Solar cells exhibiting gradients of composition between the donor and acceptor molecules forming the active layer of the solar cell. The NANOPTO group at ICMAB-CSIC use it to make polymer/polymer composition gradients for high throughput screening of solar cells.
Reference publications: Sanchez–Diaz et al, Adv. Elect. Mat. 4, 1700477 (2018); Rodríguez-Martínez et al, Advanced Energy Materials, 10, 2001308 (2020) Harillo-Baños et al., Advanced Energy Materials, 10, 1902417 (2020).