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Efficient Near-Infrared Emission from Ytterbium-Doped Lead-Free Halide Perovskites to Improve Solar Cell Efficiency.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Efficient Near-Infrared Emission from Ytterbium-Doped Lead-Free Halide Perovskites to Improve Solar Cell Efficiency./
Author:	Tran, Minh N.
Description:	1 online resource (203 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
Contained By:	Dissertations Abstracts International84-11B.
Subject:	Energy. -
Online resource:	click for full text (PQDT)
ISBN:	9798379544638

Efficient Near-Infrared Emission from Ytterbium-Doped Lead-Free Halide Perovskites to Improve Solar Cell Efficiency.
Tran, Minh N.

Efficient Near-Infrared Emission from Ytterbium-Doped Lead-Free Halide Perovskites to Improve Solar Cell Efficiency. - 1 online resource (203 pages)

Source: Dissertations Abstracts International, Volume: 84-11, Section: B.

Thesis (Ph.D.)--New York University Tandon School of Engineering, 2023.

Includes bibliographical references

Reshaping the solar spectrum entering a silicon solar cell by downconverting all ultraviolet and blue photons to near-infrared (NIR) photons can boost solar cell efficiencies and lifetimes. Ytterbium (Yb) is a well-known luminophore for solar downconversion because the Yb3+ emission via 2F5/2→2F7/2 electronic transition at 1.25 eV is close to the silicon bandgap of 1.1 eV. Typically, Yb3+ is doped into a host, which absorbs in the UVblue region of the electromagnetic spectrum. The host then transfers the absorbed energy to Yb, which emits NIR photons upon relaxation. This approach using solar spectrum shifters requires only one thin film on the cover glass to boost solar cell efficiency, which simplifies the integration, and leverages existing production lines. Unfortunately, to date, the best downconversion material for solar spectrum reshaping, Yb-doped CsPb(Cl1-xBrx)3, contains lead, a toxic element. This thesis explores bismuth-based perovskites for Yb doping and spectrum-shaping as alternative materials to those containing lead. We employed physical vapor deposition (PVD), a solvent-free technique, to synthesize and explore the structural and optical properties of undoped and Yb-doped Cs3Bi2Br9 and Cs2AgBiBr6 thin films. Optimizing the synthesis and annealing conditions, we achieved 95% UV-to-NIR light conversion efficiency in Yb-doped Cs2AgBiBr6 thin films, the highest reported value from lead-free material. We also synthesized other bismuth-based perovskites, including CsBi2Br7, Cs3BiBr6, Cs2NaBiBr6, and Cs2NaBiCl6, and filled knowledge gaps in the literature about their crystal structure, stability, and optical properties.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379544638Subjects--Topical Terms:

784773
Energy.
Subjects--Index Terms:

Solar spectrumIndex Terms--Genre/Form:

554714
Electronic books.

Efficient Near-Infrared Emission from Ytterbium-Doped Lead-Free Halide Perovskites to Improve Solar Cell Efficiency.
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