All-polymer solar cells have shown great potential as flexible and portable power generators. These devices should offer good mechanical endurance with high power-conversion efficiency for viability in commercial applications. In this work, we develop highly efficient and mechanically robust all-polymer solar cells that are based on the PBDTTTPD polymer donor and the P(NDI2HD-T) polymer acceptor. These systems exhibit high power-conversion efficiency of 6.64%. Also, the proposed all-polymer solar cells have even better performance than the control polymer-fullerene devices with phenyl-C61-butyric acid methyl ester (PCBM) as the electron acceptor (6.12%). More importantly, our all-polymer solar cells exhibit dramatically enhanced strength and flexibility compared with polymer/PCBM devices, with 60- and 470-fold improvements in elongation at break and toughness, respectively. The superior mechanical properties of all-polymer solar cells afford greater tolerance to severe deformations than conventional polymer-fullerene solar cells, making them much better candidates for applications in flexible and portable devices.

Nature Communications 6, Article number: 8547 doi:10.1038/ncomms9547
Received 11 May 2015 Accepted 03 September 2015 Published 09 October 2015

http://www.nature.com/ncomms/2015/151009/ncomms9547/full/ncomms9547.html

全聚合物太阳能电池作为柔性和可移动发电器具有很大潜力。为能满足商业应用，这类电池需要有良好的机械寿命和高能量转化效率。Kim等人开发了一种基于PBDTTTPD 聚合物给体和P（NDI2HD-T）聚合物受体的高效全聚合物太阳能电池。电池展示出 6.64% 的能量转化效率，比基于聚合物-富勒烯体系的电池效率（6.12%）还高。更重要的是，这种全聚合物电池在强度和柔性方面也具有极大的提升，因此也更适合用于柔性、可移动设备。