Control over Multifunctionality in Optoelectronic Device Based on Organic Phototransistor

Abstract

Highly stable, reproducible, photosensitive organic field-effect transistors based on an n-type organic material, copper hexadecafluorophthalocyanine, and two different polymeric gate dielectrics has been reported and their performances have been compared by evaluating the surface/interface properties. The devices produced a maximum photocurrent gain (I(light)/I(dark)) of 79 at V(G) = 7 V and showed the potentiality as multifunctional optoelectronic switching applications depending upon the external pulses. The switching time of the transistor upon irradiation of light pulse, i.e., the photoswitching time of the device, was measured to be approximately 10 ms. On the basis of optical or combination of optical and electrical pulses, the electronic/optoelectronic properties of the device can be tuned efficiently. The multifunctions achieved by the single device can ensure very promising material for high density RAM and other optoelectronic applications. Furthermore, as the device geometry in the present work is not limited to rigid substrate only, it will lead to the development of flexible organic optoelectronic switch compatible with plastic substrates.

Retina‐Inspired Carbon Nitride‐Based Photonic Synapses for Selective Detection of UV Light

“…Especially in organic phototransistors, PMMA layers as gate insulators do not trap charges at the PMMA/organic semiconductor interfaces, because the molecular structure of PMMA lacks charge-trapping sites such as hydroxyl groups. [42][43][44] Thus, in the devices that did not have NT-CN films, I D immediately increased at the start of the light illumination due to photo-induced EHP in the pentacene layer, and remained constant during illumination because the trapping phenomenon was absent ( Figure S7c, Supporting Information). [44] When the light was turned off, I D instantly returned to its initial state; this is the same behavior in the CNUVS after exposure to R, G, and B light sources.…”

Recent progress in photoactive organic field-effect transistors

“…The R value was very low, around 1.5 mA W −1 . However, a fast switching speed below 10 ms was achieved [77, 78]. In this study, a poly(4-phenoxy methylstyrene) (P4PMS) was employed as a gate insulating layer.…”

A trilayer architecture for polymer photoconductors

“…[7][8][9] Meanwhile, organic photodiodes and phototransistors are drawing more and more research interests for their potential applications in light detection and signal magnification. [10][11][12][13][14][15][16][17][18] However, organic photoconductor, an equally important device for light detection, has not been extensively studied because it is very hard to improve its photocurrent. 19,20 The above-mentioned large binding energy seriously prevents exciton dissociation and promotes carrier recombination, 21,22 resulting in very small photocurrent in conventional lateral single-layer-single-material long-channel based photoconductors.…”