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Graduate Student Seminar - 11/13/2015

"Cellulose Paper for Advanced Photovoltaic Coatings"

by Dongheon Ha

Friday, November 13, 2015 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Assistant Professor Jeremy Munday

A new paper-based anti-reflection coating for solar cells is presented showing a large reduction in the reflection over the entire solar spectrum for a wide range of angles. This process is simple and inexpensive, requiring no high temperature or vacuum-based processing, and is made from renewable cellulose fibers. In order to absorb a significant fraction of the incident solar irradiation, a photovoltaic device must incorporate light management techniques. Mechanisms are needed for both incoupling of the light into the device and for ensuring absorption of light that has entered the cell. Here we describe coatings based on an environmentally friendly paper that act as both an anti-reflection coating and an optical scattering structure, which is able to couple light efficiently into the solar cell. We study the effect of this paper-based coating on planar GaAs and Si solar cells as well as textured Si solar cells [1-2]. We find experimentally that a paper-based anti-reflection coating can improve a commerical GaAs cell by 24% and displays angle and wavelength independent behavior over the entire solar spectrum.

  1. Dongheon Ha, Zhiqiang Fang, Liangbing Hu, and Jeremy N. Munday, Adv. Energy Mater. 4: 1301802 (2015).
  2. Dongheon Ha, Joseph Murray, Zhiqiang Fang, Liangbing Hu, and Jeremy N. Munday, IEEE J. PV 5,577-583 )2015).

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