Influence of phonon-assisted tunneling on photovoltaic properties of BaSi2 and BaGe2 p–n homojunction solar cell devices

Mamindla, Ramesh and Niranjan, Manish K (2022) Influence of phonon-assisted tunneling on photovoltaic properties of BaSi2 and BaGe2 p–n homojunction solar cell devices. Journal of Applied Physics, 131 (18). pp. 1-12. ISSN 0021-8979

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Abstract

The solar cell properties of crystalline BaSi2 and BaGe2 p-n homojunctions are explored using density functional theory combined with a nonequilibrium Green function method. In particular, the quantitative estimates of solar cell parameters such as photocurrent, open-circuit voltage (V o c), short-circuit current (| J s c |), and efficiency (η) are obtained for LDA and GGA-1/2 functionals. The effect of temperature on solar cell parameters is included through electron-phonon coupling (EPC) using the special thermal displacements method. The magnitudes of J s c, V o c, and η for BaSi2 (BaGe2) at 300 K are found to be 27.35 mA/cm2 (26.1 mA/cm2), 0.84 V (0.78 V), and 18.0% (16.6%), respectively. Our study strongly suggests that the phonon-assisted photon absorption and thereby EPC significantly affect the photocurrent, and its inclusion is necessary for a proper description of various solar cell parameters. The computed solar cell parameters for BaSi2 (BaGe2) p-n homojunctions can be used as benchmark ab-initio quantum mechanical results and can be used in simulations based on continuum models. © 2022 Author(s).

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IITH Creators:

IITH Creators	ORCiD
Niranjan, Manish K	https://orcid.org/0000-0002-4417-5107

Item Type:

Article

Additional Information:

The authors gratefully acknowledge the support from computational facilities provided by DST-FIST(SR/FST/PSI-215/2016).

Uncontrolled Keywords:

Density-functional-theory; Non-equilibrium Green functions method; Open-circuit voltages; P/n homojunctions; Phonon assisted tunneling; Photovoltaic property; Quantitative estimates; Solar cell devices; Solar cell parameters

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

27 Jun 2022 09:20

Last Modified:

01 Jul 2022 09:27

URI:

http://raiithold.iith.ac.in/id/eprint/9410