Abstract
Materials design for the next generation of solar cell technologies requires an efficient and cost-effective research approach to supplement experimental efforts. Computational research offers a theoretical guide by applying cutting edge methodologies to the study of electronic structures of newly predicted materials. In this chapter, we present our recent research efforts on sulfides. First, we will also provide a brief overview of oxide-based photovoltaic materials. We have conducted a density functional theory (DFT) study of two sulfide systems: acanthite Cu2S and S-doped triclinic CuBiW2O8. With these two systems, we will demonstrate both the cation and anion doping mechanisms. In Cu2S, we investigate the effects of various cation doping in Cu sites, namely Zn, Sn, Bi, Nb, and Ta and contrast their electronic structures with that of a previously studied Ag-doped Cu2S system. A subsequent charge analysis provides a correlation between dopant charge states and detrimental mid-gap trap state concentrations. We then present our best dopant choice for Cu2S-based photovoltaic systems. Finally, for CuBiW2O8, a new experimentally verified DFT-predicted quaternary oxide, the effects of S-anion-doping in O sites are studied, and results indicate favorable photovoltaic properties. This highlights the potential of S-anion-doping as a mechanism for engineering suitable band gaps for solar cell applications.
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Acknowledgements
All computations were performed on Texas Advanced Computing Center (TACC) servers. We acknowledge Dr. Pranab Sarker for the discovery of the new triclinic ground state of CBTO. This work was partially funded by NSF grant# 1609811.
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Bainglass, E., Barman, S.K., Huda, M.N. (2020). Photovoltaic Materials Design by Computational Studies: Metal Sulfides. In: Sharma, S., Ali, K. (eds) Solar Cells. Springer, Cham. https://doi.org/10.1007/978-3-030-36354-3_5
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