Impact of light management on photovoltaic characteristics of GaAs solar cells with photonic crystals and quasi-photonic crystals

Yi Chun Lai, Tung Ting Yang, Peichen Yu, Mu Min Hung, Martin Charlton

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

2 Scopus citations

Abstract

In detailed balance model, the efficiency of single-junction solar cells can be potentially as high as 33.5% under AM 1.5G illumination. However the best state-of-the-art devices are still far lower than those figures, even the electronic quality is nearly perfect. Therefore the efficiency gap should stem from the light management inside solar cells. Recently, external radiation efficiency (ηext) derived from detailed balance model is emphasized to evaluate light management and photon recycling, which aggregates the loss of backward emission into substrate and non-radiative recombination. This factor can be highly relevant to the cell's performance, especially open-circuit voltage (Voc), and maximizing Voc is generally considered as the last mile to approach ultra-high efficiency limit. In this work, we try to quantify the Voc enhancement in GaAs solar cells by enhancing light extraction. The simulation tools are RCWA simulation and photon recycling model NREL developed recently. The top structures we simulate here are TiO2 cones arranged in three PC/QPC lattices. After our calculation, the QPC 12-folds symmetry can make the biggest Voc enhancement 11.21meV compared with bare one, and the structure also possess extraordinary omni-directional anti-reflection ability for maintaining high Jsc. Our results also show that using this way to enhance Voc is especially suitable for cells with ordinary material quality. Therefore, the requests of ideal top structures for solar cell's use are not only near-perfect anti-reflection, but the ability to maximize light extraction if no feature of angular filter exists.

Original languageEnglish
Title of host publicationPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices III
PublisherSPIE
ISBN (Print)9780819498946
DOIs
StatePublished - 1 Jan 2014
EventPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices III - San Francisco, CA, United States
Duration: 3 Feb 20146 Feb 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8981
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferencePhysics, Simulation, and Photonic Engineering of Photovoltaic Devices III
CountryUnited States
CitySan Francisco, CA
Period3/02/146/02/14

Keywords

  • Light extraction efficiency
  • Open-circuit voltage
  • Photon recycling
  • Photonic crystals
  • Single-junction gaas solar cells

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    Lai, Y. C., Yang, T. T., Yu, P., Hung, M. M., & Charlton, M. (2014). Impact of light management on photovoltaic characteristics of GaAs solar cells with photonic crystals and quasi-photonic crystals. In Physics, Simulation, and Photonic Engineering of Photovoltaic Devices III [89810F] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8981). SPIE. https://doi.org/10.1117/12.2038889