All‐Polymer Solar Cells with over 12% Efficiency and a Small Voltage Loss Enabled by a Polymer Acceptor Based on an Extended Fused Ring Core,Advanced Energy Materials

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All‐Polymer Solar Cells with over 12% Efficiency and a Small Voltage Loss Enabled by a Polymer Acceptor Based on an Extended Fused Ring Core
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-07-30 , DOI: 10.1002/aenm.202001408
Huatong Yao ₁ , Lik‐Kuen Ma ₁ , Han Yu ₁ , Jianwei Yu ₂ , Philip C. Y. Chow ₁ , Wenyue Xue ₃ , Xinhui Zou ₁ , Yuzhong Chen ₁ , Jiaen Liang ₁ , Lingeswaran Arunagiri ₁ , Feng Gao ₂ , Huiliang Sun ₁ , Guangye Zhang ₄ , Wei Ma ₃ , He Yan _{1,

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Affiliation

Although the field of all‐polymer solar cells (all‐PSCs) has seen rapid progress in device efficiencies during the past few years, there are limited choices of polymer acceptors that exhibit strong absorption in the near‐IR region and achieve high open‐circuit voltage (V_OC) at the same time. In this paper, an all‐PSC device is demonstrated with a 12.06% efficiency based on a new polymer acceptor (named PT‐IDTTIC) that exhibits strong absorption (maximum absorption coefficient: 2.41 × 10⁵ cm⁻¹) and a narrow optical bandgap (1.49 eV). Compared to previously reported polymer acceptors such as those based on the indacenodithiophene (IDT) core, the indacenodithienothiophene (IDTT) core has further extended fused ring, providing the polymer with extended absorption into the near‐IR region and also increases the electron mobility of the polymer. By blending PT‐IDTTIC with the donor polymer, PM6, a high‐efficiency all‐PSC is achieved with a small voltage loss of 0.52 V, without sacrificing J_SC and FF, which demonstrates the great potential of high‐performance all‐PSCs.

中文翻译：

全聚合物太阳能电池具有超过12％的效率，并且基于扩展的熔融环芯的聚合物受体能够实现较小的电压损耗

尽管在过去几年中全聚合物太阳能电池（all-PSC）领域在器件效率方面取得了飞速发展，但在近红外区域表现出强吸收并实现高开路的聚合物受体的选择有限电压（V _OC）同时。在本文中，基于一种新型的聚合物受体（名为PT-IDTTIC）展示了一种全PSC器件，其效率为12.06％，该受体表现出强吸收性（最大吸收系数：2.41×10 ⁵ cm ^-1）和窄的光学带隙（1.49 eV）。与先前报道的聚合物受体（例如基于茚并二噻吩并噻吩（IDT）核的那些）相比，茚并二噻吩并噻吩（IDTT）核具有进一步延伸的稠合环，从而为聚合物提供了在近IR区域的扩展吸收并还提高了聚合物的电子迁移率。聚合物。通过将PT-IDTTIC与给体聚合物PM6混合，可以在不牺牲J _SC和FF的情况下以0.52 V的小电压损耗实现高效率的全PSC ，这证明了高性能全PSC的巨大潜力。

更新日期：2020-09-15

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