Exploiting supramolecular assemblies for filterless ultra-narrowband organic photodetectors with inkjet fabrication capability

Abstract

Strongly coupled dye molecules are known to produce narrowband absorption in a large spectral range. Here we exploit this feature to achieve organic photodetectors with ultra-narrow full-width at half-maximum response at low bias voltage.

Enhanced Room‐Temperature Photoluminescence Quantum Yield in Morphology Controlled J‐Aggregates

“…Highly ordered supramolecular assemblies of organic dye molecules into 1D, 2D, and 3D structures (J‐aggregates) have a long history in science and technology [ 1 ] and have recently attracted interest in the field of polariton lasers, [ 2 ] organic light‐emitting devices, [ 3 ] hybrid energy transfer systems, [ 4–6 ] narrowband photodetectors [ 7–9 ] , and emerging opto‐excitonic switches. [ 10 ] Strong coupling of transition dipole moments between dye molecules leads to specific optical properties such as narrow absorption and photoluminescence (PL) bands with small Stokes’ shift.…”

Semitransparent Layers of Social Self‐Sorting Merocyanine Dyes for Ultranarrow Bandwidth Organic Photodiodes

“…Most interestingly, the OPD at a ratio of 10:90 exhibits the highest EQE max value of 18% at the J‐band, exceeding even the 14% with a pristine 1 (Hex) donor layer (0:100). To the best of our knowledge this is the to‐date highest reported EQE max value with 18% at 750 nm with a FWHM of only 14 nm for an OPD driven at 0 V sample bias and without photo‐multiplication effects based solely on J‐aggregation to constitute a narrowband photogeneration feature, exceeding previous literature reported values of 10% at 780 nm ( FWHM = 72 nm) [ 34 ] and 16% at 756 nm ( FWHM = 125 nm). [ 35 ] Above a ratio of 50:50 the J‐band EQE then vanishes, similar as observed for the thin film in the optical absorption spectra.…”

“…[ 13 ] This progress can be ascribed to the better tunability of material properties, [ 12 ] allowing for customized optical properties including sufficient semitransparency, but also to their inherent tinctorial strength enabling light‐weight devices on flexible substrates. [ 14–16 ] Whilst panchromatic light harvesting is desired for OSCs, a particularly advantageous application of organic semiconductors are color‐selective organic photodiodes (OPDs) [ 17–19 ] which can be realized based on rational molecular design, [ 20 ] on exciton coupling and exchange narrowing of chromophores in the solid state (J‐/H‐aggregates) [ 21,22 ] and on smart device engineering approaches like charge collection narrowing [ 23–25 ] or by micro‐cavity design. [ 26,27 ] Still the major challenge is to balance the efficiency of these detectors with their respective sensitivity toward high‐performance color selective OPDs for, that is, biomedical monitoring and sensing applications with low power consumption.…”

Wavelength‐Selective Organic Photodetectors

“…Figure shows D * values extracted from 43 papers reporting narrow‐band OPDs from the year 2012 onwards with an FWHM value of a maximum of 150 nm. [ 4,17–21,25,28,30–34,38–67 ] To get an overview of the current status of the field, it is instructive to plot D * as a function of peak EQE value, J d , and design wavelength. It is important to mention that not in all of these papers the noise currents have been directly measured and D * has often been calculated using , given by Equation (2).…”