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

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

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

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
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
Publication statusPublished - 2017 Jan 1
Event44th IEEE Photovoltaic Specialist Conference, PVSC 2017 - Washington, United States
Duration: 2017 Jun 252017 Jun 30

Publication series

Name2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017

Other

Other44th IEEE Photovoltaic Specialist Conference, PVSC 2017
CountryUnited States
CityWashington
Period17-06-2517-06-30

All Science Journal Classification (ASJC) codes

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

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