Fig. 1: Design of ultra-flexible ST-OPVs.
a Schematic of the device structure and (b) a photograph of ultra-flexible ST-OPV. c Chemical structures of donor polymer, PTB7-Th, and non-fullerene acceptor, IEICO-4F. d Absorbance spectra of PTB7-Th:IEICO-4F film (purple) and transmittance spectra of glass/parylene/SU-8 (black), PEI/Ag/ZnO (red), PTB7-Th:IEICIO-4F/MoO3/Ag (8 nm)/ (green). e Images captured without obstruction (left) and through parylene (0.5 µm)/SU-8 (0.6 µm)/PEI/Ag (8 nm)/ZnO (50 nm)/PTB7-Th:IEICIO-4F (65 nm)/MoO3 (5 nm)/Ag (8 nm)/MoO3 (30 nm)/parylene (1 µm) (right). f Color coordinates of ST-OPVs with different thicknesses of DMD electrodes under standard D65 illumination in the CIE 1931 color space. g J–V characteristics of ultra-flexible ST-OPVs under solar illumination (1000 W/m2) before and after peeling off from supporting glass. The detailed information regarding the thickness of the metal layer in the D/M/D structure and the transmittance of devices are shown in Fig. S3.
