YVO4: Eu3+@SiO2下转换发光特性及其太阳电池应用研究

doi:10.15541/jim20160040

摘要/Abstract

摘要：

铕掺杂钒酸钇(YVO₄: Eu³⁺)作为常用的下转换发光材料一直受到广泛的关注和研究, 但是YVO₄: Eu³⁺的表面缺陷会严重影响材料的发光效率。为了进一步改善YVO₄: Eu³⁺纳米粉体材料的粒度分布和形貌特点, 在亚微米级别的SiO₂微球表面涂覆一层YVO₄: Eu³⁺, 制成YVO₄: Eu³⁺@SiO₂核-壳结构, 得到单分散的球形YVO₄: Eu³⁺下转换发光材料, 实现YVO₄: Eu³⁺的发光性能和SiO₂球形特性的有机结合。研究发现, 当壳核比为0.6时, YVO₄: Eu³⁺@SiO₂核-壳结构材料的发光强度可达到纯纳米粉体材料发光强度的90%以上。将改性后的YVO₄: Eu³⁺@SiO₂核-壳结构材料涂覆在硅基薄膜太阳电池上, 可使电池的短路电流密度和转化效率分别由6.694 mA/cm²和9.40%提升至8.417 mA/cm²和10.15%, 增益效果较为明显。实验结果表明, 采用溶液法制备的YVO₄: Eu³⁺@SiO₂纳米粉体材料由于具有形貌规则、团聚小和尺寸分布均匀等特点, 可用作硅基薄膜太阳电池下转换发光层材料。

关键词: 钒酸钇, 核-壳结构, 太阳电池, 下转换

Abstract:

Europium ions doped yttrium vanadate (YVO₄: Eu³⁺) has excellent emission properties for down-conversion applications. However, the serious surface defects of YVO₄: Eu³⁺ hinder the improvement of luminescent efficiency. In order to improve the particle size distribution and morphology of YVO₄: Eu³⁺ nano-powders, mono-dispersed spherical YVO₄: Eu³⁺@SiO₂ core-shell structure materials were prepared by coating a layer of YVO₄: Eu³⁺onto the surface of SiO₂ microspheres. With the shell-core ratio setting as 0.6, the luminescence intensity of YVO₄: Eu³⁺@SiO₂core-shell structure composite could reach up to more than 90% of pure YVO₄: Eu³⁺ nano-powder. Furthermore, the prepared YVO₄: Eu³⁺@SiO₂ core-shell structure films were used as down-conversion materials for amorphous silicon thin film solar cells. The cell parameters such as short current density and photoelectric conversion efficiency increased from original 6.694 mA/cm² and 9.40% to 8.417 mA/cm² and 10.15%, respectively. Thus YVO₄: Eu³⁺@SiO₂ core-shell configuration can be fabricated from YVO₄: Eu³⁺ and SiO₂ microsphere to avoid agglomeration. The prepared YVO₄: Eu³⁺@SiO₂ core-shell structures have regular morphology and uniform particle sizes, which are suitable to be used as down-conversion light emitting layer in amorphous silicon solar cells.

Key words: yttrium vanadate, core-shell structure, solar cell, down-conversion

中图分类号:

TB303

檀满林, 尚旭冉, 马清, 王晓伟, 符冬菊, 李冬霜, 张维丽, 陈建军, 张化宇. YVO₄: Eu³⁺@SiO₂下转换发光特性及其太阳电池应用研究[J]. 无机材料学报, 2016, 31(10): 1110-1116.

TAN Man-Lin, SHANG Xu-Ran, MA Qing, WANG Xiao-Wei, FU Dong-Ju, LI Dong-Shuang, ZHANG Wei-Li, CHEN Jian-Jun, ZHANG Hua-Yu. Down-conversion Photoluminescence Properties of YVO₄: Eu³⁺@SiO₂ Core-shell Structures for Solar Cell Applications[J]. Journal of Inorganic Materials, 2016, 31(10): 1110-1116.

图/表 10

图1 SiO2微球及YVO4: Eu3+@SiO2核-壳结构的微观形貌

Fig. 1 SEM images of SiO2 microspheres and YVO4: Eu3+@SiO2 core-shell structure powders (a) SiO2 microsphere; (b, c) Shell-core ratio setting as 0.2; (d) Shell- core ratio setting as 0.6

图2 (a)SiO2微球, (b)YVO4: Eu3+@SiO2核壳结构和(c)纯YVO4: Eu3+纳米粉体的XRD图谱

Fig. 2 XRD patterns of (a) SiO2 microsphere, (b) YVO4: Eu3+@SiO2 core-shell structure and (c) YVO4: Eu3+

图3 (a)SiO2微球、(b)YVO4: Eu3+@SiO2核壳结构和(c)纯YVO4: Eu3+纳米粉体的傅立叶红外光谱图

Fig. 3 Fourier transformed infrared spectra of (a) SiO2 microsphere, (b) YVO4: Eu3+@SiO2 core-shell structure and (c) YVO4: Eu3+

图4 YVO4: Eu3+和YVO4: Eu3+@SiO2核壳结构的光致发光谱

Fig. 4 Photoluminescence spectra of YVO4: Eu3+ and YVO4: Eu3+@SiO2

图5 不同壳核比YVO4: Eu3+@SiO2的5D0→7F2发射峰光强(619nm)

Fig. 5 Photoluminescence peak intensity (619 nm) of 5D0→7 F2 for YVO4: Eu3+@SiO2 with different shell-core ratios

图6 采用下转换发光层的非晶硅太阳电池

Fig.6 Amorphous silicon solar cell with down-conversion emission layer (a) Cell configuration; (b) Optical path

图7 不同YVO4: Eu3+质量百分比的下转换发光层透过率曲线

Fig. 7 Transmittance curves of down-conversion emission films with different weight percents of YVO4: Eu3+ (a) 4wt%; (b) 6wt%; (c) 8wt%; (d) 10wt%

图8 采用下转换发光层的非晶硅太阳电池电流-电压曲线

Fig. 8 Current-voltage characteristics of amorphous silicon solar cells with down-conversion emission layers

表1 实验研制的非晶硅太阳能电池光电参数

Table 1 Photoelectric parameters of the fabricated amorphous silicon (a-Si) solar cells

Sample	V_oc/V	J_sc/ (mA·cm^-2)	FF	η/%
Common a-Si solar cell	0.650	6.694	0.736	9.40
YVO₄: Eu³⁺	0.652	7.843	0.773	9.89
YVO₄: Eu³⁺@SiO₂	0.652	8.417	0.781	10.15

图9 采用下转换发光层的非晶硅太阳电池外量子效率曲线

Fig.9 External quantum efficiency curves of amorphous silicon solar cells with down-conversion emission layers

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YVO₄: Eu³⁺@SiO₂下转换发光特性及其太阳电池应用研究

Down-conversion Photoluminescence Properties of YVO₄: Eu³⁺@SiO₂ Core-shell Structures for Solar Cell Applications

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