Dr. Pätzel erforscht derzeit die Kombination von organischen Halbleitern mit molekularen Fotoschaltern (insbesondere Diarylethenen) zur Entwicklung von optisch steuerbaren elektronischen Bauelementen. Im Fokus stehen optisch schaltbare Transistoren und lichtemittierende Transistoren, die durch Bestrahlung reversibel ihre elektronischen Eigenschaften ändern und damit Speicher- sowie Anzeigeelemente ermöglichen. Die Arbeiten adressieren die Anforderung neuromorpher Chips und optischer Speichersysteme, indem sie Schnittstellen zwischen Licht und Elektronik auf Materialebene gestalten. Relevante Branchen sind Optoelektronik, Speichertechnologie, Display-Technologie und neuromorphe Computersysteme.
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Dr. rer. nat. Michael Pätzel
HU-FIS-Profil ↗Förderer: Wirtschaftsunternehmen / gewerbliche Wirtschaft Zeitraum: 02/2005 - 12/2006 Projektleitung: Dr. rer. nat. Michael Pätzel
Zeitraum: 02/2006 - 12/2006 Projektleitung: Dr. rer. nat. Michael Pätzel
Zeitraum: 05/2007 - 12/2007 Projektleitung: Dr. rer. nat. Michael Pätzel
Journal of the American Chemical Society · DOI
When applying photochromic switches as functional units in light-responsive materials or devices, an often disregarded yet crucial property is their resistance to fatigue during photoisomerization. In the large family of diarylethene photoswitches, formation of an annulated isomer as a byproduct of the photochromic reaction turns out to prevent the desired high reversibility for many different derivatives. To overcome this general problem, we have synthesized and thoroughly investigated the fatigue behavior of a series of diarylethenes, varying the nature of the hetaryl moieties, the bridging units, and the substituents. By analysis of photokinetic data, a quantification of the tendency for byproduct formation in terms of quantum yields could be achieved, and a strong dependency on the electronic properties of the substituents was observed. In particular, substitution with 3,5-bis(trifluoromethyl)phenyl or 3,5-bis(pentafluorosulfanyl)phenyl groups strongly suppresses the byproduct formation and opens up a general strategy to construct highly fatigue-resistant diarylethene photochromic systems with a large structural flexibility.
Nature Chemistry · DOI
Advanced Functional Materials · DOI
Zinc oxide (ZnO) is regarded as a promising alternative material for transparent conductive electrodes in optoelectronic devices. However, ZnO suffers from poor chemical stability. ZnO also has a moderate work function (WF), which results in substantial charge injection barriers into common (organic) semiconductors that constitute the active layer in a device. Controlling and tuning the ZnO WF is therefore necessary but challenging. Here, a variety of phosphonic acid based self‐assembled monolayers (SAMs) deposited on ZnO surfaces are investigated. It is demonstrated that they allow the tuning the WF over a wide range of more than 1.5 eV, thus enabling the use of ZnO as both the hole‐injecting and electron‐injecting contact. The modified ZnO surfaces are characterized using a number of complementary techniques, demonstrating that the preparation protocol yields dense, well‐defined molecular monolayers.