Broad Spectral Response Using Carbon Nanotube/Organic Semiconductor/C₆₀ Photodetectors

Abstract

We demonstrate that photogenerated excitons in semiconducting carbon nanotubes (CNTs) can be efficiently dissociated by forming a planar heterojunction between CNTs wrapped in semiconducting polymers and the electron acceptor, C(60). Illumination of the CNTs at their near-infrared optical band gap results in the generation of a short-circuit photocurrent with peak external and internal quantum efficiencies of 2.3% and 44%, respectively. Using soft CNT-hybrid materials systems combining semiconducting small molecules and polymers, we have fabricated broad-band photodetectors with a specific detectivity >10(10) cm Hz(1/2) W(1-) from lambda = 400 to 1450 nm and a response time of tau = 7.2 +/- 0.2 ns.

Solution-processed hybrid perovskite photodetectors with high detectivity

“…And a built-in or applied electric field is necessary to separate the electrons and holes to produce an electric current. Various types of semiconductor materials have been applied in photodetectors, such as Si, InGaAs, ZnO, GaN, carbon nanotubes, quantum dots and conjugated polymers [1][2][3][4][5][6][7][8][9][10] . Although certain applications require different features, the key figure-of-merit parameters are responsivity (R), detectivity (D*), noise equivalent power (NEP), linear dynamic range (LDR) and response speed.…”

Enviromentaly Friendly Functionalization of Carboxylated Shortend Multi-Wall Nanotubes with Sunset Yellow Dye

“…The group attach to the surface of carbon nanotube, in order to take advantage of its outstanding mechanical, optical, solubility, electrical and thermal properties. Carbon nanotubes have unique properties that make them attractive for different engineering applications and many other fields [3][4][5][6][7] . multiwalled carbon nanotubes are more attractive than singlewalled carbon nanotubes because of their relatively low production costs and availability in large quantities.…”

Nonlocal Response in Infrared Detector with Semiconducting Carbon Nanotubes and Graphdiyne

“…In the last few decades, the purity of s‐SWNTs can reach 99.9% by several postseparation methods,8, 9, 10, 11, 12, 13 especially by conjugated polymer‐assisted selective dispersion. At the same time, p–n junctions, heterojunctions, and asymmetric electrodes have been employed to promote the dissociation of excitons 14, 15, 16, 17, 18, 19. For example, the performance of s‐SWNTs IR photodetector was improved by using fullerene (C 60 ) as an electron acceptor to dissociate excitons 14, 15, 16.…”

“…At the same time, p–n junctions, heterojunctions, and asymmetric electrodes have been employed to promote the dissociation of excitons 14, 15, 16, 17, 18, 19. For example, the performance of s‐SWNTs IR photodetector was improved by using fullerene (C 60 ) as an electron acceptor to dissociate excitons 14, 15, 16. In addition, the performance of the photodetector can also be enhanced with asymmetric electrodes, such as scandium (Sc) and palladium (Pd) showing n‐type and p‐type contact with SWNTs, respectively 17, 18.…”

“…In addition, the performance of the photodetector can also be enhanced with asymmetric electrodes, such as scandium (Sc) and palladium (Pd) showing n‐type and p‐type contact with SWNTs, respectively 17, 18. Though significant progress has been made in the dissociation of excitons, the composite materials will influence the electrical performance of the SWNTs film, for example the on‐state current and carrier mobility usually decrease 14, 15, 16, 17, 18, 19…”