Universal three-dimensional crosslinker for all-photopatterned electronics

Abstract

All-solution processing of large-area organic electronics requires multiple steps of patterning and stacking of various device components. Here, we report the fabrication of highly integrated arrays of polymer thin-film transistors and logic gates entirely through a series of solution processes. The fabrication is done using a three-dimensional crosslinker in tetrahedral geometry containing four photocrosslinkable azide moieties, referred to as 4Bx. 4Bx can be mixed with a variety of solution-processable electronic materials (polymer semiconductors, polymer insulators, and metal nanoparticles) and generate crosslinked network under exposure to UV. Fully crosslinked network film can be formed even at an unprecedentedly small loading, which enables preserving the inherent electrical and structural characteristics of host material. Because the crosslinked electronic component layers are strongly resistant to chemical solvents, micropatterning the layers at high resolution as well as stacking the layers on top of each other by series of solution processing steps is possible.

A comprehensive nano-interpenetrating semiconducting photoresist toward all-photolithography organic electronics

“…The mobility reaches up to 1.64 cm 2 V −1 s −1 , which is the highest value of photocrosslinkable OSCs reported until now (Fig. 2E) (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31).…”

Cross-Linking of Doped Organic Semiconductor Interlayers for Organic Solar Cells: Potential and Challenges

“…27,29,32 The cross-linker used in this work comprises three azide groups instead of two to increase the cross-linking efficiency, although recently a molecule with four azides has been reported. 36,37 In addition, in one recent study, an azide has been directly attached to an n-dopant, allowing the dopant ion to be covalently anchored to a fullerene host material. 38 The working principle of the cross-linker is illustrated in Figure 1b.…”

Cross-Linking of Doped Organic Semiconductor Interlayers for Organic Solar Cells: Potential and Challenges

“…[27,29,32] The cross-linker used in this work comprises three azide groups instead of two to increase the cross-linking efficiency, although recently a molecule with four azides has been reported. [36,37] In addition, in one recent study an azide has been directly attached to an n-dopant, allowing the dopant ion to be covalently anchored to a fullerene host material. [38] The working principle of the cross-linker is illustrated in Figure 1b.…”