Addition of 2D Ti_3C_2T_x to Enhance Photocurrent in Diodes for High-Efficiency Organic Solar Cells

摘要

Solution-processed 2D Ti_3C_2T_x nanosheets are incorporated into the active layer of organic solar cells (OSCs) as a third component to obtain an enhancement of the photovoltaic device performance. The power conversion efficiency (PCE) of the devices is boosted from 9.34% to 10.72% for the PBDB-T:ITIC blend and from 14.64% to 16.25% for the PM6:Y6 blend after adding 2D Ti_3C_2T_x nanosheets. The light scattering of the 2D flakes in Ti_3C_2T_x nanosheets not only increases the short-circuit current density (J_(SC)) but also improves the carrier dissociation and transfer efficiency in devices, thus leading to reduced bimolecular recombination. Furthermore, Ti_3C_2T_x with appropriate content has little effect on the interpenetrating network morphology and instead provides an additional pathway for charge transport in photoactive layers. Herein, a potential direction for the application of 2D Ti_3C_2T_x materials in the field of OSCs is provided.