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23-02-2018 | Electronic materials | Issue 11/2018

Journal of Materials Science 11/2018

Single layer of carbon phosphide as an efficient material for optoelectronic devices

Journal:
Journal of Materials Science > Issue 11/2018
Authors:
Deobrat Singh, Shivam Kansara, Sanjeev K. Gupta, Yogesh Sonvane
Important notes

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s10853-018-2126-6) contains supplementary material, which is available to authorized users.

Abstract

Recently, a single layer of carbon phosphide allotropes were theoretically investigated and show finite energy band gap and high carrier mobility to attract rapidly growing interests. Here, we study the structural, electronic and optical properties of single-layer carbon phosphide (CP) allotropes (α-, β- and γ-phases) based on density functional theory. The thermoelectric properties like electrical conductivity, thermal conductivity, thermoelectric power, figure of merit (ZT) and compatibility factor as a function of temperature are calculated by using BoltzTrap code. The electronic band structures reveal the direct band gap of α- and β-CP monolayer (i.e., semiconducting nature), while γ-CP monolayer is semimetallic with Dirac fermions. The significant absorption is observed in α-, β- and γ-CP monolayer, which can be used as an ultraviolet–optical–nanodevice, and all three phases of monolayer of CP are directionally transparent. The transmission spectrum of monolayer of β- and γ-phase in the visible region is much higher; therefore, it is used in an anti-reflecting layer in solar cell also. The α-phase of CP monolayer in the ZT increases linearly up to 1500 K, and beyond it reached maximum values as compared to other phases. The results show that below 550 K, CP allotropes (both n- and p-types) are hitherto the best-promising thermoelectric materials. These theoretical investigations suggest that the different phases of semiconducting materials of CP are better candidate for potential application in micro-/nanoscale device, photovoltaic and optoelectronics.

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