Abstract
A facile two-step strategy was proposed to modify the ZnO nanoparticles electron transfer layer in inverted ternary blend polymer solar cells (TPSCs) by irradiating the ZnO with UV-ozone (UVO) and then spin-coating the poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctyl-fluorene)] (PFN) interfacial modification layer. The combination of UVO and PFN showed the advantage of simultaneously passivating the defect states of ZnO to reduce the defect-assisted electron-hole recombination, modifying the surface morphology and hydrophilicity of ZnO to improve the interfacial contact with the active layer, and optimizing the electron transfer characteristic of ZnO to enhance the electron extraction from the active layer to cathode. As a result, the champion power conversion efficiency (PCE) of TPSCs with PTB7-Th:PCDTBT:PC70BM as the active layer was increased from 6.80% to 9.61% by 20 min UVO irradiating, and then further increased to 10.87% after the incorporation of an ultrathin PFN inte...
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