The team of Professor Chen Yongsheng of the School of Chemistry of Nankai University has successfully prepared a silver nanowire flexible transparent electrode with high conductivity, high light transmission and low surface roughness, which is used to construct a flexible organic solar cell. The photoelectric conversion efficiency has refreshed the flexibility reported in the literature The highest record of photoelectric conversion efficiency of organic / polymer solar cells. This achievement makes the efficient and flexible organic solar cells one step closer to industrialization.
On the 4th, the international top academic journal "Nature · Electronics" introduced their breakthrough progress in the field of flexible transparent electrodes and flexible organic solar cells.
Flexible electronic devices, especially optoelectronic devices based on organic materials, are a major trend in the future development of electronic devices and have huge application prospects. "Among them, obtaining high-performance flexible transparent electrodes is a prerequisite for achieving efficient and flexible organic optoelectronic devices, and is also a core problem in this field. However, how to obtain high conductivity, high light transmission, low surface roughness and simple preparation methods, The green flexible transparent electrode is still a huge challenge. "Chen Yongsheng said.
Due to the lack of the above-mentioned high-performance flexible transparent electrodes, the performance of current flexible organic optoelectronic devices still lags far behind corresponding rigid devices. The flexible transparent electrode is usually prepared by a dry method or a solution treatment process. Compared with the dry method, the solution treatment method has the advantages of low cost, large-scale "roll-to-roll" printing preparation, and huge development potential.
Chen Yongsheng's team used a polymer electrolyte to prepare silver nanowire flexible transparent electrodes with a "mesh-like" structure in a one-step process. The flexible transparent electrode achieves excellent performance, low surface roughness, and has excellent mechanical properties and thermal stability, and the preparation method is simple and green.
In order to prove its practicability in organic optoelectronic devices, Chen Yongsheng team prepared a flexible organic solar cell based on the flexible transparent electrode. Research shows that the electrode can be applied to different types of active materials and single junction and stacked photovoltaic devices. The fabricated flexible photovoltaic device has comparable performance to devices using commercial ITO glass electrodes. Single-junction and stacked flexible organic solar cells achieved 13.1% and 16.5% photoelectric conversion efficiency, respectively, and showed excellent mechanical properties. After continuous bending 1000 times, the device can still maintain more than 95% of the initial efficiency.
"In addition to organic solar cells, this low-cost high-performance flexible transparent electrode will also have great application potential in other flexible electronics such as organic light-emitting diodes, transistors, sensors and other fields." Chen Yongsheng said.
The research was supported by relevant science and technology projects of the Ministry of Science and Technology and the National Natural Science Foundation of China.
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