Performances and impedance spectroscopy of Small-molecule bulk heterojunction solar cells based on PtOEP: PCBM
Performances and impedance spectroscopy of Small-molecule bulk heterojunction solar cells based on PtOEP: PCBM
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DOI：
10.1007/s00339-018-1674-6
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
A. Abuelwafa;M. Dongol;M. El-Nahass;T. Soga
中科院分区：
文献类型：
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作者：
A. Abuelwafa;M. Dongol;M. El-Nahass;T. Soga
以八乙基铂卟啉（PtOEP）为施主材料，苯基-C61-丁酸甲酯（PCBM）为受主材料，采用旋涂技术制备了重量比为1：0.1 ~ 1：9的小分子体异质结（SBHJ）太阳能电池。在PtOEP：PCBM共混物中电荷转移络合物CTC的形成由与PCBM共混后PtOEP吸收峰的红移指定。在100 mW/cm 2（AM 1.5G）光照下，采用外量子效率（EQE）和电流密度-电压（J-V）特性研究了PtOEP：PCBM共混物的光伏性能。PtOEP：PCBM比为1：9的BHJ太阳能电池表现出最好的性能。在25 Hz至1 MHz的频率范围内检查阻抗谱（IS）。详细评估等效电路模型以评估阻抗谱参数。从介电极化过程的角度讨论了介电常数、介电损耗和介电模量. PtOEP：PCBM BHJ太阳能电池的介电模量表现为非德拜弛豫。
Small-molecule bulk heterojunction (SBHJ) solar cells based on platinum octaethylporphyrin (PtOEP) as donor material and phenyl-C61-butyric acid methyl ester (PCBM) as the acceptor were fabricated using spin coating techniques with weight ratios from 1:0.1 to 1:9. The formation of charge transfer complex CTC in the PtOEP: PCBM blend was specified from the redshift of the PtOEP absorption peak after blending with PCBM. The photovoltaic performance for PtOEP: PCBM blends were investigated using the external quantum efficiency (EQE) besides the current density–voltage (J–V) characteristics under illumination100 mW/cm2(AM1.5G). The BHJ solar cell with PtOEP: PCBM ratio of 1:9 exhibited the best performance. The impedance spectroscopy (IS) was examined in the frequency range from 25 Hz to 1 MHz. The equivalent circuit model was evaluated in details to evaluate the impedance spectroscopy parameters. Dielectric constant, dielectric lossand dielectric modulus were included and discussed in terms of dielectric polarization processes. Dielectric modulus displays the non-Debye relaxation in PtOEP: PCBM BHJ solar cells.