In-depth considerations for better polyelectrolytes as interfacial materials in polymer solar cells
| Autor: | Minji Kang, Youn-Jung Heo, Dong-Yu Kim, Seok-In Na, Seung-Hoon Lee, Yen-Sook Jung, Jun-Seok Yeo, Rira Kang, Sung-Ho Jin |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment business.industry Doping Nanotechnology 02 engineering and technology Conjugated system 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Polyelectrolyte Polymer solar cell Cathode 0104 chemical sciences Active layer law.invention law Side chain Optoelectronics General Materials Science Electrical and Electronic Engineering 0210 nano-technology business Diode |
| Zdroj: | Nano Energy. 21:26-38 |
| ISSN: | 2211-2855 |
| Popis: | We perform a comprehensive study to achieve better polyelectrolytes (PEs) as electron-transport layers (ETLs) in polymer solar cells (PSCs). Three well-known PEs – PFN, PEIE, and WPF – are chosen as model systems and investigated with variations in their backbone structures and the state of the amine functionalities on their side chains. Respectively optimized PSCs using the three PEs exhibit different cell-performances, mainly owing to the diode characteristics of built-in potential and recombination strength. To identify how such deviated device-performances correlate with the structural features of PEs, the modulated interfaces of ITO/PEs and PEs/active layer are studied in detail. It is found that conjugated backbones and larger counter-anions on side chains can promote the modulation of ITO work functions (WFs) and that a large amount of protonated amines on PEs is beneficial for junction properties with a subsequent active layer. Additionally, our results indicate that interfacial dipole and electrical doping between the PE and active layer, in addition to WF modulation of the ITO cathode, are important for device efficiency. Accordingly, with the aid of the molecular features of PEIE, PEIE-PSCs exhibit excellent device efficiency and stability compared with PFN- and WPF-PSCs. In the PTB7-th:PC 71 BM system, a remarkable power-conversion efficiency of 9.97% is achieved with a single PEIE ETL. |
| Databáze: | OpenAIRE |
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