Improving spray coated organic photodetectors performance by using 1,8-diiodooctane as processing additive
Improving spray coated organic photodetectors performance by using 1,8-diiodooctane as processing additive
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DOI：
10.1016/j.orgel.2017.12.022
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发表时间：
2018-03-01
影响因子：
3.2
通讯作者：
Tedde, Sandro F.
中科院分区：
文献类型：
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作者：
Benavides, Cindy Montenegro;Rechberger, Stefanie;Tedde, Sandro F.
在这项工作中，我们提出并支持了1,8-二碘辛烷（DIO）作为加工添加剂在制备基于[6,6]苯基- c70 -丁酸甲酯（PC70BM）和聚[（2,5-双（2-己基癸基）-2,3,5,6-四氢-3,6-二氧基-吡罗-1,4-二基）-alt-（[2,2':5', 2' -三噻吩]-5,5' -二基）]（PDPP3T）的溶液处理近红外（NIR）有机光电二极管（OPDs）的积极影响。透射电镜（TEM）分析表明，DIO的使用改善了体异质结（BHJ）层中的施主-受体界面。除了增强电子/空穴传输路径，从而提高效率外，它还显著降低了喷涂层的粗糙度。外部量子效率（EQE）在900 nm处提高到35%，暗电流在-5 V时比参考值降低了一个数量级，降至20 nA/cm(2)。OPD的检出率由1.66x10(11) Jones提高到3.34x10(12) Jones，线性响应得到改善。对生成的层和器件进行全面的形态学和电光表征是本工作的主要重点。
In this work, we present and support the positive influence of 1,8-diiodooctane (DIO) as processing additive for the fabrication of solution processed near infrared (NIR) organic photodiodes (OPDs) based on the spray-coated blend of [6,6] phenyl-C70-butyric acid methyl ester (PC70BM) and poly[(2,5-bis(2-hexyldecyl)-2,3,5,6-tetrahydro-3,6-diox-opyrrolo[3,4-c] pyrrole-1,4-diyl)-alt-([2,2':5', 2''- terthioph-ene]-5,5''- diyl)] (PDPP3T). Transmission electron microscopy (TEM) analysis show that the use of DIO improves donor- acceptor interfaces in the bulk heterojunction (BHJ) layer. Besides the enhancement of electron/hole transport pathways that leads to higher efficiencies, it reduces significantly the roughness of spray coated layers. The External Quantum Efficiency (EQE) is increased up to 35% at 900 nm and the dark current is decreased one order of magnitude in comparison to the reference down to 20 nA/cm(2) at -5 V. The OPD's detectivity is increased from 1.66x10(11) Jones to 3.34x10(12) Jones and the linearity response is improved. A comprehensive morphological and electro-optical characterization of the generated layers and devices is the main focus of this work.