NDLI: Optimization-based design of surface textures for thin-film Si solar cells — Are conventional Lambertian models relevant?

Content Provider	IEEE Xplore Digital Library
Author	Xing Sheng Johnson, S.G. Michel, J. Kimerling, L.C.
Copyright Year	2011
Description	Author affiliation: Department of Mathematics, Massachusetts Institute of Technology, Cambridge, MA, 02139 USA (Johnson, S.G.) \|\| Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139 USA (Xing Sheng; Michel, J.; Kimerling, L.C.)
Abstract	The efficiency of thin film silicon solar cells critically depends on the optical absorption. In this work, we numerically investigate the light trapping effect in the weak absorption regime for 1.5 μm thick crystalline silicon at normal incidence. Using electromagnetic simulations, we study the impact of different textures on the light absorption enhancement in two-dimensional (2D) device configuration. We discover that the light trapping effect of commercially used textures from Asahi glass is close to the 2D Lambertian result (F = πn), while optimized periodic gratings show better performances, and both rectangular and triangular gratings are capable to exceed the Lambertian result. To further explore the optimal light trapping structures, we develop a simulation method combining finite-difference time-domain (FDTD) calculations and the optimization algorithm (Nlopt-COBYLA). Over a 900–1100 nm wavelength range, our optimized surface texture in two dimensions (2D) enhances absorption by a factor of 2.7πn, considerably larger than the original πn Lambertian result and exceeding by almost 50% a recent generalization of Lambertian model for periodic structures in finite spectral range. However, our structure still obeys the conventional πn Lambertian limit when averaged over all the angles.
Starting Page	000017
Ending Page	000019
File Size	602611
Page Count	3
File Format	PDF
ISBN	9781424499663
ISSN	01608371
e-ISBN	9781424499656
DOI	10.1109/PVSC.2011.6185834
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon Photovoltaic cells Gratings Charge carrier processes Absorption Surface texture Performance evaluation
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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