1. College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China; Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China 2. College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
Recent advances in electronic and photonic devices, such as artificial skin, wearable systems, organic and inorganic light-emitting diodes, have gained considerable commercial and scientific interest in the academe and in industries. However, low-cost and high-throughput nano-manufacturing is difficult to realize with the use of traditional photolithographic processes. In this review, we summarize the status and the limitations of current nano-patterning techniques for scalable and flexible functional devices in terms of working principle, resolution, and processing speed. Finally, several remaining unsolved problems in nano-manufacturing are discussed, and future research directions are highlighted.
Photoresist or deposition with precursor or ablation of absorbent materials
Low
High 0.2 m2/s
Medium Tens or hundreds of thousands of dollars
Dot-matrix holography [19–21]
Photoresist
Medium
Medium 0.002 m2/s
Medium Tens or hundreds of thousands of dollars
Interference lithography (IL) [6,22,23]
Photoresist or deposition with precursor or direct ablation of absorbent materials
Medium
Low Minutes/wafer (determined by the interference area)
Medium Tens or hundreds of thousands of dollars
Scanning probe lithography (SPN) [24]
Material modification, removal and deposition
5 nm
Low 10-4 cm2/h
Medium Tens or hundreds of thousands of dollars
Directed self-assembly (DSA) [7,25–29]
Block copolymers
High 11 nm
Low Small areas (cm2) in hours in parallel
Extremely low No sophisticated equipment is required
Nano-imprinting Lithography [30–35]
Substrates with suitable surface energy
Depending on the mold
Extremely high 1 m2/s
Medium Tens or hundreds of thousands of dollars
Tab.1
Fig.1
Fig.2
Fig.3
Fig.4
Fig.5
Fig.6
Fig.7
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