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Wide-Linear-Dynamic-Range Polymer Photodiode with a New Benzo[1,2-b:4,5-b′]dithiophene-Copolymer: The Role of Crystalline Orientation
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-03-13 , DOI: 10.1021/acs.chemmater.0c00347 Hyunki Ko 1 , Sungmin Park 2 , Hae Jung Son 2 , Dae Sung Chung 3
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-03-13 , DOI: 10.1021/acs.chemmater.0c00347 Hyunki Ko 1 , Sungmin Park 2 , Hae Jung Son 2 , Dae Sung Chung 3
Affiliation
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A new polymeric semiconductor, which can effectively extend linear dynamic ranges (LDRs) of organic photodiodes (OPDs), was developed. Copolymers based on alkylthio-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT) are synthesized in conjunction with fluorinated terthiophene (BDT-Th-3T) or alkylterthiophene (BDT-Th-3AT). When deposited onto an ITO/polyethylenimine ethoxylated (PEIE) substrate, both copolymer thin films render apparent face-on orientations as indicated in the two-dimensional grazing incidence X-ray diffraction (2D-GIXD) results, and especially among them, BDT-Th-3T thin films show much improved crystalline properties. This is because the molecular structure of BDT-Th-3T shows a higher molecular planarity induced by noncovalent intramolecular interaction and small steric hindrance, which are proved from UV–vis-NIR absorption and Raman spectroscopy studies, respectively. BDT-Th-3T polymers effectively maintain their crystalline properties when blended with nonfullerene acceptors and form a bulk heterojunction (BHJ) of a percolating network composed of face-on-oriented donors and acceptors, which is favorable for charge carrier transports in a vertical direction of the device. As a result, the optimized OPD shows a high specific detectivity over 1013 Jones and an unprecedentedly wide LDR of 232 dB. It is demonstrated that the wide LDR is originated from the high charge transporting property of the polymer, which induces a high saturation photocurrent of BHJ.
中文翻译：
具有新型苯并[1,2- b：4,5 - b ']二噻吩共聚物的宽线性动态范围聚合物光电二极管：晶体取向的作用
开发了一种可以有效扩展有机光电二极管（OPD）的线性动态范围（LDR）的新型聚合物半导体。基于烷硫基取代的苯并[1,2- b：4,5- b的共聚物′]二噻吩（BDT）与氟化对噻吩（BDT-Th-3T）或烷基对噻吩（BDT-Th-3AT）一起合成。当沉积到ITO /聚乙烯亚胺乙氧基化（PEIE）衬底上时，两种共聚物薄膜都呈现出明显的面朝上取向，如二维掠入射X射线衍射（2D-GIXD）结果所示，尤其是其中的BDT- Th-3T薄膜显示出大大改善的结晶性能。这是因为BDT-Th-3T的分子结构由于非共价分子内相互作用和较小的位阻而表现出较高的分子平面性，这分别由UV-vis-NIR吸收和拉曼光谱研究证明。BDT-Th-3T聚合物与非富勒烯受体共混时可有效保持其晶体性质，并形成由面对面的供体和受体组成的渗流网络的本体异质结（BHJ），这有利于垂直方向上的电荷载流子传输设备的 结果，优化的OPD在超过10的范围内显示出较高的比探测率13 Jones和前所未有的宽LDR 232 dB。证明了宽的LDR源自聚合物的高电荷传输性质，其引起BHJ的高饱和光电流。
更新日期：2020-04-23
中文翻译：
具有新型苯并[1,2- b：4,5 - b ']二噻吩共聚物的宽线性动态范围聚合物光电二极管：晶体取向的作用
开发了一种可以有效扩展有机光电二极管（OPD）的线性动态范围（LDR）的新型聚合物半导体。基于烷硫基取代的苯并[1,2- b：4,5- b的共聚物′]二噻吩（BDT）与氟化对噻吩（BDT-Th-3T）或烷基对噻吩（BDT-Th-3AT）一起合成。当沉积到ITO /聚乙烯亚胺乙氧基化（PEIE）衬底上时，两种共聚物薄膜都呈现出明显的面朝上取向，如二维掠入射X射线衍射（2D-GIXD）结果所示，尤其是其中的BDT- Th-3T薄膜显示出大大改善的结晶性能。这是因为BDT-Th-3T的分子结构由于非共价分子内相互作用和较小的位阻而表现出较高的分子平面性，这分别由UV-vis-NIR吸收和拉曼光谱研究证明。BDT-Th-3T聚合物与非富勒烯受体共混时可有效保持其晶体性质，并形成由面对面的供体和受体组成的渗流网络的本体异质结（BHJ），这有利于垂直方向上的电荷载流子传输设备的 结果，优化的OPD在超过10的范围内显示出较高的比探测率13 Jones和前所未有的宽LDR 232 dB。证明了宽的LDR源自聚合物的高电荷传输性质，其引起BHJ的高饱和光电流。
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