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/cm² at -5 V. The OPD's detectivity is increased from 1.66 × 10¹¹ Jones to 3.34 × 10¹² 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.

在这项工作中，我们提出并支持1，8-二碘辛烷（DIO）作为加工助剂的基础，该加工助剂基于[6,5]的喷涂混合物制备溶液加工的近红外（NIR）有机光电二极管（OPD）。 6]苯基-C70-丁酸甲酯（PC ₇₀ BM）和聚[（2,5-双（2-己基癸基）-2,3,5,6-四氢-3,6-二氧-吡咯并[3， 4 - c ]吡咯-1,4-二基）-alt-（[[2,2'：5'，2''-叔硫代烯] -5,5''-二基）]（PDPP3T）。透射电子显微镜（TEM）分析表明，使用DIO可以改善体异质结（BHJ）层中的供体-受体界面。除了增强电子/空穴传输途径以提高效率外，它还大大降低了喷涂层的粗糙度。外部量子效率（EQE）在900nm的增加至35％，暗电流相比下降一个数量级到参考低至20 nA /厘米²在-5伏。OPD的探测灵敏度是从1.66提高×10 ¹¹琼斯至3.34×10 ¹²琼斯和线性响应得到改善。这项工作的主要重点是对生成的层和器件进行全面的形态和电光表征。