The mechanism of photogenerated minority carrier movement in organic phototransistors

Abstract

The acceptor phase, which affects the free carrier transport by trapping the photogenerated minority carrier in the active layer, plays an important role in organic phototransistors (OPT) based on bulk...

Space charge and active-layer capacitance of bulk heterojunction-based phototransistors

“…Organic phototransistors (OPTs) have attracted increasing attention in various fields such as image sensing, night vision, medicine, thermal efficiency analysis and environmental monitoring. [1][2][3][4] OPTs, which have an additional gate voltage compared with photodiodes and photoconductors, are one of the typical device topologies. 5 The OPT exhibits high sensitivity, ultra-high gain, and low noise and has active matrix driving features, enabling OPT integration into various optoelectronic circuits/devices.…”

The Impact of Benzothiadiazole on the Optoelectronic Performance of Polymer/PC71BM Blend Films and Their Application in NIR Phototransistors

“…Photo response of OTFTs based on polymer single component was almost negligible, and P1 even exhibited negative light response, expressing that some holes were recombined by the traps or electrons generated upon light irradiation (Figure S12, Supporting Information). [ 26 ] The addition of very small amount of PC 71 BM (weight fraction: 10%) could make great change to the photo response performance of NIR phototransistors (Figure S13, Supporting Information). P–n junction is essential for the fabrication of NIR phototransistors, as it could provide driving force for exciton dissociation.…”

Tunable Photoelectric Properties of n‐Type Semiconducting Polymer:Small Molecule Blends for Red Light Sensing Phototransistors

“…Fullerene derivatives are dominantly selected as the electron acceptors, while many electron donors are available for photodetection layer assembling. [28][29][30][31][32][33][34][35][36][37] However, the fullerenes suffer from insufficient red light absorption, due to their wide Semiconducting blend heterostructures, composed of conjugated polymer with photoresponsive organic crystals, provide an effective way to achieve promising photodetection devices. Here, solution-processed n-type N2200 conjugated polymer and quinoidal thienoisoindigo (TIIQ) small molecule blend is used to construct phototransistors for red light detection.…”

“…Fullerene derivatives are dominantly selected as the electron acceptors, while many electron donors are available for photodetection layer assembling. [ 28–37 ] However, the fullerenes suffer from insufficient red light absorption, due to their wide bandgap and morphological instability. [ 38,39 ] Nam et al.…”