All-organic flexible heterojunction thin film photodetectors based on phthalocyanines/C60

Abstract

In modern organic photoelectric detection, a broad spectrum response is much needed. Unfortunately, it remains a huge challenge in the field of optoelectronics. In this work, a photodetector based on phthalocyanines/C60 thin film heterojunction was fabricated by in situ secondary evaporation. Most encouragingly, the device has no selectivity to the substrate and can grow well on the flexible substrate, and the performance of the device changes merely 7.27% after 104 bending cycles, which shows its stability performance. The device has the ability to detect a wide band from visible light to near infrared. The largest Ri of the device was obtained reaching up to 0.94 A W−1, with crest value D* equals to 4.7 × 1012 Jones. The all-organic heterojunction devices prepared by us have the advantages of simple preparation method, low cost, and no selectivity to the substrate, which shows a very good application potential in the fields of flexible wearable and infrared remote sensing imaging in the future.