High performance phototransistors based on single crystalline perylene-tetracarboxylic-dianhydride nanoparticle

Abstract

Organic semiconducting devices suffer from grain boundary scattering, which can be responsible for low mobility and even mask intrinsic transport properties. In this letter, we show that devices containing only single grains give electron mobility 2-3 orders higher than that of conventional film-structured polycrystalline organic semiconductor transistors. The devices contain single perylene-tetracarboxylic-dianhydride nanoparticles embedded inside gated-nanopore structures. Since there is no inter-grain scattering, we obtain the highest reported electron mobility values of 0.08 cm 2 /Vs at 300 K and 0.5 cm 2 /Vs at 80 K. Consequently, the devices, when illuminated with ultraviolet, also yield a previously unrecorded high value of external quantum efficiency of 3.5 Â 10 6. V

Infrared vibrational nanocrystallography and nanoimaging

“…PTCDA has attracted interest in organic electronics because of its high charge carrier mobility, crystallinity, and chemical stability ( 20 ). Good device performance can be obtained from high-purity thin films with well-ordered morphology and large crystalline domains, typically forming in one of two polymorphs, α or β, with both monoclinic structures containing stacked sheets of PTCDA arranged in a herringbone pattern, as shown in Fig.…”

Organic photodetectors based on supramolecular nanostructures

“…To fabricate planar phototransistor based on highly crystalline OSCs, perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) nanoparticles with diameters of 80 nm were deposited onto 30-nm-thick silicon nitride (Si 3 N 4 ) membrane through thermal evaporation. 47 SAED provided evidence for the single-crystalline nature of these PTCDA nanoparticles. Novel nanoparticle-based phototransistors were constructed by growing PTCDA nanoparticles inside bowl-shaped pores on Si 3 N 4 and depositing volcano-shaped Al gate electrodes with Al 2 O 3 insulating layers.…”

“…To fabricate planar phototransistor based on highly crystalline OSCs, perylene‐3,4,9,10‐tetracarboxylic dianhydride (PTCDA) nanoparticles with diameters of ~80 nm were deposited onto 30‐nm‐thick silicon nitride (Si 3 N 4 ) membrane through thermal evaporation 47 . SAED provided evidence for the single‐crystalline nature of these PTCDA nanoparticles.…”

Towards high efficiency thin film solar cells

“…In Fig. 31 In organic solar cells, the diffusion length is usually short, around 10 nm, [158][159][160][161][162][163] which is too thin for effective absorption to take place (typically at least 100 nm thick absorption layer is needed). The way to overcome the short diffusion length problem is to use bulk heterojunction, i.e., organic acceptor and donor molecules or polymers are mixed to form a blend of heterojunctions with fine grains [164][165][166].…”