High-Performance Ambipolar Organic Phototransistors Based on Core–Shell p–n Junction Organic Single Crystals

Abstract

Electronic devices based on organic single-crystal semiconductors have been used in a range of applications, suggesting their possible use as core components of high-performance electronic devices. Various electronic devices based on unipolar organic semiconducting crystals have high electrical and optoelectronic properties compared to thin-film-based devices due to the intrinsic nature of the single crystal, such as a long-range order and a high degree of structural perfection. However, only a few studies have examined electronic devices using organic single crystals with ambipolar characteristics. This study investigated the electrical and optoelectronic characteristics of a core–shell organic semiconducting crystal composed of an n-type single-crystal nanowire as the core and p-type single crystal as the shell. The device showed ambipolar behavior with balanced electron and hole mobilities (maximum electron and hole mobility of the core–shell ambipolar crystal; 1.41 × 10–1 and 8.31 × 10–2 cm2 V–1 s–1, ...