Novel small-molecule zwitterionic electrolyte with ultralow work function as cathode modifier for inverted polymer solar cells
| Autor: | Xianjie Liu, Yan-Qing Li, Zhiquan Wang, Slawomir Braun, Yue-Xing Zhang, Qinye Bao, Mats Fahlman, Bo Li, Chun-Gang Duan, Jian-Xin Tang, Xuewen Guo, Junfeng Fang |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Organic solar cell 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Polymer solar cell Cathode 0104 chemical sciences Electronic Optical and Magnetic Materials law.invention Biomaterials Organic semiconductor Chemical engineering law Electrode Solar cell Materials Chemistry Work function Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Organic Electronics. 59:15-20 |
| ISSN: | 1566-1199 |
| DOI: | 10.1016/j.orgel.2018.04.036 |
| Popis: | Interfacial compatibility between the electrode and organic semiconductor plays a critical role in controlling the charge transport and hence efficiency of organic solar cell. Here, we introduce a novel small-molecule zwitterionic electrolyte (S1) combined with ZnO as electron transporting interlayer employed for the inverted PTB7:PC71BM bulk heterojunction solar cell. The resulting device with the S1/ZnO stacked interlayer achieves a high PCE of 8.59%, obtaining a 16.2% improvement over the control device performance of 7.4% without the S1 attributed to the significant increased short-circuit current density and fill factor. The interfacial properties are investigated. It is found that the S1/ZnO interlayer possess an ultralow work function of 3.6 eV, which originates from the interfacial double dipole step induced by the zwitterionic side chain electrostatic realignment at interface. The S1/ZnO interlayer exhibits the excellent charge extraction ability, suppresses the charge recombination loss and decreases the series resistance at the active layer/electrode contact. |
| Databáze: | OpenAIRE |
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