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.
Highlights
Until now, only two research groups have reported the conformal OPTs3,4
We present the ultrathin conformable organic phototransistor (OPT) arrays on the polyvinyl alcohol (PVA) supporting layer, in which the air-stable n-type PTCDI-C13H27 thin film serves as the active layer, polymethyl methacrylate (PMMA) serves as dielectric layer, and the thickness of the entire OPT is only~830 nm
PMMA is used as the dielectric of the transistor because its hydrophobic nature has been extensively shown to be favorable for good device stability[27,28]
Summary
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. 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 ntype PTCDI-C13H27 OPTs as the photodetection system of curved artificial compound eyes in wearable and portable electronics and optoelectronics. Of PTCDI-C13H27 in fabrication of n-type conformal OPT array, and the potential application of the devices for future wearable and portable electronics and optoelectronics
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