Ultrathin Air-Stable n-Type Organic Phototransistor Array for Conformal Optoelectronics

Abstract

Development of conformal n-channel organic phototransistor (OPT) array is urgent for future applications of organic complementary circuits in portable and wearable electronics and optoelectronics. In this work, the ultrathin conformal OPT array based on air-stable n-type PTCDI-C13H27 was fabricated. The OPT array shows excellent electrical and photoelectrical performance, good device uniformity, and remains stable in electron mobility by 83% after 90 days compared to the initial values. Eventhough mobility, on-state current, off-state current, and photocurrent of PTCDI-C13H27 thin film phototransistor show slight decrease with the decreased bending radius, the device still remains the stable photosensitivity as high as 104 when the device is freely adhered on the 2D surfaces and 3D hemispherical sphere, which is in a class with the highest photosensitivity for perylene diimide derivatives. These results present the promising application potential of our conformable air-stable n-type PTCDI-C13H27 OPTs as the photodetection system of curved artificial compound eyes in wearable and portable electronics and optoelectronics.

Silylethynyl Substitution for Preventing Aggregate Formation in Perylene Diimides

“…Of particular usefulness in applications are their high absorption coefficients (ε > 10 4 M –1 cm –1 ) in the visible region, strong electron affinities, high electron mobilities, and photoluminescence quantum yields (PLQYs or Φ, typically near 100%). PDIs also frequently exhibit excellent optical, thermal, and electronic stability. − Combined with their n-type charge transport characteristics and singlet emission, PDIs are commonly applied in organic or perovskite solar cells, organic light-emitting diodes (OLEDs), and organic transistors. − Due to their large and chemically tuneable ε in the blue-green region (400–550 nm), they can also be used to obtain white light with downconverters ,, for lighting applications or in organic luminescent solar concentrators − for hybrid photonic devices.…”

Near‐Infrared Organic Phototransistors with p‐Channel Photosensitive Layers of Conjugated Polymer Composed of bis‐Octyldodecyl‐Diketopyrrolopyrrole and Benzothiadiazole Units

“…Organic phototransistors (OPTRs) have been consistently spotlighted as one of the strong candidates for futuristic photodetectors that require ultrathin, lightweight, bendable, and flexible features. [ 1–5 ] Thanks to the three‐electrode geometry, OPTRs benefit both active matrix sensing and signal amplification, so that they can be used for viable 2D‐sensing arrays without additional transistor components. [ 6–9 ] Compared to conventional inorganic phototransistors, the OPTRs based on conjugated polymers have an advantage of low‐cost fabrications by cost‐effective continuous roll‐to‐roll processes at low (room) temperatures.…”

“…Organic phototransistors (OPTRs) have been consistently spotlighted as one of the strong candidates for futuristic photodetectors that require ultrathin, lightweight, bendable, and flexible features. [1][2][3][4][5] Thanks to the three-electrode geometry, OPTRs benefit both active matrix sensing and signal amplification, so was mixed with poly(3-hexylthiophene) (P3HT), which delivered stable OFET performances, and played merely a sensing component role in the OPTRs. [36] Another approach has been demonstrated by applying the PEHTPPD-BT polymer as a gatesensing layer (GSL).…”

Role of Junctionless Mode in Improving the Photosensitivity of Sub-10 nm Carbon Nanotube/Nanoribbon Field-Effect Phototransistors: Quantum Simulation, Performance Assessment, and Comparison

“…It is worth noting that the main benefits of junctionless FETs are the simplification of fabrication on one hand and the improvement in subthreshold behavior on the other hand [ 38 , 39 , 40 ]. From the fabrication point of view, the production of an array configuration of such nanodevices is expected to be profitable since the elementary devices can be manufactured identically [ 41 ], because no junctions and no doping concentration gradients are needed [ 29 , 38 ]. Table 1 shows the physical, dimensional, and electrical parameters of the nanoscale carbon-based phototransistors under investigation.…”