene molecules transition from a perpendicular orientation when deposited on bare surfaces to more random organization, involving standing-up and face-on orientations, when deposited on ITO. Optoelectronic properties of the interfaced materials are consequently impacted, with steady-state and ultrafast transient spectroscopies further highlighting how electrons are photo-generated in pentacene and consecutively transferred into ITO, ultimately tuning its NIR optical response. Such ITO – pentacene bilayers are therefore holding promise as novel heterojunction-like photoelectrochromic structures, paving the way for the innovative design of self-powered smart windows.


inorganic metal oxides
thin film deposition
organic molecular layers
hybrid materials


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.