Organic Thin-Film Heterostructured Phototransistors: Architecture Design and Application Development

Organic phototransistors (OPTs) are an important type of photodetectors in which the channel carrier density can be modulated by both electrical gating and photons and they generally offer higher photosensitivity and lower noise. In addition, organics also promise the combined merits such as ease of fabrication, low cost and flexibility. Thus, OPTs have attracted significant interests for their promising applications in wearable electronics, chemical/biomedical sensing, and imaging sensors. To achieve high-performance OPTs, it is crucial to balance the separation, transport, and recombination of photogenerated carriers. In this talk, I will demonstrate how, by designing appropriate heterostructures, the optimal carrier dynamics is realized and thus resulting in the high-performance OPTs. Different heterostructures are developed for OPTs to achieve sensitive detection of photons ranging from X-ray, UV to near-infrared.