Layer‐by‐Layer Assembly of Multilayer Thin Films for Organic Optoelectronic Devices

Abstract

Organic optoelectronic devices based on conjugated polymers have attracted widespread attention and practical applications have been achieved. Various solution‐processing protocols for depositing conjugated polymeric thin films of organic optoelectronic devices have been developed. As a low‐cost solution‐processing technique, the layer‐by‐layer (LbL) assembly method can be used to fabricate multilayer thin films with a high‐quality surface and controlled thickness. Recent remarkable progress in LbL‐assembled multilayer films for the interface engineering of organic optoelectronic devices has demonstrated their great potential for practical applications in the near future. Here, the application of LbL assembly to the construction of multilayer films is discussed for use in polymer optoelectronic devices, especially polymer light‐emitting diodes (PLEDs) and polymer solar cells (PSCs). A brief introduction to LbL‐assembled multilayer films for the emissive/active layers in PLEDs/PSCs is provided and the limitations of LbL materials are discussed. The comprehensive application of LbL‐assembly techniques and LbL materials in the interface engineering of PLEDs and PSCs is also presented with a supplementary discussion of the working mechanism of LbL materials in PLEDs and PSCs. Finally, perspectives on the LbL‐assembly technique and challenges to its application in future organic optoelectronic devices are presented.

Self‐Assembled Carbohydrate Polymers for Food Applications: A Review

“…On the other hand, new knowledge about films is oriented to the manufactured materials, using bottom-up molecular or supramolecular assembly techniques, such as L-b-L (Guzmán, Mateos-Maroto, Ruano, Ortega, & Rubio, 2017). The L-b-L technique leads to the gradual growth of films with a very low thickness, which implies the cyclic adsorption of opposite chargematerials onto specific biopolymer (Hu, Huang, & Cao, 2017). Therefore, a multilayer thin film with a molecular level of thickness and composition control can be considered very convenient to build food (Kim, Hong, & Oh, 2018;Li, Zhu, & Yang, 2012;Richardson et al, 2016).…”

[1]Benzothieno[3,2-b]benzothiophene (BTBT) derivatives: Influence in the molecular orientation and charge delocalization dynamics

“…Some of the advantages that they offer are low cost of production and deposition in flexible substrates. Currently several research groups dedicate their studies to the optimization of the structure of organic compounds for use in the construction of optoelectronic devices [1][2][3][4][5].…”

Organic Thermoelectric Multilayers with High Stretchiness

“…Layer-by-layer (LbL) assembly is a simple, but powerful technique to fabricate multifunctional thin films via cyclical adsorption of oppositely charged species. The prominent advantages of the LbL method include simplicity, versatility, and precise controllability for the creation of multilayer thin films [27]. Furthermore, by varying processing conditions (such as ionic strength, pH, types of polyelectrolytes, molecular weight, and temperature) during polyelectrolyte deposition, the physicochemical properties and morphology of multilayers can be simply controlled [28][29][30].…”