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Optical approaches to improving perovskite/Si tandemcells

Published online by Cambridge University Press:  18 January 2016

Haejun Chung,
Xingshu Sun and
Peter Bermel
Haejun Chung
Affiliation:
Birck Nanotechnology Center, Electrical and Computer Engineering, 1205 W. State St, West Lafayette, IN 47906, U.S.A.
Xingshu Sun
Affiliation:
Birck Nanotechnology Center, Electrical and Computer Engineering, 1205 W. State St, West Lafayette, IN 47906, U.S.A.
Peter Bermel*
Affiliation:
Birck Nanotechnology Center, Electrical and Computer Engineering, 1205 W. State St, West Lafayette, IN 47906, U.S.A.
*
*(Email: pbermel@purdue.edu)
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Abstract

Recently, metal-halide perovskites have demonstrated an extraordinarily rapidadvance in single junction cell efficiency to over 20%, while still offeringpotentially low costs. Since the bandgap is larger than the idealsingle-junction value, perovskite-based tandem cells can theoretically offereven higher efficiencies. Instead, however, the record tandem cell performancein experiments to date has come in slightly below that of record singlejunctions, although slightly higher than the same single junctions. In thiswork, we consider both how this disconnect can be explained quantitatively, andthen devise experimentally feasible, variance-aware approaches to address them.The first stage of our approach is based on reconfiguring dielectric frontcoatings to help reduce net reflected power and balance junction currents byreshaping the reflection peaks. This method could be applied to post-fabricationstage of perovskite/c-Si tandem cells, and also applicable to cell and modulelevel structures. In the second stage of our approach, we can almost entirelyeliminate Fresnel reflection by applying a conformal periodic light trappingstructure. In the best case, a short circuit current (Jsc) of 18.0mA/cm2 was achieved, after accounting for 4.8 mA/cm2of parasitic loss and 1.6 mA/cm2 reflection loss. Furtherimprovements may require a change in the baseline materials used in perovskitecells.

Keywords

photovoltaicnanostructuresimulation

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Articles
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MRS Advances , Volume 1 , Issue 14: Energy and Sustainability , 2016, pp. 901 - 910
Copyright
Copyright © Materials Research Society 2016 

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