关于举行埃尔朗根-纽伦堡大学Eric Tam研究員学术报告的通知

报告题目：Inkjet printed organic solar cells and modules

报 告 人：Eric Kai Cheong Tam （ Friedrich-Alexander University Erlangen-Nürnberg, Germany）

主 持 人：叶轩立 教授

时   间：7月11日（星期二）下午3：00

地   点：北区科技园1号楼发光国重502室

Abstract: Inkjet printing is a very promising approach to fabricate organic photovoltaic devices due to the complete freedom of shape (Fig. 1). However, very few works have demonstrated fully inkjet-printed of organic solar cells (OSC) and until now no work has ever demonstrated fully inkjet-printed organic solar modules. This is due to the process challenges of inkjet printing for functional devices, such as the jetting requirement of the printhead, the reproducibility and uniformity of the inkjet printed layer. In this work, the development of the whole fabrication process for organic electronic devices scalable to industrial inkjet printing is demonstrated. Starting from ink development, we showcase the process conditions modifications and optimization required to achieve good printability and high film uniformity while simultaneously maintaining the device performance. These modifications include (1) reformulation of the coating inks used in other contact based coating methods, (2) separation of printing, drying and annealing, (3) device structure and pattern design to fully utilize the advantage of freeform shapes and patterns of inkjet printing.
As a result of our optimization and process improvement, we have successfully inkjet printed small scale OSC devices and also performed the up-scaling to large area organic solar modules of 1000mm2. We have achieved power conversion efficiencies over 6.5% on small scale opaque (10mm2) devices and over 4.6% on 100mm2 area for semitransparent ones. Furthermore, we have fabricated the world’s first inkjet printed semitransparent organic solar module with efficiencies of 4.3% on 400mm2 area which exhibit a geometric fill factor of 85% and weighted transmittance of 31% (glass deducted). Thanks to recent advances in inkjet printing of highly conductive transparent electrodes (<20Ω/□), this was achieved without any post patterning process and without any visually obstructive current collecting grids.