Nanostructured window layer in solar cells
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United States of America Patent
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Issued Date -
Oct 6, 2016
app pub date -
Nov 12, 2013
filing date -
Nov 12, 2012
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Abstract
A solar cell has a nanostructured window layer with planar p-n junction geometry. Preferably, metal grid mesas are used to provide lateral conductance and good electrical contacts. In addition to carrier confinement and lateral conductance, this window layer can also provides a broadband angle-independent antireflection function. This structure enhances both the optical and electrical properties in a solar cell, leading to higher Jsc, Voc, FF (fill factor) and efficiency. The absorption in the window layer is partially converted to photocurrent, which to some extent compensates for the self-absorption loss due to its greater thickness. This design can eliminate the need for a separate anti-reflection coating.
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