Light Trapping for High Efficiency Heterojunction Crystalline Si Solar Cells

Qi Wang, Yueqin Xu, Eugene Iwaniczko, Matthew Page

Research output: Contribution to journalArticlepeer-review

4 Scopus Citations


Light trapping plays an important role to achieve high short circuit current density (Jsc) and high efficiency for amorphous/crystalline Si heterojunction solar cells. Si heterojunction uses hydrogenated amorphous Si for emitter and back contact. This structure of solar cell posses highest open circuit voltage of 0.747 V at one sun for c-Si based solar cells. It also suggests that over 25% record-high efficiency is possible with further improvement of Jsc. Light trapping has two important tasks. The first one is to reduce the surface reflectance of light to zero for the solar spectrum that Si has a response. The second one is to increase the effective absorption length to capture all the photon. For Si heterojunction solar cell, surface texturing, anti-reflectance indium tin oxides (ITO) layer at the front and back are the key area to improve the light trapping.

Original languageAmerican English
Pages (from-to)1129-1134
Number of pages6
JournalECS Transactions
Issue number1
StatePublished - 2011
Event10th China Semiconductor Technology International Conference 2011, CSTIC 2011 - Shanghai, China
Duration: 13 Mar 201114 Mar 2011

Bibliographical note

See NREL/CP-5200-51248 for preprint.

NREL Publication Number

  • NREL/JA-5200-52456


  • efficiency
  • light trapping
  • Si solar cells


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