Imperial College London


Faculty of EngineeringDepartment of Chemical Engineering

Professor of Clean Energy Technologies



+44 (0)20 7594 1601c.markides Website




404ACE ExtensionSouth Kensington Campus






BibTex format

author = {Riverola, A and Mellor, AV and Alonso, Alvarez D and Ferre, LLin L and Guarracino, I and Markides, CN and Paul, DJ and Ekins-Daukes, N},
doi = {10.1016/j.solmat.2017.10.002},
journal = {Solar Energy Materials and Solar Cells},
pages = {607--615},
title = {Mid-infrared emissivity of crystalline silicon solar cells},
url = {},
volume = {174},
year = {2017}

RIS format (EndNote, RefMan)

AB - The thermal emissivity of crystalline silicon photovoltaic (PV) solar cells plays a role in determining the operating temperature of a solar cell. To elucidate the physical origin of thermal emissivity, we have made an experimental measurement of the full radiative spectrum of the crystalline silicon (c-Si) solar cell, which includes both absorption in the ultraviolet to near-infrared range and emission in the mid-infrared. Using optical modelling, we have identified the origin of radiative emissivity in both encapsulated and unencapsulated solar cells. We find that both encapsulated and unencapsulated c-Si solar cells are good radiative emitters but achieve this through different effects. The emissivity of an unencapsulated c-Si solar cell is determined to be 75% in the MIR range, and is dominated by free-carrier emission in the highly doped emitter and back surface field layers; both effects are greatly augmented through the enhanced optical outcoupling arising from the front surface texture. An encapsulated glass-covered cell has an average emissivity around 90% on the MIR, and dips to 70% at 10 µm and is dominated by the emissivity of the cover glass. These findings serve to illustrate the opportunity for optimising the emissivity of c-Si based collectors, either in conventional c-Si PV modules where high emissivity and low-temperature operation is desirable, or in hybrid PV-thermal collectors where low emissivity enables a higher thermal output to be achieved.
AU - Riverola,A
AU - Mellor,AV
AU - Alonso,Alvarez D
AU - Ferre,LLin L
AU - Guarracino,I
AU - Markides,CN
AU - Paul,DJ
AU - Ekins-Daukes,N
DO - 10.1016/j.solmat.2017.10.002
EP - 615
PY - 2017///
SN - 0927-0248
SP - 607
TI - Mid-infrared emissivity of crystalline silicon solar cells
T2 - Solar Energy Materials and Solar Cells
UR -
UR -
VL - 174
ER -