成果報告書詳細
管理番号20140000000601
タイトル*平成25年度中間年報 新エネルギー技術研究開発 革新的太陽光発電技術研究開発 (革新型太陽電池国際研究拠点整備事業) 低倍率集光型薄膜フルスペクトル太陽電池の研究開発(サブセル界面接合技術)
公開日2014/12/27
報告書年度2013 - 2013
委託先名三菱電機株式会社
プロジェクト番号P07015
部署名新エネルギー部
和文要約
英文要約Title: NEDO innovative PV technology, "Thin film full spectrum solar cells with low concentration ratios", Multi-cell interface junction. (FY 2008 - FY 2016) FY 2013 Annual Report

 The purpose of our research is to develop (a) a front transparent conductive oxide (TCO) with a high transparency and superior light scattering, (b) a low resistance junction between the front TCO and p-type silicon oxide (p-SiO) in thin film full spectrum solar cells. To achieve this purpose, we have proposed novel front TCO consisting of light scattering layer/conducting layer/contact layer.
 Textured Zn1-xMgxO films as the light scattering layer were prepared by RF magnetron co-sputtering of ZnO and MgO targets and subsequent etching in a dilute hydrochloric acid (HCl) solution. The Zn1-xMgxO films with Mg content of x less than or equal to 0.35 showed wurtzite structures with (002) preferred orientation without segregation of MgO phase, and transformed into textured surfaces with U-shaped valleys after the HCl treatment. The U-shaped textures exhibited high haze values in excess of 40% at a wavelength of 800 nm. In contrast, we clearly observed the optical absorption edge of the films blueshifted to shorter than 250 nm in a wavelength with increasing Mg content up to x = 0.70. Consequently, textured Zn0.65Mg0.35O achieved the optical absorption edge at 300 nm and haze value of 40% at 800 nm by optimizing Mg content and surface morphology.
 In the present work, we successfully demonstrated a light scattering layer of wide-band-gap TCO front electrodes with a high transparency and superior light scattering for thin film solar cells. These results proved that the textured ZnMgO is a promising candidate for a silicon top cell of the thin film full spectrum solar cells.
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