Charge Transport at Colloidal QDs/Graphene Interface for IR Light Detection

Gökhan Kara^a, Matthias Grotevent^a^,^d, Sami Bolat^c, Dominik Bachmann^a, Roman Furrer^a, Maksym Kovalenko^c^,^d, Michel Calame^a^,^b, Ivan Shorubalko^a

^aEmpa – Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Transport at Nanoscale Interfaces, Dübendorf, Switzerland, Switzerland

^bUniversity of Basel, Department of Physics and Swiss Nanoscience Institute , Basel, Switzerland, Switzerland

^cEmpa – Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Thin Films & Photovoltaics, Ueberlandstrasse 129, Dübendorf, Switzerland

^dETH – Swiss Federal Institute of Technology Zürich, Department of Chemistry and Applied Biosciences, Laboratory of Inorganic Chemistry, Switzerland, Switzerland

Online School
Proceedings of Online school on Fundamentals of Semiconductive Quantum Dots (QDsSCHOOL)

Online, Spain, 2021 May 11th - 13th

Organizers: Quinten Akkerman, Sergio Brovelli and Liberato Manna

Poster, Gökhan Kara, 015
DOI: https://doi.org/10.29363/nanoge.qdsschool.2021.015
Publication date: 30th April 2021

ePoster:

The high price of state-of-the-art III-V semiconductors is limiting infrared (IR) detection to high-end applications in industry and research. Overcoming technological limitations in fabrication, phototransistors based on colloidal quantum dots (QDs) and chemical vapor deposition (CVD) graphene promise a new generation of low-cost and sensitive IR detectors. Typically, the graphene channel is functionalized with size- and composition tunable light-absorbing QDs by spin coating, dip coating, or drop-casting. By controlled deposition of the QDs onto the active device area, inkjet printing has the potential to reduce the amount of used materials while guaranteeing a high throughput. Here, we explore the charge transport across the interface of an inkjet-printed PbS QDs film to graphene with cryogenic experiments (300K to 80K). We find a polarity change of the photo signal, mediated by surface traps on the QDs that readjust the interface energy barrier.

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