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- Title
Voltage-switchable photocurrents in single-walled carbon nanotube-silicon junctions for analog and digital optoelectronics.
- Authors
Kim, Young Lae; Jung, Hyun Young; Park, Sora; Li, Bo; Liu, Fangze; Hao, Ji; Kwon, Young-Kyun; Jung, Yung Joon; Kar, Swastik
- Abstract
Recent progress in silicon photonics has dramatically advanced the possible realization of heterogeneous logic circuits. A variety of Boolean optoelectronic circuits have been proposed. In this context, experimental investigation of logic operations with both optical and electrical inputs in chip-integrable devices is highly desirable. Here, we present a new kind of photodiode-based logic device using scalable heterojunctions of carbon nanotubes and silicon, the output currents of which can be manipulated completely by both optical and electrical inputs. This provides a novel platform for heterogeneous optoelectronic logic elements with voltage-switchable photocurrent responsivity of >1 A W−1, photovoltage responsivity of >1 × 105 V W−1, electrical on/off ratios of >1 × 105 and optical on/off ratios of >1 × 104. To demonstrate their scalability, we fabricated a large array of photoactive elements on a centimetre-scale wafer. We also present bidirectional phototransistors and novel clock-triggerable logic elements such as a mixed optoelectronic AND gate, a 2-bit optoelectronic ADDER/OR gate and a 4-bit optoelectronic digital-to-analog converter.
- Subjects
OPTOELECTRONICS; SILICON; PHOTONICS; CARBON nanotubes; PHOTOTRANSISTORS; PHOTOCURRENTS
- Publication
Nature Photonics, 2014, Vol 8, Issue 3, p239
- ISSN
1749-4885
- Publication type
Article
- DOI
10.1038/nphoton.2014.1