Enhanced Device Absorption Efficiency and Photocatalytic Response of Monolayer PtX2 (X = S, Se, Te) for Photocatalysis and Solar Cell Applications

Author:

Waheed Hafiza Sumaira1,Ullah Hamid1ORCID,Shin Young-Han2,Alanazi Yousef Mohammed3

Affiliation:

1. Department of Physics RIPHAH International University Campus Lahore 55150 Pakistan

2. Multiscale Materials Modeling Laboratory Department of Physics University of Ulsan Ulsan 44610 Republic of Korea

3. College of Engineering Chemical Engineering Department King Saud University Riyadh Saudi Arabia

Abstract

Using density functional theory, the electronic and optical properties of monolayer platinum dichalcogenides (PtX2) are calculated. It is observed that PtS2, PtSe2, and PtTe2 have indirect bandgap of 2.70, 1.94, and 0.82 eV, respectively, indicating their potential in light harvesting. According to the calculated absorption spectra, PtX2 (X = S, Se, Te) absorbs the light extremely well in the visible range (300–700 nm), implying potential as third‐generation solar absorber in tandem configuration. The calculated device absorption efficiency increases above 90% at smaller wavelengths (300–350 nm). As a result, strong absorption across the entire light spectrum, from visible to UV, is exhibited. Interestingly, the top cell in tandem architecture requires a wider bandgap and strong device absorption efficiency, and these conditions are perfectly fulfilled by the materials PtS2 and PtSe2. The narrower gap (0.82 eV) and strong absorption of PtTe2 make it an excellent candidate for bottom cell in tandem architecture. Furthermore, it is observed that PtX2 family is useful for oxidizing H2O into O2 but fails to reduce H+ to H2. Thus, suitable bandgap, photocatalytic property for splitting water, and strong absorption efficiency make PtX2 an efficient candidate for application in optoelectronic devices, photocatalysis, and solar cells.

Funder

King Saud University

Publisher

Wiley

Subject

Condensed Matter Physics,Electronic, Optical and Magnetic Materials

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