光子学报  2018, Vol. 47 Issue (8): 0823003  DOI: 10.3788/gzxb20184708.0823003 0

### 引用本文

LIANG Wen-yue, ZHONG Jin-yao, XU Hai-tao, DENG Hai-dong, WANG Qi-sheng, LONG Yong-bing. Tailoring the Performance of Semitransparent Organic Solar Cells by Tandem One-dimensional Photonic Crystals[J]. Acta Photonica Sinica, 2018, 47(8): 0823003. DOI: 10.3788/gzxb20184708.0823003.

### 文章历史

(1 华南农业大学 电子工程学院, 广州 510642)
(2 五邑大学 数学与计算科学学院, 广东 江门 529020)

Tailoring the Performance of Semitransparent Organic Solar Cells by Tandem One-dimensional Photonic Crystals
LIANG Wen-yue 1,2, ZHONG Jin-yao 1, XU Hai-tao 1, DENG Hai-dong 1, WANG Qi-sheng 2, LONG Yong-bing 1
(1 Schoolof Electronic Engineering, South China Agricultural University, Guangzhou 510642, China)
(2 Schoolof Mathematics and Computational Science, Wuyi University, Jiangmen, Guangdong 529020, China)
Foundation item: Guangdong Natural Science Funds for Distinguished Young Scholar (No. 2014A030306005), National Natural Science Foundation of China (No. 11774099), Foundation for High-level Talents in Higher Education of Guangdong Province, China (Nos. Yue Cai-Jiao[2013]246, Jiang Cai-Jiao[2014]10), Natural Science Foundation of Guangdong Province, China (No. 2016A03031339), the Science and Technology Program of Guangzhou (No.201607010176)
Abstract: Tandem One-Dimensional Photonic Crystals (1DPCs) are employed to improve the photovoltaic conversion efficiency of the semitransparent organic solar cells and tailor the see-though colors of the devices. Transfer matrix method is employed to calculate the absorption in the active layer and transmission spectra of the devices. With these calculated data as inputs, the photovoltaic conversion efficiency and the see-though colors are calculated. It is revealed that an improvement of 24.4% in the photovoltaic conversion efficiency is achieved by tailoring the center wavelength of the bandgap of the top 1DPCs and bottom 1DPCs in the tandem 1DPCs. In addition, the see-through colors of the device can be tuned by tailoring the center wavelength of the bandgap of the top 1DPCs and bottom 1DPCs. Correspondingly, semitransparent organic solar cells with different see-through colors such as blue, green and red can be obtained. Compared with the single 1DPCs, tandem 1DPCs can lead to higher improvement in PCE and broader tunable range of the see-through color of the devices.
Key words: Organic solar cell    Photonic crystals    Semitransparent    Photovoltaic conversion efficiency    See-through color
OCIS Codes: 230.5298;160.4890;160.5298;230.0250;350.6050
0 引言

1 器件结构与理论模型 1.1 器件结构和设计原理

 图 1 基于叠层一维光子晶体的半透明有机太阳能电池的结构 Fig.1 Configuration of the semitransparent organic solar cells based on tandem one-dimensional photonic crystals

1.2 计算模型

 $\mathit{A}\left( \mathit{\lambda } \right){\rm{ = }}\frac{{\rm{1}}}{{\mathit{I}\left( \mathit{\lambda } \right)}}\int_{\mathit{x} \in {\rm{layer}}} {\frac{{{\rm{2 \mathsf{ π} }}\mathit{c}{\mathit{\varepsilon }_{\rm{0}}}\mathit{kn}{{\left| {\mathit{\boldsymbol{E}}\left( \mathit{x} \right)} \right|}^{\rm{2}}}}}{\mathit{\lambda }}{\rm{d}}\mathit{x}}$ (1)

 ${\mathit{J}_{{\rm{sc}}}}{\rm{ = }}\int {\frac{{\mathit{A}\left( \mathit{\lambda } \right)\mathit{I}\left( \mathit{\lambda } \right)}}{{\mathit{hc}}}\mathit{\lambda q}{\rm{d}}\mathit{\lambda }}$ (2)

 ${\rm{PCE = }}\frac{{{\mathit{J}_{{\rm{sc}}}}{\mathit{V}_{{\rm{oc}}}}{\rm{FF}}}}{{{\mathit{P}_{{\rm{in}}}}}}{\rm{}}$ (3)

 $\mathit{X}{\rm{ = }}\int_{360}^{800} {\mathit{I}\left( \mathit{\lambda } \right)} {\rm{ \times }}\mathit{\bar x}\left( \mathit{\lambda } \right){\rm{ \times }}\mathit{T}{\rm{(}}\mathit{\lambda }{\rm{)d}}\mathit{\lambda }$ (4)
 $\mathit{Y}{\rm{ = }}\int_{360}^{800} {\mathit{I}\left( \mathit{\lambda } \right)} {\rm{ \times }}\mathit{\bar y}\left( \mathit{\lambda } \right){\rm{ \times }}\mathit{T}{\rm{(}}\mathit{\lambda }{\rm{)d}}\mathit{\lambda }$ (5)
 $\mathit{Z}{\rm{ = }}\int_{360}^{800} {\mathit{I}\left( \mathit{\lambda } \right)} {\rm{ \times }}\mathit{\bar z}\left( \mathit{\lambda } \right){\rm{ \times }}\mathit{T}{\rm{(}}\mathit{\lambda }{\rm{)d}}\mathit{\lambda }$ (6)

 $\mathit{x}{\rm{ = }}\frac{\mathit{X}}{{\mathit{X}{\rm{ + }}\mathit{Y}{\rm{ + }}\mathit{Z}}}$ (7)
 $\mathit{y}{\rm{ = }}\frac{\mathit{Y}}{{\mathit{X}{\rm{ + }}\mathit{Y}{\rm{ + }}\mathit{Z}}}$ (8)
2 结果与讨论 2.1 利用叠层一维光子晶体提高半透明有机太阳能电池的光电转换效率

 图 2 顶一维光子晶体的禁带中心波长(λ01)对器件光电转换效率和光电转换效率提高率的影响 Fig.2 The effects of bandgap center wavelength(λ01) of the top 1DPCs in tandem 1DPCs on the PCE and PCE improvement of devices

 图 3 叠层一维光子晶体对器件活性层吸收光谱的影响 Fig.3 The effects of the tandem 1DPCs on absorption in the active layer for the devices
 图 4 器件1和器件2内部电场强度分布 Fig.4 Electric intensity distribution in Device1 and Device2

 图 5 叠层一维光子晶体中顶光子晶体和底光子晶体禁带中心波长对器件性能的影响 Fig.5 PCE as a function of λ01 and λ02 for tandem 1DPCs

2.2 利用叠层一维光子晶体调节半透明有机太阳能电池的透视颜色

 图 6 顶光子晶体禁带中心波长对器件透视颜色的影响 Fig.6 The effects of the center wavelength of bandgap of the top photonic crystals

 图 7 不同透视颜色的半透明有机太阳能器件的透过率光谱 Fig.7 The transmission spectra of the semitransparent organic solar cells with different see-through colors

3 结论