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首页> 外文期刊>Advanced energy materials >Efficiency Exceeding 11% in Tandem Polymer Solar Cells Employing High Open-Circuit Voltage Wide-Bandgap pi-Conjugated Polymers
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Efficiency Exceeding 11% in Tandem Polymer Solar Cells Employing High Open-Circuit Voltage Wide-Bandgap pi-Conjugated Polymers

机译：采用高开路电压宽带隙π共轭聚合物的串联聚合物太阳能电池效率超过11％

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摘要

The emerging field of tandem polymer solar cells (TPSCs) enables a feasible approach to deal with the fundamental losses associated with single-junction polymer solar cells (PSCs) and provides the opportunity to propel their overall performance. Additionally, the rational selection of appropriate subcell photoactive polymers with complementary absorption profiles and optimal thicknesses to achieve balanced photocurrent generation are very important issues which must be addressed in order to realize paramount device performance. Here, two side chain fluorinated wide-bandgap pi-conjugated polymers P1 (2F) and P2 (4F) in TPSCs have been used. These pi-conjugated polymers have high absorption coefficients and deep highest occupied molecular orbitals which lead to high open-circuit voltages (V-oc) of 0.91 and 1.00 V, respectively. Using these pi-conjugated polymers, TPSCs have been successfully fabricated by combining P1 or P2 as front cells with PTB7-Th as back cells. The optimized TPSCs deliver outstanding power conversion efficiencies of 11.42 and 10.05%, with high V-oc's of 1.64 and 1.72 V, respectively. These results are analyzed by balance of charge mobilities, and optical and electrical modeling is combined to demonstrate simultaneous improvement in all photovoltaic parameters in TPSCs.
机译：串联聚合物太阳能电池（TPSC）的新兴领域为解决与单结聚合物太阳能电池（PSC）相关的基本损耗提供了一种可行的方法，并为推动其整体性能提供了机会。另外，合理选择具有互补吸收曲线和最佳厚度以实现平衡的光电流产生的合适的子电池光敏聚合物是非常重要的问题，必须解决这些问题才能实现最重要的器件性能。在这里，已经使用了TPSC中的两个侧链氟化的宽带隙π-共轭聚合物P1（2F）和P2（4F）。这些π-共轭聚合物具有高吸收系数和极高的最高占据分子轨道，这分别导致0.91和1.00 V的高开路电压（V-oc）。使用这些pi共轭聚合物，通过将P1或P2作为前电池与PTB7-Th作为后电池相结合，已经成功地制造了TPSC。经过优化的TPSC提供出色的功率转换效率，分别为11.42和10.05％，高V-oc分别为1.64和1.72V。通过电荷迁移率的平衡来分析这些结果，并结合光学和电气模型以证明TPSC中所有光伏参数的同时改善。

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