Title:

On costeffectiveness of Perovskite/CSi tandem PV systems


Author(s):



Published by:

Publication date:

ECN
Solar Energy

2592017


ECN report number:

Document type:

ECNM17034

Conference Paper


Number of pages:

Full text:

5

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Presented at: EUPVSEC, Amsterdam, , 2529 september 2017.
Abstract:
The requirements to achieve cost reduction with perovskite/cSi tandem PV systems relative to singlejunction (SJ) perovskite or cSi PV systems are modeled. Specific cases assume a perovskite band gap of 1.7eV in tandem use and 1.55 eV in SJ use, both having the same module efficiency expressed as a fraction of the ShockleyQueisser limit for the band gap. Compared to SJ perovskite PV systems, current and foreseen cSi cell manufacturing costs are low enough to achieve cost reduction when adding cSi cells to a perovskite module, if, in particular, additional loss (other than related to SQ limit as a function of band gap) of power conversion efficiency (PCE) of the perovskite module from SJ to tandem can be mostly avoided (it should be less than about 1020%). Compared to SJ cSi PV systems, requirements for costeffective modification to tandem structure are, not suprisingly, a high PCE and low cost for the added perovskite stack. For example, for reasonable parameter assumptions, a semitransparent perovskite PCE of 16.4% and a stack fabrication cost of about 35 €/m2 would result in 10% cost reduction, the same PCE with a stack fabrication cost of 17€/m2 in 16% cost reduction, for tandem PV systems relative to the cSi technology. In both tandemSJ comparisons, if there is a significant increase of module manufacturing cost for, e.g., more expensive junction box, power optimizer, additional encapsulant materials, etc., or balanceofsystem costs these should be included in the cSi cell or perovskite stack costs (translated to the m2 cost), respectively.
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