Bioderived establishment of three-dimensional type-I Ag2S/ZnIn2S4 heterojunction for high-efficacy organic photoelectrochemical transistor biomolecular detection

Signal Modulation Induced by a Hole Transfer Layer Participant Photoactive Gate: A Highly Sensitive Organic Photoelectrochemical Transistor Sensing Platform

“…This compensatory doping ultimately led to a decrease in the density of holes in the channel and a decrease in the conductivity, as the mobile holes were not able to be replenished (Figure Gb). As shown in Figure Gc, the greatly enhanced V photo of the sample doped with S-MXene compared with that of the CdZnS accelerated the injection of a large number of cations into the channel polymer to compensate for the PSS – anions, generating a large amount of PEDOT 0 , at which point the conductivity decreased substantially …”

“…47 Because of the enhancement of V C−E , the electrochemical dedoping effect of cations in the electrolyte on the PEDOT:PSS channel was enhanced correspondingly. 48 The effect mentioned above can be further explained from a microscopic perspective. As shown in Figure 4G, the PEDOT was a P-type semiconductor, and the carriers were holes compensated for by PSS − anions.…”

Research Progress of Biosensor Based on Organic Photoelectrochemical Transistor

“…An emerging OPECT biosensor integrates interdisciplinary research on photoelectric devices and biosensing, and has been widely used in immunosensor events. As shown in Figure 11, Zhu et al 77 using the biological derivative of type I Ag 2 S/ ZnIn 2 S 4 heterojunction as the photosensitive gate electrode material can be used to develop an optical fuel OPECT biosensor with zero gate bias suitable for IgG biological target detection. The sandwich immune complex of IgG labeled with Ag nanoparticles (Ag NPs) induces the formation of ZnIn 2 S 4 into a type-I Ag 2 S/ZnIn 2 S 4 heterojunction through the release of Ag + via acid hydrolysis.…”

“…A OPECT biosensor based on type I Ag 2 S/ZnIn 2 S 4 heterojunction with zero gate bias suitable for IgG biological target detection. Reproduced or adapted with permission from ref . Copyright 2023 Elsevier.…”

Signal Modulation of Organic Photoelectrochemical Transistor by a Z-Scheme Photocathodic Gate: An Innovative Dual Amplification Strategy for Sensitive Aptasensing Application

“…Organic electrochemical transistor (OECT), on the basis of the modulated channel conductivity by the ionic injection from the electrolyte, is especially desirable due to its advantages, including excellent environmental stability, being conducive to miniaturization, and especially, an extremely high signal amplification ability. − Generally, the extra input gate bias potential ( V G ) is essential during the OECT process, which is disadvantageous for reducing power consumption . Inspired by the conversion of the noninvasive and clean stimulus of light to the electricity energy in the PEC process, several organic photoelectrochemical transistor (OPECT) sensors have been proposed by the combination of OECT and PEC strategies. − In the OPECT process, the light-induced voltage could not only principally save the power supply to make the device simplified but also permit the zero-gate-biased operation for its promising applications. − For instance, Wang’s group fabricated an OPECT sensor with zero gating voltage based on poly­(3,4-ethylenedioxythiophene) doped with poly­(styrenesulfonate) (PEDOT/PSS) channel and Fe-metal organic framework@PEDOT (Fe-MOF@PEDOT) photogate, which exhibited a 100-fold enhanced channel signal; as a result, the OPECT sensor had a better sensitivity than the general PEC method for target detection . Due to the amplification capability of the OPECT device composed by a UiO-66-NH 2 /CdS quantum dots (QDs) gate and a PEDOT/PSS channel, Gao et al constructed an efficient OPECT sensor for microRNA-166a detection with a low limit of detection (LOD) of 1.0 fM, which was 1 order of magnitude lower than the common PEC sensors under the same conditions .…”