Affiliation:
1. Beijing Key Laboratory of Energy Conversion and Storage Materials College of Chemistry Beijing Normal University Beijing 100875 China
2. College of Textiles & Clothing College of Materials Science and Engineering State Key Laboratory of Bio‐Fibers and Eco‐Textiles Qingdao University Qingdao 266071 China
3. Department of Physics and Applied Optics Beijing Area Major Laboratory Beijing Normal University Beijing 100875 China
Abstract
AbstractThis study underscores the significance of precisely manipulating the morphology of the active layer in organic solar cells (OSCs). By blending polymer donors of D18 with varying molecular weights, a multiscale interpenetrating fiber network structure within the active layer is successfully created. The introduction of 10% low molecular weight D18 (LW‐D18) into high molecular weight D18 (HW‐D18) produces MIX‐D18, which exhibits an extended exciton diffusion distance and orderly molecular stacking. Devices utilizing MIX‐D18 demonstrate superior electron and hole transport, improves exciton dissociation, enhances charge collection efficiency, and reduces trap‐assisted recombination compared to the other two materials. Through the use of the nonfullerene acceptor L8‐BO, a remarkable power conversion efficiency (PCE) of 20.0% is achieved. This methodology, which integrates the favorable attributes of high and low molecular weight polymers, opens a new avenue for enhancing the performance of OSCs.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province