11.9 Scientists searching for higher performance flexible structures created a diode with organic and inorganic layers. It has excellent mechanical bending properties. Applying a bending strain to the diode actually leads to higher current density(mA/cm2). Metal curvature molds, each having a different radius, were used to apply strain(%). For one demonstration of the phenomena, the data are (Courtesy of Jung-Hun Seo see Jung-Hun Seo et. al. (2013), A multifunction heterojunction formed between pentacene and a single-crystal silicon nanomembrane, Advanced Functional Materials, 23(27), 3398–3403.) Strain(%) Current density(mA/cm2) x y 0.00 3.47 0.25 3.57 0.49 3.68 0.64 3.73 0.80 3.86 1.08 3.99

(a) Obtain the least squares line.

(b) Predict the current density when the strain x = 0.50.