Organic Semiconductor Thin Films Deposited by Resonant Infrared Matrix-Assisted Pulsed Laser Evaporation: A Fundamental Study of the Emulsion Target

Liu, Yuan‐Kai; Atewologun, Ayomide; Stiff‐Roberts, Adrienne D.

doi:10.1557/opl.2014.957

Cited by 4 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…14 Control of various process parameters has been shown to tune film morphology. For instance, MAPLE has been shown to control preferential crystal orientation and the extent of crystallinity in thin polymer films by adjusting the matrix formulation 17 and substrate temperature, 18 respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

Additive Growth and Crystallization of Polymer Films

et al. 2016

View full text Add to dashboard Cite

We demonstrated a polymeric thin film fabrication process in which molecular-scale crystallization proceeds with additive film growth, by employing an innovative vapor-assisted deposition process termed matrix-assisted pulsed laser evaporation (MAPLE). In comparison to solution-casting commonly adopted for the deposition of polymer thin films, this physical vapor deposition (PVD) methodology can prolong the time scale of film formation and allow for the manipulation of temperature during deposition. For the deposition of molecular and atomic systems, such a PVD manner has been demonstrated to facilitate molecular ordering and delicately manipulate crystalline morphology during film growth. Here, using MAPLE, we deposited thin films of a model polymer, poly(ethylene oxide) (PEO), atop a temperature-controlled substrate with an average growth rate of less than 10 nm/h. The mechanism of deposition is sequential addition of nanoscale liquid droplets. We discovered that the deposition process leads to the formation of two-dimensional (2D) PEO crystals, composed of monolamellar crystals laterally grown from larger nucleus droplets. The 2D crystalline coverage and crystal thickness of the films can be manipulated with two processing parameters, deposition time, and temperature.

show abstract

Section: ■ Introductionmentioning

confidence: 99%

Additive Growth and Crystallization of Polymer Films

et al. 2016

View full text Add to dashboard Cite

show abstract

“…The development of matrix-assisted pulsed laser evaporation (MAPLE), which provides a gentle means for the deposition of high molecular polymers from the near-gas-phase growth conditions, − offers a unique opportunity for bottom-up polymer film growth to control morphology. For instance, it has been shown that MAPLE can be used to control preferential crystal orientation and the extent of crystallinity in polymer thin films by adjusting the matrix formulation and substrate temperature, respectively. Recently, we demonstrated the sequential growth and crystallization of polymer thin films deposited via MAPLE at slow growth rates .…”

mentioning

confidence: 99%

Irreversible Adsorption Controls Crystallization in Vapor-Deposited Polymer Thin Films

Jeong

Napolitano

Arnold

et al. 2016

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

Matrix-assisted pulsed laser evaporation (MAPLE) provides a gentle means for the quasi-vapor deposition of macromolecules. It offers a unique opportunity for the bottom-up control of polymer crystallization as film growth and crystallization occur simultaneously. Surprisingly, with increasing deposition time, it has been shown that crystallization becomes prohibited despite the availability of polymer via continuous deposition. In this Letter, we investigate the molecular origins of suppressed crystallization in poly(ethylene oxide) films deposited by MAPLE atop silicon substrates. We find that suppressed crystallization results from the formation of an irreversibly adsorbed polymer nanolayer at the substrate that forms during deposition. Substrate temperature is shown to influence the stability of the irreversibly adsorbed nanolayer and, hence, polymer thin film crystallization. Our investigation offers new insight into how temperature and interfacial interactions can serve as a new toolbox to tune polymer film morphology in bottom-up deposition.

show abstract

“…Y. Liu (2014) analyzed the influence of the emulsion containing different organic solvents and various alcohols on the morphology properties of P3HT layers obtained using emulsion-based RIR-MAPLE (Er:YAG laser, λ = 2.9 µm) [144]. In the P3HT thin films deposition, a fluence of 1.46-1.6 J/cm 2 and targets prepared either from 0.5 wt.% P3HT in chlorobenzene, 1,2-dichlorobenzene, 1,2,4-trichlorobenzene, chloroform or trichloroethylene mixed with phenol and emulsified with water (1:0.5:4 ratio of emulsion components) or 0.5 wt.% P3HT in 1,2,4-trichlorobenzene mixed with phenol and emulsified with methanol, ethanol, 1-propanol or 1-butanol mixed with water (1:0.2:1:3 weight ratio of emulsion components) were used.…”

Section: Single Layers Based On Polymersmentioning

confidence: 99%

“…The vapor pressure of the solvents used as a matrix in the laser deposition is also an experimental parameter that can affect the surface properties of the deposited films. Thus, in the emulsion-based RIR-MAPLE, the low vapor pressure solvents, such as trichloroethylene or 1,2,4-trichlorobenzene, allow the deposition of films with a low roughness, preferentially with a vertical orientation of the microcrystalline domains, while the films obtained from high vapor pressure solvents are rough with a random orientation [144]. The films deposited using UV-MAPLE using low vapor pressure solvents show smoother surfaces compared to those prepared from high vapor pressure solvents [123].…”

Section: Conclusion and Challengesmentioning

confidence: 99%

Organic Thin Films Deposited by Matrix-Assisted Pulsed Laser Evaporation (MAPLE) for Photovoltaic Cell Applications: A Review

2021

View full text Add to dashboard Cite

Human society’s demand for energy has increased faster in the last few decades due to the world’s population growth and economy development. Solar power can be a part of a sustainable solution to this world’s energy need, taking into account that the cost of the renewable energy recently dropped owed to the remarkable progress achieved in the solar panels field. Thus, this inexhaustible source of energy can produce cheap and clean energy with a beneficial impact on the climate change. The considerable potential of the organic photovoltaic (OPV) cells was recently emphasized, with efficiencies exceeding 18% being achieved for OPV devices with various architectures. The challenges regarding the improvement in the OPV performance consist of the selection of the adequate raw organic compounds and manufacturing techniques, both strongly influencing the electrical parameters of the fabricated OPV devices. At the laboratory level, the solution-based techniques are used in the preparation of the active films based on polymers, while the vacuum evaporation is usually involved in the deposition of small molecule organic compounds. The major breakthrough in the OPV field was the implementation of the bulk heterojunction concept but the deposition of mixed films from the same solvent is not always possible. Therefore, this review provides a survey on the development attained in the deposition of organic layers based on small molecules compounds, oligomers and polymers using matrix-assisted pulsed laser evaporation (MAPLE)-based deposition techniques (MAPLE, RIR-MAPLE and emulsion-based RIR-MAPLE). An overview of the influence of various experimental parameters involved in these laser deposition methods on the properties of the fabricated layers is given in order to identify, in the forthcoming years, new strategies for enhancing the OPV cells performance.

show abstract

Organic Semiconductor Thin Films Deposited by Resonant Infrared Matrix-Assisted Pulsed Laser Evaporation: A Fundamental Study of the Emulsion Target

Cited by 4 publications

References 14 publications

Additive Growth and Crystallization of Polymer Films

Additive Growth and Crystallization of Polymer Films

Irreversible Adsorption Controls Crystallization in Vapor-Deposited Polymer Thin Films

Organic Thin Films Deposited by Matrix-Assisted Pulsed Laser Evaporation (MAPLE) for Photovoltaic Cell Applications: A Review

Contact Info

Product

Resources

About