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A large-area luminescent downshifting layer containing an Eu3+ complex for crystalline silicon solar cells

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Abstract

The spectral mismatch between the distribution of sunlight (AM1.5G) and crystalline silicon (c-Si) solar cells is one of the most important limiting factors of the conversion efficiency of photovoltaic (PV) devices. As an effective solution, the use of the luminescence down-shifting (LDS) technique is an important way to improve the short-wavelength response of a solar cell by shifting high-energy photons to the visible range. Herein, a large-area (17 × 17 cm2) luminescent thin film consisting of a ternary europium (Eu3+) complex and polyvinyl alcohol (PVA) was successfully constructed through a solution casting method and further developed as an effective LDS layer to improve the photoelectric conversion efficiency of c-Si solar cells with a large active area (235 cm2). The self-standing LDS layer is flexible, transparent and easily attachable to the surface of the solar cell module. Compared with the uncoated c-Si solar cell, the one coated with the LDS layer displayed an enhancement of ∼15% in external quantum efficiency (EQE) due to the high luminescence quantum yield of the Eu3+ complex doped inside the layer. These results demonstrate that use of a large area luminescent film embedding an Eu3+ complex is a versatile and effective strategy to improve the conversion efficiency of large size PV devices, giving rise to its great potential application as an LDS material.

Graphical abstract: A large-area luminescent downshifting layer containing an Eu3+ complex for crystalline silicon solar cells

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Supplementary files

Article information


Submitted
23 Dec 2019
Accepted
14 Mar 2020
First published
16 Mar 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

A large-area luminescent downshifting layer containing an Eu3+ complex for crystalline silicon solar cells

D. Yang, H. Liang, Y. Liu, M. Hou, L. Kan, Y. Yang and Z. Zang, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04858H

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