Fig. 4From: The Fabrication of Ordered Bulk Heterojunction Solar Cell by Nanoimprinting Lithography Method Using Patterned Silk Fibroin Mold at Room TemperatureThe two-dimensional (2D) GIWAXD images of P3HT film. a The 2D GIWAXD image of unimprinted P3HT film; b the 2D GIWAXD image of P3HT nanograting film with grating direction parallel to the direction of incident X-rays; c the 2D GIWAXD image of P3HT nanograting film with grating direction perpendicular to the direction of incident X-raysBack to article page