The Role of Spectrum in Encapsulated Bifacial Silicon Heterojunction Solar Cell Carrier Loss

Erin M. Tonita, Christopher E. Valdivia, Mariana I. Bertoni, Karin Hinzer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The effect of encapsulant on solar cell performance is widely understood to decrease overall cell power output due to absorption in encapsulating layers. In this work, we quantify the effect of encapsulation across the solar spectrum for high-efficiency bifacial silicon heterojunction solar cells in Synopsys TCAD Sentaurus to determine whether encapsulation causes a significant deviation in current loss trends compared to bare cells. Bare and encapsulated cells are modelled between 300-1200 nm and for air masses (AMs) between 1 and 10.0. Comparing current densities relative to bare cells for front illumination, encapsulation results in a 4.3% increase in parasitic absorption under AM1 illumination, and a 3.9% increase at AM10 as a consequence of the red-shift under higher AM. Despite spectral effects influencing current loss, trends of efficiency with AM are the same for bare and encapsulated cells, peaking around AM5. Encapsulated efficiency is decreased by 1.40 ± 0.02 % abs. compared to bare cells between AM1-10. Thus, while carrier transport is influenced by encapsulation in a wavelength-dependent manner, the overall effect on cell efficiency is a uniform offset for all spectra considered.

Original languageEnglish (US)
Title of host publication2021 IEEE 48th Photovoltaic Specialists Conference, PVSC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1080-1083
Number of pages4
ISBN (Electronic)9781665419222
DOIs
StatePublished - Jun 20 2021
Event48th IEEE Photovoltaic Specialists Conference, PVSC 2021 - Fort Lauderdale, United States
Duration: Jun 20 2021Jun 25 2021

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371

Conference

Conference48th IEEE Photovoltaic Specialists Conference, PVSC 2021
Country/TerritoryUnited States
CityFort Lauderdale
Period6/20/216/25/21

Keywords

  • air mass
  • bifacial photovoltaics
  • carrier transport
  • encapsulant
  • optoelectronic device modelling
  • recombination
  • silicon heterojunction
  • spectrum

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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