Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
In this work, we demonstrate light soaking stable 8% PbS QDs colloidal solar cells by improving surface state passivation, charge separation, and carrier mobility in QDs films. We find that halide or thiol ligand significantly passivates PbS surface states by a mild anneal, enhancing Voc of solar cells. The conduction bands of QDs films, affected by the surface ligands, are upward shifted by annealing, improving interfacial charge separation and EQE of solar cells. Annealing treatment brings QDs closer, improving carrier mobility in QDs films and thereby enhancing the charge collection yield, as well as fill factor of solar cells. We disclose that QDs films are more effectively passivated by an imidzolium iodide ligand as compared to tetrabutylammonium iodide employed in state-of-the-art PbS colloidal solar cells. The imidazolium cation has a planar structure and dispersed positive charge, facilitating the attack of oleic anions that are replaced by iodide ions. Benefited from advantageously tuning energetic and kinetics of QDs film by new halide ligand and anneal treatment, PbS colloidal solar cells achieve power conversion efficiency of over 8% and display improved light soaking stability under simulated AM1.5G 100 mW cm−2 condition.
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