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Delving Charge-Transfer Excitations in Hybrid Organic–Inorganic Hetero Junction of Dye-Sensitized Solar Cell: Assessment of Excitonic Optical Properties Using the GW and Bethe–Salpeter Green’s Function Formalisms

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Development of Solar Cells

Part of the book series: Challenges and Advances in Computational Chemistry and Physics ((COCH,volume 32))

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Abstract

First-principles modeling of charge-neutral excitations with the recognition of charge-transfer and Rydberg states and probing the mechanism of charge-carrier generation from the photoexcited electron–hole pair for the hybrid organic–inorganic photovoltaic materials remain as a cornerstone problem within the framework of time-dependent density functional theory (TDDFT) . The many-body Green’s function Bethe–Salpeter formalism based on a Dyson-like equation for the two-particle correlation function, which accounts for the exchange and attractive screened Coulomb interactions between photoexcited electrons and holes, has emerged as a decent approach to study the photoemission properties including the Frenkel and charge-transfer excitations in an assortment of finite and extended systems of optoelectronic materials. The key ideas of practical implementation of Bethe–Salpeter equation (BSE) involving the computations of single-particle states, quasi-particle energy levels, and the screened Coulomb interaction with the aid of Gaussian atomic basis sets and resolution-of-identity techniques are discussed. The work revisits the computational aspects for the evaluation of electronic, spectroscopic, and photochromic properties of the dye-sensitized solar cell (DSSC) constituents by considering the excitonic effects that renormalize the energy levels and coalesce the single-particle transitions. The most recent advancements in theoretical methods that employ the maximally localized Wannier’s function (MLWF) and curtail the overall scaling of BSE calculations are also addressed, and the viable applications are subsequently illustrated with selected examples. Finally, the review reveals some computational challenges that need to be resolved to expand the applicability of BSE in designing solar cell materials, and to unravel the intricate mechanism of ultrafast excited-state processes.

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Acknowledgements

This work has been supported by the Department of Energy (Grant number: DE-SC0018322) and the NSF EPSCoR (Grant number: OIA-1757220).

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  1. Interdisciplinary Center for Nanotoxicity, Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA

    Pabitra Narayan Samanta & Jerzy Leszczynski

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  1. Pabitra Narayan Samanta
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Correspondence to Jerzy Leszczynski .

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  1. Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Interdisciplinary Center for Nanotoxicity, Jackson, MS, USA

    Juganta K. Roy

  2. Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Interdisciplinary Center for Nanotoxicity, Jackson, MS, USA

    Supratik Kar

  3. Deparment of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Interdisciplinary Center for Nanotoxicity, Jackson, MS, USA

    Jerzy Leszczynski

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Samanta, P.N., Leszczynski, J. (2021). Delving Charge-Transfer Excitations in Hybrid Organic–Inorganic Hetero Junction of Dye-Sensitized Solar Cell: Assessment of Excitonic Optical Properties Using the GW and Bethe–Salpeter Green’s Function Formalisms. In: Roy, J.K., Kar, S., Leszczynski, J. (eds) Development of Solar Cells. Challenges and Advances in Computational Chemistry and Physics, vol 32. Springer, Cham. https://doi.org/10.1007/978-3-030-69445-6_5

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