High Electron Mobility of Amorphous Red Phosphorus Thin Films. Issue 20 (17th April 2019)

• Record Type: Journal Article
• Authors: Amaral, Pedro E. M.; Nieman, Glen P.; Schwenk, Gregory R.; Jing, Hao; Zhang, Raymond; Cerkez, Elizabeth B.; Strongin, Daniel; Ji, Hai‐Feng
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 20(2019)
• Page Start: 6766
• Page End: 6771
• Publication Date: 2019-04-17
• Subjects: air stability -- field-effect transistor -- red phosphorus -- semiconductor -- thin film; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201902534
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Black phosphorus (BP) has been gathering great attention for its electronic and optoelectronic applications due to its high electron mobility and high I ON/OFF current switching ratio. The limitations of this material include its low synthetic yield and high cost. One alternative to BP is another type of phosphorus allotrope, red phosphorus (RP), which is much more affordable and easier to process. Although RP has been widely used in industry for hundreds of years and considered as an insulating material, in this study, we demonstrate through field‐effect transistors (FET) measurements that amorphous red phosphorus (a‐RP) films are semiconductive with a high mobility of 387 cm 2 V −1 s −1 and a current switching ratio of ≈10 3, which is comparable to the electronic characteristics previously reported for BP. The films were produced via a thermal evaporation method or a facile drop‐casting approach onto Si/SiO2 substrates. We also report a study of the oxidation process of the films over time and a method to stabilize the films via doping a‐RP with metal oxides. The doped films retain stability for one thousand I–V cycles, with no signs of degradation. Abstract : One alternative to black phosphorus (BP) is red phosphorus (RP), which is much more affordable and easier to process. Through field‐effect transistors (FET) measurements it is demonstrated that amorphous red phosphorus (a‐RP) films are semiconductive with a high mobility of 387 cm 2 V −1 s −1 and a current switching ratio of circa 10 3, which is comparable to the electronic characteristics previously reported for BP.