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

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.