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Ultrathin Ta2O5 electron-selective contacts for high efficiency InP solar cells

Narangari, Parvathala Reddy, Karuturi, Siva Krishna, Wu, Yiliang, Wong-Leung, Jennifer, Vora, Kaushal, Lysevych, Mykhaylo, Wan, Yimao, Tan, Hark Hoe, Jagadish, Chennupati and Mokkapati, Sudha ORCID: 2019. Ultrathin Ta2O5 electron-selective contacts for high efficiency InP solar cells. Nanoscale 11 (15) , pp. 7497-7505. 10.1039/C8NR09932D

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Heterojunction solar cells with transition-metal-oxide-based carrier-selective contacts have been gaining considerable research interest owing to their amenability to low-cost fabrication methods and elimination of parasitic absorption and complex semiconductor doping process. In this work, we propose tantalum oxide (Ta2O5) as a novel electron-selective contact layer for photo-generated carrier separation in InP solar cells. We confirm the electron-selective properties of Ta2O5 by investigating band energetics at the InP-Ta2O5 interface using X-ray photoelectron spectroscopy. Time-resolved photoluminescence and power dependent photoluminescence reveal that the Ta2O5 inter-layer also mitigates parasitic recombination at the InP/transparent conducting oxide interface. With an 8 nm Ta2O5 layer deposited using an atomic layer deposition (ALD) system, we demonstrate a planar InP solar cell with an open circuit voltage, Voc, of 822 mV, a short circuit current density, Jsc, of 30.1 mA/cm2, and a fill factor of 0.77, resulting in an overall device efficiency of 19.1%. The Voc is the highest reported value to date for an InP heterojunction solar cells with carrier-selective contacts. The proposed Ta2O5 material may be of interest not only for other solar cell architectures including perovskite cells and organic solar cells, but also across a wide range of optoelectronics applications including solid state emitting devices, photonic crystals, planar light wave circuits etc.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Royal Society of Chemistry
ISSN: 2040-3364
Date of First Compliant Deposit: 1 April 2019
Date of Acceptance: 27 March 2019
Last Modified: 15 Nov 2023 06:55

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