Silicon heterojunction solar cells with effectively transparent front contacts

Rebecca Saive, Mathieu Boccard, Theresa Saenz, Sisir Yalamanchili, Colton R. Bukowsky, Phillip Jahelka, Zhengshan Yu, Jianwei Shi, Zachary Holman, Harry A. Atwater

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

We demonstrate silicon heterojunction solar cells with microscale effectively transparent front contacts (ETCs) that redirect incoming light to the active area of the solar cell. Replacing standard contact electrodes by ETCs leads to an enhancement in short circuit current density of 2.2 mA cm-2 through mitigation of 6% shading losses and improved antireflection layers. ETCs enable low loss lateral carrier transport, with cells achieving an 80.7% fill factor. Furthermore, dense spacing of the contact lines allows for a reduced indium tin oxide thickness and use of non-conductive, optically optimized antireflection coatings such as silicon nitride. We investigated the performance of ETCs under varying light incidence angles, and for angles parallel to the ETC lines find that there is no difference in photocurrent density with respect to bare indium tin oxide layers. For angles perpendicular to the ETC lines, we find that the external quantum efficiency (EQE) always outperforms cells with flat contact grids.

Original languageEnglish (US)
Pages (from-to)593-598
Number of pages6
JournalSustainable Energy and Fuels
Volume1
Issue number3
DOIs
StatePublished - Jan 1 2017

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment

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