Quantification of Photophysical Processes in All‐Polymer Bulk Heterojunction Solar Cells,Solar RRL

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Quantification of Photophysical Processes in All‐Polymer Bulk Heterojunction Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2020-04-28 , DOI: 10.1002/solr.202000181
Ahmed H. Balawi ₁ , Zhipeng Kan _{1,

2} , Julien Gorenflot ₁ , Paola Guarracino ₃ , Neha Chaturvedi ₁ , Alberto Privitera ₃ , Shengjian Liu _{1,

4} , Yajun Gao ₁ , Lorenzo Franco ₃ , Pierre Beaujuge ₁ , Frédéric Laquai ₁

Affiliation

All‐polymer solar cells lag behind the state‐of‐the‐art in small molecule nonfullerene acceptor (NFA) bulk heterojunction (BHJ) organic solar cells (OSCs) for reasons still unclear. Herein, the efficiency‐limiting processes in all‐polymer solar cells are investigated using blends of the common donor polymer PBDT‐TS1 with different acceptor polymers, namely P2TPD[2F]T and P2TPDBT[2F]T. Combining data from steady‐state optical spectroscopy and time‐resolved photoluminescence, transient absorption, and time‐delayed collection field experiments, provides not only a concise but also quantitative assessment of the losses due to limited photon absorption, geminate and nongeminate charge carrier recombination, field‐dependent charge generation, and inefficient carrier extraction. Although both systems exhibit a similar charge separation efficiency in the absence of external bias, charge separation is significantly enhanced in P2TPDBT[2F]T‐based blends when biased. Kinetic parameters obtained via pulsed laser spectroscopy are used to reproduce the experimentally measured device current–voltage (J–V) characteristics and indicate that low fill factors originate either from nongeminate recombination competing with charge extraction, or from a pronounced field dependence of charge generation, depending on the acceptor polymer. The methodology presented here is generic and can be used to quantify the loss processes in BHJ OSCs including both all‐polymer and small molecule NFA systems.

中文翻译：

全聚合物本体异质结太阳能电池中光物理过程的量化

由于尚不清楚的原因，全聚合物太阳能电池在小分子非富勒烯受体（NFA）本体异质结（BHJ）有机太阳能电池（OSC）中落后于最新技术。在此，使用普通施主聚合物PBDT-TS1与不同受体聚合物（即P2TPD [2F] T和P2TPDBT [2F] T）的共混物研究了全聚合物太阳能电池的效率限制过程。结合稳态光谱学和时间分辨的光致发光，瞬态吸收和时间延迟的收集场实验的数据，不仅可以简明而且可以定量评估由于有限的光子吸收，成对和非成对的载流子重组而造成的损耗，场相关电荷产生和低效率的载流子提取。尽管在没有外部偏置的情况下，两个系统都表现出相似的电荷分离效率，但在偏置时，基于P2TPDBT [2F] T的共混物的电荷分离显着增强。通过脉冲激光光谱获得的动力学参数可用于重现实验测量的设备电流-电压（J – V）特性，并表明低填充因子源自与电荷提取竞争的非多晶重组或电荷产生的显着场依赖性，这取决于受体聚合物。此处介绍的方法是通用的，可用于量化BHJ OSC（包括全聚合物和小分子NFA系统）中的损失过程。

更新日期：2020-04-28

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