Increase in short-wavelength response of encapsulated CIGS devices by doping the encapsulation layer with luminescent material

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• 作者：Efthymios Klampaftis^a ; David Ross^a ; Sieghard Seyrling^b ; Ayodhya N. Tiwari^b ; Bryce S. Richards^a ; ^{B.S.Richards@hw.ac.uk}
• 关键词：CIGS ; Colour ; Luminescent down-shifting ; Encapsulation ; EVA ; Spectral conversion
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 期刊代码：81_09270248
• 类别：ce
• 出版时间：June, 2012
• 卷：101
• 期：Complete
• 页码：62-67
• 文件大小：515 K

摘要

Photovoltaic devices based on Cu(In,Ga)Se₂ (CIGS) absorbers exhibit poor response to short-wavelength (位) photons, mainly due to the parasitic absorption of the commonly used zinc oxide window and cadmium sulphide (CdS) buffer layers. In this work, it is shown that the energy content of these photons can be better harnessed if the encapsulation layer of modules is doped with luminescent materials. It is shown that the luminescent down-shifting (LDS) of short-位 photons increases the external quantum efficiency (EQE) of CIGS devices by up to 25%absolute in the range 300-380 nm and by up to 40%absolute in the region 300-460 nm, for devices with 50-nm- and 100-nm-thick CdS layers, respectively. Overall, the short-circuit current density (J_SC) of CIGS devices covered with luminescent encapsulation improved by 螖J_SC=0.6%for violet-doped EVA and up to 螖J_SC=1.8%for a violet-yellow dye mixture. By experimenting with devices of different CdS thicknesses and short-位 EQE profiles, it is suggested that CIGS PV modules equipped with LDS layers must be optimised as a system and all photoactive components of the device be considered in parallel.