Suns-V oc characteristics of Si heterojunction solar cells: Role of the heterointerface

Raghu V.K. Chavali, Jian Li, Corsin Battaglia, Stefaan De Wolf, Jeffery L. Gray, Muhammad A. Alam

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Suns-Voc measurements are frequently used to study the intrinsic potential of a solar cell technology, by excluding the parasitic series resistance effects. However, when applied to a-Si/c-Si heterojunction (SHJ) solar cells, the results show a peculiar turn-around at illumination intensities that has been attributed to an extrinsic Schottky contact. In this paper, we demonstrate that this voltage turn-around rather may arise from the heterojunction (HJ), inherent to SHJ solar cell, without having to invoke the Schottky contact assumption. We use numerical simulations to explore the full J-V under different illumination and temperature conditions. Using these J-Vs, we establish the bias, intensity, temperature conditions necessary to observe the voltage turn-around in these cells. We validate the HJ hypothesis using an extensive set of experiments on a high- efficiency SHJ solar cell. Our work establishes Suns-Voc as a powerful characterization tool for extracting the cell parameters that limit efficiency in heterojunction devices.

Original languageEnglish (US)
Title of host publication2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-3
Number of pages3
ISBN (Electronic)9781509056057
DOIs
StatePublished - Jan 1 2017
Event44th IEEE Photovoltaic Specialist Conference, PVSC 2017 - Washington, United States
Duration: Jun 25 2017Jun 30 2017

Publication series

Name2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017

Conference

Conference44th IEEE Photovoltaic Specialist Conference, PVSC 2017
CountryUnited States
CityWashington
Period06/25/1706/30/17

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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