Work function changes of plasma treated indium tin oxide

He, Kongduo; Yang, Xuanyu; Yan, Hang; Wu, Zhonghang; Li, Zebin; Zhong, Shaofeng; Ou, Qiongrong; Liang, Rongqing

doi:10.1016/j.orgel.2014.05.008

Cited by 20 publications

(14 citation statements)

References 27 publications

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“…Third, temperature ranges given for the presence of a particular species on the respective oxide surfaces vary by up to 100 °C, which is partially due to the different analytical methods used. Therefore, the literature data illustrated in the overview given by Figure 12 correspond to temperature ranges for which the data found for ITO, SnO 2 and In 2 O 3 show the best agreement [ 5 , 21 , 22 , 23 , 24 , 25 , 26 , 29 , 32 , 33 , 45 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 ]. The most important findings for the relevant species are summarized as follows: Oxygen The surface spectra published in literature reveal oxygen species only at temperatures of up to 500 °C.…”

Section: Results and Discussionmentioning

confidence: 96%

Evaluation of Indium Tin Oxide for Gas Sensing Applications: Adsorption/Desorption and Electrical Conductivity Studies on Powders and Thick Films

Dietrich

Kusnezoff

Petasch

et al. 2021

Sensors

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By combining results of adsorption/desorption measurements on powders and electrical conductivity studies on thick and thin films, the interaction of indium tin oxide with various ambient gas species and carbon monoxide as potential target gas was studied between room temperature and 700 °C. The results show that the indium tin oxide surfaces exhibit a significant coverage of water-related and carbonaceous adsorbates even at temperatures as high as 600 °C. Specifically carbonaceous species, which are also produced under carbon monoxide exposure, show a detrimental effect on oxygen adsorption and may impair the film’s sensitivity to a variety of target gases if the material is used in gas sensing applications. Consequently, the operating temperature of an ITO based chemoresistive carbon monoxide sensor should be selected within a range where the decomposition and desorption of these species proceeds rapidly, while the surface oxygen coverage is still high enough to provide ample species for target gas interaction.

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Section: Results and Discussionmentioning

confidence: 96%

Evaluation of Indium Tin Oxide for Gas Sensing Applications: Adsorption/Desorption and Electrical Conductivity Studies on Powders and Thick Films

Dietrich

Kusnezoff

Petasch

et al. 2021

Sensors

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“…The work functions of ITO and Al are 4.8 and 4.3 eV, respectively. It is noted that the work function of ITO after oxygen plasma treatment can be slightly increased . The presence of P3HT with a HOMO level about 5 eV served as a buffer layer, favoring the hole injection property between ITO and CT layer.…”

Section: Resultsmentioning

confidence: 99%

A Versatile Method to Enhance the Operational Current of Air-Stable Organic Gas Sensor for Monitoring of Breath Ammonia in Hemodialysis Patients

Tung²,

Yang³

et al. 2019

ACS Sens.

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Point-of-care (POC) application for monitoring of breath ammonia (BA) in hemodialysis patients have emerged as a promising non-invasive health monitoring approach. In this context, many organic gas sensors have been reported for BA detection. However, one of the major challenges for its integration with portable POC application is to achieve long lifetime and high operational current at low voltage. Herein, we propose a double active layer (DL) strategy that exploits an ultra-thin layer of Poly(3hexylthiophene-2,5-diyl) (P3HT) to serve as a work function buffer, combined with an acceptor-donor polymer Poly [[4,8-as a new sensing material. We show that the DL sensor exhibits a sustainable enhanced operational current of microampere level and a stable sensing response even with the presence of P3HT layer. This effect is carefully examined with different aspect, including vertical composition profile of DL configuration, lifetime testing on different sensing layer, morphological analysis, and the versatility of the DL strategy. Finally, we utilize the CT/P3HT-DL sensor to conduct a long-term tracing of BA concentration in two hemodialysis (HD) patients before and after HD, and correlate it with the blood urea nitrogen (BUN) levels. A good correlation coefficient of 0.96 is achieved. The result demonstrates the potential of this DL strategy to be used to integrate organic sensor in POC devices.

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“…ITO are pretreated by O 2 plasma, which contributes to improved surface polarity, increased carrier concentration, and conductance . However, increase of ITO WF is typically involved with the treatment, which makes surface modifiers reducing WF more advisable in inverted PSCs. The spectra reveal that the WF of O 2 plasma ITO decreases from 5.09 to 3.88 eV which is in agreement with previous work by Zhou et al They demonstrate that neutral amine groups on the surface of ITO contribute to the interface dipole, which cause significant decrease of WF.…”

Section: Resultsmentioning

confidence: 99%

Cathode and Anode Interlayers Based on Polymer Carbon Dots via Work Function Regulation for Efficient Polymer Solar Cells

Guo

Liu

et al. 2018

Adv Materials Inter

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In this work, the ability of tuning work function for polymer carbon dots (PCDs) is systematically studied for the first time. Their application of both cathode and anode interlayers in polymer solar cells (PSCs) is achieved. PCDs possess abundant surface functional groups, which can be modified under control. Through regulating surface groups with more electron‐donating amino (PCD‐NH2) or electron‐withdrawing carboxy (PCD‐COOH), PCDs can decrease or increase work function of electrode, respectively. Therefore, PCD‐NH2 can act as cathode interlayer while PCD‐COOH plays the role of anode interlayer in PSCs. The single material system to act as both interlayers is rarely reported previously. This can simplify the design of materials and the device fabrication process. In addition, PCDs are green, low‐cost, stable, and easily fabricated. Therefore, it is demonstrated that PCDs are promising for commercial interlayer materials in optoelectronic devices.

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Work function changes of plasma treated indium tin oxide

Cited by 20 publications

References 27 publications

Evaluation of Indium Tin Oxide for Gas Sensing Applications: Adsorption/Desorption and Electrical Conductivity Studies on Powders and Thick Films

Evaluation of Indium Tin Oxide for Gas Sensing Applications: Adsorption/Desorption and Electrical Conductivity Studies on Powders and Thick Films

A Versatile Method to Enhance the Operational Current of Air-Stable Organic Gas Sensor for Monitoring of Breath Ammonia in Hemodialysis Patients

Cathode and Anode Interlayers Based on Polymer Carbon Dots via Work Function Regulation for Efficient Polymer Solar Cells

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