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Thermal emissivity of silicon heterojunction solar cells

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Title: Thermal emissivity of silicon heterojunction solar cells
Authors: Alonso Alvarez, D
Augusto, A
Pearce, P
Ferre Llin, L
Mellor, A
Bowden, S
Paul, D
Ekins-Daukes, N
Item Type: Journal Article
Abstract: The aim of this work is to evaluate whether silicon heterojunction solar cells, lacking highly emissive, heavily doped silicon layers, could be better candidates for hybrid photovoltaic thermal collectors than standard aluminium-diffused back contact solar cells. To this end, the near and mid infrared emissivity of full silicon heterojunction solar cells, as well as of its constituent materials – crystalline silicon wafer, indium tin oxide, n-, i- and p-type amorphous silicon – have been assessed by means of ellipsometry and FTIR. The experimental results show that the thermal emissivity of these cells is actually as high as in the more traditional structures, ~80% at 8 μm. Detailed optical modelling combining raytracing and transfer matrix formalism shows that the emissivity in these cells originates in the transparent conductive oxide layers themselves, where the doping is not high enough to result in a reflection that exceeds the increased free carrier absorption. Further modelling suggests that it is possible to obtain lower emissivity solar cells, but that a careful optimization of the transparent conductive layer needs to be done to avoid hindering the photovoltaic performance.
Issue Date: 11-Jul-2019
Date of Acceptance: 7-Jul-2019
URI: http://hdl.handle.net/10044/1/71895
DOI: https://doi.org/10.1016/j.solmat.2019.110051
ISSN: 0927-0248
Publisher: Elsevier
Start Page: 1
End Page: 7
Journal / Book Title: Solar Energy Materials and Solar Cells
Volume: 201
Copyright Statement: © 2019 The Authors. Published by Elsevier B.V. Under a Creative Commons license
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/M025012/1
Keywords: Energy
09 Engineering
03 Chemical Sciences
02 Physical Sciences
Publication Status: Published
Online Publication Date: 2019-07-11
Appears in Collections:Physics
Information and Communication Technology (ICT)
Faculty of Natural Sciences