Research Papers

Semiperiodicity versus periodicity for ultra broadband optical absorption in thin-film solar cells

[+] Author Affiliations
Mandana Jalali

University of Duisburg-Essen, General and Theoretical Electrical Engineering (ATE), Faculty of Engineering, Duisburg 47048, Germany

CENIDE—Center for Nanointegration Duisburg-Essen, Duisburg 47048, Germany

Shiraz University, Department of Physics, Faculty of Science, Eram Square, Shiraz 71454, Iran

Hamid Nadgaran

Shiraz University, Department of Physics, Faculty of Science, Eram Square, Shiraz 71454, Iran

Daniel Erni

University of Duisburg-Essen, General and Theoretical Electrical Engineering (ATE), Faculty of Engineering, Duisburg 47048, Germany

CENIDE—Center for Nanointegration Duisburg-Essen, Duisburg 47048, Germany

J. Nanophoton. 10(3), 036018 (Sep 22, 2016). doi:10.1117/1.JNP.10.036018
History: Received July 2, 2016; Accepted August 30, 2016
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Abstract.  We propose the use of one-dimensional semiperiodic front and back gratings based on Thue–Morse, Fibonacci, and Rudin–Shapiro (RS) binary sequences as promising photon management techniques for enhancing ultra-broadband optical absorption in thin-film solar cells. The semiperiodicity allows an aggregate light in-coupling into the active layer within the range of the solar spectrum that is less weak compared to an inherently broadband random grating, but has a much larger bandwidth than the strong in-coupling via a periodic grating configuration. The proper design procedure proposed here deviates from a canonical double grating synthesis as it adheres to an ultra-broadband design where the spectrally integrated absorption in the active material is the proper subject to optimization, leaving the grating perturbations just a measure to perturb and mold the trapped light field in the active layer accordingly. It is shown that by using a well-defined RS double grating in a 400-nm thick crystalline silicon solar cell, a 110.2% enhancement of the spectrally integrated optical absorption can be achieved relative to the reference case without grating.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Mandana Jalali ; Hamid Nadgaran and Daniel Erni
"Semiperiodicity versus periodicity for ultra broadband optical absorption in thin-film solar cells", J. Nanophoton. 10(3), 036018 (Sep 22, 2016). ; http://dx.doi.org/10.1117/1.JNP.10.036018


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