Highly conductive and transparent carbon nanotube-based electrodes for ultrathin and stretchable organic solar cells

Fan Qingxia^{1, 3}, Zhang Qiang^{1, 3}, Zhou Wenbin¹, Yang Feng^{1, 3}, Zhang Nan¹, Xiao Shiqi^{1, 3}, Gu Xiaogang^{1, 3}, Xiao Zhuojian^{1, 3}, Chen Huiliang^{1, 3}, Wang Yanchun^{1, 2, 3}, Liu Huaping^{1, 2, 3}, Zhou Weiya^{1, 2, 3, †}

(color online) (a) Photographs of the solar cell attached on a pre-strained elastomer under various compressive deformations, the scale bar is 5 mm. (b) and (c) SEM images of solar cell under 50% compressive strain. Inset in panel (c) is the SEM image of solar cell after cyclic test. (d) Normalized photovoltaic characteristics of OSC under various compressive states and (e) under cyclic compressing and stretching with a compressive deformation of 50%. Photovoltaic characteristics tests of OSC were performed under fully extended state at each cycle.