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Highly absorbing and high lifetime tapered silicon microwire arrays as an alternative for thin film crystalline silicon solar cells

Yalamanchili, Sisir and Emmer, Hal S. and Lewis, Nathan S. and Atwater, Harry A. (2017) Highly absorbing and high lifetime tapered silicon microwire arrays as an alternative for thin film crystalline silicon solar cells. In: 2017 IEEE 44th Photovoltaic Specialist Conference (PVSC). IEEE , Piscataway, NJ, pp. 1-5. ISBN 978-1-5090-5605-7. https://resolver.caltech.edu/CaltechAUTHORS:20180601-141005255

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Abstract

We report cryogenic inductively coupled plasma reactive ion etching (ICPRIE) etched tapered silicon microwires are ideal light trapping structures with extremely low (1.08% between 400 nm–1100 nm under normal incidence) reflectivity. We show that these tapered microwire arrays absorb 90.12% of incident light under normal incidence in an effectively 20 μm thick silicon when embedded in a polymer and peeled off the substrate, making them an attractive alternative for achieving high efficiency in thin film crystalline silicon solar cells. We show that microwave photoconductivity decay measurements as a simple quick way to measure carrier lifetimes in etched microwires under various liquid surface passivation techniques to estimate surface recombination velocities. The etched structures demonstrate >1 μs lifetimes.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1109/PVSC.2017.8366710DOIArticle
https://ieeexplore.ieee.org/document/8366710PublisherArticle
ORCID:
AuthorORCID
Lewis, Nathan S.0000-0001-5245-0538
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2017 IEEE.
Subject Keywords:silicon, microwires, reflection, absortion, surface passivation, carrier lifetime
Record Number:CaltechAUTHORS:20180601-141005255
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180601-141005255
Official Citation:S. Yalamanchili, H. S. Emmer, N. S. Lewis and H. A. Atwater, "Highly absorbing and high lifetime tapered silicon microwire arrays as an alternative for thin film crystalline silicon solar cells," 2017 IEEE 44th Photovoltaic Specialist Conference (PVSC), Washington, DC, USA, 2017, pp. 1-5. doi: 10.1109/PVSC.2017.8366710
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86750
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Jun 2018 21:22
Last Modified:03 Oct 2019 19:47

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