Roll to roll compatible fabrication of inverted organic solar cells with a self-organized charge selective cathode interfacial layer
| Autor: | Wan-Yi Tan, Hong Zhang, Mathieu Turbiez, Erdmann Spiecker, Lili Ke, Ning Li, Yong Cao, Xu-Hui Zhu, Christoph J. Brabec, Tayebeh Ameri, Stefanie Fladischer |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Fabrication Organic solar cell Band gap Technische Fakultät Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Roll-to-roll processing law.invention law General Materials Science Renewable Energy Sustainability and the Environment business.industry General Chemistry 021001 nanoscience & nanotechnology Surface energy Cathode 0104 chemical sciences Active layer Optoelectronics 0210 nano-technology business ddc:600 Layer (electronics) |
| Zdroj: | Journal of Materials Chemistry A. 4:5032-5038 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c6ta00391e |
| Popis: | We successfully demonstrate a simple approach to printing efficient, inverted organic solar cells (OSCs) with a self-organized charge selective cathode interface layer based on the small-molecule Phen-NaDPO. Different from previous studies, Phen-NaDPO molecules were blended into a polymer/fullerene blend, comprising a low bandgap diketopyrrolopyrrole–quinquethiophene alternating copolymer pDPP5T-2 and phenyl-C61-butyric acid methyl ester (PC61BM), and processed by doctor blading in air. We observed a spontaneous, surface energy driven migration of Phen-NaDPO towards the ZnO interface and a subsequent formation of electron selective and barrier free extraction contacts. In the presence of 0.5 wt% Phen-NaDPO, a PCE of 5.4% was achieved for the inverted device based on an ITO/ZnO cathode. Notably, the photovoltaic performances remained at the same level with increasing the Phen-NaDPO concentration in the active layer from 0.25 to 1 wt%. Furthermore, this approach could be proven to effectively work with other cathodes such as bare ITO and ITO/AZO. The self-organization of Phen-NaDPO through spontaneous vertical phase separation is mainly attributed to its high surface energy and strong interaction with the cathode material. The present results highlight that a self-organized cathode interfacial material processed from a “ternary” active layer is fully compatible with the requirements for roll-to-roll fabrication of inverted organic solar cells. |
| Databáze: | OpenAIRE |
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