Fully Integrated Microscale Quasi‐2D Crystalline Molecular Field‐Effect Transistors

Abstract

Monolithic integration of microscale organic field-effect transistors (micro-OFETs) is the only and inevitable path toward low-cost large-area electronics and displays. However, to date, such an ultimate technology has not yet evolved due to challenges in positioning and patterning highly crystalline microscale molecular layers as well as in developing micrometer scale integration schemes. In this work, by mastering the local growth of molecular semiconductors on pre-defined terraces, single-crystal quasi-2D molecular layers tens of square micrometers in size are created in dense periodic arrays on a Si substrate. Nondestructive photolithographic processes are developed to pattern micro-OFETs with mobilities up to 34.6 cm 2 V −1 s −1 . This work demonstrates the feasibility to integrate arrays of short-channel micro-OFETs into electronic circuitry by highly parallel and size scalable fabrication technologies.

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

“…To address this issue, all-photolithography process holds great promise for further miniaturization of organic electronics. It patterns organic semiconductors (OSCs), dielectrics, and conductors with higher resolution, reliability, as well as compatibility to current microelectronic manufacturing industry (8)(9)(10). However, in the present, there still lacks an OSC that is deeply compatible with the all-photolithography process (11,12).…”

On-chip integrated process-programmable sub-10 nm thick molecular devices switching between photomultiplication and memristive behaviour

“…Tuning the barrier through doping near the contacts ( , where ω and N D are the barrier width and dopant density, respectively 59 ) is a standard practice in field-effect transistors (electronic doping) 60 and light-emitting electrochemical cells (ionic doping) 61 . For the nanoscale molecular devices in this work, the memristive phenomenon is attributed to the ionic doping induced by ion polarization, while the photomultiplication effect realized by photogenerated-carrier trapping can be regarded as the result of electronic doping, both of which can reduce the barrier widths for carrier injection, as shown in Fig.…”

Homogeneously Oriented Organic Single‐Crystalline Patterns Grown by Microspacing In‐Air Sublimation

“…[ 6,7 ] However, due to the poor controllability of the crystallization process for the large‐conjugated molecules, the prepared organic semiconductor crystals often suffer from random location, limited and ununiform crystal size, and disordered crystallographic orientation arrangement, which impede the subsequent device construction on them. [ 8–13 ]…”

“…[6,7] However, due to the poor controllability of the crystallization process for the large-conjugated molecules, the prepared organic semiconductor crystals often suffer from random location, limited and ununiform crystal size, and disordered crystallographic orientation arrangement, which impede the subsequent device construction on them. [8][9][10][11][12][13] Compared with the preparation of continuous crystalline films of organic semiconductors, the essential points to grow discrete single-crystalline patterns are to align the crystallographic orientation among the patterns besides controlling their deposition locations. Because the intermolecular packing mode differs along different directions in the anisotropic single crystals, the carrier transporting channels have intrinsic dependence on the crystallographic orientation.…”