A novel energy level detector for molecular semiconductors

Zhou, Xuehua; Zhang, Juansu; Bai, Guoliang; Wang, Chunhua; He, Wenxiang; Sun, Xiangnan; Zhang, Jianli; Miao, Jiaojiao

doi:10.1039/d1cp01842f

Cited by 5 publications

(1 citation statement)

References 59 publications

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“…59 More than this, the UPS spectrum consists in series of features that can be applied to extract other information, such as the higher occupied molecular orbits. 60 However, there are some disadvantages present in this technique, and they can be listed as follows. Firstly, the photo-electron emission event will lead to an electronic relaxation effect, which is accompanied by significant geometric relaxation.…”

Section: Ups Characterizationmentioning

confidence: 99%

Energy level measurement for organic semiconductors

Zhou,

Yang,

et al. 2024

Phys. Chem. Chem. Phys.

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Section: Ups Characterizationmentioning

confidence: 99%

Energy level measurement for organic semiconductors

Zhou,

Yang,

et al. 2024

Phys. Chem. Chem. Phys.

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The Effect of Organic Semiconductor Electron Affinity on Preventing Parasitic Oxidation Reactions Limiting Performance of n‐Type Organic Electrochemical Transistors

Alsufyani,

Moss,

Tait

et al. 2024

Advanced Materials

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A key challenge in the development of organic mixed ionic‐electronic conducting materials (OMIEC) for high performance electrochemical transistors is their stable performance in ambient. When operating in aqueous electrolyte, potential reactions of the electrochemically injected electrons with air and water could hinder their persistence, leading to a reduction in charge transport. Here, the impact of deepening the LUMO energy level of a series of electron‐transporting semiconducting polymers is evaluated, and subsequently rendering the most common oxidation processes of electron polarons thermodynamically unfavorable, on organic electrochemical transistors (OECTs) performance. Employing time resolved spectroelectrochemistry with three analogous polymers having varying electron affinities (EA), it is found that an EA below the thermodynamic threshold for oxidation of its electron polarons by oxygen significantly improves electron transport and lifetime in air. A polymer with a sufficiently large EA and subsequent thermodynamically unfavorable oxidation of electron polarons is reported, which is used as the semiconducting layer in an OECT, in its neutral and N‐DMBI doped form, resulting in an excellent and air‐stable OECT performance. These results show a general design methodology to avoid detrimental parasitic reactions under ambient conditions, and the benefits that arise in electrical performance.

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Photoconductance Induced by Excited‐State Intramolecular Proton Transfer (ESIPT) in Single‐Molecule Junctions

Wang,

Chen,

Lei

et al. 2024

Advanced Materials

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Excited‐state intramolecular Proton Transfer (ESIPT) molecules have been drawing considerable attention due to their unique photophysical properties and potential applications in optoelectronic devices. Although ground and excited‐state tautomerism in various proton transfer systems associated with ESIPT has been extensively studied both experimentally and theoretically, the charge‐transport characteristics of ESIPT molecules at the single‐molecule level has been little investigated. In this work, scanning tunneling microscope‐based fixed junction technique (STM‐FJ) is employed with theoretical calculations to explore the electronic properties of SMe‐PhOH (with ESIPT properties), together with its photoconductance induced by ESIPT photocycle processes under continuous light illumination (254/275/295/310 nm). The conductance variation of SMe‐PhOH with different UV wavelengths exhibits a continuous photoconductance distribution, which is highly consistent with the results of its UV–vis absorption spectrum. Theoretical calculations indicate that the interaction between localized HOMO and delocalized LUMO of SMe‐PhOH K*‐state gives rise to Fano resonance, thereby leading to enhanced conductance compared with its E‐state. It reveals the microscopic mechanism of ESIPT process at the nanoscale and provides a constructive perspective for optimizing the photoresponsive properties of ESIPT‐type molecules, as well as designing high‐performance single‐molecule devices.

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A novel energy level detector for molecular semiconductors

Abstract: The multifunction of molecule-based device is always achieved by improving the charge transport characteristics. These characteristics depend strongly on the energy levels of molecular semiconductors which fundamentally determine the working...

Cited by 5 publications

References 59 publications

Energy level measurement for organic semiconductors

Energy level measurement for organic semiconductors

The Effect of Organic Semiconductor Electron Affinity on Preventing Parasitic Oxidation Reactions Limiting Performance of n‐Type Organic Electrochemical Transistors

Photoconductance Induced by Excited‐State Intramolecular Proton Transfer (ESIPT) in Single‐Molecule Junctions

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