Charging energy spectrum of black phosphorus quantum dots. (11th July 2017)

• Record Type: Journal Article
• Authors: Lino, M A; de Sousa, J S; da Costa, D R; Chaves, A; Pereira, J M; Farias, G A
• Is Part Of: Journal of physics. Volume 50:Number 30(2017)
• Publication Date: 2017-07-11
• Subjects: coulomb blockade -- phosphorene quantum dots -- addition energy spectrum; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/aa75e4
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: We present a theoretical study of the charging effects in single and double layer black phosphorus quantum dots (BPQDs) with lateral sizes of 2 nm and 3 nm. We demonstrate that the charging of BPQDs are able to store up to an N max electron (that depends on the lateral size and number of layers in the QD), after which structural instabilities arises. For example, 3 nm wide hydrogen-passivated single layer BPQDs can hold a maximum of 16 electrons, and an additional electron causes the expelling of hydrogen atoms from the QD borders. We also calculated the addition energy ( E A ) spectrum. For single-layer QDs with 2 and 3 nm lateral sizes, the average E A is around 0.4 eV and 0.3 eV, respectively. For double layer QDs with the same sizes, the average E A is around 0.25 eV and 0.2 eV, respectively.