Highly efficient rubrene-graphene charge transfer interfaces as phototransistors in the visible regime

Abstract

Atomically thin materials such as graphene are uniquely responsive to charge transfer from adjacent materials, making them ideal charge transport layers in phototransistor devices. Effective implementation of organic semiconductors as a photoactive layer would open up a multitude of applications in biomimetic circuitry and ultra-broadband imaging but polycrystalline and amorphous thin films have shown inferior performance compared to inorganic semiconductors. Here, we utilize the long-range order in rubrene single crystals to engineer organic semiconductor-graphene phototransistors surpassing previously reported photo-gating efficiencies by one order of magnitude. Phototransistors based upon these interfaces are spectrally selective to visible wavelengths and, through photoconductive gain mechanisms, achieve responsivity as large as 10^7 A/W and a detectivity of 1.5 10^9 Jones at room temperature. These findings point towards implementing low-cost, flexible materials for amplified imaging at ultra-low light levels.

Published in Advanced Materials. Supplementary material available at http://onlinelibrary.wiley.com/doi/10.1002/adma.201702993/full

References in corpus (7)

• Review of the Low-Frequency 1/f Noise in Graphene Devices
• The trap DOS in small molecule organic semiconductors: A quantitative comparison of thin-film transistors with single crystals
• Universal Distance-Scaling of Non-radiative Energy Transfer to Graphene
• High quality monolayer graphene synthesized by resistive heating cold wall chemical vapour deposition
• Fast and Highly Sensitive Ionic Polymer Gated WS${}_2$-Graphene Photodetectors
• Steady-state photoconductivity and multi-particle interactions in rubrene single crystals
• Gate tunable spin-orbit coupling and weak antilocalization effect in an epitaxial La${}_{2/3}$Sr${}_{1/3}$MnO${}_3$ thin film

Cited by in corpus (3)

• Graphene-based light sensing: fabrication, characterisation, physical properties and performance
• Organic single crystal phototransistors: Recent approaches and achievements
• Research progress of rubrene as an excellent multifunctional organic semiconductor