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Spectroscopic Ellipsometry for Photovoltaics pp 29–82Cite as

Analysis of Optical and Recombination Losses in Solar Cells

Part of the Springer Series in Optical Sciences book series (SSOS,volume 214)

Abstract

For efficient optimization of solar-cell device structures and processing, it is essential to reveal the performance-limiting optical and physical factors in solar cells. Quite fortunately, a global solar-cell characterization method has recently been developed from which the parasitic light absorption and carrier recombination in the devices are evaluated systematically based on external quantum efficiency (EQE) analysis. In this new method, the optical and recombination losses in complex solar cell structures are readily determined within the framework of a rather simple optical admittance method. The EQE analysis method described in this chapter is appropriate for a wide variety of photovoltaic devices, including crystalline Si (c-Si), hydrogenated amorphous silicon (a-Si:H), Cu(In,Ga)Se2 chalcopyrite, Cu2ZnSn(S,Se)4 kesterite, CdTe zincblende and hybrid perovskite solar cells, and provides excellent fitting to numerous EQE spectra obtained experimentally. This chapter introduces the basic concept of the global EQE analysis method in which the effects of (i) light scattering by submicron textures and (ii) carrier recombination in light absorbers are fully incorporated. As examples, the EQE analyses of Cu(In,Ga)Se2, Cu2ZnSnSe4, Cu2ZnSnS4, CdTe, a-Si:H and c-Si solar cells are described. Based on the analysis results, we will further discuss the carrier loss mechanisms in different types of photovoltaic devices.

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Authors and Affiliations

  1. Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan

    Hiroyuki Fujiwara, Akihiro Nakane & Daisuke Murata

  2. Research Center for Photovoltaics, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, 305-8568, Japan

    Hitoshi Tampo, Takuya Matsui & Hajime Shibata

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  1. Hiroyuki Fujiwara
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Correspondence to Hiroyuki Fujiwara .

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  1. Department of Electrical, Electronic and Computer Engineering, Gifu University, Gifu, Japan

    Prof. Hiroyuki Fujiwara

  2. Department of Physics and Astronomy, The University of Toledo, Toledo, OH, USA

    Prof. Robert W. Collins

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Fujiwara, H., Nakane, A., Murata, D., Tampo, H., Matsui, T., Shibata, H. (2018). Analysis of Optical and Recombination Losses in Solar Cells. In: Fujiwara, H., Collins, R. (eds) Spectroscopic Ellipsometry for Photovoltaics. Springer Series in Optical Sciences, vol 214. Springer, Cham. https://doi.org/10.1007/978-3-319-95138-6_2

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