Nature of Local Charge Carrier Motions in Porphyrin-Based Bulk Heterojunction Films Revealed by Time-Resolved Optical Pump-Terahertz Probe Spectroscopy,Chemistry Letters

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Nature of Local Charge Carrier Motions in Porphyrin-Based Bulk Heterojunction Films Revealed by Time-Resolved Optical Pump-Terahertz Probe Spectroscopy
Chemistry Letters ( IF 1.4 ) Pub Date : 2021-08-18 , DOI: 10.1246/cl.210438
Kaoru Ohta _{1,

2} , Yuichi Hiramatsu ₂ , Mitsuharu Suzuki ₃ , Hiroko Yamada ₃ , Keisuke Tominaga _{1,

2}

Affiliation

Local charge carrier dynamics in diketopyrrolopyrrole (DPP)-tetrabenzoporphyrin (BP)-based bulk heterojunction (BHJ) films are investigated by optical pump-terahertz probe spectroscopy. Here we focus on the effect of the alkyl chain lengths of DPP on the carrier dynamics. In contrast to the large difference in the power conversion efficiency, similar dynamics are observed between C10-DPP-BP and C4-DPP-BP BHJ films. We discuss the origin of similarity in terms of nature of the high frequency response of photo-generated charge carriers.

中文翻译：

时间分辨光泵浦太赫兹探针光谱揭示的基于卟啉的体异质结膜中局部载流子运动的性质

通过光泵浦太赫兹探针光谱研究了基于二酮吡咯并吡咯 (DPP)-四苯并卟啉 (BP) 的本体异质结 (BHJ) 薄膜中的局部电荷载流子动力学。在这里，我们关注 DPP 的烷基链长度对载流子动力学的影响。与功率转换效率的巨大差异相反，在 C10-DPP-BP 和 C4-DPP-BP BHJ 薄膜之间观察到类似的动态。我们根据光生电荷载流子的高频响应的性质讨论了相似性的起源。

更新日期：2021-08-19

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