Surface Chemistry Laboratory of Electronic Materials (SCHEMA), Department of Chemical Engineering, POSTECH, Pohang 790-784, Korea.
Nanotechnology. 2014 Feb 14;25(6):065401. doi: 10.1088/0957-4484/25/6/065401. Epub 2014 Jan 16.
One-dimensional (1D) zinc oxide (ZnO) nanostructures are considered to be promising materials for use in thin film solar cells because of their high light harvesting and charge collection efficiencies. We firstly report enhanced photovoltaic performances in Cu2ZnSnS4 (CZTS) thin film solar cells prepared using ZnO nanostructures. A CdS-coated, vertically well-aligned ZnO nanorod (NR) array was prepared via a hydrothermal reaction and nanocrystal layer deposition (NCLD) and was used as a transparent window/buffer layer in a CZTS thin film photovoltaic. A light absorber CZTS thin film was prepared on the CdS/ZnO NRs in air by depositing a non-toxic precursor solution that was annealed in two steps at temperatures up to 250 °C. The crystallized CZTS phase completely infiltrated the CdS/ZnO NR array. The nanostructured ZnO array provided improved light harvesting behavior compared to a thin film configuration by measuring UV-vis transmittance spectroscopy. The prepared CZTS/CdS/ZnO NR device exhibited a solar energy conversion efficiency of 1.2%, which is the highest efficiency yet reported for nanostructured superstrate CZTS solar cells.
一维（1D）氧化锌（ZnO）纳米结构因其高光捕获和电荷收集效率而被认为是用于薄膜太阳能电池的有前途的材料。我们首次报告了在使用 ZnO 纳米结构制备的 Cu2ZnSnS4（CZTS）薄膜太阳能电池中增强的光伏性能。通过水热反应和纳米晶层沉积（NCLD）制备了具有垂直良好排列的 ZnO 纳米棒（NR）阵列的 CdS 涂层，并将其用作 CZTS 薄膜光伏的透明窗口/缓冲层。通过在空气中沉积无毒前体溶液并在高达 250°C 的温度下分两步退火，在 CdS/ZnO NR 上制备了光吸收 CZTS 薄膜。结晶的 CZTS 相完全渗透 CdS/ZnO NR 阵列。与薄膜结构相比，纳米结构 ZnO 阵列通过测量紫外-可见透射光谱提供了改进的光捕获行为。制备的 CZTS/CdS/ZnO NR 器件表现出 1.2%的太阳能转换效率，这是迄今为止报道的用于纳米结构顶部接触 CZTS 太阳能电池的最高效率。
