Quantitative Analysis of Charge Dissociation by Selectively Characterizing Exciton Splitting Efficiencies in Single Component Materials,Israel Journal of Chemistry

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Quantitative Analysis of Charge Dissociation by Selectively Characterizing Exciton Splitting Efficiencies in Single Component Materials
Israel Journal of Chemistry ( IF 2.3 ) Pub Date : 2021-10-13 , DOI: 10.1002/ijch.202100068
Yakun He _{1,

2} , Benedict Hanisch ₁ , Andres Osvet ₁ , Larry Lüer ₁ , Anna Aubele ₃ , Peter Bäuerle ₃ , Weiwei Li ₄ , Ning Li _{1,

5} , Christoph J. Brabec _{1,

5}

Affiliation

Exciton dissociation between donor and acceptor is the decisive process to determine the photovoltaic performance of organic solar cells (OSCs). The rather fast dynamics of photo-induced charge generation in well-optimized bulk heterojunction (BHJ) composites complicate the quantitative analysis of the charge generation efficiency for donor and acceptor units. Herein, we report time-resolved photoluminescence (TRPL) investigations and demonstrate their potential as a quantitative and contactless characterization technique allowing to separately determine the exciton splitting efficiency of donor and acceptor moieties in selected single component materials. We demonstrate that the exciton splitting efficiency for donor or acceptor moieties can be separately adjusted in these materials by post-treatment, while the corresponding BHJ composites undergo excessive phase separation upon external stress. By relating the separate exciton splitting efficiencies to their photovoltaic performance, the limiting factor in corresponding OSCs, either charge generation or recombination, is identified.

中文翻译：

通过选择性表征单组分材料中的激子分裂效率对电荷解离进行定量分析

供体和受体之间的激子解离是确定有机太阳能电池（OSC）光伏性能的决定性过程。在优化良好的体异质结 (BHJ) 复合材料中，光致电荷产生的相当快的动力学使供体和受体单元的电荷产生效率的定量分析变得复杂。在这里，我们报告了时间分辨光致发光 (TRPL) 研究，并证明了它们作为一种定量和非接触式表征技术的潜力，可以分别确定所选单组分材料中供体和受体部分的激子分裂效率。我们证明了供体或受体部分的激子分裂效率可以通过后处理在这些材料中单独调整，而相应的 BHJ 复合材料在外部应力下会发生过度的相分离。通过将单独的激子分裂效率与其光伏性能相关联，确定了相应 OSC 中的限制因素，即电荷产生或复合。

更新日期：2021-10-13

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