Color-Selective Printed Organic Photodiodes for Filterless Multichannel Visible Light Communication.

Noah Strobel,Gerardo Hernandez‐Sosa,Mervin Seiberlich,Uli Lemmer,Natalie Banerji,Rasmus R Schröder,Wolfgang Köntges,Felix Lindheimer,Manuel Pietsch,Martin Pfannmöller,Nikolaos Droseros,Stefan Schlisske

doi:10.1002/adma.201908258

Abstract

Future lightweight, flexible, and wearable electronics will employ visible-light-communication schemes to interact within indoor environments. Organic photodiodes are particularly well suited for such technologies as they enable chemically tailored optoelectronic performance and fabrication by printing techniques on thin and flexible substrates. However, previous methods have failed to address versatile functionality regarding wavelength selectivity without increasing fabrication complexity. This work introduces a general solution for printing wavelength-selective bulk-heterojunction photodetectors through engineering of the ink formulation. Nonfullerene acceptors are incorporated in a transparent polymer donor matrix to narrow and tune the response in the visible range without optical filters or light-management techniques. This approach effectively decouples the optical response from the viscoelastic ink properties, simplifying process development. A thorough morphological and spectroscopic investigation finds excellent charge-carrier dynamics enabling state-of-the-art responsivities >102 mA W-1 and cutoff frequencies >1.5 MHz. Finally, the color selectivity and high performance are demonstrated in a filterless visible-light-communication system capable of demultiplexing intermixed optical signals.

Highlights

Future lightweight, flexible, and wearable electronics will employ visible-light- relevant to upcoming techcommunication schemes to interact within indoor environments
In their to be tailored to the final application in terms of optoelectronic great majority, these optical response from diodes (OPDs) utilize active layers developed for
We present a filterless concept for inkjet-printed color-selective OPDs which exploits the selective absorption of a bulk-heterojunction (BHJ) system comprised of a transparent wide-bandgap polymer donor and nonfullerene acceptors (NFAs)

Summary

Introduction

Flexible, and wearable electronics will employ visible-light- relevant to upcoming techcommunication schemes to interact within indoor environments. The respective responsivities are comparable or even outmatch previously demonstrated color-selective photodiodes based on organic or perovskite active layers demonstrating the potential of these nonconventional BHJ systems (see Table S1 in the Supporting Information).[6] A photograph of the inkjet-printed multicolor array with “red” and “blue” OPDs is shown in the inset of Figure 1b.

Results

Conclusion