NM12.03.04 : The Role of Ligands at the PbS/ZnO Bulk Nano-Heterojunction in Reducing Open-Circuit Voltage Deficit

5:00 PM–7:00 PM Apr 3, 2018 (America - Denver)

PCC North, 300 Level, Exhibit Hall C-E

Grant Murray1 Hal Van Ryswyk1

1, Harvey Mudd College, Claremont, California, United States

A major issue facing colloidal quantum dot (CQD) solar cells is the large open-circuit voltage (Voc) deficit due to sub-bandgap trap states. Recent advances in architecture engineering using bulk nano-heterojunction (BNH) active layers achieved by mixing ZnO and PbS in layer-by-layer processing have dramatically reduced Voc deficit. In addition, high concentration, single-step active-layer deposition has yielded record devices with enhanced ligand exchange and higher packing density that exhibit a sharper bandtail. We explore the role of ligands at the BNH using single-step deposition to further decrease Voc deficit.