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首页> 外文期刊>Advanced Functional Materials >Bipolar Charge Transport in PCPDTBT-PCBM Bulk-Heterojunctions for Photovoltaic Applications
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Bipolar Charge Transport in PCPDTBT-PCBM Bulk-Heterojunctions for Photovoltaic Applications

机译：光伏应用中PCPDTBT-PCBM体-异质结中的双极电荷传输

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An experimental study of the transport properties of a low-bandgap conjugated polymer giving high photovoltaic quantum efficiencies in the near infrared spectral region (E_(g-opt) ～ 1.35 eV) is presented. Using a organic thin film transistor geometry, we demonstrate a relatively high in-plane hole mobility, up to 1.5 × 10~(-2) cm~2 V~(-1)s~(-1) and quantify the electron mobility at 3 × 10~(-5) cm~2 V~(-1)s~(-1) on a SiO_2 dielectric. In addition, singular contact behavior results in bipolar quasi-Ohmic injection both from low and high workfunction metals like LiF/Al and Au. X-ray investigations revealed a degree of interchain π-stacking that is probably embedded in a disordered matrix. Disorder also manifests itself in a strong positive field dependence of the hole mobility from the electric field. In blends made with the electron acceptor methanofullerene [6,6]-phenyl C_(61) butyric acid methyl ester (PCBM), the transistor characteristics suggest a relatively unfavorable intermixing of the two components for the application to photovoltaic devices. We attribute this to a too fine dispersion of [C60]-PCBM in the polymer matrix, that is also confirmed by the quenching of the photoluminescence signal measured in PCPDTBT [C60]-PCBM films with various composition. We show that a higher degree of phase separation can be induced during the film formation by using 1,8-octanedithiol (ODT), which leads to a more efficient electron percolation in the [C60]-PCBM. In addition, the experimental results, in combination with those of solar cells seem to support the correlation between the blend morphology and charge recombination. We tentatively propose that the drift length, and similarly the electrical fill factor, can be limited by the recombination of holes with electrons trapped on isolated [C60]-PCBM clusters. Ionized and isolated [C60]-PCBM molecules can modify the local electric field in the solar cell by build-up of a space-charge. The results also suggest that further improvements of the fill factor may also be limited by a strong electrical-field dependence of the hole transport.
机译：提出了一种低带隙共轭聚合物在近红外光谱区域（E_（g-opt）〜1.35 eV）具有高光伏量子效率的传输特性的实验研究。使用有机薄膜晶体管的几何形状，我们证明了相对较高的面内空穴迁移率，最高为1.5×10〜（-2）cm〜2 V〜（-1）s〜（-1），并量化了在SiO_2电介质上3×10〜（-5）cm〜2 V〜（-1）s〜（-1）此外，奇异的接触行为会导致由低和高功函数金属（如LiF / Al和Au）产生双极准欧姆注入。 X射线研究表明，一定程度的链间π堆积可能嵌入无序矩阵中。无序现象还表现为电场对空穴迁移率的强正场依赖性。在用电子受体亚甲基富勒烯[6,6]-苯基C_（61）丁酸甲酯（PCBM）制成的共混物中，晶体管的特性表明这两种组分相对不利地混合在一起，用于光伏器件。我们将其归因于[C60] -PCBM在聚合物基质中的分散太细，这也通过在具有各种组成的PCPDTBT [C60] -PCBM膜中测得的光致发光信号猝灭来证实。我们显示，通过使用1,8-辛二硫醇（ODT），可以在成膜过程中诱导更高程度的相分离，从而在[C60] -PCBM中导致更有效的电子渗透。另外，结合太阳能电池的实验结果似乎支持混合形态与电荷复合之间的相关性。我们暂定提出漂移长度以及类似的电填充因子可以通过空穴与捕获在孤立的[C60] -PCBM簇上的电子的复合来限制。电离和隔离的[C60] -PCBM分子可以通过积累空间电荷来改变太阳能电池中的局部电场。结果还表明，填充系数的进一步改善也可能受到空穴传输的强电场依赖性的限制。

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