Degradation of self-assembled monolayers in organic photovoltaic devices

Angel, Felipe A.; Lyubarskaya, Yekaterina L.; Shestopalov, Alexander A.; Tang, Ching Wan

doi:10.1016/j.orgel.2014.10.004

Cited by 7 publications

(22 citation statements)

References 24 publications

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“…This interface between these dissimilar materials requires further surface modifications to improve their performance and durability. 14,36 Numerous surface modifications have been pursued, but many of these modifications have demonstrated drawbacks that include hydrolytic damage and/or a lack of uniformity across this interface. [9][10]36 In this study, we prepared a series of monolayers derived from various alcohol reagents that include 1-octadecanol (ODA), 1H,1H,2H,2H-perfluoro-1octanol (PFOA), 1,5-pentanediol (PTdiA), and 1,10-decanediol (DCdiA) to demonstrate new types of surface modifications for ITO surfaces (Figure 1).…”

Section: Resultsmentioning

confidence: 99%

“…18 In addition, it has been shown that In-O-P bonds can be easily hydrolyzed when exposed to moisture. 14 The degradation of the ODPA coatings likely led to the dissolution of individual ODPA molecules, leaving defects within the monolayers on the ITO surfaces. According to previous studies, annealing after the formation of phosphonic based monolayers can enhance their stability by consolidating the In-O-P covalent bonds.…”

Section: Work Function Determination and Electronic Propertiesmentioning

confidence: 99%

“…These results were also consistent with the hydrolytic sensitivity of ODPA reported in the literature. 14 These changes were attributed in part to a change in the binding states of the ODPA molecules, which could result from exposure to moisture through hydrolysis of In-O-P bonds. 14 The WCA measurements further supported the findings that the electrochemical tests and their hydrolytic conditions resulted in structural changes to the silane molecules and dissolution of the phosphonic acid molecules from the ITO surfaces.…”

Section: Work Function Determination and Electronic Propertiesmentioning

confidence: 99%

“…14 These changes were attributed in part to a change in the binding states of the ODPA molecules, which could result from exposure to moisture through hydrolysis of In-O-P bonds. 14 The WCA measurements further supported the findings that the electrochemical tests and their hydrolytic conditions resulted in structural changes to the silane molecules and dissolution of the phosphonic acid molecules from the ITO surfaces. A matched-pair t-test was performed to assess the statistical significance of the observed changes in the WCA values.…”

Section: Work Function Determination and Electronic Propertiesmentioning

confidence: 99%

“…12 There are, however, a number of challenges with the use of ITO in many of these electronic applications. 11,[13][14] One challenge is that the interface between unmodified ITO and the hole transport layer (HTL) can undergo multiple forms of degradation induced by thermal, photochemical, or electrochemical processes. The resulting structural and/or compositional changes to this interface can impede the overall performance of the assembled devices.…”

Section: Introductionmentioning

confidence: 99%

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Modifying the Surface Properties of Indium Tin Oxide with Alcohol-Based Monolayers for Use in Organic Electronics

Kim

Lee

Eastcott

et al. 2018

ACS Appl. Nano Mater.

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Transparent conductive oxides serve a critical function in many devices, such as organic light emitting diodes (OLEDs) and organic photovoltaics (OPVs). To optimize the performances of these devices, it is desirable to tune the interface between the transparent conductive oxide (TCO) and the next functional layer of these devices. Self-assembled monolayers prepared from phosphonic acids and silanes are commonly used to tune the properties and performance of this interface, including its surface energy, work function, and durability. Here, we report a new form of self-assembled monolayers for modifying indium tin oxide (ITO), a standard TCO used in OLEDs and OPVs. The ITO surfaces were modified with a series of distinct alcohol reagents.Stabilities of these alcohol based monolayers were compared with modifications derived from silanes and phosphonic acids, which are commonly used in the literature and industrial processes. Work functions and surface energies of these modified substrates were determined using ultraviolet photoelectron spectroscopy and contact angle measurements. Stability of these monolayers were assessed using cyclic voltammetry, X-ray photoelectron spectroscopy, and transmission spectroscopy techniques. Based on the results of these studies, alcohol based monolayers are promising candidates to modify ITO substrates for use in OLEDs and OPVs.

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Section: Resultsmentioning

confidence: 99%

Section: Work Function Determination and Electronic Propertiesmentioning

confidence: 99%

Section: Work Function Determination and Electronic Propertiesmentioning

confidence: 99%

Section: Work Function Determination and Electronic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modifying the Surface Properties of Indium Tin Oxide with Alcohol-Based Monolayers for Use in Organic Electronics

Kim

Lee

Eastcott

et al. 2018

ACS Appl. Nano Mater.

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Self‐assembled monolayers for interface engineering in polymer solar cells

Yang³

et al. 2022

Journal of Polymer Science

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Polymer solar cell (PSC) has been developed vastly in the past decade due to the advantages of low cost, lightweight, mechanical flexibility, versatility of chemical design and synthesis, semitransparency, and solution processing. The performance and lifetime of PSCs are highly dependent on the properties of both active materials and their interfaces. The combination of the versatility of organic chemistry and the multitude of well-understood ligand-metal interactions allows self-assembled monolayers (SAMs) of organic molecules to direct control over the electronic and chemical properties at the inorganic-organic interfaces. Thus, SAMs are an attractive pathway to reconcile interfaces with tunable interface properties in PSCs. Hence, this review describes the application of SAMs in PSCs at different interfaces. First, SAMs as alternatives of traditional transporting materials to reduce the barrier at indium tin oxide (ITO)/ active layer interface due to the ability of tuning work function of ITO electrode are discussed. Second, the modifications of metal oxide by SAMs to control the electrical contacts at transporting layer/active layer interface are described. Third, tailoring the properties of the donor/acceptor interface by SAMs to improve the performance of PSCs are summarized. Finally, perspectives and challenges are pointed out for developing highly stable and highperformance PSCs by applying SAMs.

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Understanding the effect of triplet sensitizers in organic photovoltaic devices

Angel

Tang

2016

Organic Electronics

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Degradation of self-assembled monolayers in organic photovoltaic devices

Cited by 7 publications

References 24 publications

Modifying the Surface Properties of Indium Tin Oxide with Alcohol-Based Monolayers for Use in Organic Electronics

Modifying the Surface Properties of Indium Tin Oxide with Alcohol-Based Monolayers for Use in Organic Electronics

Self‐assembled monolayers for interface engineering in polymer solar cells

Understanding the effect of triplet sensitizers in organic photovoltaic devices

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