Pentacene derivative has 100 times more light durability than conventional products

Pentacene derivative has 100 times more light durability than conventional products

Light instability is a major factor preventing the implementation of organic semiconductors. Researchers from Osaka Metropolitan University have shown that the ultra-fast inter-system transit of the pentacene moiety in pentacene radical bonds makes organic semiconductors more stable to light. This is the fastest inter-system transit (~10−13sec) that has been demonstrated in a purely organic matter without heavy atoms. Credit: Osaka Metropolitan University

Due to the high mobility of the holes, pentacene and its derivatives have been representative organic semiconductors and have been the subject of much research, both basic and applied. In particular, they are expected to be applied to semiconductor devices, such as field-effect transistors. In addition, organic semiconductors have the advantage of being inexpensive to produce through inkjet printing, and have low environmental impacts because they do not use metals. However, the backbone of an organic semiconductor, such as pentacene, readily reacts with oxygen molecules under visible light, resulting in a loss of beneficial properties.

A research group led by Professor Yoshio Teke of the Graduate School of Engineering, Osaka Metropolitan University, has achieved more than 100 times higher optical stability than TIPS-pentacene, a popular and commercially available pentacene derivative, by increasing the commercialization of the molecule and strengthening the π-electron coupling between the radical substituent. Lynx pentacene.

At the same time, to elucidate the mechanism of the observed photoresistance, ultrafast transient absorption measurements were performed using a femtosecond pulsed laser to elucidate the peculiar excited state dynamics of this system. Focusing on the pentacene portion of the system, they find that crossover between the system occurs at an ultrafast rate (10-13 seconds), which has not been achieved before in purely organic materials that do not contain heavy atoms. Moreover, the ultra-fast deactivation subsequent to state land It was observed to occur within about 10 years-10 Seconds.

Professor Tiki stated: “Excellent photosynthetic stability was achieved by adding a radical substituent that enhances the commercialization of molecules and strengthens π-electron coupling.” “In the future, we would like to check the performance of field effect transistor and their application as an organic semiconductor”.

The study appears in physical chemistry chemical physics.

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more information:
Nishiki Minami et al, π-Topology and ultrafast excited state dynamics of remarkably chemically stable pentacene derivatives with radical substituents, physical chemistry chemical physics (2022). DOI: 10.1039 / D2CP00683A

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