Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.
Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA.
Science. 2017 Jan 6;355(6320):59-64. doi: 10.1126/science.aah4496.
Soft and conformable wearable electronics require stretchable semiconductors, but existing ones typically sacrifice charge transport mobility to achieve stretchability. We explore a concept based on the nanoconfinement of polymers to substantially improve the stretchability of polymer semiconductors, without affecting charge transport mobility. The increased polymer chain dynamics under nanoconfinement significantly reduces the modulus of the conjugated polymer and largely delays the onset of crack formation under strain. As a result, our fabricated semiconducting film can be stretched up to 100% strain without affecting mobility, retaining values comparable to that of amorphous silicon. The fully stretchable transistors exhibit high biaxial stretchability with minimal change in on current even when poked with a sharp object. We demonstrate a skinlike finger-wearable driver for a light-emitting diode.
柔软且贴合的可穿戴电子产品需要可拉伸的半导体，但现有的半导体通常为了实现可拉伸性而牺牲电荷传输迁移率。我们探索了一种基于聚合物纳米限制的概念，可以在不影响电荷传输迁移率的情况下，极大地提高聚合物半导体的拉伸性。纳米限制下聚合物链的动态性显著增加，从而显著降低了共轭聚合物的模量，并在应变下大大延迟了裂纹形成的开始。因此，我们制造的半导体薄膜可以拉伸至 100%的应变而不会影响迁移率，保持与非晶硅相当的值。完全可拉伸的晶体管具有很高的双轴拉伸性，即使被尖锐物体戳刺，导通电流的变化也很小。我们展示了一种用于发光二极管的类似皮肤的手指可穿戴驱动器。
